Access iFrame URL with JQuery / Javascript

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I have a page like this...


<iframe id=\"littleBox\">
</div>
</code></pre>

<p>and I want to do this...<         
<script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<ins class="adsbygoogle"
     style="display:block"
     data-ad-client="ca-pub-5408099190056760"
     data-ad-slot="7305827575"
     data-ad-format="auto"
     data-full-width-responsive="true"></ins>
<script>
     (adsbygoogle = window.adsbygoogle || []).push({});
</script>        </div>
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                <span>2021-02-11 08:16</span>
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<pre><code>document.getElementById('mainContent').contentWindow.location.href
</code></pre>
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                <span>2021-02-11 08:19</span>
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<p>As Azmisov says iframe.src does the trick</p>

<pre><code>&lt;head runat="server"&gt;
    &lt;title&gt;iframe Test&lt;/title&gt;
    &lt;script type="text/javascript"&gt;
        function ShowURLs() {
            var control = document.getElementById("mainContent");
            alert("iframe source = " + control.src);
            alert("this page = " + location.href);
        }
    &lt;/script&gt;
&lt;/head&gt;
&lt;body&gt;
    &lt;form id="form1" runat="server"&gt;
    &lt;div&gt;
        &lt;input type="button" id="someButton" value="Click Me" onclick="ShowURLs()" /&gt;
        &lt;div&gt;
            &lt;iframe id="mainContent" src="Test.aspx" /&gt;
            &lt;iframe id="littleBox" /&gt;
        &lt;/div&gt;
    &lt;/div&gt;
    &lt;/form&gt;
&lt;/body&gt;
</code></pre>
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                <span>2021-02-11 08:21</span>
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<p>Okay so you mean you have to access the URL of the parent from the child iframe?</p>

<pre><code>$("#mainFrame").get(0).contentWindow.location
</code></pre>
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                <span>2021-02-11 08:40</span>
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<p>Does iframe.src not work? Or, are you trying to get the parent document? In that case, you can just use <code>parent</code>.</p>
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<script type="text/javascript" src="https://www.e-learn.cn/qa/static/js/neweditor/ueditor.config.js"></script>
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<script type="text/plain" id="editor"  name="content"  style="width:100%;height:200px;"></script>                                 
<script type="text/javascript">
                                 var isueditor=1;
            var editor = UE.getEditor('editor',{
                //这里可以选择自己需要的工具按钮名称,此处仅选择如下五个
                toolbars:[['source','fullscreen',  '|', 'undo', 'redo', '|', 'bold', 'italic', 'underline', 'fontborder', 'strikethrough', 'removeformat', 'formatmatch', 'autotypeset', 'blockquote', 'pasteplain', '|', 'forecolor', 'backcolor', 'insertorderedlist', 'insertunorderedlist', 'selectall', 'cleardoc', '|', 'rowspacingtop', 'rowspacingbottom', 'lineheight', '|', 'customstyle', 'paragraph', 'fontfamily', 'fontsize', '|', 'indent', '|', 'justifyleft', 'justifycenter', 'justifyright', 'justifyjustify', '|', 'link', 'unlink', 'anchor', '|', 'simpleupload', 'insertimage', 'scrawl', 'insertvideo', 'attachment', 'map', 'insertcode', '|', 'horizontal', '|', 'preview', 'searchreplace', 'drafts']],
            
                initialContent:'',
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                zIndex:2,
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                initialFrameHeight:250
                //更多其他参数，请参考ueditor.config.js中的配置项
                //更多其他参数，请参考ueditor.config.js中的配置项
            });
                        editor.ready(function() {
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            	});
                            $("#editor").find("*").css("max-width","362px");
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