Hi,
Use Validator proeprty. Define javascript function to validate the value and set the name of that function to the Validator property
validator : Function<div class="mdesc" style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 5px; padding-right: 0px; padding-bottom: 5px; padding-left: 0px; color: rgb(68, 68, 68); "><div class="long" style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; display: block; line-height: 18px; "><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">A custom validation function to be called during field validation (
validateValue) (defaults to <tt>null</tt>). If specified, this function will be called first, allowing the developer to override the default validation process.</p>
<p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">This function will be passed the following Parameters:</p><div class="mdetail-params" style="margin-top: 10px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 12px; font-size: 12px; "><ul style="margin-top: 12px; margin-right: 12px; margin-bottom: 12px; margin-left: 12px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; list-style-type: circle; list-style-position: inside; list-style-image: initial; "><li style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; list-style-position: inside; list-style-type: circle; list-style-image: initial; "><code style="font-style: normal; font-weight: normal; font-family: 'Lucida Console', 'Courier New', Courier, monospace; font-size: 12px; ">value</code>:
Mixed<div class="sub-desc" style="margin-top: 5px; margin-right: 5px; margin-bottom: 5px; margin-left: 16px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">The current field value[/list]
<p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">This function is to Return:</p><div class="mdetail-params" style="margin-top: 10px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 12px; font-size: 12px; "><ul style="margin-top: 12px; margin-right: 12px; margin-bottom: 12px; margin-left: 12px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; list-style-type: circle; list-style-position: inside; list-style-image: initial; "><li style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; list-style-position: inside; list-style-type: circle; list-style-image: initial; "><code style="font-style: normal; font-weight: normal; font-family: 'Lucida Console', 'Courier New', Courier, monospace; font-size: 12px; ">true</code>:
Boolean<div class="sub-desc" style="margin-top: 5px; margin-right: 5px; margin-bottom: 5px; margin-left: 16px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><code style="font-style: normal; font-weight: normal; font-family: 'Lucida Console', 'Courier New', Courier, monospace; font-size: 12px; ">true</code> if the value is valid
<li style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; list-style-position: inside; list-style-type: circle; list-style-image: initial; "><code style="font-style: normal; font-weight: normal; font-family: 'Lucida Console', 'Courier New', Courier, monospace; font-size: 12px; ">msg</code>:
String<div class="sub-desc" style="margin-top: 5px; margin-right: 5px; margin-bottom: 5px; margin-left: 16px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">An error message if the value is invalid[/list]