It is used to make webpages interactive and provide online programs, including video games.
The plugin presented here extends the Validation plugin to allow Datepicker fields to be validated before submission.
In this article Creating and Validating Formulas Custom Field Formulas and Localization Formula References to Resource, Project, and Task Fields Errors in Formulas Custom field values and graphical indicator values in Microsoft Project 2010 can be calculated by using formulas.
You can create formulas for local custom fields by using Microsoft Project Standard 2010 or Microsoft Project Professional 2010 and for enterprise custom fields by using Project Web App or the Project Server Interface (PSI).
It has an API for working with text, arrays, dates, regular expressions, and basic manipulation of the DOM, but does not include any I/O, such as networking, storage, or graphics facilities, relying for these upon the host environment in which it is embedded.
Initially only implemented client-side in web browsers, Java Script engines are now embedded in many other types of host software, including server-side in web servers and databases, and in non-web programs such as word processors and PDF software, and in runtime environments that make Java Script available for writing mobile and desktop applications, including desktop widgets.