Hi all,
Can somebody help me figure out whats wrong with my program?
I created a site with the use of MasterPage..and with a plan of utilizing and abusing the capabilities of AJAX, I added the ScriptManager to create PageMethods.
Here's what I did:
1. I added the "ScriptMana ger" and the "JavaScript that calls the page method" in MasterPage...wi th Javascript inside the <body> tag and ScriptManager inside the <form> tag.
2. In the "Child Form", I created a HTML image component, and in the OnClick event it calls the JavaScript function which calls the PageMethod.
When I run the page it doesnt display any errors at all, but everytime I click the image component(which triggers the javascript func)..it displays "Error on page" at the bottom left side of the page and the desired output don't display.
You might be thinking that the error could be on the code(which probably true), but I tried the same code without using a MasterPage and it works without any error.
Any suggestion and advice will be very much appreciated. Thanks.
16  11611  Frinavale 9,735
Recognized Expert Moderator Expert
It is very likely that this is a JavScript error.
You could use IE8 or FireFox's FireBug tool to debug the error.
-Frinny
Hi Frinny!
Thanks for the reply.
Yeah I agree with you that it is very likely a JavaScript error. But why is it that, when I run the page in a single page(without using the MasterPage) and using the same JavaScript function, It executes smoothly? Isn't the error also something to do with 'ScriptManager' being placed in the MasterPage or something to that effect?
Btw, I placed the PageMethods inside a Base Class which inherits the System.Web.UI.P age and all pages inherits that Base Class. (I did this as it was mentioned in the other forum that PageMethods should be placed inside a BaseClass when using MasterPage)
Thanks.
Hi krungkrung,
Can you pl tell that where the "JavaScript " function is written?
If the javascript function is written within UPDATEPANEL then there is a chance that script manager has discarded that function while rendering the page to browser. So I'd suggest to keep the function in separate file and register script file from the code behind.
Hope it helps,
Sudev Gandhi
Frinavale 9,735
Recognized Expert Moderator Expert
Sudev could be right...
You may need to register your JavaScript function with the ScriptManager.. .
We won't know until you share with us the error details that FireBug or IE8 tells you and give us more details on where/how you are defining your JS.
:)
-Frinny
hi Frinny and sudevg!
thanks for your generous reply.
sorry i forgot to post quickly, but i already figured out the problem.
the problem was just the control id being passed to the function. i found out that asp.net(correct me if am wrong) generates control id automatically, of every control within a page upon processing. eg, txtTextInput component would generate something like ctrl001_xxxxx_t xtTextinput control id. So if I pass the "txtTextInp ut", which is the control's name, to the function, the javascript's document.getEle mentById('txtTe xtInput') will return nothing since "txtTextInp ut" is not considered or identified as a control id of any control found within the page.
so here's what i did..though i think its kinda ugly but its the simplest way i could think for the mean time(if you have any idea i would be more than grateful if you share it to me)...from the code behind I pass the control's client Id to java script function...like , "txtTextinput.C lientID"...and that's it. as simple as that and my whole day was even brighter when I made it run after a couple of hours thinking what should be the problem of the program when I know I coded it correctly....ch eers!
 Frinavale 9,735
Recognized Expert Moderator Expert
The "control id" is accessible in your .NET code using the ClientID property of ASP.NET controls.
There are a few things that I can add to this.
First of all, if your element is calling a JavaScript method that does something to that element, you can access that element by referring to "this" in JavaScript.
For example, the following TextBox calls the JavaScript method "toUpper()" which changes the text entered into upper case. Note how I'm passing "this" as the parameter..."th is" refers to the TextBox element (for simplicity sake I'm using pure HTML instead of asp for this example): -
<html>
-
<body>
-
<script type="text/javascript>
-
function toUpper(element){
-
element.value=element.value.toUpperCase();
-
}
-
</script>
-
Enter some text: <input type="text" id="myTextBox" onkeyup="toUpper(this);" />
-
</body>
-
</html>
You can do the same thing with ASP elements....jus t pass the JavaScript function "this" and you'll have a reference to the element in your JavaScript.
If the JavaScript method does not modify the element that is calling it then you'll have to change things around a bit. Sometimes, if you don't want to pass the ClientID of the asp.net control into the method, you can dynamically print the ClientID directly into the JavaScript by calling the Response.Write( ) method using ASP.
In your ASP page you would have something like this: -
Enter some text: <asp:TextBox ID="myTextBox" runat="server" />
-
-
<script type="text/javascript>
-
function toUpper(){
-
var element = $get('<%= myTextBox.ClientID %>');
-
-
//The $get method is a method made available to us in the Ajax.NET
-
//framework. The Ajax.NET Framework is included with the page when
-
//you add a ScriptManager to the page. Since you have a ScriptManager
-
//on the page, you have access to this method. It is a short hand for
-
//javascript: document.getElementById() method. The following
-
//would accomplish the same thing:
-
//var element = document.getElementById('<%= myTextBox.ClientID %>');
-
-
element.value=element.value.toUpperCase();
-
}
-
</script>
Where in your .NET code you set the "onkeyup" for the myTextBox element.
Please note that <%= %> is class asp short hand for calling the Response.Write method. This will write the ClientID directly into the page so that you don't have to pass anything to the method.
This is only possible if your ASP element is on the same page as the JavaScript that it uses. If it's not on the same page then it's easier to just pass the element to the function.
-Frinny
Hi Frinny! Thanks for that very informative post. I really appreciate it. Im kinda..'wow!'.. and realized that I still have a lot of things to learn in asp.net....waaa yyy to go krungkrung..(", )
thanks..thanks. really.
Hi Frinny!
I just have a follow-up question...is it possible to pass a 'Page' as parameter from .Net procedure to a JavaScript function and return that passed 'Page' parameter to a VB.Net function...like : -
Sub FromNet()
-
Dim strTest As String = "<script language=javascript id='myClientScript'>ToJavaScript(" & MyPage & ");</script>"
-
Page.ClientScript.RegisterStartupScript(Me.GetType(), "testing", strTest )
-
End Sub
-
and the JavaScript would be: -
function ToJavaScript(objPage)
-
{
-
PageMethods.ReturnToNet(objPage);
-
}
-
-
Public Shared Sub ReturnToNet(ByVal myPage As Page)
-
-
call Kachurvahan(myPage )
-
-
End Sub
-
Frinavale 9,735
Recognized Expert Moderator Expert
No this isn't possible.
The Page Object is a .NET Object....it doesn't exist in the browser.
What are you trying to do?
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