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Editorial Team
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Asked: 2026-05-24T20:25:17+00:00

Is there any event handler before onLoad/onPageShow? The trouble with onLoad is if there

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Is there any event handler before onLoad/onPageShow? The trouble with onLoad is if there is any change in display, the page will show up without change until it is fully loaded, then the script will run. What is the best way to make sure it will run as soon as possible?

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1 Answer

  1. Editorial Team

    If you put Javascript statements (rather than function definitions) inside a <script> tag, they will be executed during page loading – before the onLoad event is fired.

     <html>
 <body>
   <h2>First header</h2>
   <script type="text/javascript">
     alert("Hi, I am here"); 
     document.write("<h3>This is Javascript generated</h3>");
   </script>
   <h2>Second header</h2>
 </body>
 </html>

    The caveat is that you cannot search for elements by ID because these element might not have been rendered yet, so your ability to change the page that way is limited.

    Bottom line: possible, not recommended.

    What I usually do in such situations is as follows:

    • Make the parts of the page that may change invisible (via style="visibility:hidden;");
    • Make onLoad run a Javascript code that changes the page and then sets the visibility of the said parts to visibility:visible.
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