How to pass javascript parameter to C# fucntion parameter

Posted on 2010-09-09
Medium Priority
Last Modified: 2012-05-10
Hii Dear
I have problem to call c# function from javascript with parameter which is pass in javascript function.

Its work fine if there is no parameter. But I want to pass javascript parameter value to C# function.

I have try following way.

<script type="text/javascript">    
function EventTrack(pIntEventID,pIntCategoryID,pLngMemberID,pStrAttributeA,pStrAttributeB,pStrAttributeC,pStrAttributeD,pStrAttributeE)
          var  lIntEventID=pIntEventID;            
          var  lIntCategoryID = pIntCategoryID;
           var lLngMemberID = pLngMemberID;
           var lStrAttributeA = pStrAttributeA;
           var lStrAttributeB = pStrAttributeB;
           var lStrAttributeC = pStrAttributeC;
           var lStrAttributeD = pStrAttributeD;
           var lStrAttributeE = pStrAttributeE;            
            //This is the function in C# page code
            <% trackEvent(%> lIntEventID <%=,%> lIntCategoryID <%=,%> lLngMemberID <%=,%> lStrAttributeA <%=,%> lStrAttributeB <%=,%> lStrAttributeC <%=,%> lStrAttributeD <%=,%> lStrAttributeE <%=);%>
            return true;

Thanks in advance
Question by:avacaralife
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LVL 31

Expert Comment

ID: 33636235
I am doubtul about your approach here. You need ot realise that your Javascript code executes at the client side, and the c# code on the server side. You cannot pass 'parameters' in the manner you are attempting.

You need to perhaps create a number of textboxes or hidden input controls on the form and set the values of those textboxes, then initiate a postback which causes the necessary processin to be done on the server side.

Expert Comment

ID: 33636276
Hi avacaralife,

Have you seen anything about PageMethods before? I was looking to call C# functions using javascript not too long ago and this is the best solution I could find.

Hava a look at these for some examples and info:

Author Comment

ID: 33636283
Thanks MlandaT,
Ok I will try the way suggest.
But if possible then I need to pass from java script.

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LVL 31

Accepted Solution

MlandaT earned 2000 total points
ID: 33636447
In aspx page you define a hidden input control (you would have one for each of the values you want to pass back):

<input type="hidden" name="htxtEventID" id="htxtEventID" value="" runat=server>
<!--We will use the txtFlag textbox to determine when we should execute the C# function-->
<asp:Textbox runat="server" ID="txtFlag" Width="0px" Text=""></asp:Textbox>

In the javascript you set the value of the input control and initiate a postback:

function EventTrack(pIntEventID,pIntCategoryID,pLngMemberID,pStrAttributeA,pStrAttributeB,pStrAttributeC,pStrAttributeD,pStrAttributeE)
                var  lIntEventID=pIntEventID;            
                //the rest of your variable declarations here

                document.getElementById("htxtEventID").value = lIntEventID;
                //set the values for the corresponding hidden input for each of your variables here

//by setting a value in the textbox txtFlag, we cause a TextChanged event to fire on the server. In this event we will call our c# function
                document.getElementById("<%#txtFlag.ClientID%>").value = "CallFunction";

And in the txtFlag_TextChanged event handler in the .aspx.cs file you can check:

protected void txtFlag_TextChanged(object sender, EventArgs e)
      If (txtFlag.Text == "CallFunction") {

            //here call your C# function, taking values from the javascript... expand for all the variables you need.


LVL 31

Expert Comment

ID: 33636471
SandyAgo's approach is also interesting.. I actually wasnt aware you could do that myself.

Author Comment

ID: 33636490
Thanks MlandaT,

Ok I will try this and reply you.
LVL 31

Expert Comment

ID: 33896067
Solutions were provided but no feedback was eventually given as to whether they helped find a working solution

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