Value of global variable isn`t changing although its local value is changing
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Multi tool use
The value of the global variable currentLength
is changed by entering different values to input. It is necessary that the value of the global variable currentLength
be equal to the current value in input.
Entering the number 120, alert
should work, it does not work, which means that the value of the global variable isn`t redefined.
function getCurrentLength() {
let currentLength = 0;
let output = document.getElementById('output');
calcLength();
function calcLength() {
let total = +output.value;
let len = document.getElementsByClassName('len');
for (let i = 0; i < len.length; i++) {
len[i].addEventListener('input', function() {
let value = 0;
currentLength = +len[i].value;
for (let j = 0; j < len.length; j++) {
let num = +len[j].value || 0;
value += num;
}
output.value = total + value;
})
}
}
if (currentLength === 120) {
alert(currentLength)
}
}
getCurrentLength();
<input type="text" placeholder="length" class="len">
<input type="text" placeholder="length" class="len">
<input type="text" placeholder="length" class="len">
<input type="text" placeholder="length" class="len">
<input type="text" placeholder="length" class="len">
<input type="text" id="output" placeholder="output">
I expect currentLength
value is 120, but its all the time 0, be it alert or just using of
currentLength` value for further global operations, it makes nothing.
javascript ecmascript-6
add a comment |
The value of the global variable currentLength
is changed by entering different values to input. It is necessary that the value of the global variable currentLength
be equal to the current value in input.
Entering the number 120, alert
should work, it does not work, which means that the value of the global variable isn`t redefined.
function getCurrentLength() {
let currentLength = 0;
let output = document.getElementById('output');
calcLength();
function calcLength() {
let total = +output.value;
let len = document.getElementsByClassName('len');
for (let i = 0; i < len.length; i++) {
len[i].addEventListener('input', function() {
let value = 0;
currentLength = +len[i].value;
for (let j = 0; j < len.length; j++) {
let num = +len[j].value || 0;
value += num;
}
output.value = total + value;
})
}
}
if (currentLength === 120) {
alert(currentLength)
}
}
getCurrentLength();
<input type="text" placeholder="length" class="len">
<input type="text" placeholder="length" class="len">
<input type="text" placeholder="length" class="len">
<input type="text" placeholder="length" class="len">
<input type="text" placeholder="length" class="len">
<input type="text" id="output" placeholder="output">
I expect currentLength
value is 120, but its all the time 0, be it alert or just using of
currentLength` value for further global operations, it makes nothing.
javascript ecmascript-6
3
Yourif(currentLength === 120)
block runs exactly once at the very start, then never again. So even ifcurrentLength
ends up being 120, the alert won't show.currentLength
does change its value all the time, it's always one digit behind what I type in the first input for instance. How is this supposed to work exactly? Is this about adding all input values together?
– Chris G
2 days ago
You also have two functions but you only call them once, which makes it kinda superfluous to have a function in the first place. I tried to clean up the code: jsfiddle.net/khrismuc/rsdgc503
– Chris G
2 days ago
I need current value (that is inside an event listener) to be assigned to global variable (that is outside of event listener). Value of global variable is used for further mathematical operations
– Alex
2 days ago
What concerns the code above: 1. Result of all input values isn`t a current result, it summarizes all entered values between each other. 2. I have several mathematical operations that have result used each for next mathematical operations, well, I do it using functions otherwise it will be very unstructured...
– Alex
2 days ago
add a comment |
The value of the global variable currentLength
is changed by entering different values to input. It is necessary that the value of the global variable currentLength
be equal to the current value in input.
Entering the number 120, alert
should work, it does not work, which means that the value of the global variable isn`t redefined.
function getCurrentLength() {
let currentLength = 0;
let output = document.getElementById('output');
calcLength();
function calcLength() {
let total = +output.value;
let len = document.getElementsByClassName('len');
for (let i = 0; i < len.length; i++) {
len[i].addEventListener('input', function() {
let value = 0;
currentLength = +len[i].value;
for (let j = 0; j < len.length; j++) {
let num = +len[j].value || 0;
value += num;
}
output.value = total + value;
})
}
}
if (currentLength === 120) {
alert(currentLength)
}
}
getCurrentLength();
<input type="text" placeholder="length" class="len">
<input type="text" placeholder="length" class="len">
<input type="text" placeholder="length" class="len">
<input type="text" placeholder="length" class="len">
<input type="text" placeholder="length" class="len">
<input type="text" id="output" placeholder="output">
I expect currentLength
value is 120, but its all the time 0, be it alert or just using of
currentLength` value for further global operations, it makes nothing.
javascript ecmascript-6
The value of the global variable currentLength
is changed by entering different values to input. It is necessary that the value of the global variable currentLength
be equal to the current value in input.
