12-Oct-2017 16:02valofestimatedsize.trim() =="") //till here the code is working fine var val Durationin Months New = SPUtility. Java Script provides a way to validate form's data on the client's computer before sending it to the web server. First let us see how to do a basic form validation.In the above form, we are calling validate() to validate data when onsubmit event is occurring.In this example, we are going to validate the name and password.
To check, whether the user entered correct form of data, it’s must to apply form validation in any of the form. The expression is: /^[a-z A-Z] $/ The above expression checks whether the input characters in the string is alphabet or not.Here I am giving you the form validation codes in Java Script. These are simple meta characters which do pattern matching. If the entered characters in the field is not in lower case or upper case. When it’s about checking contact field or zip code field, one need to check whether only the number have been entered or not.