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Editorial Team
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Asked: 2026-06-05T18:23:51+00:00

We need to add a javascript element inside an iframe (its inside the same

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We need to add a javascript element inside an iframe (its inside the same web/domain so no security problems attached). We got it working but dont know how to fill the script content betwen its tags…how would you do it? 

var iframe = document.getElementById('iframeX');
var iframedocument = iframe.contentWindow.document;

var script = iframedocument.createElement('script');

script.setAttribute('type', 'text/javascript');
script.innerText = 'alert(\'hello\')'; //this doesnt work
script.value= 'alert(\'hello\')'; //this doesnt work either

var head = iframedocument.getElementsByTagName("head")[0];

head.appendChild(script);

Desired result in the iframe document:

<head>
    <script type="text/javascript" >
        alert('hello');
    </script>
</head>
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1 Answer

  1. Editorial Team

    Did you try:

    script.setAttribute('type', 'text/javascript');
script.innerHTML = 'alert(\'hello\')';
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