I have a string in my C# code-behind file in ASP.NET:
string data = "Data that is populated";
//Note: A method populates the actual data
I need to be able to convert this string to a JavaScript var. I know that using a Razor file is a common way to go and there are several questions on this topic, but I am unsure how to do this with a code-behind file, nor have I full understood the previous questions and answers.
In a case like this, I set a HiddenField.Value to the string's value, like this, in aspx:
<asp:HiddenField ID="HiddenField1" runat="server" />
and then in code behind:
HiddenField1.Value = "some string";
Now in JavaScript you can read that value and pass it to your function:
var myValue = document.getElementById('HiddenField1').value;
myFuction(myValue);
Use this code
protected void Page_Load(object sender, EventArgs e)
{
string scriptCode = @"
<script>
let text = {0};
alert(text);
</script>";
string message = "Hello World!";
scriptCode = string.Format(scriptCode, HttpUtility.JavaScriptStringEncode(message, true));
RegisterStartupScript("AlertCode", scriptCode);
}
The function RegisterStartupScript embeds JavaSript code into the page. Use JavaScriptStringEncode() to convert a string into a JavaScript string representation to use in that JavaScript code.