Drop-down box dependent on the option selected in another drop-down box

    function dropdownlist(listindex)
    {
         document.getElementById("ddlCity").options.length = 0;
         switch (listindex) 
         {
             case "Karnataka":
                     document.getElementById("ddlCity").options[0] = new Option("--select--", "");
                     document.getElementById("ddlCity").options[1] = new Option("Dharawad", "Dharawad");
                     document.getElementById("ddlCity").options[2] = new Option("Haveri", "Haveri");
                     document.getElementById("ddlCity").options[3] = new Option("Belgum", "Belgum");
                     document.getElementById("ddlCity").options[4] = new Option("Bijapur", "Bijapur");

                 break;

             case "Tamilnadu":
                 document.getElementById("ddlCity").options[0] = new Option("--select--", "");
                 document.getElementById("ddlCity").options[1] = new Option("dgdf", "dgdf");
                 document.getElementById("ddlCity").options[2] = new Option("gffd", "gffd");


                 break;
         }

    }

* State: --Select-- Karnataka Tamilnadu Andra pradesh Telngana 

    <div>
        <p>

            <label id="lblCt">
            <span class="red">*</span>
                City:</label>
            <select id="ddlCity">
               <!-- <option>--Select--</option>
                <option value="1">Dharawad</option>
                <option value="2">Belgum</option>
                <option value="3">Bagalkot</option>
                <option value="4">Haveri</option>
                <option>Hydrabadh</option>
                <option>Vijat vada</option>-->
            </select>
            <label id="lblCity"></label>
        </p>
    </div>

Try something like this... jsfiddle demo

HTML

<!-- Source: -->
<select id="source" name="source">
     <option>MANUAL</option>
     <option>ONLINE</option>
</select>

<!-- Status: -->
<select id="status" name="status">
    <option>OPEN</option>
    <option>DELIVERED</option>
</select>

JS

$(document).on('ready', function () {

    $("#source").on('change', function () {
        var el = $(this);
        if (el.val() === "ONLINE") {
            $("#status").append("<option>SHIPPED</option>");
        } else if (el.val() === "MANUAL") {
            $("#status option:last-child").remove();
        }
    });

});

I am posting this answer because in this way you will never need any plugin like jQuery and any other, This has the solution by simple javascript.

<html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <script language="javascript" type="text/javascript">
    function dynamicdropdown(listindex)
    {
        switch (listindex)
        {
        case "manual" :
            document.getElementById("status").options[0]=new Option("Select status","");
            document.getElementById("status").options[1]=new Option("OPEN","open");
            document.getElementById("status").options[2]=new Option("DELIVERED","delivered");
            break;
        case "online" :
            document.getElementById("status").options[0]=new Option("Select status","");
            document.getElementById("status").options[1]=new Option("OPEN","open");
            document.getElementById("status").options[2]=new Option("DELIVERED","delivered");
            document.getElementById("status").options[3]=new Option("SHIPPED","shipped");
            break;
        }
        return true;
    }
    </script>
    </head>
    <title>Dynamic Drop Down List</title>
    <body>
    <div class="category_div" id="category_div">Source:
        <select id="source" name="source" onchange="javascript: dynamicdropdown(this.options[this.selectedIndex].value);">
        <option value="">Select source</option>
        <option value="manual">MANUAL</option>
        <option value="online">ONLINE</option>
        </select>
    </div>
    <div class="sub_category_div" id="sub_category_div">Status:
        <script type="text/javascript" language="JavaScript">
        document.write('<select name="status" id="status"><option value="">Select status</option></select>')
        </script>
        <noscript>
        <select id="status" name="status">
            <option value="open">OPEN</option>
            <option value="delivered">DELIVERED</option>
        </select>
        </noscript>
    </div>
    </body>
</html>

For more details, I mean to make dynamic and more dependency please take a look at my article create dynamic drop-down list

Tags:

Javascript

Html

Forms

Jquery

Drop Down Menu

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