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Problem in OnKeyDown

Posted on 2011-03-24
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Last Modified: 2012-06-21
Hi

I have a textbox

<asp:TextBox ID = "txtMultilineTextBox" runat = "server"></asp:TextBox>

On Key down event I have written following code.

 
var txtMultilineTextBox = document.getElementById("<%=txtMultilineTextBox.ClientID %>");        
alert(txtMultilineTextBox.value.length);

When II press space on the textbox for the first time I am getting alert with value 0 when I press space again I got 1. Why is the first time I am getting the length of textbox as zero.


Regards
Karan
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Question by:KaranGupta
8 Comments
 
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Expert Comment

by:Rikin Shah
ID: 35204942
Change the event to OnKeyPress/OnKeyUp and check

~ Mrugesh
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Expert Comment

by:Proculopsis
ID: 35205009

>>>I am getting alert with value 0 when I press space again I got 1. Why is the first time I am getting the length of textbox as zero.

It's because in this event handler the effect of the key press has not yet been applied to the input field.


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Author Comment

by:KaranGupta
ID: 35205153
Hi rikin_shah:

I can't use on key up. The main reason is I am implementing character count thing in JavaScript so if I move my code to onkeyup and press the key without pressing up then it will not count character.

Proculopsis:

What is the solution for that
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Expert Comment

by:Gurvinder Pal Singh
ID: 35205231
use onkeypress event. It will be triggered after the text is entered in the textbox.

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Accepted Solution

by:
Proculopsis earned 1000 total points
ID: 35205242

Try something like this if you want a count/limit:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<title>http://www.experts-exchange.com/Programming/Languages/Scripting/JavaScript/Q_26908183.html</title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">

jQuery(document).ready( function() {

  $("#text").keyup( function() {
    var maximumLength = 9;
    if ( $(this).val().length > maximumLength ) $(this).val( $(this).val().substring( 0, maximumLength ) );
    $("#count").text( $(this).val().length );
  });
 
});

</script>
</head>
<body>

<input id="text" />

Count: <span id="count">0</span>/9

</body>
</html>

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LVL 29

Expert Comment

by:Badotz
ID: 35205247
>>if I move my code to onkeyup and press the key without pressing up then it will not count character.

onkeyup is the event that fires when you release a key. It does not mean the event that fires when you press the up (arrow) key.
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Assisted Solution

by:Rikin Shah
Rikin Shah earned 1000 total points
ID: 35205248
I hope this is what you're looking for...
http://www.smartwebby.com/dhtml/textbox_characters_counter.asp
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LVL 3

Expert Comment

by:timhigham
ID: 35219748
for each element have and invisible notification div EG

<div id="inputXerror">ERROR</div>

use javascript to check the whole form for 'onsubmit', making error div visible and returning false if there is an unacceptable input to prevent submission.

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