How to clear the content of an IFRAME?
How do I clear the content of my IFRAME element, using javascript, without 开发者_StackOverflow中文版loading a blank page into it?
I can figure out to do this: iframe_element.src = "blank.html", but there must be a better, instant, method.
about:blank
is a "URL" that is blank. It's always clear
You can set the page's source to that, and it will clear.
var iframe = document.getElementById("myiframe");
var html = "";
iframe.contentWindow.document.open();
iframe.contentWindow.document.write(html);
iframe.contentWindow.document.close();
tested in IE, Firefox and Chrome ... it did it :)
Your technique is the most robust. Its the one I use myself. At times content may be delivered over HTTPS and the use of about:blank can cause warning messages to appear to the effect of "do you want to include content from unsecure location" or some such thing.
Something being instant is a matter of perception however if you have a single Blank.html file on your site configured with a long cache expiry the client will only ever fetch the page once (at the most once per-session).
Or you can do this :
var iframe_element = window.frames['iframe_name'];
iframe_element.document.open();
iframe_element.document.close();
I have had difficulties with "about:blank" on pages with many IFrames. It does not seem to be a valid location in every browser (I never found out for sure, though). Anyway, I am happy with javascript:void(0);
You could also do this:
<html>
<head>
<script>
var doc = null;
window.onload = function() {
alert("Filling IFrame");
doc = document.getElementById("test");
if( doc.document ) {
document.test.document.body.innerHTML = "<h1>test</h1>"; //Chrome, IE
}else {
doc.contentDocument.body.innerHTML = "<h1>test</h1>"; //FireFox
}
setTimeout(function() {
alert("Clearing IFrame");
if( doc.document ) {
document.test.document.body.innerHTML = ""; //Chrome, IE
}else {
doc.contentDocument.body.innerHTML = ""; //FireFox
}
}, 1000);
};
</script>
</head>
<body>
<iframe id="test" name="test">
</iframe>
</body>
</html>
// First I get the window from its Id.
var my_content = document.getElementById('my_iframe').contentWindow.document;
// Then I clear it by setting the body tag inner HTML to an empty string.
my_content.body.innerHTML="";
// Now when I write my new content it does not get appended to the end of the body and the iframe body will contain only fresh content.
my_content.write(new_content);
Just do it:
var iframe = document.getElementById("iframe");
iframe.removeAttribute('srcdoc');
Work in Chrome
Just get the Iframe and remove the documentElement from it. The Iframe will be blank
var frame = document.getElementById("YourFrameId"),
frameDoc = frame.contentDocument || frame.contentWindow.document;
frameDoc.removeChild(frameDoc.documentElement);
function getContentFromIframe(iFrameName)
{
var myIFrame = document.getElementById(iFrameName);
var content = myIFrame.contentWindow.document.body.innerHTML;
//Do whatever you need with the content
}
$("#iframe").contents().find("body").html('');
加载中,请稍侯......
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