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  • Dropdown Menu Blank Option Validator
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  • Dropdown menus allow for directed input into your applications. Many times the first choice in the option list may be a title or define the options after it, so you really would not want that as input. Also, to ensure consistent length or to format the dropdown menus better blanks or options with multiple dashes are used. The following example lists four valid choices (A,B,C,D) and two for formatting (the top and bottom choices) When a selection that has a blank option is chosen an alert box will appear directing the user to make another selection from the options available.
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    <html>
    <title>CodeAve.com(JavaScript: Blank Dropdown Option Validator)</title>
    <body bgcolor="#FFFFFF">


    <script Language="JavaScript">
    <!--
    function dropdown_validator()
    {
    if (dropdown_form.dropdown_name.value == "")
    {
    alert("Please select one of the choices.");
    dropdown_form.dropdown_name.focus();
    return (false);
    }

    return (true);
    }
    -->
    </script>

    <form method="get" action="http://www.codeave.com/html/get.asp" 
    onsubmit="return dropdown_validator()" name="dropdown_form">
    <select size="1" name="dropdown_name">
    <option>Select A Letter</option>
    <option value="A">A</option>
    <option value="B">B</option>
    <option value="C">C</option>
    <option value="D">D</option>
    <option value="E">E</option>
    <option value="F">F</option>
    <option value="">-------------------------</option>
    </select>
    <input type="submit" value="Submit">
    </form>

    </body>
    </html>

     

     

     



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