How to fix “Cannot read property 'getElementsByClassName' of null” error in JavaScript [duplicate]Why does jQuery or a DOM method such as getElementById not find the element?How to validate an email address in JavaScript?How do JavaScript closures work?How to check empty/undefined/null string in JavaScript?How to change an element's class with JavaScript?How do I remove a property from a JavaScript object?How do you get a timestamp in JavaScript?How do I include a JavaScript file in another JavaScript file?How to replace all occurrences of a string in JavaScriptHow to check whether a string contains a substring in JavaScript?How do I remove a particular element from an array in JavaScript?
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How to fix “Cannot read property 'getElementsByClassName' of null” error in JavaScript [duplicate]
Why does jQuery or a DOM method such as getElementById not find the element?How to validate an email address in JavaScript?How do JavaScript closures work?How to check empty/undefined/null string in JavaScript?How to change an element's class with JavaScript?How do I remove a property from a JavaScript object?How do you get a timestamp in JavaScript?How do I include a JavaScript file in another JavaScript file?How to replace all occurrences of a string in JavaScriptHow to check whether a string contains a substring in JavaScript?How do I remove a particular element from an array in JavaScript?
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This question already has an answer here:
Why does jQuery or a DOM method such as getElementById not find the element?
6 answers
I am trying to learn JavaScript. I have a test file, but it gives me an error.
The result should be 3 empty divs.
Error: Cannot read property 'getElementsByClassName' of null
I've tried debugging and changing item=template.getElementsByClassName("main"); to item=template.querySelectorAll("#template div");
HTML
<body>
<script src="test.js" charset="utf-8"></script>
<template id="test">
<div class="main">
<div class="">
</div>
</div>
</template>
<div class="site">
</div>
</body>
JavaScript
var template, item, site, i, a;
template=document.getElementById("test");
item=template.getElementsByClassName("main");
site=document.getElementsByClassName("site");
for(i=0; i<3; i++)
a=document.importNode(item, true);
site.appendChild(a);
javascript html html5 dom
asked Mar 23 at 9:09
RaresRares
42
marked as duplicate by Quentin html
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Mar 23 at 9:10
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
add a comment |
This question already has an answer here:
Why does jQuery or a DOM method such as getElementById not find the element?
6 answers
I am trying to learn JavaScript. I have a test file, but it gives me an error.
The result should be 3 empty divs.
Error: Cannot read property 'getElementsByClassName' of null
I've tried debugging and changing item=template.getElementsByClassName("main"); to item=template.querySelectorAll("#template div");
HTML
<body>
<script src="test.js" charset="utf-8"></script>
<template id="test">
<div class="main">
<div class="">
</div>
</div>
</template>
<div class="site">
</div>
</body>
JavaScript
var template, item, site, i, a;
template=document.getElementById("test");
item=template.getElementsByClassName("main");
site=document.getElementsByClassName("site");
for(i=0; i<3; i++)
a=document.importNode(item, true);
site.appendChild(a);
javascript html html5 dom
asked Mar 23 at 9:09
RaresRares
42
marked as duplicate by Quentin html
Users with the html badge can single-handedly close html questions as duplicates and reopen them as needed.
StackExchange.ready(function()
if (StackExchange.options.isMobile) return;
$('.dupe-hammer-message-hover:not(.hover-bound)').each(function()
var $hover = $(this).addClass('hover-bound'),
$msg = $hover.siblings('.dupe-hammer-message');
$hover.hover(
function()
$hover.showInfoMessage('',
messageElement: $msg.clone().show(),
transient: false,
position: my: 'bottom left', at: 'top center', offsetTop: -7 ,
dismissable: false,
relativeToBody: true
);
,
function()
StackExchange.helpers.removeMessages();
);
);
);
Mar 23 at 9:10
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
add a comment |
This question already has an answer here:
Why does jQuery or a DOM method such as getElementById not find the element?
6 answers
I am trying to learn JavaScript. I have a test file, but it gives me an error.
The result should be 3 empty divs.
Error: Cannot read property 'getElementsByClassName' of null
I've tried debugging and changing item=template.getElementsByClassName("main"); to item=template.querySelectorAll("#template div");
HTML
<body>
<script src="test.js" charset="utf-8"></script>
<template id="test">
<div class="main">
<div class="">
</div>
</div>
</template>
<div class="site">
</div>
</body>
JavaScript
var template, item, site, i, a;
template=document.getElementById("test");
item=template.getElementsByClassName("main");
site=document.getElementsByClassName("site");
for(i=0; i<3; i++)
a=document.importNode(item, true);
site.appendChild(a);
javascript html html5 dom
asked Mar 23 at 9:09
RaresRares
42
This question already has an answer here:
Why does jQuery or a DOM method such as getElementById not find the element?
6 answers
I am trying to learn JavaScript. I have a test file, but it gives me an error.
The result should be 3 empty divs.
