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问题:

How do I clear the content of my IFRAME element, using javascript, without 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.

回答1:

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.

回答2:

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 :)

回答3:

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).

回答4:

Or you can do this :

var iframe_element = window.frames['iframe_name'];
iframe_element.document.open();
iframe_element.document.close();

回答5:

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);

回答6:

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>

回答7:

// 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);

回答8:

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);

回答9:

function getContentFromIframe(iFrameName)
{
    var myIFrame = document.getElementById(iFrameName);
    var content = myIFrame.contentWindow.document.body.innerHTML;

    //Do whatever you need with the content    
}