Entering the number 120, alert
should work, it does not work, which means that the value of the global variable isn`t redefined.
function getCurrentLength() {
let currentLength = 0;
let output = document.getElementById('output');
calcLength();
function calcLength() {
let total = +output.value;
let len = document.getElementsByClassName('len');
for (let i = 0; i < len.length; i++) {
len[i].addEventListener('input', function() {
let value = 0;
currentLength = +len[i].value;
for (let j = 0; j < len.length; j++) {
let num = +len[j].value || 0;
value += num;
}
output.value = total + value;
})
}
}
if (currentLength === 120) {
alert(currentLength)
}
}
getCurrentLength();
<input type="text" placeholder="length" class="len">
<input type="text" placeholder="length" class="len">
<input type="text" placeholder="length" class="len">
<input type="text" placeholder="length" class="len">
<input type="text" placeholder="length" class="len">
<input type="text" id="output" placeholder="output">
I expect currentLength
value is 120, but its all the time 0, be it alert or just using of
currentLength` value for further global operations, it makes nothing.
function getCurrentLength() {
let currentLength = 0;
let output = document.getElementById('output');
calcLength();
function calcLength() {
let total = +output.value;
let len = document.getElementsByClassName('len');
for (let i = 0; i < len.length; i++) {
len[i].addEventListener('input', function() {
let value = 0;
currentLength = +len[i].value;
for (let j = 0; j < len.length; j++) {
let num = +len[j].value || 0;
value += num;
}
output.value = total + value;
})
}
}
if (currentLength === 120) {
alert(currentLength)
}
}
getCurrentLength();
<input type="text" placeholder="length" class="len">
<input type="text" placeholder="length" class="len">
<input type="text" placeholder="length" class="len">
<input type="text" placeholder="length" class="len">
<input type="text" placeholder="length" class="len">
<input type="text" id="output" placeholder="output">
function getCurrentLength() {
let currentLength = 0;
let output = document.getElementById('output');
calcLength();
function calcLength() {
let total = +output.value;
let len = document.getElementsByClassName('len');
for (let i = 0; i < len.length; i++) {
len[i].addEventListener('input', function() {
let value = 0;
currentLength = +len[i].value;
for (let j = 0; j < len.length; j++) {
let num = +len[j].value || 0;
value += num;
}
output.value = total + value;
})
}
}
if (currentLength === 120) {
alert(currentLength)
}
}
getCurrentLength();
<input type="text" placeholder="length" class="len">
<input type="text" placeholder="length" class="len">
<input type="text" placeholder="length" class="len">
<input type="text" placeholder="length" class="len">
<input type="text" placeholder="length" class="len">
<input type="text" id="output" placeholder="output">
javascript ecmascript-6
javascript ecmascript-6
edited 2 days ago
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
Wais Kamal
1,7041519
1,7041519
asked 2 days ago
Alex
1135
1135
3
Yourif(currentLength === 120)
block runs exactly once at the very start, then never again. So even ifcurrentLength
ends up being 120, the alert won't show.currentLength
does change its value all the time, it's always one digit behind what I type in the first input for instance. How is this supposed to work exactly? Is this about adding all input values together?
– Chris G
2 days ago
You also have two functions but you only call them once, which makes it kinda superfluous to have a function in the first place. I tried to clean up the code: jsfiddle.net/khrismuc/rsdgc503
– Chris G
2 days ago
I need current value (that is inside an event listener) to be assigned to global variable (that is outside of event listener). Value of global variable is used for further mathematical operations
– Alex
2 days ago
What concerns the code above: 1. Result of all input values isn`t a current result, it summarizes all entered values between each other. 2. I have several mathematical operations that have result used each for next mathematical operations, well, I do it using functions otherwise it will be very unstructured...
– Alex
2 days ago
add a comment |
3
Yourif(currentLength === 120)
block runs exactly once at the very start, then never again. So even ifcurrentLength
ends up being 120, the alert won't show.currentLength
does change its value all the time, it's always one digit behind what I type in the first input for instance. How is this supposed to work exactly? Is this about adding all input values together?
