Adding javascript functions to asp control

Question

iv'e got an asp button which performs another task besides postback

i have done this by adding javascript code to the button as follows

       if( !IsPostBack )
            btn1.Attributes.Add("onclick", "f();");

i'm not sure of 2 things

the first :

where in the cs code i should add the function f() , currently i'm doing it in page load while ignoring postbacks because then the function would have already been added(i might be wrong)

the second :

is there any to make the function execute only if the page was validated ? (after postback)

thanks in advance eran.

Using JavaScript Along with ASP.NET ?

Soner Gönül
– Soner Gönül

2011-08-15 12:04:01 +00:00
Commented Aug 15, 2011 at 12:04 — Soner Gönül
– Soner Gönül, Commented Aug 15, 2011 at 12:04
yes... i got some client code

eran otzap
– eran otzap

2011-08-15 15:52:45 +00:00
Commented Aug 15, 2011 at 15:52 — eran otzap
– eran otzap, Commented Aug 15, 2011 at 15:52

James Johnson · Accepted Answer · 2011-08-15 14:55:02Z

2

I would use OnClientClick instead of adding the click event throug the attributes. As for your JavaScript, I would add it in the ASPX part. Depending on what the function does, you might be able to avoid the code behind all together and do something like this:

<asp:Button ID="Button1" runat="server" Text="Hi" OnClientClick="javascript:return f();" OnClick="Button1_Click" />

From your f() function, kick off the validation, and return true if validation passes, otherwise return false. If OnClientClick returns true the page will post back, and if it returns false the page will not post back.

answered Aug 15, 2011 at 14:55

James Johnson

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3 Comments

Marko Over a year ago

and don't use javascript:func - it's so 90's! The function name is sufficient.

eran otzap Over a year ago

thanks ,that was the right way to go. btw , could i have used my validators through the java script ? what i did is create my own validation in order to decide if to proceed or not , what i mean is if lets say i got a required field validator could i do something like RFValidator1.Validate() ?

James Johnson Over a year ago

Yes, you can probably do your validation from within your JS function. Just call Page_ClientValidate()

hunter · Accepted Answer · 2011-08-15 12:06:04Z

1

1st Question

You will need to add it each time.

btn1.Attributes.Add("onclick", "f();");

2nd Question

You can check the validity of a page by checking the Page.IsValid Property

answered Aug 15, 2011 at 12:06

hunter

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Comments

Marko · Accepted Answer · 2011-08-15 15:02:32Z

0

Unobtrusive JavaScript

If you're serious about javascript then you don't want to write inline javascript. You will want to create an event handler in javascript code inside the script tags or in a external file.

If you're using .NET 4 server control id:s will be good, else I would use jquery's contains selector. Search for the given server control ID.

answered Aug 15, 2011 at 15:02

Marko

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