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How to tell if any check boxes are checked?
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OptimalDesigns:
I have several check boxes a user can select for various classes. If one or more check boxes are selected, then ooo . Please test it. Here is the html code at present:
--- ---</script>
function myHideShow() {
var checkboxes = document.getElementById("interest[]");
var user = document.getElementById("username");
var email = document.getElementById("email");
var submit = document.getElementById("submit");
if ((checkboxes.checked)) {
// echo("You didn't select any check boxes.");
user.disabled = true;
email.disabled = true;
submit.disabled = true; }
else {
// echo("You did select at least one check box.");
user.disabled = false;
email.disabled = false;
submit.disabled = false;
}
}
</script>
<!DOCTYPE html> <html> <head> </head> <body>
<form name='calculusclassform' method="post" action="">
<fieldset>
<legend>Choose your <b>Class</b> interests</legend>
<input type="checkbox" id="oil" name="interest[]" value="Oil Refinery Optimization" onclick="myHideShow()">
<label for="oil">Oil Refinery Optimization</label>
<span>Crude oil ...</span>
<p id="text" style="display:none">Checkbox is CHECKED!</p>
<input type="checkbox" id="curvfit" name="interest[]" value="Curve Fitting Data sets" onclick="myHideShow()">
<label for="curvfit">Curve Fitting Data sets</label>
<span>Have a curve fitting problem? ...</span>
<input type="checkbox" id="coding" name="interest[]" value="Calculus-level Coding" onclick="myHideShow()">
<label for="coding">Calculus-level Coding</label>
<span> languages ... </span>
<h3>Classes are free, but in return, we ask you to share these class offerings with 5+ others. Thanks.</h3>
<span> Name:</span>
<input type="name" name="username" id="username" disabled><br>
Email Address:
<input type="email" name="email" id="email" disabled><br><br>
<input type="submit" value="Submit" id="submit" disabled>
</fieldset>
</form>
</body> </html>
Running this JS script code if ((checkboxes.checked)) is my problem. Ideas? Trying to test if any checkboxes are checked.
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