Solved

Javascript to sum fields in gridview not working

Posted on 2008-10-29
2
1,270 Views
Last Modified: 2012-05-05
I have some javascript functions that run on the onkeyup event of some textboxs in a gridview.   Now I'm trying to add an additional function to sum some more.  I'm getting an error on page at the bottom of the browser when the event fires.  The error lists at the line before my new function and says "Object does not support this property or method".

My code is shown below.  The new function I'm adding in SumItUpB.  The other functions still work good (Thanks to some previous help from Experts-Exchange).
The javascript code

 

 function SumItUp(textResult)

			{

				var x = 0;

				var y = 0;

				var z = 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] * 1.00);

				}

				//display the result

				z = (y * 1);

			    document.getElementById(textResult).value = z.toFixed(2);

				//document.getElementById(textResult).value = (y * 1.00);

				

			    }

			

			function SumItUpB(textResult)

			{

	         var x = 0;

			 var y = 0;

			  

			  var myArray2 = new Array();

			  <%= JSArray2 %>

			  for (x = 0; x < myArray2.length; x++);

			  {

			        y = y + (myArray2[x] * 1.00);

			  }

			  

			  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 * 1.00);

				}

				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;

               }

The C# Code:

 

 protected void gvMealsForSell_RowDataBound(object sender, GridViewRowEventArgs e)

    {

 

        if (e.Row.RowType == DataControlRowType.DataRow)

        {

            // Get values for calculation

            TextBox txtQuantity = (TextBox)e.Row.FindControl("txtNumberToBuy"); // quantity

            HiddenField hfMealPrice = (HiddenField)e.Row.FindControl("hfMealPrice"); // meal price

            HiddenField hfTotal = (HiddenField)e.Row.FindControl("hfTotal"); //total 

            

            txtQuantity.Text = "0"; // Default value

 

            // Add javascript to text box with calcualtion values

            txtQuantity.Attributes.Add("onkeyup", "javascript:Multiply('" + txtQuantity.ClientID + "','" + hfMealPrice.ClientID + "','" + hfTotal.ClientID + "');SumItUp('" + this.txtTotalDue.ClientID + "');SumItUpB('" + this.txtTotalItems.ClientID + "')");

       

            //Set up javascript array

            JSArray  += "myArray[" + counter.ToString() + "] = document.getElementById('" + hfTotal.ClientID + "').value;" + Environment.NewLine;

            JSArray2 += "myArray2[" + counter.ToString() + "] = document.getElemenetById('" + txtQuantity.ClientID + "').text;" + Environment.NewLine;

  

            //counter to maintain the js array index

            counter += 1; 

 

        }

Open in new window

0
Comment
Question by:weimha
2 Comments
 
LVL 28

Assisted Solution

by:Pravin Asar
Pravin Asar earned 500 total points
ID: 22845279
To do math operations on the variable values, it is a good idea to parse as Float

e.g.

var x= 1.0;
var y = "2.5";

var sum = parseFloat(x) + parseFloat(y);
alert (sum);


So where you are trying to add/multiply the variable, please use parseFloat

0
 

Accepted Solution

by:
weimha earned 0 total points
ID: 23008723
I've decided not to do this.
Thanks for the input.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article is for Object-Oriented Programming (OOP) beginners. An Interface contains declarations of events, indexers, methods and/or properties. Any class which implements the Interface should provide the concrete implementation for each Inter…
Performance in games development is paramount: every microsecond counts to be able to do everything in less than 33ms (aiming at 16ms). C# foreach statement is one of the worst performance killers, and here I explain why.
The viewer will learn the basics of jQuery, including how to invoke it on a web page. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery.: (CODE)
The viewer will learn the basics of jQuery including how to code hide show and toggles. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery…

896 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now