Error: Cannot read property 'getElementsByClassName' of null
I've tried debugging and changing item=template.getElementsByClassName("main"); to item=template.querySelectorAll("#template div");
HTML
<body>
<script src="test.js" charset="utf-8"></script>
<template id="test">
<div class="main">
<div class="">
</div>
</div>
</template>
<div class="site">
</div>
</body>
JavaScript
var template, item, site, i, a;
template=document.getElementById("test");
item=template.getElementsByClassName("main");
site=document.getElementsByClassName("site");
for(i=0; i<3; i++)
a=document.importNode(item, true);
site.appendChild(a);
This question already has an answer here:
Why does jQuery or a DOM method such as getElementById not find the element?
6 answers
javascript html html5 dom
javascript html html5 dom
asked Mar 23 at 9:09
RaresRares
42
asked Mar 23 at 9:09
RaresRares
42
edited Mar 23 at 9:22
Rares
asked Mar 23 at 9:09
RaresRares
42
asked Mar 23 at 9:09
RaresRares
42
asked Mar 23 at 9:09
RaresRares
42
42
marked as duplicate by Quentin html
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$hover.hover(
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$hover.showInfoMessage('',
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transient: false,
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dismissable: false,
relativeToBody: true
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StackExchange.helpers.removeMessages();
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Mar 23 at 9:10
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
marked as duplicate by Quentin html
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$('.dupe-hammer-message-hover:not(.hover-bound)').each(function()
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messageElement: $msg.clone().show(),
transient: false,
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dismissable: false,
relativeToBody: true
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This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
add a comment |
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1 Answer
1
active
oldest
votes
The reason it's not working is cause youre trying to fetch 3 elements who's class name is "main". But only 1 exists that's why it complains that it cannot read the property of something that does not exist. So I've updated the code to fetch the 3 empty divs
Additionally the last div is the site div, and you're trying to add elements to it. You'll run into a problem where you will try to add itself to itself. I've updated the code slightly so you don't run into this problem
var template, item, site, i, a;
template=document.getElementById("test");
item=template.querySelectorAll("#template div");
site=document.getElementsByClassName("site")[0];
for(i=0; i<item.length; i++)
a=document.importNode(item, true);
site.appendChild(a);
answered Mar 23 at 9:17
Craig WayneCraig Wayne
2,39732235
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
The reason it's not working is cause youre trying to fetch 3 elements who's class name is "main". But only 1 exists that's why it complains that it cannot read the property of something that does not exist. So I've updated the code to fetch the 3 empty divs
Additionally the last div is the site div, and you're trying to add elements to it. You'll run into a problem where you will try to add itself to itself. I've updated the code slightly so you don't run into this problem
var template, item, site, i, a;
template=document.getElementById("test");
item=template.querySelectorAll("#template div");
site=document.getElementsByClassName("site")[0];
for(i=0; i<item.length; i++)
a=document.importNode(item, true);
site.appendChild(a);
answered Mar 23 at 9:17
Craig WayneCraig Wayne
2,39732235
add a comment |
The reason it's not working is cause youre trying to fetch 3 elements who's class name is "main". But only 1 exists that's why it complains that it cannot read the property of something that does not exist. So I've updated the code to fetch the 3 empty divs
Additionally the last div is the site div, and you're trying to add elements to it. You'll run into a problem where you will try to add itself to itself. I've updated the code slightly so you don't run into this problem
var template, item, site, i, a;
template=document.getElementById("test");
item=template.querySelectorAll("#template div");
site=document.getElementsByClassName("site")[0];
for(i=0; i<item.length; i++)
a=document.importNode(item, true);
site.appendChild(a);
answered Mar 23 at 9:17
Craig WayneCraig Wayne
2,39732235
add a comment |
The reason it's not working is cause youre trying to fetch 3 elements who's class name is "main". But only 1 exists that's why it complains that it cannot read the property of something that does not exist. So I've updated the code to fetch the 3 empty divs
Additionally the last div is the site div, and you're trying to add elements to it. You'll run into a problem where you will try to add itself to itself. I've updated the code slightly so you don't run into this problem
var template, item, site, i, a;
template=document.getElementById("test");
item=template.querySelectorAll("#template div");
site=document.getElementsByClassName("site")[0];
for(i=0; i<item.length; i++)
a=document.importNode(item, true);
site.appendChild(a);
answered Mar 23 at 9:17
Craig WayneCraig Wayne
2,39732235
The reason it's not working is cause youre trying to fetch 3 elements who's class name is "main". But only 1 exists that's why it complains that it cannot read the property of something that does not exist. So I've updated the code to fetch the 3 empty divs
Additionally the last div is the site div, and you're trying to add elements to it. You'll run into a problem where you will try to add itself to itself. I've updated the code slightly so you don't run into this problem
var template, item, site, i, a;
template=document.getElementById("test");
item=template.querySelectorAll("#template div");
site=document.getElementsByClassName("site")[0];
for(i=0; i<item.length; i++)
a=document.importNode(item, true);
site.appendChild(a);
answered Mar 23 at 9:17
Craig WayneCraig Wayne
2,39732235
answered Mar 23 at 9:17
Craig WayneCraig Wayne
2,39732235
answered Mar 23 at 9:17
Craig WayneCraig Wayne
2,39732235
answered Mar 23 at 9:17
Craig WayneCraig Wayne
2,39732235
2,39732235
add a comment |
add a comment |
