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BOOK: Beginning HTML, XHTML, CSS, and JavaScript
This is the forum to discuss the Wrox book Beginning HTML, XHTML, CSS, and JavaScript by Jon Duckett; ISBN: 978-0-470-54070-1
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Old April 8th, 2010, 06:19 AM
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Default Validate numeric and decimal data during keypress event

Hi,

I am using classic ASP and Javascript

How to restrict the user to only enter integer or decimal values and cannot enter text in my TextBox field. The user should be able to type only one decimal point

For example: 3.45 is valid while 3.34. is invalid

I want to validate in javascript during the key press event in the textbox.

Please help.
Thank you
 
Old April 8th, 2010, 09:21 AM
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Use regular expression, for example, /^[-+]?[0-9]*\.?[0-9]+$/. You may have to slightly adjust this to fit your specific needs. Your specific needs might be, for example: 1) Only accept numbers with two digits after decimal point; or 2) Accept 3. as a valid number and take it as 3.0.

Last edited by PeterPeiGuo; April 8th, 2010 at 09:36 AM..
 
Old April 8th, 2010, 10:24 AM
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Is it possible to call the regular expression during the key press event
 
Old April 8th, 2010, 02:14 PM
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Yes, try it out. If you run into issues, post your code and we can go from there.




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