Question

Рow to get the array in HTML file added from some side initialize in .cs file? Hope for your reply.

Answer 1

Your question does not provide enough info. I will assume you mean the codebehind file (c#) when you say .cs file (what else is there to assume?) and your array is added in c#, which you want to access in js

Register your array as a string literal as script block

something like:

string myArr = "; var myArr = [ 1, 2, 3, 4 ]; "; //putting your array in a string
ScriptManager.RegisterClientScriptBlock(Page, typeof(Page), myArr, true);

now in your html file, you can access them with javascript.

<script type="text/javascript">
 alert(myArr[2]); //will alert 3
</script>

For 2D arrays,

var myArr = [[0,0],[1,1],[2,2]]; //2D array
alert(myArr[0]); //    to access 1st row: [0,0]
alert(myArr[0][0]); // to access 1st row 1st column: 0