html table no longer supported
1
As others before I used yql to get data from a website. The website is in xml format.
I am doing this to build a web data connector in Tableau to connect to xmldata and I got my code from here: https://github.com/tableau/webdataconnector/blob/v1.1.0/Examples/xmlConnector.html
As recommended on here: YQL: html table is no longer supported I tried htmlstring and added the reference to the community environment.
// try to use yql as a proxy
function _yqlProxyAjaxRequest2(url, successCallback){
var yqlQueryBase = "http://query.yahooapis.com/v1/public/yql?q=";
var query = "select * from htmlstring where url='" + url + "'";
var restOfQueryString = "&format=xml" ;
var yqlUrl = yqlQueryBase + encodeURIComponent(query) + restOfQueryString + "&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys";
_ajaxRequestHelper(url, successCallback, yqlUrl, _giveUpOnUrl9);
}
function _giveUpOnUrl9(url, successCallback) {
tableau.abortWithError("Could not load url: " + url);
}
However, I still got the message: Html table no longer supported.
As I don't know much about yql, I tried to work with xmlHttpRequestinstead, but Tableau ended up processing the request for ages and nothing happened.
Here my attempt to find another solution and avoid the yql thingy:
function _retrieveXmlData(retrieveDataCallback) {
if (!window.cachedTableData) {
var conData = JSON.parse(tableau.connectionData);
var xmlString = conData.xmlString;
if (conData.xmlUrl) {
var successCallback = function(data) {
window.cachedTableData = _xmlToTable(data);
retrieveDataCallback(window.cachedTableData);
};
//INSTEAD OF THIS:
//_basicAjaxRequest1(conData.xmlUrl, successCallback);
//USE NOT YQL BUT XMLHTTPREQUEST:
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
myFunction(this);
}
};
xhttp.open('GET', 'https://www.w3schools.com/xml/cd_catalog.xml', true);
xhttp.send();
return;
}
try {
var xmlDoc = $.parseXML(conData.xmlString);
window.cachedTableData = _xmlToTable(xmlDoc);
}
catch (e) {
tableau.abortWithError("unable to parse xml data");
return;
}
}
retrieveDataCallback(window.cachedTableData);
}
Does anyone have an idea how to get YQL work or comment on my approach trying to avoid it?
Thank you very much!
For reference, if there is any Tableau user that wants to test it on Tableau, here is my full code:
<html>
<head>
<title>XML Connector</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js" type="text/javascript"></script>
<script src="https://connectors.tableau.com/libs/tableauwdc-1.1.1.js" type="text/javascript"></script>
<script type="text/javascript">
(function() {
var myConnector = tableau.makeConnector();
myConnector.init = function () {
tableau.connectionName = 'XML data';
tableau.initCallback();
};
myConnector.getColumnHeaders = function() {
_retrieveXmlData(function (tableData) {
var headers = tableData.headers;
var fieldNames = ;
var fieldTypes = ;
for (var fieldName in headers) {
if (headers.hasOwnProperty(fieldName)) {
fieldNames.push(fieldName);
fieldTypes.push(headers[fieldName]);
}
}
tableau.headersCallback(fieldNames, fieldTypes); // tell tableau about the fields and their types
});
}
myConnector.getTableData = function (lastRecordToken) {
_retrieveXmlData(function (tableData) {
var rowData = tableData.rowData;
tableau.dataCallback(rowData, rowData.length.toString(), false);
});
};
tableau.registerConnector(myConnector);
})();
function _retrieveXmlData(retrieveDataCallback) {
if (!window.cachedTableData) {
var conData = JSON.parse(tableau.connectionData);
var xmlString = conData.xmlString;
if (conData.xmlUrl) {
var successCallback = function(data) {
window.cachedTableData = _xmlToTable(data);
retrieveDataCallback(window.cachedTableData);
};
//_basicAjaxRequest1(conData.xmlUrl, successCallback);
//here try another approach not using yql but xmlHttpRequest?
//try xml dom to get url (xml http request)
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
myFunction(this);
}
};
xhttp.open('GET', 'https://www.w3schools.com/xml/cd_catalog.xml', true);
xhttp.send();
return;
}
try {
var xmlDoc = $.parseXML(conData.xmlString);
window.cachedTableData = _xmlToTable(xmlDoc);
}
catch (e) {
tableau.abortWithError("unable to parse xml data");
return;
}
}
retrieveDataCallback(window.cachedTableData);
}
function myFunction(xml) {
var xmlDoc = xml.responseXML;
window.cachedTableData = _xmlToTable(xmlDoc);
}
// There are a lot of ways to handle URLS. Sometimes we'll need workarounds for CORS. These
// methods chain together a series of attempts to get the data at the given url
function _ajaxRequestHelper(url, successCallback, conUrl, nextFunction,
specialSuccessCallback){
specialSuccessCallback = specialSuccessCallback || successCallback;
var xhr = $.ajax({
url: conUrl,
dataType: 'xml',
success: specialSuccessCallback,
error: function()
{
nextFunction(url, successCallback);
}
});
}
// try the straightforward request
function _basicAjaxRequest1(url, successCallback){
_ajaxRequestHelper(url, successCallback, url, _yqlProxyAjaxRequest2);
}
// try to use yql as a proxy
function _yqlProxyAjaxRequest2(url, successCallback){
var yqlQueryBase = "http://query.yahooapis.com/v1/public/yql?q=";
var query = "select * from htmlstring where url='" + url + "'";
var restOfQueryString = "&format=xml" ;
var yqlUrl = yqlQueryBase + encodeURIComponent(query) + restOfQueryString + "&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys";
_ajaxRequestHelper(url, successCallback, yqlUrl, _giveUpOnUrl9);
}
function _giveUpOnUrl9(url, successCallback) {
tableau.abortWithError("Could not load url: " + url);
}
// Takes a hierarchical xml document and tries to turn it into a table
// Returns an object with headers and the row level data
function _xmlToTable(xmlDocument) {
var rowData = _flattenData(xmlDocument);
var headers = _extractHeaders(rowData);
return {"headers":headers, "rowData":rowData};
}
// Given an object:
// - finds the longest array in the xml
// - flattens each element in that array so it is a single element with many properties
// If there is no array that is a descendent of the original object, this wraps
function _flattenData(xmlDocument) {
// first find the longest array
var longestArray = _findLongestArray(xmlDocument, xmlDocument);
if (!longestArray || longestArray.length == 0) {
// if no array found, just wrap the entire object blob in an array
longestArray = [objectBlob];
}
toRet = ;
for (var ii = 0; ii < longestArray.childNodes.length; ++ii) {
toRet[ii] = _flattenObject(longestArray.childNodes[ii]);
}
return toRet;
}
// Given an element with hierarchical properties, flattens it so all the properties
// sit on the base element.
