What am I doing wrong in the code below that I'm not able to get a reference to the footer div?
<html>
<title></title>
<head></head>
<body>
<script>alert(document.getElementById('footer'));</script>
<div id="footer">testing footer</div>
</body>
</html>
you are calling getElementById() before the footer is loaded.
put the script at the bottom of the body or run in onload
Place the script tag below the div you are trying to select. I'm guessing the alert is returning null?
Change it to:
<script type="text/javascript">alert(document.getElementById('footer').innerHTML);</script>
And put it after the DIV.
Note, the innerHTML is assuming you're just trying to get the text from within that div.
Should be
<html>
<title></title>
<head></head>
<body>
<div id="footer">testing footer</div>
<script>alert(document.getElementById('footer'));</script>
</body>
</html>
The script tag i located before the footer and thus will be executed before the footer is created.
There are couple of things that you can do:
place script below footer.
add the deferred attribute to script
attach to onload event
Related
This question already has answers here:
Why does jQuery or a DOM method such as getElementById not find the element?
(6 answers)
Closed 9 years ago.
I'm trying to get the element with getElementById(), but it returns null even though the element exists. What am I doing wrong?
<html>
<head>
<title>blah</title>
<script type="text/javascript">
alert(document.getElementById("abc"));
</script>
</head>
<body>
<div id="abc">
</div>
</body>
You have to put this in a document load event. The DOM hasn't gotten to abc by the time the script is executed.
Your script runs before the DOM has been loaded. To fix this you can place your code in the window.onload function like so:
window.onload = function() {
alert(document.getElementById("abc"));
};
An alternative is to place your script right before the closing </body> tag.
If you don't want to attach to the load event then simply put your script at the bottom of the body, so it will execute at the end-
<html>
<head>
<title>blah</title>
</head>
<body>
<div id="abc">
</div>
<script type="text/javascript">
alert(document.getElementById("abc"));
</script>
</body>
</html>
This is because the script runs before the page has rendered.
For proof add this attribute to the body tag:
<body onload="alert(document.getElementById('abc'));" >
But it doesn't exist, not at that point in the HTML. HTML documents are parsed top-to-bottom, just like programs run. The best solution is just to put your script tag at the bottom of the page. You could also attach your JavaScript to the onload event.
When I insert this code into my file it seems to block my CSS from showing. I made a script to try and print text once the page has loaded which I am then going to use later to make a loaded bar. This is my code. All that happens is I get the text "Test" printed on my page.
<html>
<head>
<link rel="stylesheet" type="text/css" href="custom.css">
<script>
function myFunction() {
document.getElementById('index').innerHTML = "test";
}
</script>
</head>
<!-- Page Body -->
<body id="index" onload="myFunction()">
<div class="header">
<div id="headerbar"></div>
<ul id="">
</div>
</body>
</html>
When you set the innerHTML of the index element, it completely replaces everything in the body. So you no longer have the DIV with the header class, and you no longer have the DIV with the headerbar ID. There's nothing for your CSS to refer to. It's as if you had written:
<body id="index">test</body>
Well for one we have no way of knowing what your CSS does, but an issue I see is that when you are using innerHTML it overwrites existing HTML. As in everything inside the body tag is overwritten to just test text.
Caveat: My presumption is that you don't have styles on the body either.
What exactly is your CSS supposed to style when you set the innerHTML of your body element to "test" ? You're removing all other contained elements by doing this.
I guess what you wanted to do is add a text node like this:
document.body.appendChild(document.createTextNode("test"));
How to move div to before tag end body </body>. I'm using openx, I cannot change div content, because the content owned by others. I just put code javascript from openx in order to get banner I put the code after tag <body> before anyting tag in content.
And my problem is, when I put javascript from openx to generate banner I get two div parallel, which the banner in <div id="div1"> and <div id="div2"> there are in below tag <body>, I want to <div id="div1"> after tag start body <body> above anyting tag in content. And <div id="div2"> in before tag end body </body> after anyting tag.
This is I get html from openx, as below:
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<div id="div1"><img src="blablabla" /></div>
<div id="div2"><img src="blablabla" /></div>
Here is content other div id or div class,
I not define example insert after div id footer
Because this is content owned by others.
