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javascript events when using NumericUpDown extender in gridview

Posted on 2008-10-23
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Last Modified: 2009-07-29
I have a couple of javascript functions that fire on the onkeyup event for a textbox in a gridview.  Now I've added a NumericUpDown extender to the textbox and I want the same javascript functions to fire when the value in the textbox changes when using the NumericUpDown extender control but I don't know how to link the javascript functions to the extender control.

My code is shown below.
JAVASCRIPT CODE
 
function SumItUp(textResult)
			{
				var x = 0;
				var y = 0;
				
				var myArray = new Array();
				//add array items, this calls the public server variable we build in rowdatabound
				<%= JSArray %>
				//sum it:
				for (x = 0; x < myArray.length; x++)
				{
				    //multiply the value times one to trick js into always thinking the variable is a number
				    y = y + (myArray[x] * 1);
				}
				//display the result
				document.getElementById(textResult).value = (y * 1);
			}
 
         	
         		
			function Multiply(text1, text2, textResult)
			{
				var x = document.getElementById(text1).value;
				var y = document.getElementById(text2).value;
				if(IsNumeric(x) == true && IsNumeric(y) == true)
				{
				document.getElementById(textResult).value = (x * 1) * (y * 1);
				}
				else
				{
				document.getElementById(textResult).value = '';
				}
			}
			function IsNumeric(sText)
            {
               var ValidChars = "0123456789.-";
               var IsNumber=true;
               var Char;
               for (i = 0; i < sText.length && IsNumber == true; i++) 
                  { 
                  Char = sText.charAt(i); 
                  if (ValidChars.indexOf(Char) == -1) 
                     {
                     IsNumber = false;
                     }
                  }
               return IsNumber;
               }
 
ASPX CODE
<asp:TemplateField HeaderText="# to Buy">
                                             <ItemTemplate>
                                                 <asp:TextBox ID="txtNumberToBuy" runat="server" AutoPostBack="False" BorderColor="#759CAC"
                                                     BorderWidth="1px" CausesValidation="True" SkinID="TextBoxSkin" TabIndex="20"
                                                     Width="30px">1px</asp:TextBox>
                                                 <cc1:NumericUpDownExtender ID="txtNumberToBuy_NumericUpDownExtender" 
                                                     runat="server" Enabled="True" Maximum="1.7976931348623157E+308" 
                                                     Minimum="-1.7976931348623157E+308" RefValues="" ServiceDownMethod="" 
                                                     ServiceDownPath="" ServiceUpMethod="" Tag="" TargetButtonDownID="" 
                                                     TargetButtonUpID="" TargetControlID="txtNumberToBuy" Width="75">
                                                 </cc1:NumericUpDownExtender>
                                                 <asp:HiddenField ID="hfTotal" runat="server" Value="0.0" />
                                                 <asp:CompareValidator ID="CompareValidator1" runat="server" ControlToValidate="txtNumberToBuy"
                                                     Display="Dynamic" ErrorMessage="Integer Value Required" Operator="DataTypeCheck"
                                                     Type="Integer"></asp:CompareValidator>
                                             </ItemTemplate>
                                             <ItemStyle HorizontalAlign="Center" Width="100px" />
                                         </asp:TemplateField>
 
C# Code
 protected void gvMealsForSell_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        TextBox txtNumberToBuy = (TextBox)e.Row.FindControl("txtNumberToBuy");
        if (txtNumberToBuy != null)
            txtNumberToBuy.Text = "0";
 
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            // Get values for calculation
            TextBox txtQuantity = new TextBox();
            HiddenField hfMealPrice = new HiddenField();
            HiddenField hfTotal = new HiddenField();
                      
 
            txtQuantity = (TextBox)e.Row.FindControl("txtNumberToBuy"); // quantity
            hfMealPrice = (HiddenField)e.Row.FindControl("hfMealPrice"); // meal price
            hfTotal = (HiddenField)e.Row.FindControl("hfTotal"); //total
         
       
            // Add javascript to text box with calcualtion values
            txtQuantity.Attributes.Add("onkeyup", "javascript:Multiply('" + txtQuantity.ClientID + "','" + hfMealPrice.ClientID + "','" + hfTotal.ClientID + "');SumItUp('" + this.txtTotalDue.ClientID + "');");
                
            //Set up javascript array
            JSArray += "myArray[" + counter.ToString() + "] = document.getElementById('" + hfTotal.ClientID + "').value;" + Environment.NewLine;
  
            //counter to maintain the js array index
            counter += 1; 
 
        }
        
    }

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Question by:weimha
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3 Comments
 
LVL 10

Expert Comment

by:Bane83
ID: 22788422
Below is a sample of binding events to the buttons in a NumericUpDownExtender.
function pageLoad(sender, args) 
{
	var obj = $find('NumericUpDownExtender1');
	obj._bDown.onclick = down;
	obj._bUp.onclick = up;
}
 
function up()
{
	alert('up');
}
 
function down()
{
	alert('down');
}

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Author Comment

by:weimha
ID: 22796593
But since the extender is in the gridview rows, I don't know what name it is rendered with.  How can I find it in the $find function?
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LVL 10

Accepted Solution

by:
Bane83 earned 500 total points
ID: 22796766
View the source of your rendered page.  It should be something like ctl00_parent_gvMealsForSell_rowIdentifier_txtNumberToBuy_NumericUpDownExtender
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