– Chris G
2 days ago
You also have two functions but you only call them once, which makes it kinda superfluous to have a function in the first place. I tried to clean up the code: jsfiddle.net/khrismuc/rsdgc503
– Chris G
2 days ago
I need current value (that is inside an event listener) to be assigned to global variable (that is outside of event listener). Value of global variable is used for further mathematical operations
– Alex
2 days ago
What concerns the code above: 1. Result of all input values isn`t a current result, it summarizes all entered values between each other. 2. I have several mathematical operations that have result used each for next mathematical operations, well, I do it using functions otherwise it will be very unstructured...
– Alex
2 days ago
3
3
Your
if(currentLength === 120)
block runs exactly once at the very start, then never again. So even if currentLength
ends up being 120, the alert won't show. currentLength
does change its value all the time, it's always one digit behind what I type in the first input for instance. How is this supposed to work exactly? Is this about adding all input values together?– Chris G
2 days ago
Your
if(currentLength === 120)
block runs exactly once at the very start, then never again. So even if currentLength
ends up being 120, the alert won't show. currentLength
does change its value all the time, it's always one digit behind what I type in the first input for instance. How is this supposed to work exactly? Is this about adding all input values together?– Chris G
2 days ago
You also have two functions but you only call them once, which makes it kinda superfluous to have a function in the first place. I tried to clean up the code: jsfiddle.net/khrismuc/rsdgc503
– Chris G
2 days ago
You also have two functions but you only call them once, which makes it kinda superfluous to have a function in the first place. I tried to clean up the code: jsfiddle.net/khrismuc/rsdgc503
– Chris G
2 days ago
I need current value (that is inside an event listener) to be assigned to global variable (that is outside of event listener). Value of global variable is used for further mathematical operations
– Alex
2 days ago
I need current value (that is inside an event listener) to be assigned to global variable (that is outside of event listener). Value of global variable is used for further mathematical operations
– Alex
2 days ago
What concerns the code above: 1. Result of all input values isn`t a current result, it summarizes all entered values between each other. 2. I have several mathematical operations that have result used each for next mathematical operations, well, I do it using functions otherwise it will be very unstructured...
– Alex
2 days ago
What concerns the code above: 1. Result of all input values isn`t a current result, it summarizes all entered values between each other. 2. I have several mathematical operations that have result used each for next mathematical operations, well, I do it using functions otherwise it will be very unstructured...
– Alex
2 days ago
add a comment |
1 Answer
1
active
oldest
votes
The reason is quite simple: You check currentLength === 120
once when calling getCurrentLength
, but at that time, there is no currentLength
, because currentLength
only gets set when an input field changes.
Change your currentLength === 120
check to be inside the event handler, then you will get the expected result:
// ...
output.value = total + value;
if (currentLength === 120) {
alert (currentLength);
}
// ...
I need current value (that is inside an event listener) to be assigned to global variable (that is outside of event listener). Value of global variable is used for further mathematical operations, well, I need it anyway.
– Alex
2 days ago
Yes, you are assigning the global variable. But yourif
check runs only once at the beginning, where it cannot be fulfilled yet. So either run it inside the event handlers, or add a button to run the check. With your current implementation, yourcurrentLength === 120
check will run once and fail.
– NikxDa
2 days ago
My level isn't so good, but I guess that it can be possible to do with callbacks or maybe one more event handler, isn`t it?
– Alex
2 days ago
When exactly do you want your alert to pop up? To understand your program flow, I will need more details.
– NikxDa
2 days ago
1. functiongetCurrentLength()
is called 2. I can freely take value ofcurrentLength
for manipulations with it on the levels higher. All full code, if you need, here - codepen.io/alexseveneight/pen/MZWJjR Code chaining there is: calcLength() is one of code samples that gives me needed parameter. There are several functions there with outputting parameters. Then, calling functionglobalCalc()
, I get all parameters for further operations.
– Alex
2 days ago
add a comment |
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1 Answer
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votes
The reason is quite simple: You check currentLength === 120
once when calling getCurrentLength
, but at that time, there is no currentLength
, because currentLength
only gets set when an input field changes.
Change your currentLength === 120
check to be inside the event handler, then you will get the expected result:
// ...
output.value = total + value;
if (currentLength === 120) {
alert (currentLength);
}
// ...
