iFrame onload JavaScript event

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I have an iFrame, where I want to send a JavaScript command after loading. My current code looks like this:
</script>
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                <span>2020-11-28 12:08</span>
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<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>document.querySelector("iframe").addEventListener( "load", function(e) {

    this.style.backgroundColor = "red";
    alert(this.nodeName);

    console.log(e.target);

} );</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;iframe src="example.com" &gt;&lt;/iframe&gt;</code></pre>
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                <span>2020-11-28 12:09</span>
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<p>Your code is correct. Just test to ensure it is being called
like:</p>

<pre><code>&lt;script&gt;
function doIt(){
  alert("here i am!");
  __doPostBack('ctl00$ctl00$bLogout','')
}
&lt;/script&gt;

&lt;iframe onload="doIt()"&gt;&lt;/iframe&gt;
</code></pre>
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                <span>2020-11-28 12:33</span>
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<p>Use the iFrame's <code>.onload</code> function of JavaScript:</p>

<pre><code>&lt;iframe id="my_iframe" src="http://www.test.tld/"&gt;
    &lt;script type="text/javascript"&gt;
        document.getElementById('my_iframe').onload = function() {
            __doPostBack('ctl00$ctl00$bLogout','');
        }
    &lt;/script&gt;
    &lt;!--OTHER STUFF--&gt;
&lt;/iframe&gt;
</code></pre>
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