function _flattenObject(xmlElt) {
var toRet = {};
if (xmlElt.attributes) {
for (var attributeNum = 0; attributeNum < xmlElt.attributes.length; ++attributeNum) {
var attribute = xmlElt.attributes[attributeNum];
toRet[attribute.nodeName] = attribute.nodeValue;
}
}
var children = xmlElt.childNodes;
if (!children || !children.length) {
if (xmlElt.textContent) {
toRet.text = xmlElt.textContent.trim();
}
} else {
for (var childNum = 0; childNum < children.length; ++childNum) {
var child = xmlElt.childNodes[childNum];
var childName = child.nodeName;
var subObj = _flattenObject(child);
for (var k in subObj) {
if (subObj.hasOwnProperty(k)) {
toRet[childName + '_' + k] = subObj[k];
}
}
}
}
return toRet;
}
// Finds the longest array that is a descendent of the given object
function _findLongestArray(xmlElement, bestSoFar) {
var children = xmlElement.childNodes;
if (children && children.length) {
if (children.length > bestSoFar.childNodes.length) {
bestSoFar = xmlElement;
}
for (var childNum in children) {
var subBest = _findLongestArray(children[childNum], bestSoFar);
if (subBest.childNodes.length > bestSoFar.childNodes.length) {
bestSoFar = subBest;
}
}
}
return bestSoFar;
}
// Given an array of js objects, returns a map from data column name to data type
function _extractHeaders(rowData) {
var toRet = {};
for (var row = 0; row < rowData.length; ++row) {
var rowLine = rowData[row];
for (var key in rowLine) {
if (rowLine.hasOwnProperty(key)) {
if (!(key in toRet)) {
toRet[key] = _determineType(rowLine[key]);
}
}
}
}
return toRet;
}
// Given a primitive, tries to make a guess at the data type of the input
function _determineType(primitive) {
// possible types: 'float', 'date', 'datetime', 'bool', 'string', 'int'
if (parseInt(primitive) == primitive) return 'int';
if (parseFloat(primitive) == primitive) return 'float';
if (isFinite(new Date(primitive).getTime())) return 'datetime';
return 'string';
}
function _submitXMLToTableau(xmlString, xmlUrl) {
var conData = {"xmlString" : xmlString, "xmlUrl": xmlUrl};
tableau.connectionData = JSON.stringify(conData);
tableau.submit();
}
function _buildConnectionUrl(url) {
// var yqlQueryBase = "http://query.yahooapis.com/v1/public/yql?q=";
// var query = "select * from html where url='" + url + "'";
// var restOfQueryString = "&format=xml";
// var yqlUrl = yqlQueryBase + encodeURIComponent(query) + restOfQueryString;
// return yqlUrl;
return url;
}
$(document).ready(function(){
var cancel = function (e) {
e.stopPropagation();
e.preventDefault();
}
$("#inputForm").submit(function(e) { // This event fires when a button is clicked
// Since we use a form for input, make sure to stop the default form behavior
cancel(e);
var xmlString = $('textarea[name=xmlText]')[0].value.trim();
var xmlUrl = $('input[name=xmlUrl]')[0].value.trim();
_submitXMLToTableau(xmlString, xmlUrl);
});
var ddHandler = $("#dragandrophandler");
ddHandler.on('dragenter', function (e)
{
cancel(e);
$(this).css('border', '2px solid #0B85A1');
}).on('dragover', cancel)
.on('drop', function (e)
{
$(this).css('border', '2px dashed #0B85A1');
e.preventDefault();
var files = e.originalEvent.dataTransfer.files;
var file = files[0];
var reader = new FileReader();
reader.onload = function(e) { _submitXMLToTableau(reader.result); };
reader.readAsText(file);
});
$(document).on('dragenter', cancel)
.on('drop', cancel)
.on('dragover', function (e)
{
cancel(e);
ddHandler.css('border', '2px dashed #0B85A1');
});
});
</script>
<style>
#dragandrophandler {
border:1px dashed #999;
width:300px;
color:#333;
text-align:left;vertical-align:middle;
padding:10px 10px 10 10px;
margin:10px;
font-size:150%;
}
</style>
</head>
<body>
<form id="inputForm" action="">
Enter a URL for XML data:
<input type="text" name="xmlUrl" size="50" />
<br>
<div id="dragandrophandler">Or Drag & Drop Files Here</div>
<br>
Or paste XML data below
<br>
<textarea name="xmlText" rows="10" cols="70"/></textarea>
<input type="submit" value="Submit">
</form>
javascript xml xmlhttprequest tableau yql
edited Dec 28 '18 at 16:23
Flimzy
37.7k96497
asked Dec 28 '18 at 16:22
VeeVee
368
add a comment |
1
As others before I used yql to get data from a website. The website is in xml format.
