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Asked: 2026-05-11T10:15:36+00:00

I have an HTML file with a couple of external JavaScript files. Here’s an

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I have an HTML file with a couple of external JavaScript files. Here’s an example, somewhat simplified from the real HTML and JavaScript files:

<head>   <title>Control Page</title>   <script language='JavaScript' src='control.js'></script>   <script language='JavaScript'>     var myWindow;     var controlForm;      function onPageLoad() {       myWindow     = document.getElementById('iframe1');       controlForm  = document.getElementById('ControlForm');     }   </script> </head> <body onLoad='onPageLoad()'>   .... </body> </html>

and then in my JavaScript file control.js:

function messageArrival(message) {     chatwindow.contentWindow.document.write(message) }  function makeNetMeetingCall() {   controlForm.Status.value = .... }  ....

My question: When I validate the external JavaScript file, it complains about the variables that are defined in the main HTML file because they aren’t declared anywhere in the *.js file. For example, MyEclipse’s JavaScript editor complains that it sees variables used that are not defined in any visible scope. How can I declare these variables in the JavaScript file so that it’s clear the variables are expected to be defined externally, something similar to ‘extern‘ in C.

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1 Answer

  1. This sounds more like an issue with MyEclipse’s JS editor than your JS.

    Unfortunately, I’m not familiar with MyEclipse. However, I do know of a good JS validator, JSLint, which accounts for global variables by having you define them in the comments:

    /*global getElementByAttribute, breakCycles, hanoi */
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