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Editorial Team
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Asked: 2026-05-19T11:34:37+00:00

The script does window.open(”,…) and then writes xmlhttp.responseText by doing innerHTML=xmlhttp.responseText, but the script

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The script does window.open(”,…) and then writes xmlhttp.responseText by doing innerHTML=xmlhttp.responseText, but the script doesn’t load.

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1 Answer

  1. Editorial Team

    Typically, you would get the xmlhttp request response as pure Javascript and then use the Javascript eval() function:

    function callback() {
    var result = xmlHttp.responseText;
    eval(result);
}

    In this case, you would NOT treat it as HTML. Instead, you would return pure code. The difference:

    Don’t do this in your page you call

    <script type="text/javascript">
alert('xmlhttprequest loaded!');
</script>

    Do this instead

    alert('xmlhttprequest loaded!');

    So that, in effect this is what happens:

    function callback() {
    var result = xmlHttp.responseText;
    eval("alert('xmlhttprequest loaded!');");
}

    But you don’t want this to happen:

    function callback() {
    var result = xmlHttp.responseText;
    eval("<script>alert('xmlhttprequest loaded!');</script>");
}

    There are some issues associated with doing it this way, such as eval can be slow. Google javascript eval to see what others have to say.

    === EDIT ===

    Using a DOM method as opposed to xmlhttprequest may actually be what the original poster is needing to do here, which is load a Google captcha code dynamically.

    <html>
<head></head>
<body>
<script type="text/javascript">

var head = document.getElementsByTagName('head')[0];
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = "http://google.com/captcha/location";
head.appendChild(script);

</script>
</body>
</html>

    Additionally, if you need it to land somewhere, you can do something like:

    <html>
<head></head>
<body>
<div id="captcha">
</div>
<script type="text/javascript">

var captcha = document.getElementById('captcha');
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = "http://google.com/captcha/location";
captcha.appendChild(script);

</script>
</body>
</html>
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