I need current value (that is inside an event listener) to be assigned to global variable (that is outside of event listener). Value of global variable is used for further mathematical operations, well, I need it anyway.
– Alex
2 days ago
Yes, you are assigning the global variable. But yourif
check runs only once at the beginning, where it cannot be fulfilled yet. So either run it inside the event handlers, or add a button to run the check. With your current implementation, yourcurrentLength === 120
check will run once and fail.
– NikxDa
2 days ago
My level isn't so good, but I guess that it can be possible to do with callbacks or maybe one more event handler, isn`t it?
– Alex
2 days ago
When exactly do you want your alert to pop up? To understand your program flow, I will need more details.
– NikxDa
2 days ago
1. functiongetCurrentLength()
is called 2. I can freely take value ofcurrentLength
for manipulations with it on the levels higher. All full code, if you need, here - codepen.io/alexseveneight/pen/MZWJjR Code chaining there is: calcLength() is one of code samples that gives me needed parameter. There are several functions there with outputting parameters. Then, calling functionglobalCalc()
, I get all parameters for further operations.
– Alex
2 days ago
add a comment |
The reason is quite simple: You check currentLength === 120
once when calling getCurrentLength
, but at that time, there is no currentLength
, because currentLength
only gets set when an input field changes.
Change your currentLength === 120
check to be inside the event handler, then you will get the expected result:
// ...
output.value = total + value;
if (currentLength === 120) {
alert (currentLength);
}
// ...
I need current value (that is inside an event listener) to be assigned to global variable (that is outside of event listener). Value of global variable is used for further mathematical operations, well, I need it anyway.
– Alex
2 days ago
Yes, you are assigning the global variable. But yourif
check runs only once at the beginning, where it cannot be fulfilled yet. So either run it inside the event handlers, or add a button to run the check. With your current implementation, yourcurrentLength === 120
check will run once and fail.
– NikxDa
2 days ago
My level isn't so good, but I guess that it can be possible to do with callbacks or maybe one more event handler, isn`t it?
– Alex
2 days ago
When exactly do you want your alert to pop up? To understand your program flow, I will need more details.
– NikxDa
2 days ago
1. functiongetCurrentLength()
is called 2. I can freely take value ofcurrentLength
for manipulations with it on the levels higher. All full code, if you need, here - codepen.io/alexseveneight/pen/MZWJjR Code chaining there is: calcLength() is one of code samples that gives me needed parameter. There are several functions there with outputting parameters. Then, calling functionglobalCalc()
, I get all parameters for further operations.
– Alex
2 days ago
add a comment |
The reason is quite simple: You check currentLength === 120
once when calling getCurrentLength
, but at that time, there is no currentLength
, because currentLength
only gets set when an input field changes.
Change your currentLength === 120
check to be inside the event handler, then you will get the expected result:
// ...
output.value = total + value;
if (currentLength === 120) {
alert (currentLength);
}
// ...
The reason is quite simple: You check currentLength === 120
once when calling getCurrentLength
, but at that time, there is no currentLength
, because currentLength
only gets set when an input field changes.
Change your currentLength === 120
check to be inside the event handler, then you will get the expected result:
// ...
output.value = total + value;
if (currentLength === 120) {
alert (currentLength);
}
// ...
answered 2 days ago


NikxDa
2,82111531
2,82111531
I need current value (that is inside an event listener) to be assigned to global variable (that is outside of event listener). Value of global variable is used for further mathematical operations, well, I need it anyway.
– Alex
2 days ago
Yes, you are assigning the global variable. But yourif
check runs only once at the beginning, where it cannot be fulfilled yet. So either run it inside the event handlers, or add a button to run the check. With your current implementation, yourcurrentLength === 120
check will run once and fail.
– NikxDa
2 days ago
My level isn't so good, but I guess that it can be possible to do with callbacks or maybe one more event handler, isn`t it?
– Alex
2 days ago
When exactly do you want your alert to pop up? To understand your program flow, I will need more details.
– NikxDa
2 days ago
1. functiongetCurrentLength()
is called 2. I can freely take value ofcurrentLength
for manipulations with it on the levels higher. All full code, if you need, here - codepen.io/alexseveneight/pen/MZWJjR Code chaining there is: calcLength() is one of code samples that gives me needed parameter. There are several functions there with outputting parameters. Then, calling functionglobalCalc()
, I get all parameters for further operations.