I am doing this to build a web data connector in Tableau to connect to xmldata and I got my code from here: https://github.com/tableau/webdataconnector/blob/v1.1.0/Examples/xmlConnector.html
As recommended on here: YQL: html table is no longer supported I tried htmlstring and added the reference to the community environment.
// try to use yql as a proxy
function _yqlProxyAjaxRequest2(url, successCallback){
var yqlQueryBase = "http://query.yahooapis.com/v1/public/yql?q=";
var query = "select * from htmlstring where url='" + url + "'";
var restOfQueryString = "&format=xml" ;
var yqlUrl = yqlQueryBase + encodeURIComponent(query) + restOfQueryString + "&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys";
_ajaxRequestHelper(url, successCallback, yqlUrl, _giveUpOnUrl9);
}
function _giveUpOnUrl9(url, successCallback) {
tableau.abortWithError("Could not load url: " + url);
}
However, I still got the message: Html table no longer supported.
As I don't know much about yql, I tried to work with xmlHttpRequestinstead, but Tableau ended up processing the request for ages and nothing happened.
Here my attempt to find another solution and avoid the yql thingy:
function _retrieveXmlData(retrieveDataCallback) {
if (!window.cachedTableData) {
var conData = JSON.parse(tableau.connectionData);
var xmlString = conData.xmlString;
if (conData.xmlUrl) {
var successCallback = function(data) {
window.cachedTableData = _xmlToTable(data);
retrieveDataCallback(window.cachedTableData);
};
//INSTEAD OF THIS:
//_basicAjaxRequest1(conData.xmlUrl, successCallback);
//USE NOT YQL BUT XMLHTTPREQUEST:
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
myFunction(this);
}
};
xhttp.open('GET', 'https://www.w3schools.com/xml/cd_catalog.xml', true);
xhttp.send();
return;
}
try {
var xmlDoc = $.parseXML(conData.xmlString);
window.cachedTableData = _xmlToTable(xmlDoc);
}
catch (e) {
tableau.abortWithError("unable to parse xml data");
return;
}
}
retrieveDataCallback(window.cachedTableData);
}
Does anyone have an idea how to get YQL work or comment on my approach trying to avoid it?
Thank you very much!
For reference, if there is any Tableau user that wants to test it on Tableau, here is my full code:
<html>
<head>
<title>XML Connector</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js" type="text/javascript"></script>
<script src="https://connectors.tableau.com/libs/tableauwdc-1.1.1.js" type="text/javascript"></script>
<script type="text/javascript">
(function() {
var myConnector = tableau.makeConnector();
myConnector.init = function () {
tableau.connectionName = 'XML data';
tableau.initCallback();
};
myConnector.getColumnHeaders = function() {
_retrieveXmlData(function (tableData) {
var headers = tableData.headers;
var fieldNames = ;
var fieldTypes = ;
for (var fieldName in headers) {
if (headers.hasOwnProperty(fieldName)) {
fieldNames.push(fieldName);
fieldTypes.push(headers[fieldName]);
}
}
tableau.headersCallback(fieldNames, fieldTypes); // tell tableau about the fields and their types
});
}
myConnector.getTableData = function (lastRecordToken) {
_retrieveXmlData(function (tableData) {
var rowData = tableData.rowData;
tableau.dataCallback(rowData, rowData.length.toString(), false);
});
};
tableau.registerConnector(myConnector);
})();
function _retrieveXmlData(retrieveDataCallback) {
if (!window.cachedTableData) {
var conData = JSON.parse(tableau.connectionData);
var xmlString = conData.xmlString;
if (conData.xmlUrl) {
var successCallback = function(data) {
window.cachedTableData = _xmlToTable(data);
retrieveDataCallback(window.cachedTableData);
};
//_basicAjaxRequest1(conData.xmlUrl, successCallback);
//here try another approach not using yql but xmlHttpRequest?
//try xml dom to get url (xml http request)
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
myFunction(this);
}
};
xhttp.open('GET', 'https://www.w3schools.com/xml/cd_catalog.xml', true);
xhttp.send();
return;
}
try {
var xmlDoc = $.parseXML(conData.xmlString);
window.cachedTableData = _xmlToTable(xmlDoc);
}
catch (e) {
tableau.abortWithError("unable to parse xml data");
return;
}
}
retrieveDataCallback(window.cachedTableData);
}
function myFunction(xml) {
var xmlDoc = xml.responseXML;
window.cachedTableData = _xmlToTable(xmlDoc);
}
// There are a lot of ways to handle URLS. Sometimes we'll need workarounds for CORS. These
// methods chain together a series of attempts to get the data at the given url
function _ajaxRequestHelper(url, successCallback, conUrl, nextFunction,
specialSuccessCallback){
specialSuccessCallback = specialSuccessCallback || successCallback;
var xhr = $.ajax({
url: conUrl,
dataType: 'xml',
success: specialSuccessCallback,
error: function()
{
nextFunction(url, successCallback);
}
});
}
// try the straightforward request
function _basicAjaxRequest1(url, successCallback){
_ajaxRequestHelper(url, successCallback, url, _yqlProxyAjaxRequest2);
}
// try to use yql as a proxy
function _yqlProxyAjaxRequest2(url, successCallback){
var yqlQueryBase = "http://query.yahooapis.com/v1/public/yql?q=";
var query = "select * from htmlstring where url='" + url + "'";
var restOfQueryString = "&format=xml" ;
var yqlUrl = yqlQueryBase + encodeURIComponent(query) + restOfQueryString + "&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys";
_ajaxRequestHelper(url, successCallback, yqlUrl, _giveUpOnUrl9);
}
function _giveUpOnUrl9(url, successCallback) {
tableau.abortWithError("Could not load url: " + url);
}
// Takes a hierarchical xml document and tries to turn it into a table
// Returns an object with headers and the row level data
function _xmlToTable(xmlDocument) {
var rowData = _flattenData(xmlDocument);
var headers = _extractHeaders(rowData);
return {"headers":headers, "rowData":rowData};
}
// Given an object:
// - finds the longest array in the xml
// - flattens each element in that array so it is a single element with many properties
// If there is no array that is a descendent of the original object, this wraps
function _flattenData(xmlDocument) {
// first find the longest array
var longestArray = _findLongestArray(xmlDocument, xmlDocument);
if (!longestArray || longestArray.length == 0) {
// if no array found, just wrap the entire object blob in an array
longestArray = [objectBlob];
}
toRet = ;
for (var ii = 0; ii < longestArray.childNodes.length; ++ii) {
toRet[ii] = _flattenObject(longestArray.childNodes[ii]);
}
return toRet;
}
// Given an element with hierarchical properties, flattens it so all the properties
// sit on the base element.
