altering javascript using c#

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hi everybody,
Can anyone tell me a way to alter javascript code using c#.below i have given a javascript code.In that i have to put a value in the place marked as "?".i am writing this code in html page.

XML

<script type="text/javascript">
<!--
    var image1 = new Image()
    image1.src = "test1.aspx?ImageID=?"
    var image2 = new Image()
    image2.src = "test2.aspx?ImageID=?"
    var image3 = new Image()
    image3.src = "test3.aspx?ImageID=?"
//-->
</script>

is there any way by which i can put a value in the place of ? using c#.it would be great if you could help me.thank you in advance.god bless you

Posted 15-Aug-13 4:00am

faizel s

Updated 15-Aug-13 4:05am

v2

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Herbisaurus · Answer 1 · 2013-08-15T04:08:00

Solution 1

One managed way to insert JS into the page while in the back-end C# code is using
RegisterClientScriptBlock, see example:

C#

ClientScriptManager cs = Page.ClientScript;
String csname1 = "PopupScript";
String csname2 = "ButtonClickScript";
StringBuilder sb = new StringBuilder();
cstext2.Append("<script type=\"text/javascript\"> function DoClick() {");
sb.Append("Form1.Message.value='Text from client script.'} </");
sb.Append("script>");
cs.RegisterClientScriptBlock(cstype, csname2, sb.ToString(), false);

best,
H

Posted 15-Aug-13 4:08am

Herbisaurus

Updated 15-Aug-13 4:11am

v3

Comments

Joezer BH 15-Aug-13 10:09am

5ed!

faizel s 15-Aug-13 10:45am

can you please elaborate your solution as i am new to this javascript

Herbisaurus 18-Aug-13 1:57am

C# code runs on the Server Side.
Javascript runs on the Clinet Side.
The whole purpose of the Server Side is to produce the HTML that will run on the Client Side, containg all sorts of things in that HTML like CSS, Javascript, Silverlight, Flash etc.

Some times, you want to manually edit and add Javascript to the page (HTML) so that is will run on the Client Side. E.G you might want to write certain JS code that depends on the parameters in the C#, instead of have that code in the JS file or blocks while it might not be needed.

RegisterClientScriptBlock is code in C# used to dynamically write a script block into the HTML page.

anuradha.sardesai · Answer 2 · 2013-08-16T01:36:00

@faizal,

If we add a JavaScript function in .aspx file, it's code can not be changed. As suggested by Herbisaurus, you write your javascript function as a string. You have full liberty to change and write it at runtime as you want. Once you are done writing it, you have to make sure, it's read and executed as a JS function.

To do that, use RegisterClientScriptBlock and pass your string as a parameter.

Refer to http://msdn.microsoft.com/en-us/library/system.web.ui.clientscriptmanager.registerclientscriptblock.aspx this article for more details on RegisterClientScriptBlock