This is justexample content.
</body>
</html>
and I want to transform to as below:
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<div id="div1"><img src="blablabla" /></div>
Here is content other div id or div class,
I not define, example insert after div id footer
Because this is content owned by others.
This is justexample content.
<div id="div2"><img src="blablabla" /></div>
</body>
</html>
Because I want to put banner one above content and banner two to below content. I don't want to use CSS position: fixed.
So, possible to move tag div to before tag end body?
If possible, please help me code javascript to do it.
Thanks.
Plain simple javascript:
document.body.appendChild(document.getElementById('div2'));
To move the node you just use appendChild method.
And the demo http://jsfiddle.net/6GsbB/
Yes. You can do this way, but you need jQuery.
a = $("#div2").clone();
$("#div2").remove();
$("body").append(a);
Fiddle: http://jsfiddle.net/praveenscience/zc8Ze/
Plain JavaScript method.
var a = document.getElementById("div2");
document.body.appendChild(a);
Fiddle: http://jsfiddle.net/praveenscience/zc8Ze/1/
From the comments, this can be made in a better efficient way, given by dfsq:
document.body.appendChild(document.getElementById('div2'));
I really cannot understand why this does not work. I've tried couple of tricks but I just don't get it.
<html>
<head>
<script type="text/javascript">
alert('Hey');
var vText = document.getElementById("results");
vText.innerHTML = 'Changed';
alert(vText.innerHTML);
</script>
</head>
<body>
<div id="results">
hey there
</div>
</body>
</html>
This is working as you can see here:
http://jsfiddle.net/gHbss/
It's important that you put the JavaScript after your HTML div container.
The problem that you're facing is that the browser runs the JavaScript as it's encountered when rendering/processing the page. At this point it will alert() your message, but the relevant element, the #results div isn't present in the DOM, so nothing can be changed.
To address this, you can either place the script at the end of the page, just before the closing </body> tag, or run the code in the onload event of the body or window.
The script has to be placed after the div#results or executed onload, otherwise the element is still unknown when you try to access it.
You need to call this script in onload event
i.e
window.onload=function(){
//your code
}
<html>
<head>
<script type="text/javascript">
function onloadCall()
{
alert('Hey');
var vText = document.getElementById("results");
vText.innerHTML = 'Changed';
alert(vText.innerHTML);
}
</script>
</head>
<body onload="onloadCall()">
<div id="results">
hey there
</div>
</body>
</html>
Hope the above snippet shows you the fix
I am not clear why its not working the javascript code when I add it to the header section as follows.
We can place a javascript code within the body as follows
<html>
<head>
<title> Simple Test </title>
</head>
<body>
<div id="mydiv"> This is the div content </div>
<script type="text/javascript" >
document.getElementById("mydiv").innerHTML=Date();
</script>
</body>
</html>
But when I place the same JavaScript code in the header section it doesn't work.
<html>
<head>
<title> Simple Test </title>
<script type="text/javascript" >
document.getElementById("mydiv").innerHTML=Date();
</script>
</head>
Can Someone please explain the issue. I know I can Write a JavaScript function in header and call it in an event. But can't we Use in this way. If Can't why.
<html>
<head>
<title> Simple Test </title>
<script type="text/javascript" >
window.onload= function (){document.getElementById("mydiv").innerHTML=Date();}
</script>
</head>
I think above code will help you to solve your problem. You can try this one.
because when the page is loaded, by the time the browser gets to that <script> element, the #mydiv element has not yet been created.
either use an "onload" event, or put your scripts at the bottom of the page.
It's because the page is being rendered in the order it's read. Therefore when the script in the header is evaluated the rest of the page hasn't been rendered yet (ie the myDiv element hasn't been created).
When you create an event handler in the head that works fine - the handler is set up before the rest of the page is loaded but the event can't happen until the element exists.
When you put it in the <head>, it runs before the <body> exists.
this is because of the page rendering order.you can access elements before it has been created. if you can, try to put all JavaScript code end of the page(before closing body tag). it will save your page load time. if you cannot put it in the bottom, put the code inside onload event.