javascript validation in asp.net 3.5

Question

i hv an aspx page in 3.5 so i want to validate 3 dropdownlist box for date with javascript.......then required field validate and email in correct format checkbox selection dropdown to validate for selection...with javascript....

Niradhip Chakraborty · Answer

For email validation you can use following javascript code: if (!isEmail(document.getElementById("txtEmail3").value)) { alert("Please Enter a Valid E-Mail Address in Shipping Address"); document.getElementById("txtEmail3").focus(); return false; } //Note: txtEmail3 is the id of the textbox function isEmail(s){ if (s.search(/^[a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$/) == -1){ return false; } else{ return true; } } now If you have given as "select date" as the first index and if you are trying to enforce user to select valid date. you can try this: if(document.getElementById("cboDate").selectedIndex ==0) { alert("Please select the Security Question"); return false; } //Note: cboDate is the id of the textbox I didnt understand the checkbox part.

javascript validation in asp.net 3.5

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