My problem is the following: I have a web application where people have a super-high tendency to put irrelevant keywords in their message title (typically example "Please Help" as a message title to the technical support team).

I would like to to strongly discourage the use of a list of "blacklisted" keywords as inputs for a given TextBox WebControl. I am currently think of a small script that would appear to display a warning message when a blacklisted keyword is entered.

Does anyone knows how to achieve such feature on client-side?

Thanks in advance,
Joannès

In the CodeBehind, Page_Load event handler, copy the key word list client-side:
string keyWordList = string.Empty;
for (int i=0; i<m_KeyWordList.Length; i++)
{
 if ( keyWordList.Length > 0 )
  keyWordList += ",";

 keyWordList += "new String('" + m_KeyWordList[i] + "')";
}

// keyWordList = "new String('word1'),new String('word2'), ...etc";
RegisterArrayDeclaration("JsKeyWordArrayArray", keyWordList);

// Add the validation script:
string validateTextBoxScript =
     "<script language=JavaScript>\n" +
     "function validateTextBox(elementRef)\n" +
     "{\n" +
     " var textBoxValue = elementRef.value;\n" +
     "\n" +
     " if ( textBoxValue == '' )\n" +
     "  return;\n" +
     "\n" +
     " for (var i=0; i<JsKeyWordArrayArray.length; i++)\n" +
     " {\n" +
     "  if ( textBoxValue == JsKeyWordArrayArray[i] )\n" +
     "   alert('WARNING: The word ' + JsKeyWordArrayArray[i] + ' is black-listed.');\n" +
     " }\n" +
    "}\n" +
     "</script>";

RegisterClientScriptBlock("ValidateTextBoxScriptScript", validateTextBoxScript);

// Add the client-side event handler to the TextBox:
TextBox1.Attributes.Add("onchange", "JavaScript: validateTextBox(this);");

NC...

 

Ok, thanks for the ideas.

Joannes

In thinking about your problem, you probably should change this:
     "  if ( textBoxValue == JsKeyWordArrayArray[i] )\n" +
to
     "  if ( textBoxValue.indexOf(JsKeyWordArrayArray[i]) != -1 )\n" +

since your TextBox is going to have multiple words.

NC...