Cleaning up Custom Field Validator Code in an ASP.NET application.
Picking up a project that was already in full swing I was asked to fix up the shopping cart module for the site. The shopping cart need some validation added on 2 sections. The first section was mandatory, personal details, and the second section was optional shipping details. The example has been simplified but the idea is the same.
The issues I wanted to address included
- Remove inline scripts
- Encapsulate javascript
- Added optional custom validation to an optional section of the page
the asp.net markup that will need to be validated
li>label>Different Shipping Addresslabel>asp:CheckBox ID='chkHasNickName' runat='server' />li>
li>label>Shipping Addresslabel>
asp:CustomValidator ID='cfvNickName' runat='server' Display='None' ErrorMessage='Please enter a nick name' ClientValidationFunction='CFVAPP.Validator.CV_NicknameEntered' />
asp:TextBox ID='txtNickName' runat='server' />
li>
In the page load function we will need to make the id’s for the validation
protected override void OnLoad(EventArgs e) {
base.OnLoad( e );
Page.ClientScript.RegisterExpandoAttribute( cfvNickName.ClientID, 'chkHasNickName', chkHasNickName.ClientID, false );
Page.ClientScript.RegisterExpandoAttribute( cfvNickName.ClientID, 'txtNickName', txtNickName.ClientID, false );
}
We will now need to extend the javascript added before to complete some validation
CFVAPP.Validator = (function () {
return {
CV_NicknameEntered: function (sender, arguments) {
var hasNickName = document.getElementById(sender.chkHasNickName);
var cvField = document.getElementById(sender.txtNickName);
if (cvField.value == '' && hasNickName.checked) {
arguments.IsValid = false;
}
return;
}
}
})();