function _flattenObject(xmlElt) {
var toRet = {};
if (xmlElt.attributes) {
for (var attributeNum = 0; attributeNum < xmlElt.attributes.length; ++attributeNum) {
var attribute = xmlElt.attributes[attributeNum];
toRet[attribute.nodeName] = attribute.nodeValue;
}
}
var children = xmlElt.childNodes;
if (!children || !children.length) {
if (xmlElt.textContent) {
toRet.text = xmlElt.textContent.trim();
}
} else {
for (var childNum = 0; childNum < children.length; ++childNum) {
var child = xmlElt.childNodes[childNum];
var childName = child.nodeName;
var subObj = _flattenObject(child);
for (var k in subObj) {
if (subObj.hasOwnProperty(k)) {
toRet[childName + '_' + k] = subObj[k];
}
}
}
}
return toRet;
}
// Finds the longest array that is a descendent of the given object
function _findLongestArray(xmlElement, bestSoFar) {
var children = xmlElement.childNodes;
if (children && children.length) {
if (children.length > bestSoFar.childNodes.length) {
bestSoFar = xmlElement;
}
for (var childNum in children) {
var subBest = _findLongestArray(children[childNum], bestSoFar);
if (subBest.childNodes.length > bestSoFar.childNodes.length) {
bestSoFar = subBest;
}
}
}
return bestSoFar;
}
// Given an array of js objects, returns a map from data column name to data type
function _extractHeaders(rowData) {
var toRet = {};
for (var row = 0; row < rowData.length; ++row) {
var rowLine = rowData[row];
for (var key in rowLine) {
if (rowLine.hasOwnProperty(key)) {
if (!(key in toRet)) {
toRet[key] = _determineType(rowLine[key]);
}
}
}
}
return toRet;
}
// Given a primitive, tries to make a guess at the data type of the input
function _determineType(primitive) {
// possible types: 'float', 'date', 'datetime', 'bool', 'string', 'int'
if (parseInt(primitive) == primitive) return 'int';
if (parseFloat(primitive) == primitive) return 'float';
if (isFinite(new Date(primitive).getTime())) return 'datetime';
return 'string';
}
function _submitXMLToTableau(xmlString, xmlUrl) {
var conData = {"xmlString" : xmlString, "xmlUrl": xmlUrl};
tableau.connectionData = JSON.stringify(conData);
tableau.submit();
}
function _buildConnectionUrl(url) {
// var yqlQueryBase = "http://query.yahooapis.com/v1/public/yql?q=";
// var query = "select * from html where url='" + url + "'";
// var restOfQueryString = "&format=xml";
// var yqlUrl = yqlQueryBase + encodeURIComponent(query) + restOfQueryString;
// return yqlUrl;
return url;
}
$(document).ready(function(){
var cancel = function (e) {
e.stopPropagation();
e.preventDefault();
}
$("#inputForm").submit(function(e) { // This event fires when a button is clicked
// Since we use a form for input, make sure to stop the default form behavior
cancel(e);
var xmlString = $('textarea[name=xmlText]')[0].value.trim();
var xmlUrl = $('input[name=xmlUrl]')[0].value.trim();
_submitXMLToTableau(xmlString, xmlUrl);
});
var ddHandler = $("#dragandrophandler");
ddHandler.on('dragenter', function (e)
{
cancel(e);
$(this).css('border', '2px solid #0B85A1');
}).on('dragover', cancel)
.on('drop', function (e)
{
$(this).css('border', '2px dashed #0B85A1');
e.preventDefault();
var files = e.originalEvent.dataTransfer.files;
var file = files[0];
var reader = new FileReader();
reader.onload = function(e) { _submitXMLToTableau(reader.result); };
reader.readAsText(file);
});
$(document).on('dragenter', cancel)
.on('drop', cancel)
.on('dragover', function (e)
{
cancel(e);
ddHandler.css('border', '2px dashed #0B85A1');
});
});
</script>
<style>
#dragandrophandler {
border:1px dashed #999;
width:300px;
color:#333;
text-align:left;vertical-align:middle;
padding:10px 10px 10 10px;
margin:10px;
font-size:150%;
}
</style>
</head>
<body>
<form id="inputForm" action="">
Enter a URL for XML data:
<input type="text" name="xmlUrl" size="50" />
<br>
<div id="dragandrophandler">Or Drag & Drop Files Here</div>
<br>
Or paste XML data below
<br>
<textarea name="xmlText" rows="10" cols="70"/></textarea>
<input type="submit" value="Submit">
</form>
javascript xml xmlhttprequest tableau yql
edited Dec 28 '18 at 16:23
Flimzy
37.7k96497
asked Dec 28 '18 at 16:22
VeeVee
368
add a comment |
1
1
1
As others before I used yql to get data from a website. The website is in xml format.
I am doing this to build a web data connector in Tableau to connect to xmldata and I got my code from here: https://github.com/tableau/webdataconnector/blob/v1.1.0/Examples/xmlConnector.html
As recommended on here: YQL: html table is no longer supported I tried htmlstring and added the reference to the community environment.
