Check if TextBox value starts with specific number in JavaScript

Question

I have ASPNet TextBox I want validation on its keypress that the Textbox should accept only numeric and the number should starts with 05In my javascript function it is accepting numeric only What I will make changes in that function that the number should start only with 05 using Javascriptltscript type34textjavascript34gt    function isNumberevt         evt  evt  evt  windowevent        var charCode  evtwhich  evtwhich  evtkeyCode        if charCode gt 31

dharmendr · Accepted Answer

Hi IkramshamsRefer below codeHTMLlthtml xmlns34httpwwww3org1999xhtml34gtltheadgt    lttitlegtlttitlegtltheadgtltbodygt    ltinput type34text34 id34txtMobileNo34 maxlength341034        onkeypress34return isNumberevent34 oninput34isStartWithevent34 gt    ltscript type34textjavascript34gt        function isNumberevt             evt  evt  evt  windowevent            var charCode  evtwhich  evtwhich  evtkeyCode            if charCode gt 31 ampamp charCode lt 48  charCode gt 57                 return false                        return true                function isStartWithevt             var value  evttargetvalue            if valuecharAt0  39039                 evttargetvalue  3939                        else if valuecharAt1  39539                 evttargetvalue  39039                        lt

Check if TextBox value starts with specific number in JavaScript

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