Question

i have a textbox in asp.net form…. if i entered numbers not like 7 or 8 or 9, then script function should be araised with alert message…. how to achieve this…. that 7 or 8 or 9 are first digits in my texbox…

Answer 1

UPDATE:

var testValue = document.getelementbyid('<%= TEXT_BOX.ClientID %>').value;
var re = new RegExp('/^[7-9]/');
if (testValue.match(re))
    // SUCCESS
else
    // NO SUCCESS

Better solution is usage of RegexValidator with Regex /^[7-9]/ or something like that.
It will generate javascript code automatically