– Alex
2 days ago
add a comment |
I need current value (that is inside an event listener) to be assigned to global variable (that is outside of event listener). Value of global variable is used for further mathematical operations, well, I need it anyway.
– Alex
2 days ago
Yes, you are assigning the global variable. But yourif
check runs only once at the beginning, where it cannot be fulfilled yet. So either run it inside the event handlers, or add a button to run the check. With your current implementation, yourcurrentLength === 120
check will run once and fail.
– NikxDa
2 days ago
My level isn't so good, but I guess that it can be possible to do with callbacks or maybe one more event handler, isn`t it?
– Alex
2 days ago
When exactly do you want your alert to pop up? To understand your program flow, I will need more details.
– NikxDa
2 days ago
1. functiongetCurrentLength()
is called 2. I can freely take value ofcurrentLength
for manipulations with it on the levels higher. All full code, if you need, here - codepen.io/alexseveneight/pen/MZWJjR Code chaining there is: calcLength() is one of code samples that gives me needed parameter. There are several functions there with outputting parameters. Then, calling functionglobalCalc()
, I get all parameters for further operations.
– Alex
2 days ago
I need current value (that is inside an event listener) to be assigned to global variable (that is outside of event listener). Value of global variable is used for further mathematical operations, well, I need it anyway.
– Alex
2 days ago
I need current value (that is inside an event listener) to be assigned to global variable (that is outside of event listener). Value of global variable is used for further mathematical operations, well, I need it anyway.
– Alex
2 days ago
Yes, you are assigning the global variable. But your
if
check runs only once at the beginning, where it cannot be fulfilled yet. So either run it inside the event handlers, or add a button to run the check. With your current implementation, your currentLength === 120
check will run once and fail.– NikxDa
2 days ago
Yes, you are assigning the global variable. But your
if
check runs only once at the beginning, where it cannot be fulfilled yet. So either run it inside the event handlers, or add a button to run the check. With your current implementation, your currentLength === 120
check will run once and fail.– NikxDa
2 days ago
My level isn't so good, but I guess that it can be possible to do with callbacks or maybe one more event handler, isn`t it?
– Alex
2 days ago
My level isn't so good, but I guess that it can be possible to do with callbacks or maybe one more event handler, isn`t it?
– Alex
2 days ago
When exactly do you want your alert to pop up? To understand your program flow, I will need more details.
– NikxDa
2 days ago
When exactly do you want your alert to pop up? To understand your program flow, I will need more details.
– NikxDa
2 days ago
1. function
getCurrentLength()
is called 2. I can freely take value of currentLength
for manipulations with it on the levels higher. All full code, if you need, here - codepen.io/alexseveneight/pen/MZWJjR Code chaining there is: calcLength() is one of code samples that gives me needed parameter. There are several functions there with outputting parameters. Then, calling function globalCalc()
, I get all parameters for further operations.– Alex
2 days ago
1. function
getCurrentLength()
is called 2. I can freely take value of currentLength
for manipulations with it on the levels higher. All full code, if you need, here - codepen.io/alexseveneight/pen/MZWJjR Code chaining there is: calcLength() is one of code samples that gives me needed parameter. There are several functions there with outputting parameters. Then, calling function globalCalc()
, I get all parameters for further operations.– Alex
2 days ago
add a comment |
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Qf0CvtNZY C63SqJuCz pwAT8BuJ5CP O3DF11Otmx52QUWs jw0MXjRunw,i kWrvUfHHXddRk673YC,F,m4cQtzGdk,2AjI
3
Your
if(currentLength === 120)
block runs exactly once at the very start, then never again. So even ifcurrentLength
ends up being 120, the alert won't show.currentLength
does change its value all the time, it's always one digit behind what I type in the first input for instance. How is this supposed to work exactly? Is this about adding all input values together?– Chris G
2 days ago
You also have two functions but you only call them once, which makes it kinda superfluous to have a function in the first place. I tried to clean up the code: jsfiddle.net/khrismuc/rsdgc503
– Chris G
2 days ago
I need current value (that is inside an event listener) to be assigned to global variable (that is outside of event listener). Value of global variable is used for further mathematical operations
– Alex
2 days ago
What concerns the code above: 1. Result of all input values isn`t a current result, it summarizes all entered values between each other. 2. I have several mathematical operations that have result used each for next mathematical operations, well, I do it using functions otherwise it will be very unstructured...
– Alex
2 days ago