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DataList update from jquery

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My idea is change the datalist based on Textbox.

# when textbox is empty, I want to display "initial,always"

# when textbox is select "initial or awlays" and datalist should show "LHS,RHS".

# again the textbox is empty, I want to show "initial,always".


Here the second scenario is showing only "initial" and when Textbox empty it showing "initial,always,LHS,RHS".

can you please give me some hint?


        JQuery | Set value of input text.
    <script src=
<body style="text-align: center;">
    <input id="input" list="anrede" />
    <datalist id="anrede">
        var mycars = new Array();
        var block = new Array();
        mycars[0] = 'initial';
        mycars[1] = 'always';
        block[0] = 'LHS';
        block[1] = 'RHS';

        var options = '';

        $("#input").click(function(event) {
            var option = '';
            if ($('#input').val()=='') {
                for(var i = 0; i < mycars.length; i++)
                    options += '<option value="'+mycars+'" />';
            } else if ($('#input').val()=='initial') {
                for(var ii = 0; ii < block.length; ii++) {
                    options += '<option value="'+block[ii]+'" />';

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