add java script function in asp.net

Question

4.00/5 (1 vote)

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hi every one
i add this

<script type="text/javascript">
function g(par)
{
    if (par=='d')
    {
        alert('d');
        <% dd();%>; // call c# method  
    } 
}
</script>

to aps.net
whay in form load this function must raise

why?

Posted 27-Apr-11 9:04am

Mostafa Elsadany

Updated 27-Apr-11 9:07am

Kristian Sixhøj

v2

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Comments

Monjurul Habib 27-Apr-11 15:09pm

what you mean by "whay in form load this function must raise" ? and <% dd();%>; // call c# method
please share your exact code.

Mostafa Elsadany 27-Apr-11 15:24pm

ok the idea
i want call c# method from javascript
so
i declare function javascript
and in this function i put
<% dd();%>; // call c# method
dd(); is method c#
ok
when i run project this dd();
is run without call he g(par)
so why

3 solutions

Solution 1

i think that you need to use Page.GetPostBackEventReference() to post your form so you can call methods on Server-Side.

See this [^]

good luck;

Posted 27-Apr-11 9:25am

Ali Al Omairi(Abu AlHassan)

Comments

Manfred Rudolf Bihy 28-Apr-11 13:46pm

Sounds reasonable! 5+

Ali Al Omairi(Abu AlHassan) 28-Apr-11 16:59pm

Thank you,sir;

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Manfred Rudolf Bihy · Accepted Answer · 2011-04-27T10:27:00

Solution 2

You have some confusion about what is evaluated when and where. The code snippet you showed us is from your ASP.net aspx page. This page in conjunction with the code behind file is run on the server side. The output is being rendered to HTML including the javascript you have in your aspx page. The tags you included inside the javascript block are also only evaluated on the server side. So all you achieved is that the method dd() is being called at the execution time on the server. If you want to call a server side method while the javascript is being exeuted on the client you'd have to use ASP.NET postback or AJAX.

Regards,

-MRB

Posted 27-Apr-11 10:27am

Manfred Rudolf Bihy

Comments

walterhevedeich 27-Apr-11 21:38pm

I agree. My 5. :)

Mostafa Elsadany 28-Apr-11 13:23pm

thanks fro help

Manfred Rudolf Bihy 28-Apr-11 13:45pm

I'm glad if it helped you. Please also consider Walter's approach of using jQuery to do the heavy lifting in conjunction with Page Methods.

Happy coding!

Mostafa Elsadany 28-Apr-11 15:24pm

do you want know my problem
if you have background in use devexpress tools in asp.net

Manfred Rudolf Bihy 28-Apr-11 15:33pm

I'm sorry to say that I do not have any knowledge of devexpress tools. My knowledge is more general javascript, Ajax and javascript frameworks like jQuery and PrototypeJS.

Mostafa Elsadany 28-Apr-11 15:58pm

ok i have tools by devexpress to export datagrid to pdf or excel and so on
i want call this tools by ajax in asp.net
when i use a jaxa not call void of exporting

walterhevedeich · Accepted Answer · 2011-04-27T15:34:00

Solution 3

I agree with the 1st solution. You might want to use AJAX to accomplish this task. Read more about PageMethods. Here are some links to get you started.
Using PageMethods and JSON in ASP.NET AJAX[^]
Calling Server Side Code from Client Side using Ajax[^]

Alternatively, you can also use JQuery to do this. See below.
Using jQuery to directly call ASP.NET AJAX page methods[^]

Posted 27-Apr-11 15:34pm

walterhevedeich

Updated 27-Apr-11 18:42pm

v2

Comments

Mostafa Elsadany 28-Apr-11 13:23pm

thanks fro help

Manfred Rudolf Bihy 28-Apr-11 13:46pm

Great links! 5+

I must admit I love jQuery :)

Ali Al Omairi(Abu AlHassan) 28-Apr-11 17:08pm

i agree its realy cool.

you know what the cp is a great site every day i learn new things from this site.

walterhevedeich 29-Apr-11 4:42am

thanks.

Ali Al Omairi(Abu AlHassan) 28-Apr-11 17:12pm

hundred of roses man, great links;

walterhevedeich 29-Apr-11 4:42am

thank you.