Validate TextBox on Change Event in JavaScript

Question

I want validate this input box  If the value is 971 it should be consider as empty box Is possible to validate using required field validatorltinput id34txtmobile34 runat34server34 dataformat 34971 ddd dddddddgt

dharmendr · Accepted Answer

Hi  SUJAYSRefer below codeHTMLlthtml xmlns34httpwwww3org1999xhtml34gtltheadgt    lttitlegtlttitlegt    ltscript type34textjavascript34gt        function Validatevalue             if value  3497134                 alert39Not valid39                        ltscriptgtltheadgtltbodygt    ltinput id34txtmobile34 runat34server34 onchange34Validatethisvalue34 gtltbodygtlthtmlgtDemo

Validate TextBox on Change Event in JavaScript

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