How do I register a Javascript variable on the server side (backend) and access it on the client side (Javascript file), without a hidden field, Literal, etc.?
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4 Answers
You can use the RegisterClientScriptBlock-Function from the Page's ClientScriptManager.
Page.ClientScript.RegisterClientScriptBlock(Page.GetType, "initMyClientVariable", "var myClientVariable=null;", True)
EDIT: according to your new informations, that you want to register a client array, use ClientScriptManager's RegisterArrayDeclaration Method.
VB.Net example:
Dim myArrayValue As String = """1"", ""2"", ""text"""
Page.ClientScript.RegisterArrayDeclaration("myClientArray", myArrayValue)
According to the new information in my comments that you need access to that variable from an external js-file: you should pass the js-array as argument to the function in the js-file. For example:
callFunctionInJsFile(checkBoxes);
11 Comments
Basavaraj Badiger
Thanks for the Information. I did the same way , but i stuct up with one more issue . That variable registered appears in <script type="text/javascript"> //<![CDATA[ var myClientVariable=System.String[];//]]> </script> . (1) when i try to acceess that variable(myClientVariable) its throws message Object expected.How to access that variable to proceed further. (2) For myClientVariable i want to assign some variable in code behind , how can assign value . Pls assist me
Basavaraj Badiger
Ya i tried that Page.ClientScript.RegisterArrayDeclaration("myClientArray", myArrayValue). But how to access that array in the Javascript file so that i can work on that array. Kindly help me out
Tim Schmelter
You can access that array from client-side directly. View page-source in browser to see that the variable is available and intialized correctly.
Basavaraj Badiger
Hi , i tried following Method : In Page_load() of Asp.net (C# Code) String myArrayValue = "abc"; Page.ClientScript.RegisterArrayDeclaration("myClientArray", myArrayValue); But in the JavaScript Side : when it comes to CDATA Block like :::: <script type="text/javascript"> //<![CDATA[ var myClientArray = new Array(abc); //]]> < it throws Error : myClientArray is undefined. kindly help me to solve this issue . If possible quote me an example
Basavaraj Badiger
Also suggest how to handle in Masterpages , AjaxUpdate panels (i m using both ). pls suggest me
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You can put the following code in .aspx file ...
<script type="text/javascript" >
var date1 = "<%: DateTime.Now %>";
var date2 = "<%= DateTime.Now %>";
</script>
<%: %> works under ASP.NET 4
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You can put a literal in the xml portion of the code and assign that literal some text:
myLiteral.Text = "<script language=\"javascript\">var myVar = 24;</script>";
This makes myVar globally available on the client side once it's rendered. You can also use the ClientScriptManager object to use Asp.Net to inject scripts and variables.
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First place an <asp:Literal ID="Literal1" runat="server"></asp:Literal> tag in the <head> of your .aspx file.
Then in the server side code in your .aspx.cs file, do something like Literal1.Text = "<script type=\"text/javascript\">var timer = 3600</script>" and you've got yout javascript variable called timer.
That's it. Have fun!
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