I'm trying to pass the output of a SQL Server exception to the client using the RegisterStartUpScript method of the MS ScriptManager. This works fine for some errors but when the exception contains
single quotes the alert fails.
I dont want to only escape
single quotes though - Is there a standard function i can call to escape any special chars for use in Javascript?
string scriptstring = "alert('" + ex.Message + "');";
ScriptManager.RegisterStartupScript(this, this.GetType(), "Alert", scriptstring , true);
Thanks tpeczek, the code almost worked for me :) but with a slight amendment (the escaping of
single quotes) it works a treat.
I've included my amended version here...
public class JSEncode
{
/// <summary>
/// Encodes a string to be represented as a string literal. The format
/// is essentially a JSON string.
///
/// The string returned includes outer quotes
/// Example Output: "Hello \"Rick\"!\r\nRock on"
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
public static string EncodeJsString(string s)
{
StringBuilder sb = new StringBuilder();
sb.Append("\"");
foreach (char c in s)
{
switch (c)
{
case '\'':
sb.Append("\\\'");
break;
case '\"':
sb.Append("\\\"");
break;
case '\\':
sb.Append("\\\\");
break;
case '\b':
sb.Append("\\b");
break;
case '\f':
sb.Append("\\f");
break;
case '\n':
sb.Append("\\n");
break;
case '\r':
sb.Append("\\r");
break;
case '\t':
sb.Append("\\t");
break;
default:
int i = (int)c;
if (i < 32 || i > 127)
{
sb.AppendFormat("\\u{0:X04}", i);
}
else
{
sb.Append(c);
}
break;
}
}
sb.Append("\"");
return sb.ToString();
}
}
As mentioned below - original source: here