// try to use yql as a proxy
function _yqlProxyAjaxRequest2(url, successCallback){
var yqlQueryBase = "http://query.yahooapis.com/v1/public/yql?q=";
var query = "select * from htmlstring where url='" + url + "'";
var restOfQueryString = "&format=xml" ;
var yqlUrl = yqlQueryBase + encodeURIComponent(query) + restOfQueryString + "&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys";
_ajaxRequestHelper(url, successCallback, yqlUrl, _giveUpOnUrl9);
}
function _giveUpOnUrl9(url, successCallback) {
tableau.abortWithError("Could not load url: " + url);
}
However, I still got the message: Html table no longer supported.
As I don't know much about yql, I tried to work with xmlHttpRequestinstead, but Tableau ended up processing the request for ages and nothing happened.
Here my attempt to find another solution and avoid the yql thingy:
function _retrieveXmlData(retrieveDataCallback) {
if (!window.cachedTableData) {
var conData = JSON.parse(tableau.connectionData);
var xmlString = conData.xmlString;
if (conData.xmlUrl) {
var successCallback = function(data) {
window.cachedTableData = _xmlToTable(data);
retrieveDataCallback(window.cachedTableData);
};
//INSTEAD OF THIS:
//_basicAjaxRequest1(conData.xmlUrl, successCallback);
//USE NOT YQL BUT XMLHTTPREQUEST:
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
myFunction(this);
}
};
xhttp.open('GET', 'https://www.w3schools.com/xml/cd_catalog.xml', true);
xhttp.send();
return;
}
try {
var xmlDoc = $.parseXML(conData.xmlString);
window.cachedTableData = _xmlToTable(xmlDoc);
}
catch (e) {
tableau.abortWithError("unable to parse xml data");
return;
}
}
retrieveDataCallback(window.cachedTableData);
}
Does anyone have an idea how to get YQL work or comment on my approach trying to avoid it?
Thank you very much!
For reference, if there is any Tableau user that wants to test it on Tableau, here is my full code:
<html>
<head>
<title>XML Connector</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js" type="text/javascript"></script>
<script src="https://connectors.tableau.com/libs/tableauwdc-1.1.1.js" type="text/javascript"></script>
<script type="text/javascript">
(function() {
var myConnector = tableau.makeConnector();
myConnector.init = function () {
tableau.connectionName = 'XML data';
tableau.initCallback();
};
myConnector.getColumnHeaders = function() {
_retrieveXmlData(function (tableData) {
var headers = tableData.headers;
var fieldNames = ;
var fieldTypes = ;
for (var fieldName in headers) {
if (headers.hasOwnProperty(fieldName)) {
fieldNames.push(fieldName);
fieldTypes.push(headers[fieldName]);
}
}
tableau.headersCallback(fieldNames, fieldTypes); // tell tableau about the fields and their types
});
}
myConnector.getTableData = function (lastRecordToken) {
_retrieveXmlData(function (tableData) {
var rowData = tableData.rowData;
tableau.dataCallback(rowData, rowData.length.toString(), false);
});
};
tableau.registerConnector(myConnector);
})();
function _retrieveXmlData(retrieveDataCallback) {
if (!window.cachedTableData) {
var conData = JSON.parse(tableau.connectionData);
var xmlString = conData.xmlString;
if (conData.xmlUrl) {
var successCallback = function(data) {
window.cachedTableData = _xmlToTable(data);
retrieveDataCallback(window.cachedTableData);
};
//_basicAjaxRequest1(conData.xmlUrl, successCallback);
//here try another approach not using yql but xmlHttpRequest?
//try xml dom to get url (xml http request)
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
myFunction(this);
}
};
xhttp.open('GET', 'https://www.w3schools.com/xml/cd_catalog.xml', true);
xhttp.send();
return;
}
try {
var xmlDoc = $.parseXML(conData.xmlString);
window.cachedTableData = _xmlToTable(xmlDoc);
}
catch (e) {
tableau.abortWithError("unable to parse xml data");
return;
}
}
retrieveDataCallback(window.cachedTableData);
}
function myFunction(xml) {
var xmlDoc = xml.responseXML;
window.cachedTableData = _xmlToTable(xmlDoc);
}
// There are a lot of ways to handle URLS. Sometimes we'll need workarounds for CORS. These
// methods chain together a series of attempts to get the data at the given url
function _ajaxRequestHelper(url, successCallback, conUrl, nextFunction,
specialSuccessCallback){
specialSuccessCallback = specialSuccessCallback || successCallback;
var xhr = $.ajax({
url: conUrl,
dataType: 'xml',
success: specialSuccessCallback,
error: function()
{
nextFunction(url, successCallback);
}
});
}
// try the straightforward request
function _basicAjaxRequest1(url, successCallback){
_ajaxRequestHelper(url, successCallback, url, _yqlProxyAjaxRequest2);
}
// try to use yql as a proxy
function _yqlProxyAjaxRequest2(url, successCallback){
var yqlQueryBase = "http://query.yahooapis.com/v1/public/yql?q=";
var query = "select * from htmlstring where url='" + url + "'";
var restOfQueryString = "&format=xml" ;
var yqlUrl = yqlQueryBase + encodeURIComponent(query) + restOfQueryString + "&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys";
_ajaxRequestHelper(url, successCallback, yqlUrl, _giveUpOnUrl9);
}
function _giveUpOnUrl9(url, successCallback) {
tableau.abortWithError("Could not load url: " + url);
}
// Takes a hierarchical xml document and tries to turn it into a table
// Returns an object with headers and the row level data
function _xmlToTable(xmlDocument) {
var rowData = _flattenData(xmlDocument);
var headers = _extractHeaders(rowData);
return {"headers":headers, "rowData":rowData};
}
// Given an object:
// - finds the longest array in the xml
// - flattens each element in that array so it is a single element with many properties
// If there is no array that is a descendent of the original object, this wraps
function _flattenData(xmlDocument) {
// first find the longest array
var longestArray = _findLongestArray(xmlDocument, xmlDocument);
if (!longestArray || longestArray.length == 0) {
// if no array found, just wrap the entire object blob in an array
longestArray = [objectBlob];
}
toRet = ;
for (var ii = 0; ii < longestArray.childNodes.length; ++ii) {
toRet[ii] = _flattenObject(longestArray.childNodes[ii]);
}
return toRet;
}
// Given an element with hierarchical properties, flattens it so all the properties
// sit on the base element.
