. NET + JS instance code that prompts the number of words in the user input content

Step 1: The following is the core code, which can be referenced on the page or encapsulated.
Copy codeThe Code is as follows:
<Script language = "javascript" type = "text/javascript">

Function textLimitCheck (thisArea, maxLength, SpanId)

{

If (thisArea. value. length> maxLength)

{

ThisArea. value = thisArea. value. substring (0, maxLength );

ThisArea. focus ();

}

/* Write back the span value. Enter the text currently */

Var varss = '(remaining words:' + (maxLength-thisArea.value.length) + ')';

Document. getElementById (SpanId). innerHTML = varss;

}

</Script>

Step 2: apply this function to the text box
Copy codeThe Code is as follows:
<Asp: TextBox ID = "txtOwner_Name" runat = "server" Width = "250px" MaxLength = "50" onkeyup = "textLimitCheck (this, 50, 'spowner _ name ') "BackColor =" Info "> </asp: TextBox>

<Span id = "spOwner_Name" style = "color: gray"> <em> (less than 50 words) </em> </span>