I have the following code that I want to return to a variable "t" in javascript:
Code behind:
Public Shared Function GetSomeText() As String
Dim result = "This is from code behind"
Return result
End Function
Caller variable in javascript:
//This is not working like that, I think
var t = GetSomeText();
So, how can I make variable "t" get the "result" from Function GetSomeText from code-behind?
Thank you.
Try this -- assuming that this a public method on the page. This will call the method GetSomeText() on the page class and then do a Response.Write() of the data to the page as it's being rendered. The result should end up between the single quotes in your javascript.
var t = '<%= GetSomeText() %>';
You need to write the string to a Javascript variable in server-side code, like this: (In a <script> block in the ASPX page)
var t = "<%= GetSomeText() %>";
Note that you must correctly escape it, like this: (Or using the AntiXSS Toolkit
public static void QuoteString(this string value, StringBuilder b) {
if (String.IsNullOrEmpty(value))
return "";
var b = new StringBuilder();
int startIndex = 0;
int count = 0;
for (int i = 0; i < value.Length; i++) {
char c = value[i];
// Append the unhandled characters (that do not require special treament)
// to the string builder when special characters are detected.
if (c == '\r' || c == '\t' || c == '\"' || c == '\'' || c == '<' || c == '>' ||
c == '\\' || c == '\n' || c == '\b' || c == '\f' || c < ' ') {
if (b == null) {
b = new StringBuilder(value.Length + 5);
}
if (count > 0) {
b.Append(value, startIndex, count);
}
startIndex = i + 1;
count = 0;
}
switch (c) {
case '\r':
b.Append("\\r");
break;
case '\t':
b.Append("\\t");
break;
case '\"':
b.Append("\\\"");
break;
case '\\':
b.Append("\\\\");
break;
case '\n':
b.Append("\\n");
break;
case '\b':
b.Append("\\b");
break;
case '\f':
b.Append("\\f");
break;
case '\'':
case '>':
case '<':
AppendCharAsUnicode(b, c);
break;
default:
if (c < ' ') {
AppendCharAsUnicode(b, c);
} else {
count++;
}
break;
}
}
if (b == null) {
b.Append(value);
}
if (count > 0) {
b.Append(value, startIndex, count);
}
return b.ToString();
}
