What all information we can pass as parameters to inline event handlers?
I found this code on internet where author is passing id of the element as first parameter to the event handler. Refer to the sample below.
Until today, I was under the impression that we can pass only event information as argument to the event handler and I can see that we can pass id of current element also as parameter to event handler.
Where is this documented on MDN? Can someone point to me the documentation?
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<input type="text" value="Hello" onchange="someFunction(id,event);" id="someId"/>
</body>
<script type="text/javascript">
function someFunction(id,event){
console.log(id); //Printing "someId"
console.log(event.target.value); //It is printing updated value
}
</script>
</html>
javascript html
asked Jan 1 at 1:14
javanoobjavanoob
2,065134675
add a comment |
I found this code on internet where author is passing id of the element as first parameter to the event handler. Refer to the sample below.
Until today, I was under the impression that we can pass only event information as argument to the event handler and I can see that we can pass id of current element also as parameter to event handler.
Where is this documented on MDN? Can someone point to me the documentation?
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<input type="text" value="Hello" onchange="someFunction(id,event);" id="someId"/>
</body>
<script type="text/javascript">
function someFunction(id,event){
console.log(id); //Printing "someId"
console.log(event.target.value); //It is printing updated value
}
</script>
</html>
javascript html
asked Jan 1 at 1:14
javanoobjavanoob
2,065134675
Yes, it is possible to get id asevent.target.idbut I am curious as where is it documented that we can passIdof element also?
– javanoob
Jan 1 at 1:19
developer.mozilla.org/en-US/docs/Web/API/Element
– ecg8
Jan 1 at 1:24
add a comment |
I found this code on internet where author is passing id of the element as first parameter to the event handler. Refer to the sample below.
Until today, I was under the impression that we can pass only event information as argument to the event handler and I can see that we can pass id of current element also as parameter to event handler.
Where is this documented on MDN? Can someone point to me the documentation?
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<input type="text" value="Hello" onchange="someFunction(id,event);" id="someId"/>
</body>
<script type="text/javascript">
function someFunction(id,event){
console.log(id); //Printing "someId"
console.log(event.target.value); //It is printing updated value
}
</script>
</html>
javascript html
asked Jan 1 at 1:14
javanoobjavanoob
2,065134675
I found this code on internet where author is passing id of the element as first parameter to the event handler. Refer to the sample below.
Until today, I was under the impression that we can pass only event information as argument to the event handler and I can see that we can pass id of current element also as parameter to event handler.
Where is this documented on MDN? Can someone point to me the documentation?
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<input type="text" value="Hello" onchange="someFunction(id,event);" id="someId"/>
</body>
<script type="text/javascript">
function someFunction(id,event){
console.log(id); //Printing "someId"
console.log(event.target.value); //It is printing updated value
}
</script>
</html>
javascript html
javascript html
asked Jan 1 at 1:14
javanoobjavanoob
2,065134675
asked Jan 1 at 1:14
javanoobjavanoob
2,065134675
edited Jan 1 at 1:45
javanoob
asked Jan 1 at 1:14
javanoobjavanoob
2,065134675
asked Jan 1 at 1:14
javanoobjavanoob
2,065134675
asked Jan 1 at 1:14
javanoobjavanoob
2,065134675
2,065134675
Yes, it is possible to get id asevent.target.idbut I am curious as where is it documented that we can passIdof element also?
– javanoob
Jan 1 at 1:19
developer.mozilla.org/en-US/docs/Web/API/Element
– ecg8
Jan 1 at 1:24
add a comment |
Yes, it is possible to get id asevent.target.idbut I am curious as where is it documented that we can passIdof element also?
– javanoob
Jan 1 at 1:19
developer.mozilla.org/en-US/docs/Web/API/Element
– ecg8
Jan 1 at 1:24
Yes, it is possible to get id as
event.target.id but I am curious as where is it documented that we can pass Id of element also?– javanoob
Jan 1 at 1:19
Yes, it is possible to get id as
event.target.id but I am curious as where is it documented that we can pass Id of element also?– javanoob
Jan 1 at 1:19
developer.mozilla.org/en-US/docs/Web/API/Element
– ecg8
Jan 1 at 1:24
developer.mozilla.org/en-US/docs/Web/API/Element
– ecg8
Jan 1 at 1:24
add a comment |
1 Answer
1
active
oldest
votes
I believe you can refer to any property that's somewhere in the element's prototype chain as a standalone variable:
function someFunction(id, onclick, children, clientTop) {
console.log(id); // someId
console.log(onclick); // note, this is null, not undefined!
console.log(children); // length 0, but still an HTMLCollection
console.log(clientTop); // 2
}<input type="text" value="Hello" onchange="someFunction(id, onclick, children, clientTop);" id="someId" />It's as if the inline handler is wrapped in a with(this). Referencing a property name that exists on the element object, or in the element's prototype chain, will result in that property value being referenced.
