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Get dropdown previous value in jquery

Posted on 2011-02-17
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Last Modified: 2012-05-11
Hi,

How to get previous selected dropdown value in jquery.
I tried $(this).prev().val() --> but it returns me undefined.

below is my code.

 <%: Html.DropDownListFor(model => model.ViewModel.StyleId,Html.StyleSelectListItems(ViewData["HouseTypeID"].ToString()),new { style = "width: 100%;",Class = "homeStyle" })%>
                                   

when i change it fire below method

 $("#ViewModel_StyleId").change(function (e) {

}

i tried below code, but doesn't help me.

$(this).prev().val();
$("#ViewModel_StyleId).prev().val();
0
Comment
Question by:kravindra
  • 2
4 Comments
 
LVL 40

Expert Comment

by:Gurvinder Pal Singh
ID: 34914139
$(this).prev().val() will only give the previous sibling's value, not the previous value of drop down.

You need to store the old value somewhere so that next time you can just fetch it from there.

You can use stack here, so that any time the value is changed, it will be pushed to the stack
0
 
LVL 20

Accepted Solution

by:
Proculopsis earned 2000 total points
ID: 34914540

Are you after something like this:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<title>http://www.experts-exchange.com/Programming/Languages/Scripting/JavaScript/Q_26827824.html</title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">

jQuery(document).ready( function () {

  var previousValue = $("#ViewModel_StyleId").val();

  $("#ViewModel_StyleId").change( function() {
    $("#previous").text( previousValue );
    previousValue = $("#ViewModel_StyleId").val();
  });

});

</script>
</head>
<body>

<select id="ViewModel_StyleId">
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
<option>6</option>
<option>7</option>
<option>8</option>
<option>9</option>
</select>

Previous value: <span id="previous"></span>

</body>
</html>

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0
 
LVL 83

Expert Comment

by:leakim971
ID: 34915386
Another one using  : $(this).attr("selectedIndex")-1

Value : $("option:eq(" + () +  ")", this).val()
Text :  $("option:eq(" + ($(this).attr("selectedIndex")-1) +  ")", this).text()

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0
 
LVL 83

Expert Comment

by:leakim971
ID: 34915388
bad copy cut, sorry :

Value :
$("option:eq(" + ($(this).attr("selectedIndex")-1) +  ")", this).val()

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Text :  
$("option:eq(" + ($(this).attr("selectedIndex")-1) +  ")", this).text()

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