icerge/UI Page Client script features.md

## UI Page Client script features.md

      
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              UI Page Client script features.md
            
          
    well, there is a nice book, listing many Jelly features. Although, I don't know if it is mentioned there
Goal - validate form field values
Alert message is get using 1 phase JAXL expression, JS: - prefix
function validateForm() {
 if (gel('first_name').value == '') {
  alert("${JS:gs.getMessage('Please input First Name')}");
  return false;
 }
}