javascript（greasemonkey）如何访问新创建的iframe

Question

i have this website, by clicking on certain link on the website an iframe will be created within the same window.

my question, just wondering how to access this iframe? i tried document.getElementById() return null tried window.frames not there

Thanks

Answer 1

If you've given the <iframe> element an ID then document.getElementById() will work. If you're trying to get hold of its window object then you'll need to use the iframe element's contentWindow property (or use the more standard contentDocument , which is a reference to the iframe's document object but is sadly absent from IE, at least up to and including version 7):

var iframe = document.getElementById("your_iframe_id");
var iframeWin, iframeDoc;
if (iframe.contentDocument) {
    iframeDoc = iframe.contentDocument;
    iframeWin = iframeDoc.defaultView;
} else if (iframe.contentWindow) {
    iframeWin = iframe.contentWindow;
    iframeDoc = iframeWin.document;
}