为什么是iframe.contentWindow == null? [英] Why is iframe.contentWindow == null?
问题描述
我使用以下代码动态创建一个iframe。
var iframe_jquery = $(< iframe>)
.addClass(foo)
.appendTo(container); // container是一个包含< div>的jQuery对象它已经存在
然后,我想访问其内容窗口,但它为null:
var iframe = iframe_jquery.get(0);
if(iframe){// iFrame exists
console.log(iframe.contentWindow); // Printsnull
var doc = iframe.contentWindow.document; // NullpointerException
}
所以我想:也许iframe还没有准备好?所以我试过:
iframe_jquery.ready(function(){
var iframe = iframe_jquery.get(0);
console.log(iframe.contentWindow); //打印null
var doc = iframe.contentWindow.document; // NullpointerException
});
相同结果
什么问题?
上周我遇到了这个问题,同时使用iFrames(构建rtf编辑器)是的,还没准备好
我以为如果我把它放在一个 .ready()
它会工作,但 .ready()
是当DOM准备好了,而不是当iFrame加载其内容时,所以我最终用jQuery .load()
所以尝试这样:
$( function(){
$(#myiframe)。load(function(){
frames [myframe]。document.body.innerHTML = htmlValue;
});
});
希望这有帮助
I use the following code to dynamically create an iframe.
var iframe_jquery = $("<iframe>")
.addClass("foo")
.appendTo(container); // container is a jQuery object containing a <div> which already exists
Then, I want to access its contentWindow, but it's null:
var iframe = iframe_jquery.get(0);
if (iframe){ // iFrame exists
console.log(iframe.contentWindow); // Prints "null"
var doc = iframe.contentWindow.document; // NullpointerException
}
So I thought: "Maybe the iframe isn't ready yet?" So I tried:
iframe_jquery.ready(function(){
var iframe = iframe_jquery.get(0);
console.log(iframe.contentWindow); // Prints "null"
var doc = iframe.contentWindow.document; // NullpointerException
});
Same result.
What's wrong?
I had this problem last week while playing with iFrames (building an rtf editor), and yeah it's not ready yet.
I thought if I put it in a .ready()
it would work, but .ready()
is when the DOM is ready, not when the iFrame has loaded its contents, so I ended up wrapping my code with jQuery .load()
.
So try this:
$(function () {
$("#myiframe").load(function () {
frames["myframe"].document.body.innerHTML = htmlValue;
});
});
Hope this helps
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