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Getting the value of a label using JavaScript

Posted on 2014-11-17
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399 Views
Last Modified: 2014-11-24
I have a label on my page called lblActualProductionQuantity

Inside a repeater, I have 2 textboxes called tbTotalQuantity and tbQuantityPerDisplay.
(I also have a text box inside this repeater called testQty, which ultimately will not be used)

What I'm trying to do is as the user is typing, I want to make tbTotalQuantity (inside repeater) = tbQuantityPerDisplay (inside repeater) times lblActualProductionQuantity (Outside repeater)

When I run this code, it works fine. All of the controls however are inside the repeater

<script type="text/javascript">
    function closest(elm, className) {
        do {
            elm = elm.parentNode;
            if (elm.className !== undefined && elm.className.indexOf(className) > -1) {
                return elm;
            }
        } while (elm.className !== undefined);
        return null;
    }
    window.populate_num = function populate_num(elm) {
        var dm = closest(elm.parentElement, 'entry');
         dm.getElementsByClassName("tbTotalQunatity")[0].value = dm.getElementsByClassName("tbQtyPerDisplay")[0].value * dm.getElementsByClassName("testQty")[0].value;
    }
</script>

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I want to replace testQty with lblActualProductionQuantity in my code. Here is what I've tried:

<script type="text/javascript">
    function closest(elm, className) {
        do {
            elm = elm.parentNode;
            if (elm.className !== undefined && elm.className.indexOf(className) > -1) {
                return elm;
            }
        } while (elm.className !== undefined);
        return null;
    }
    window.populate_num = function populate_num(elm) {
        var dm = closest(elm.parentElement, 'entry');
        dm.getElementsByClassName("tbTotalQunatity")[0].value = dm.getElementsByClassName("tbQtyPerDisplay")[0].value * document.getElementById("lblActualProductionQuantity").value;
    }
</script>

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That doesn't work, but I figured the logic would make more sense if I posted it. So how do I get the value of the label lblActualProductionQuantity which is outside of the repeater?


TIA
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Comment
Question by:mwmiller78
  • 2
3 Comments
 
LVL 14

Expert Comment

by:quizwedge
ID: 40448200
Since the label is inside of a repeater, there would be multiple elements with the ID of lblActualProductionQuantity. This shouldn't happen, so ASP.NET renames the IDs for you.

You could continue to use class names or in your javascript you can use the asp.net control name to get the client ID.

Code example (not mine) can be found at http://www.codeproject.com/Tips/578580/How-to-Get-User-Controls-ClientID-in-JavaScript-in

VB code:
Public Function getClientID() As String
        Return Controls.ClientID
End Function

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Javascript example:
function FunctionName {
    alert(document.getElementById('<%=Uctest.getClientID()%>').value);
}

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Accepted Solution

by:
mwmiller78 earned 0 total points
ID: 40453064
Got it. Labels do not have values.
Number(lblActualProductionQuantity.innerText) worked
0
 

Author Closing Comment

by:mwmiller78
ID: 40461735
I was not provided with a working solution and was able to figure it out.
0

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