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I am trying to make the price field change the value to 0 and disable it from a drop down box selection.  Here is my code.  I want to make it so when the user selects the "free" option the text box "price"'s value changes to 0 and becomes disabled.  Thanks.

 

Category: <select size="1" name="category">
    <option value="1">Automotives</option>
    <option value="2">Computers and Electronics</option>
    <option value="3">Free</option>
    <option value="4">Others</option>
Price: 
<input type="text" name="price" size="3">

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https://forums.phpfreaks.com/topic/112272-solved-simple-drop-down-box-script/
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