Programming Forums > Web Development and Design > ASP.NET

paulchwd · Sep 26th, 2007, 9:10 AM

Hi...

I have an aspx page and a c# codebehind. How can I call a javaScript function before the codebehind is executed. I used the 'standard' controls (visual studio 2005 professional) so that when i double click on the control ie: a button the event code is generated in the c# codebehind...

I have a javaScript function called validateMe() and in the standard control's tag in the aspx file i add onclick="validateMe()" and i receive an error saying there is no such function

1. What is the difference between the 'standard' controlls in visual studio and the html controlls in visual studio ?

2. I have a standard button on my form. I tried adding onsubmit="validateMe()" and it did not get triggered -- but i got an error that such function doesnt exist

Thnx

(Toggle Plain Text)

  <asp:Button ID="submit" onclick="validateMe()" runat="server" BackColor="Highlight" BorderColor="White"

(Toggle Plain Text)

function validateMe()
{
//Price
alert('yy');
   var price = document.getElementById('price')
   if(price.value.indexOf("$") == -1)
   {
      price.value.repalce("$", "");
   }
   if(price.value.indexOf(".") == -1)
   {
      price.value = price.value & ".00";
   }
   
   var regDecimal = new RegExp("^[0-9]+\.{1}[0-9]+$");
   
   if(!regDecimal.test(price)
   {
        var price_errDiv = document.getElementById('price_err');
        price_errDiv.style.visibility="visible";
   }
   
   
}

DaWei · Sep 26th, 2007, 9:48 AM

Paul, do you understand the nature of the client/server paradigm?

paulchwd · Sep 26th, 2007, 9:57 AM

Ah DaWei,

I do understand the seperation of client server, my problem is i am new to ASP.net and my way of thinking is more that of ASP.

How can I cause my client side validation script to execute before the server-side cs program is executed. In classic ASP i wold put 'onsubmit="validateMe()" to the form tag. But it seems that the button I added isnt a 'submit' button... its a 'standard' control (in visual studio)

DaWei · Sep 26th, 2007, 12:56 PM

Howzabout 'onclick = "validateMe ()";' and the last statement, if valid, is a submit?

big_k105 · Sep 26th, 2007, 3:58 PM

I think this is what you are looking for.
http://www.c-sharpcorner.com/UploadF...b-df0c669afd6c

which would be like using this (OnClientClick)

 asp.net Syntax (Toggle Plain Text) 
<asp:Button ID="submit" OnClientClick="return validateMe()" runat="server" BackColor="Highlight" BorderColor="White"
<asp:Button ID="submit" OnClientClick="return validateMe()" runat="server" BackColor="Highlight" BorderColor="White"

If true is returned then it will submit I believe and if false then it won't.

paulchwd · Oct 1st, 2007, 8:44 AM

Perfect, thanks

Sep 26th, 2007, 9:10 AM	#1
paulchwd Hobbyist Programmer Join Date: Mar 2005 Posts: 139 Rep Power: 4	javaScript Hi... I have an aspx page and a c# codebehind. How can I call a javaScript function before the codebehind is executed. I used the 'standard' controls (visual studio 2005 professional) so that when i double click on the control ie: a button the event code is generated in the c# codebehind... I have a javaScript function called validateMe() and in the standard control's tag in the aspx file i add onclick="validateMe()" and i receive an error saying there is no such function 1. What is the difference between the 'standard' controlls in visual studio and the html controlls in visual studio ? 2. I have a standard button on my form. I tried adding onsubmit="validateMe()" and it did not get triggered -- but i got an error that such function doesnt exist Thnx (Toggle Plain Text) <asp:Button ID="submit" onclick="validateMe()" runat="server" BackColor="Highlight" BorderColor="White" <asp:Button ID="submit" onclick="validateMe()" runat="server" BackColor="Highlight" BorderColor="White" (Toggle Plain Text) function validateMe() { //Price alert('yy'); var price = document.getElementById('price') if(price.value.indexOf("$") == -1) { price.value.repalce("$", ""); } if(price.value.indexOf(".") == -1) { price.value = price.value & ".00"; } var regDecimal = new RegExp("^[0-9]+\.{1}[0-9]+$"); if(!regDecimal.test(price) { var price_errDiv = document.getElementById('price_err'); price_errDiv.style.visibility="visible"; } } function validateMe() { //Price alert('yy'); var price = document.getElementById('price') if(price.value.indexOf("$") == -1) { price.value.repalce("$", ""); } if(price.value.indexOf(".") == -1) { price.value = price.value & ".00"; } var regDecimal = new RegExp("^[0-9]+\.{1}[0-9]+$"); if(!regDecimal.test(price) { var price_errDiv = document.getElementById('price_err'); price_errDiv.style.visibility="visible"; } }

Sep 26th, 2007, 9:48 AM	#2
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	Paul, do you understand the nature of the client/server paradigm? __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

Sep 26th, 2007, 12:56 PM	#4
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	Howzabout 'onclick = "validateMe ()";' and the last statement, if valid, is a submit? __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

Sep 26th, 2007, 3:58 PM	#5
big_k105 PFO Founder Join Date: Mar 2004 Location: Fargo, ND Posts: 1,629 Rep Power: 10	I think this is what you are looking for. http://www.c-sharpcorner.com/UploadF...b-df0c669afd6c which would be like using this (OnClientClick) asp.net Syntax (Toggle Plain Text) <asp:Button ID="submit" OnClientClick="return validateMe()" runat="server" BackColor="Highlight" BorderColor="White" <asp:Button ID="submit" OnClientClick="return validateMe()" runat="server" BackColor="Highlight" BorderColor="White" If true is returned then it will submit I believe and if false then it won't. __________________ BIG K aka Kyle Programming Forums Kyle K Online Please do not PM or email me programming questions. Post them in the forums instead.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Sep 26th, 2007, 9:57 AM	#3
paulchwd Hobbyist Programmer Join Date: Mar 2005 Posts: 139 Rep Power: 4	Ah DaWei, I do understand the seperation of client server, my problem is i am new to ASP.net and my way of thinking is more that of ASP. How can I cause my client side validation script to execute before the server-side cs program is executed. In classic ASP i wold put 'onsubmit="validateMe()" to the form tag. But it seems that the button I added isnt a 'submit' button... its a 'standard' control (in visual studio)

Oct 1st, 2007, 8:44 AM	#6
paulchwd Hobbyist Programmer Join Date: Mar 2005 Posts: 139 Rep Power: 4	Perfect, thanks

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Start Learning Java script	smita	JavaScript and Client-Side Browser Scripting	0	Mar 15th, 2007 7:47 AM
Hidden unless Javascript enabled?	Writlaus	JavaScript and Client-Side Browser Scripting	3	Apr 25th, 2006 10:52 PM
Javascript alternative?	Writlaus	JavaScript and Client-Side Browser Scripting	32	Apr 21st, 2006 12:44 AM
HTML page not reading external Javascript file	aznluvsmc	JavaScript and Client-Side Browser Scripting	9	Nov 21st, 2005 9:17 PM