Javascript to limit input
Sunday December 4th, 2005
Need a way to limit what gets entered into an HTML textbox?
Plug this script into your textbox using...
JavaScript:
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onKeyPress="javascript:return limitinput(event, '0123456789', true);"
Variables
- event - The event that is passed. Just leave is as 'event' when you call it.
- strList - Either a black list or white list depending on the next variable.
- bAllow - If false strList acts as a black list. If true strList acts as a white list.
JavaScript:
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function limitinput(evt, strList, bAllow)
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/*Limits the input to strList. If bAllow is true, then
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only allow what is in strList. If bAllow is false,
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then do not allow what is in strList.
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http://blog.nutt.net
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*/
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{
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var charCode = evt.keyCode;
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if (charCode==0)
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{
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charCode = evt.which;
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}
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var strChar = String.fromCharCode(charCode);
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/*controlArray holds the ASCII codes for valid
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control commands (BS, CR, LF, etc)*/
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var controlArray = Array(0, 8, 9, 10, 13, 27);
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var intOut = 0;
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if (bAllow==true)
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{
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if (charCode==8 || charCode==9 || charCode==37 || charCode==39 || charCode==46 || charCode==116 || (strList.indexOf(strChar)!=-1))
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/*Valid*/
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{
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return true;
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}
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else
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{
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return false;
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}
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}
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else
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{
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if (charCode==8 || charCode==9 || charCode==37 || charCode==39 | charCode==46 || charCode==116 || (strList.indexOf(strChar)==-1))
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{
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return true;
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}
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else
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{
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return false;
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}
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}
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}