function _flattenObject(xmlElt) {
var toRet = {};
if (xmlElt.attributes) {
for (var attributeNum = 0; attributeNum < xmlElt.attributes.length; ++attributeNum) {
var attribute = xmlElt.attributes[attributeNum];
toRet[attribute.nodeName] = attribute.nodeValue;
}
}
var children = xmlElt.childNodes;
if (!children || !children.length) {
if (xmlElt.textContent) {
toRet.text = xmlElt.textContent.trim();
}
} else {
for (var childNum = 0; childNum < children.length; ++childNum) {
var child = xmlElt.childNodes[childNum];
var childName = child.nodeName;
var subObj = _flattenObject(child);
for (var k in subObj) {
if (subObj.hasOwnProperty(k)) {
toRet[childName + '_' + k] = subObj[k];
}
}
}
}
return toRet;
}
// Finds the longest array that is a descendent of the given object
function _findLongestArray(xmlElement, bestSoFar) {
var children = xmlElement.childNodes;
if (children && children.length) {
if (children.length > bestSoFar.childNodes.length) {
bestSoFar = xmlElement;
}
for (var childNum in children) {
var subBest = _findLongestArray(children[childNum], bestSoFar);
if (subBest.childNodes.length > bestSoFar.childNodes.length) {
bestSoFar = subBest;
}
}
}
return bestSoFar;
}
// Given an array of js objects, returns a map from data column name to data type
function _extractHeaders(rowData) {
var toRet = {};
for (var row = 0; row < rowData.length; ++row) {
var rowLine = rowData[row];
for (var key in rowLine) {
if (rowLine.hasOwnProperty(key)) {
if (!(key in toRet)) {
toRet[key] = _determineType(rowLine[key]);
}
}
}
}
return toRet;
}
// Given a primitive, tries to make a guess at the data type of the input
function _determineType(primitive) {
// possible types: 'float', 'date', 'datetime', 'bool', 'string', 'int'
if (parseInt(primitive) == primitive) return 'int';
if (parseFloat(primitive) == primitive) return 'float';
if (isFinite(new Date(primitive).getTime())) return 'datetime';
return 'string';
}
function _submitXMLToTableau(xmlString, xmlUrl) {
var conData = {"xmlString" : xmlString, "xmlUrl": xmlUrl};
tableau.connectionData = JSON.stringify(conData);
tableau.submit();
}
function _buildConnectionUrl(url) {
// var yqlQueryBase = "http://query.yahooapis.com/v1/public/yql?q=";
// var query = "select * from html where url='" + url + "'";
// var restOfQueryString = "&format=xml";
// var yqlUrl = yqlQueryBase + encodeURIComponent(query) + restOfQueryString;
// return yqlUrl;
return url;
}
$(document).ready(function(){
var cancel = function (e) {
e.stopPropagation();
e.preventDefault();
}
$("#inputForm").submit(function(e) { // This event fires when a button is clicked
// Since we use a form for input, make sure to stop the default form behavior
cancel(e);
var xmlString = $('textarea[name=xmlText]')[0].value.trim();
var xmlUrl = $('input[name=xmlUrl]')[0].value.trim();
_submitXMLToTableau(xmlString, xmlUrl);
});
var ddHandler = $("#dragandrophandler");
ddHandler.on('dragenter', function (e)
{
cancel(e);
$(this).css('border', '2px solid #0B85A1');
}).on('dragover', cancel)
.on('drop', function (e)
{
$(this).css('border', '2px dashed #0B85A1');
e.preventDefault();
var files = e.originalEvent.dataTransfer.files;
var file = files[0];
var reader = new FileReader();
reader.onload = function(e) { _submitXMLToTableau(reader.result); };
reader.readAsText(file);
});
$(document).on('dragenter', cancel)
.on('drop', cancel)
.on('dragover', function (e)
{
cancel(e);
ddHandler.css('border', '2px dashed #0B85A1');
});
});
</script>
<style>
#dragandrophandler {
border:1px dashed #999;
width:300px;
color:#333;
text-align:left;vertical-align:middle;
padding:10px 10px 10 10px;
margin:10px;
font-size:150%;
}
</style>
</head>
<body>
<form id="inputForm" action="">
Enter a URL for XML data:
<input type="text" name="xmlUrl" size="50" />
<br>
<div id="dragandrophandler">Or Drag & Drop Files Here</div>
<br>
Or paste XML data below
<br>
<textarea name="xmlText" rows="10" cols="70"/></textarea>
<input type="submit" value="Submit">
</form>
javascript xml xmlhttprequest tableau yql
edited Dec 28 '18 at 16:23
Flimzy
37.7k96497
asked Dec 28 '18 at 16:22
VeeVee
368
As others before I used yql to get data from a website. The website is in xml format.
I am doing this to build a web data connector in Tableau to connect to xmldata and I got my code from here: https://github.com/tableau/webdataconnector/blob/v1.1.0/Examples/xmlConnector.html
As recommended on here: YQL: html table is no longer supported I tried htmlstring and added the reference to the community environment.
