Posted: Sun Sep 19, 2004 7:43 am Validating User Input in HTML Control Text Field
How do I validate user input in a HTML Control Text Field?
Example 1: If the required text field asks for the user's email address and the user does not input the "@" sign, how do I check for this?
Example 2: If the required text field is left blank, how do I check for this?
How can I alert the user by maybe putting an asterisk next to the field (in addition to returning focus to the field)?
Joined: 15 May 2004 Posts: 8199 Location: Castle Rock CO USA
Posted: Sun Sep 19, 2004 9:14 am
You are going to have to use some type of Javascript. In the HEAD:
Code:
<script language="JAVASCRIPT">
<!--
function isMerchant_Email( strValue) {
var objRegExp = /(^[a-z]([a-z_\.]*)@([a-z_\.]*)([.][a-z]{3})$)|(^[a-z]([a-z_\.]*)@([a-z_\.]*)(\.[a-z]{3})(\.[a-z]{2})*$)/i;
return objRegExp.test(strValue);
}
function validate(theForm){
if(theForm.Merchant_Email.value == ""){
alert('Please enter a valid E-mail address to submit the form');
theForm.Merchant_Email.focus();
return false;
}
if(!isEmail(theForm.Merchant_Email.value)){
alert('Please enter a valid E-mail address to submit the form');
theForm.Merchant_Email.select();
theForm.Merchant_Email.focus();
return false;
}
return true;
}
// -->
</script>
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