When I refresh the page below in FF 3.0, I expected the web page to clear but it didn't.
Why doesn't document.body.innerHTML = "" clear the page?
UPDATE: I am trying to clear the previous screen during a refresh while the new page is loading. I actually want to see the page clear, wait and then the next js running. I don't want to clear the screen after the page has loaded.
...
<body>
<script type="text/javascript">
document.body.innerHTML = "";
for (var i = 0; i < 1000000000; i++) {
}
</script>
<img src="images/web.gif" /><br />
<script type="text/javascript">
document.write( "hello<br />");
</script>
<img src="images/warning.png" /><br />
</body>
This question is related to
javascript
firefox
dom
innerhtml
I'm not sure what you're trying to achieve, but you may want to consider using jQuery, which allows you to put your code in the head tag or a separate script file and still have the code executed after the DOM has loaded.
You can then do something like:
$(document).ready(function() {
$(document).remove();
});
as well as selectively removing elements (all DIVs, only DIVs with certain classes, etc.)
I clear my screen using is function that
var clear_body = function (){
var lista = document.body.childNodes;
for (var i = lista.length - 1; i >= 0 ;i--){
document.body.removeChild(lista[i])
}
}
Whilst agreeing with Douwe Maan and Erik's answers, there are a couple of other things here that you may find useful.
Firstly, within your head tags, you can reference a separate JavaScript file, which is then reusable:
<script language="JavaScript" src="/common/common.js"></script>
where common.js is your reusable function file in a top-level directory called common.
Secondly, you can delay the operation of a script using setTimeout, e.g.:
setTimeout(someFunction, 5000);
The second argument is in milliseconds. I mention this, because you appear to be trying to delay something in your original code snippet.
As others were saying, an easy solution is to put your script at the bottom of the page, because all DOM elements are loaded synchronously from top to bottom. Otherwise, I think what you're looking for is document.onload(() => {callback_body}) or window.onload(() => {callback_body}) as Erik said. These allow you to execute you script when the dom:loaded event is fired as Douwe Maan said. Not sure about the properties of window.onload, but document.onload is triggered only after all elements, css, and scripts are loaded. In your case:
<script type="text/javascript">
document.onload(() =>
document.body.innerHTML = "";
)
</script>
or, If you are using an old browser:
<script type="text/javascript">
document.onload(function() {
document.body.innerHTML = "";
})
</script>
Using document.body.innerHTML = ''; does work! Just saying, if using HTML (DOM or on function) you can usedocument.writeln(''); but only onClick or onDoubleClick :)
To expound on Douwem's answer, in your script tag, put your code in an onload:
<script type="text/javascript">
window.onload=function(){
document.body.innerHTML = "";
}
</script>
Source: Stackoverflow.com