// try to use yql as a proxy
function _yqlProxyAjaxRequest2(url, successCallback){
var yqlQueryBase = "http://query.yahooapis.com/v1/public/yql?q=";
var query = "select * from htmlstring where url='" + url + "'";
var restOfQueryString = "&format=xml" ;
var yqlUrl = yqlQueryBase + encodeURIComponent(query) + restOfQueryString + "&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys";
_ajaxRequestHelper(url, successCallback, yqlUrl, _giveUpOnUrl9);
}
function _giveUpOnUrl9(url, successCallback) {
tableau.abortWithError("Could not load url: " + url);
}
However, I still got the message: Html table no longer supported.
As I don't know much about yql, I tried to work with xmlHttpRequestinstead, but Tableau ended up processing the request for ages and nothing happened.
Here my attempt to find another solution and avoid the yql thingy:
function _retrieveXmlData(retrieveDataCallback) {
if (!window.cachedTableData) {
var conData = JSON.parse(tableau.connectionData);
var xmlString = conData.xmlString;
if (conData.xmlUrl) {
var successCallback = function(data) {
window.cachedTableData = _xmlToTable(data);
retrieveDataCallback(window.cachedTableData);
};
//INSTEAD OF THIS:
//_basicAjaxRequest1(conData.xmlUrl, successCallback);
//USE NOT YQL BUT XMLHTTPREQUEST:
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
myFunction(this);
}
};
xhttp.open('GET', 'https://www.w3schools.com/xml/cd_catalog.xml', true);
xhttp.send();
return;
}
try {
var xmlDoc = $.parseXML(conData.xmlString);
window.cachedTableData = _xmlToTable(xmlDoc);
}
catch (e) {
tableau.abortWithError("unable to parse xml data");
return;
}
}
retrieveDataCallback(window.cachedTableData);
}
Does anyone have an idea how to get YQL work or comment on my approach trying to avoid it?
Thank you very much!
For reference, if there is any Tableau user that wants to test it on Tableau, here is my full code:
<html>
<head>
<title>XML Connector</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js" type="text/javascript"></script>
<script src="https://connectors.tableau.com/libs/tableauwdc-1.1.1.js" type="text/javascript"></script>
<script type="text/javascript">
(function() {
var myConnector = tableau.makeConnector();
myConnector.init = function () {
tableau.connectionName = 'XML data';
tableau.initCallback();
};
myConnector.getColumnHeaders = function() {
_retrieveXmlData(function (tableData) {
var headers = tableData.headers;
var fieldNames = ;
var fieldTypes = ;
for (var fieldName in headers) {
if (headers.hasOwnProperty(fieldName)) {
fieldNames.push(fieldName);
fieldTypes.push(headers[fieldName]);
}
}
tableau.headersCallback(fieldNames, fieldTypes); // tell tableau about the fields and their types
});
}
myConnector.getTableData = function (lastRecordToken) {
_retrieveXmlData(function (tableData) {
var rowData = tableData.rowData;
tableau.dataCallback(rowData, rowData.length.toString(), false);
});
};
tableau.registerConnector(myConnector);
})();
function _retrieveXmlData(retrieveDataCallback) {
if (!window.cachedTableData) {
var conData = JSON.parse(tableau.connectionData);
var xmlString = conData.xmlString;
if (conData.xmlUrl) {
var successCallback = function(data) {
window.cachedTableData = _xmlToTable(data);
retrieveDataCallback(window.cachedTableData);
};
//_basicAjaxRequest1(conData.xmlUrl, successCallback);
//here try another approach not using yql but xmlHttpRequest?
//try xml dom to get url (xml http request)
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
myFunction(this);
}
};
xhttp.open('GET', 'https://www.w3schools.com/xml/cd_catalog.xml', true);
xhttp.send();
return;
}
try {
var xmlDoc = $.parseXML(conData.xmlString);
window.cachedTableData = _xmlToTable(xmlDoc);
}
catch (e) {
tableau.abortWithError("unable to parse xml data");
return;
}
}
retrieveDataCallback(window.cachedTableData);
}
function myFunction(xml) {
var xmlDoc = xml.responseXML;
window.cachedTableData = _xmlToTable(xmlDoc);
}
// There are a lot of ways to handle URLS. Sometimes we'll need workarounds for CORS. These
// methods chain together a series of attempts to get the data at the given url
function _ajaxRequestHelper(url, successCallback, conUrl, nextFunction,
specialSuccessCallback){
specialSuccessCallback = specialSuccessCallback || successCallback;
var xhr = $.ajax({
url: conUrl,
dataType: 'xml',
success: specialSuccessCallback,
error: function()
{
nextFunction(url, successCallback);
}
});
}
// try the straightforward request
function _basicAjaxRequest1(url, successCallback){
_ajaxRequestHelper(url, successCallback, url, _yqlProxyAjaxRequest2);
}
// try to use yql as a proxy
function _yqlProxyAjaxRequest2(url, successCallback){
var yqlQueryBase = "http://query.yahooapis.com/v1/public/yql?q=";
var query = "select * from htmlstring where url='" + url + "'";
var restOfQueryString = "&format=xml" ;
var yqlUrl = yqlQueryBase + encodeURIComponent(query) + restOfQueryString + "&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys";
_ajaxRequestHelper(url, successCallback, yqlUrl, _giveUpOnUrl9);
}
function _giveUpOnUrl9(url, successCallback) {
tableau.abortWithError("Could not load url: " + url);
}
// Takes a hierarchical xml document and tries to turn it into a table
// Returns an object with headers and the row level data
function _xmlToTable(xmlDocument) {
var rowData = _flattenData(xmlDocument);
var headers = _extractHeaders(rowData);
return {"headers":headers, "rowData":rowData};
}
// Given an object:
// - finds the longest array in the xml
// - flattens each element in that array so it is a single element with many properties
// If there is no array that is a descendent of the original object, this wraps
function _flattenData(xmlDocument) {
// first find the longest array
var longestArray = _findLongestArray(xmlDocument, xmlDocument);
if (!longestArray || longestArray.length == 0) {
// if no array found, just wrap the entire object blob in an array
longestArray = [objectBlob];
}
toRet = ;
for (var ii = 0; ii < longestArray.childNodes.length; ++ii) {
toRet[ii] = _flattenObject(longestArray.childNodes[ii]);
}
return toRet;
}
// Given an element with hierarchical properties, flattens it so all the properties
// sit on the base element.