So, an inline handler like
<input onchange="somestr">
is interpreted something like
// assume this refers to that input element:
with (this) {
eval(somestr);
}
Note that event is in a different category - it's not a property of the element, it's a global window.event.
answered Jan 1 at 1:24
CertainPerformanceCertainPerformance
86.7k154774
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
I believe you can refer to any property that's somewhere in the element's prototype chain as a standalone variable:
function someFunction(id, onclick, children, clientTop) {
console.log(id); // someId
console.log(onclick); // note, this is null, not undefined!
console.log(children); // length 0, but still an HTMLCollection
console.log(clientTop); // 2
}<input type="text" value="Hello" onchange="someFunction(id, onclick, children, clientTop);" id="someId" />It's as if the inline handler is wrapped in a with(this). Referencing a property name that exists on the element object, or in the element's prototype chain, will result in that property value being referenced.
So, an inline handler like
<input onchange="somestr">
is interpreted something like
// assume this refers to that input element:
with (this) {
eval(somestr);
}
Note that event is in a different category - it's not a property of the element, it's a global window.event.
answered Jan 1 at 1:24
CertainPerformanceCertainPerformance
86.7k154774
add a comment |
I believe you can refer to any property that's somewhere in the element's prototype chain as a standalone variable:
function someFunction(id, onclick, children, clientTop) {
console.log(id); // someId
console.log(onclick); // note, this is null, not undefined!
console.log(children); // length 0, but still an HTMLCollection
console.log(clientTop); // 2
}<input type="text" value="Hello" onchange="someFunction(id, onclick, children, clientTop);" id="someId" />It's as if the inline handler is wrapped in a with(this). Referencing a property name that exists on the element object, or in the element's prototype chain, will result in that property value being referenced.
So, an inline handler like
<input onchange="somestr">
is interpreted something like
// assume this refers to that input element:
with (this) {
eval(somestr);
}
Note that event is in a different category - it's not a property of the element, it's a global window.event.
answered Jan 1 at 1:24
CertainPerformanceCertainPerformance
86.7k154774
add a comment |
I believe you can refer to any property that's somewhere in the element's prototype chain as a standalone variable:
function someFunction(id, onclick, children, clientTop) {
console.log(id); // someId
console.log(onclick); // note, this is null, not undefined!
console.log(children); // length 0, but still an HTMLCollection
console.log(clientTop); // 2
}<input type="text" value="Hello" onchange="someFunction(id, onclick, children, clientTop);" id="someId" />It's as if the inline handler is wrapped in a with(this). Referencing a property name that exists on the element object, or in the element's prototype chain, will result in that property value being referenced.
So, an inline handler like
<input onchange="somestr">
is interpreted something like
// assume this refers to that input element:
with (this) {
eval(somestr);
}
Note that event is in a different category - it's not a property of the element, it's a global window.event.
answered Jan 1 at 1:24
CertainPerformanceCertainPerformance
86.7k154774
I believe you can refer to any property that's somewhere in the element's prototype chain as a standalone variable:
function someFunction(id, onclick, children, clientTop) {
console.log(id); // someId
console.log(onclick); // note, this is null, not undefined!
console.log(children); // length 0, but still an HTMLCollection
console.log(clientTop); // 2
}<input type="text" value="Hello" onchange="someFunction(id, onclick, children, clientTop);" id="someId" />It's as if the inline handler is wrapped in a with(this). Referencing a property name that exists on the element object, or in the element's prototype chain, will result in that property value being referenced.
So, an inline handler like
<input onchange="somestr">
is interpreted something like
// assume this refers to that input element:
with (this) {
eval(somestr);
}
Note that event is in a different category - it's not a property of the element, it's a global window.event.
function someFunction(id, onclick, children, clientTop) {
console.log(id); // someId
console.log(onclick); // note, this is null, not undefined!
console.log(children); // length 0, but still an HTMLCollection
console.log(clientTop); // 2
}<input type="text" value="Hello" onchange="someFunction(id, onclick, children, clientTop);" id="someId" />function someFunction(id, onclick, children, clientTop) {
console.log(id); // someId
console.log(onclick); // note, this is null, not undefined!
console.log(children); // length 0, but still an HTMLCollection
console.log(clientTop); // 2
}<input type="text" value="Hello" onchange="someFunction(id, onclick, children, clientTop);" id="someId" />answered Jan 1 at 1:24
CertainPerformanceCertainPerformance
86.7k154774
answered Jan 1 at 1:24
CertainPerformanceCertainPerformance
86.7k154774
answered Jan 1 at 1:24
CertainPerformanceCertainPerformance
86.7k154774
answered Jan 1 at 1:24
CertainPerformanceCertainPerformance
86.7k154774
86.7k154774
add a comment |
add a comment |
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Yes, it is possible to get id as
event.target.idbut I am curious as where is it documented that we can passIdof element also?– javanoob
Jan 1 at 1:19
developer.mozilla.org/en-US/docs/Web/API/Element
– ecg8
Jan 1 at 1:24