Dynamically Define Size Of A Textbox?

Aug 29, 2011

I have to define a textbox in html whose maximum size should be 3.Now If I am entring -100 then these are 4 characters but I want that user should allow to enter 100 or -100.If I define size="3" then it will not allow -100. so i want to know can we define size of the textbox dynamically,i.e. if I enter

- sign then size will increase to 4 else it should be 3.can we do this using js?

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Code:

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========>
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