How to write a javascript from .net code behind file.

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Hi i have an user control suppose a.ascx, i want to write a javascript file in user control code behind file. Can any one please convert the below javascript file to call from code behind.

Javascript file

JavaScript

function xrxIdentifyCurrentBrowser() {
       var uaString = navigator.userAgent;
       return (((uaString != undefined) && (uaString != null)) ? (((uaString = uaString.toLowerCase()).indexOf("galio") >= 0) ?
           "FirstGenBrowser" : ((uaString.indexOf("webkit") >= 0) ? "SecondGenBrowser" : "Unknown")) : "No User Agent");
   }

Posted 16-Feb-15 7:56am

Ashad25

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Afzaal Ahmad Zeeshan · Answer 1 · 2015-02-16T08:44:00

I also tried to help you out on that Stack Overflow thread of your question, the problem actually is that you shouldn't actually ask the server-side code to take over the client-side code too. If you have to then you have to register the code at the start-up and then execute it.

But, another solution, which I provided there too, is that you need to determine the browser only. Then you can make a good use the Request.Browser object, to check the properties of the browser. It would give you details about the browser itself, and can be used in the server-side C# code.

Otherwise, the JavaScript code as Solution 1 says, must be executed in the client-side code environment (by JavaScript only). You can make up a file, and reference that file in your actual HTML DOM, or you can write that in a script element in your HTML DOM. But still it won't be as much efficient as it can be to perform all these checks at the server-side using that Request.Browser object.

You can read the MSDN document[^] about the Request.Browser and different members it exposes for you to work out in determining the browsers.

How to: Detect Browser Types and Browser Capabilities in ASP.NET "Web Forms (Same underlying code; don't panic)"[^]

Vladimir Svyatski · Answer 2 · 2015-02-16T08:11:00

I believe that code-behind files can only contain server side code in C# or VB.NET. You have 2 options:

Embed your function into your page like this:

HTML

<script type="text/javascript">
function xrxIdentifyCurrentBrowser() {
  var uaString = navigator.userAgent;
  return (((uaString != undefined) && (uaString != null)) ? (((uaString = uaString.toLowerCase()).indexOf("galio") >= 0) ?
            "FirstGenBrowser" : ((uaString.indexOf("webkit") >= 0) ? "SecondGenBrowser" : "Unknown")) : "No User Agent");
    }
</script>

Create a JS file containing your functions somewhere inside your site folder and insert it into your page like this

HTML
```
<script type="text/javascript" src="yourfile.js"></script>
```