function _flattenObject(xmlElt) {
var toRet = {};
if (xmlElt.attributes) {
for (var attributeNum = 0; attributeNum < xmlElt.attributes.length; ++attributeNum) {
var attribute = xmlElt.attributes[attributeNum];
toRet[attribute.nodeName] = attribute.nodeValue;
}
}
var children = xmlElt.childNodes;
if (!children || !children.length) {
if (xmlElt.textContent) {
toRet.text = xmlElt.textContent.trim();
}
} else {
for (var childNum = 0; childNum < children.length; ++childNum) {
var child = xmlElt.childNodes[childNum];
var childName = child.nodeName;
var subObj = _flattenObject(child);
for (var k in subObj) {
if (subObj.hasOwnProperty(k)) {
toRet[childName + '_' + k] = subObj[k];
}
}
}
}
return toRet;
}
// Finds the longest array that is a descendent of the given object
function _findLongestArray(xmlElement, bestSoFar) {
var children = xmlElement.childNodes;
if (children && children.length) {
if (children.length > bestSoFar.childNodes.length) {
bestSoFar = xmlElement;
}
for (var childNum in children) {
var subBest = _findLongestArray(children[childNum], bestSoFar);
if (subBest.childNodes.length > bestSoFar.childNodes.length) {
bestSoFar = subBest;
}
}
}
return bestSoFar;
}
// Given an array of js objects, returns a map from data column name to data type
function _extractHeaders(rowData) {
var toRet = {};
for (var row = 0; row < rowData.length; ++row) {
var rowLine = rowData[row];
for (var key in rowLine) {
if (rowLine.hasOwnProperty(key)) {
if (!(key in toRet)) {
toRet[key] = _determineType(rowLine[key]);
}
}
}
}
return toRet;
}
// Given a primitive, tries to make a guess at the data type of the input
function _determineType(primitive) {
// possible types: 'float', 'date', 'datetime', 'bool', 'string', 'int'
if (parseInt(primitive) == primitive) return 'int';
if (parseFloat(primitive) == primitive) return 'float';
if (isFinite(new Date(primitive).getTime())) return 'datetime';
return 'string';
}
function _submitXMLToTableau(xmlString, xmlUrl) {
var conData = {"xmlString" : xmlString, "xmlUrl": xmlUrl};
tableau.connectionData = JSON.stringify(conData);
tableau.submit();
}
function _buildConnectionUrl(url) {
// var yqlQueryBase = "http://query.yahooapis.com/v1/public/yql?q=";
// var query = "select * from html where url='" + url + "'";
// var restOfQueryString = "&format=xml";
// var yqlUrl = yqlQueryBase + encodeURIComponent(query) + restOfQueryString;
// return yqlUrl;
return url;
}
$(document).ready(function(){
var cancel = function (e) {
e.stopPropagation();
e.preventDefault();
}
$("#inputForm").submit(function(e) { // This event fires when a button is clicked
// Since we use a form for input, make sure to stop the default form behavior
cancel(e);
var xmlString = $('textarea[name=xmlText]')[0].value.trim();
var xmlUrl = $('input[name=xmlUrl]')[0].value.trim();
_submitXMLToTableau(xmlString, xmlUrl);
});
var ddHandler = $("#dragandrophandler");
ddHandler.on('dragenter', function (e)
{
cancel(e);
$(this).css('border', '2px solid #0B85A1');
}).on('dragover', cancel)
.on('drop', function (e)
{
$(this).css('border', '2px dashed #0B85A1');
e.preventDefault();
var files = e.originalEvent.dataTransfer.files;
var file = files[0];
var reader = new FileReader();
reader.onload = function(e) { _submitXMLToTableau(reader.result); };
reader.readAsText(file);
});
$(document).on('dragenter', cancel)
.on('drop', cancel)
.on('dragover', function (e)
{
cancel(e);
ddHandler.css('border', '2px dashed #0B85A1');
});
});
</script>
<style>
#dragandrophandler {
border:1px dashed #999;
width:300px;
color:#333;
text-align:left;vertical-align:middle;
padding:10px 10px 10 10px;
margin:10px;
font-size:150%;
}
</style>
</head>
<body>
<form id="inputForm" action="">
Enter a URL for XML data:
<input type="text" name="xmlUrl" size="50" />
<br>
<div id="dragandrophandler">Or Drag & Drop Files Here</div>
<br>
Or paste XML data below
<br>
<textarea name="xmlText" rows="10" cols="70"/></textarea>
<input type="submit" value="Submit">
</form>
javascript xml xmlhttprequest tableau yql
javascript xml xmlhttprequest tableau yql
edited Dec 28 '18 at 16:23
Flimzy
37.7k96497
asked Dec 28 '18 at 16:22
VeeVee
368
edited Dec 28 '18 at 16:23
Flimzy
37.7k96497
asked Dec 28 '18 at 16:22
VeeVee
368
edited Dec 28 '18 at 16:23
Flimzy
37.7k96497
edited Dec 28 '18 at 16:23
Flimzy
37.7k96497
edited Dec 28 '18 at 16:23
Flimzy
37.7k96497
37.7k96497
asked Dec 28 '18 at 16:22
VeeVee
368
asked Dec 28 '18 at 16:22
VeeVee
368
asked Dec 28 '18 at 16:22
VeeVee
368
368
add a comment |
add a comment |
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- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
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