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Thread: Swap values of DropDownList

  1. #1
    Join Date
    Jun 2010
    Posts
    9

    Swap values of DropDownList

    I have three DropDownList, all have values of 1,2 and 3...

    DropDownList1 has a selected value of 1

    DropDownList2 has a selected value of 3

    DropDownList3 has a selected value of 2


    What I want is to swap values.

    i.e. if I selected number 2 in DropDownList1, DropDownList3 should select 1 automatically.

  2. #2
    Join Date
    Jul 2007
    Posts
    386
    This is an example. You can use as many selects as you want:

    Code:
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html lang="en" xmlns="http://www.w3.org/1999/xhtml">
    <head>
    <title>Test</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <style type="text/css">
    
    </style>
    <script type="text/javascript">
    var storedValues = [];
    
    function swap(obj)
    {
        var sels = document.getElementById('groupSel').getElementsByTagName('select');
        
        for (var i = 0; l = sels.length, i < l; i++)
        {
            if (sels[i].id != obj.id && sels[i].value == obj.value)
            {
                var opts = sels[i].getElementsByTagName('option');
                
                for (var j = 0; m = opts.length, j < m; j++)
                {
                    if (opts[j].value == storedValues[obj.id])
                    {
                        opts[j].selected = 'true'
                        break;
                    }
                }
                
                break;
            }
        }
    }
    
    function store(obj)
    {
        storedValues[obj.id] = obj.value;
    }
    
    function init()
    {
        var sels = document.getElementById('groupSel').getElementsByTagName('select');
        
        for (var i = 0; l = sels.length, i < l; i++)
        {
            var id = 'gs_' + i;
            
            storedValues[id] = sels[i].value;
            sels[i].id = id;
            sels[i].onmouseup = function() {
                store(this);
            };
            sels[i].onchange = function() {
                swap(this);
            }
        }
    }
    </script>
    </head>
    <body onload="init();">
    
    <div id="groupSel">
        dd1: <select name="dd1">
            <option value="1" selected="true">1</option>
            <option value="2">2</option>
            <option value="3">3</option>
        </select><br/><br/>
    
        dd2: <select name="dd2">
            <option value="1">1</option>
            <option value="2">2</option>
            <option value="3" selected="true">3</option>
        </select><br/><br/>
    
        dd3: <select name="dd3">
            <option value="1">1</option>
            <option value="2" selected="true">2</option>
            <option value="3">3</option>
        </select>
    </div>
    
    </body>
    </html>

  3. #3
    Join Date
    Jun 2010
    Posts
    9
    Great..Thanks a lot.

  4. #4
    Join Date
    Apr 2013
    Posts
    1
    Hello All,
    Actually i need the same functionality to be get worked for my code also. I am using Ruby on Rails, Javascript & HTML. My problem is i am fetching the drop down list values as position from database and it repeats for number of items.
    i.e., Item 1 - Dropdown values(1,2,.......10) - 1 selected
    Item 2 - Dropdown values(1,2.......10) - 2 selected an so on.
    From the above mentioned i cannot use document.getElementById('groupSel').getElementsByTagName('select') as there is only one select in loop. sels[i].onchange is also not working. Please help how can i get it worked. Its' urgent.

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