Validating multiple checkboxes using javascript

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I tested your first piece of code on a form and it does not work at all.

Basically I want to validate both check box lists with one method and one function. One suggestion is to add the checkboxlist control id to your customvalidator id and then retrieve the value in javascript function.

Javascript AIUI, if one wants to retain the client's business, one heeds the client's demands, where insistent.

IIRC, you have previously indicated much the same yourself.

In more complicated forms you will want to set conditions on the form that combine multiple elements.

For example, a text input that only needs to have a value if a checkbox is checked: Using simple logical operators and the functions supplied above you can do all sorts of client-side form validation.

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