By default, SharePoint can do some simple validations to SharePoint list field data such as "Required Field" on server side when you submit form. But users often need list field data validations of various kinds on client side. For instance, when submitter creates a task and input data in a SharePoint task list form, administrator may want him to be noticed on the client side if the data of "Start Date" column is later than "End Date" column. In such a case, SharePoint Form Validation can help administrators achieve it.
SharePoint Form Validation can be used on almost all kinds of lists. For most columns in a list, users can apply standard validation methods such as "Required Validation", "Compare Validation", "Regular Expression Validation" and "Range Validation" on columns. SharePoint Form Validation can take effect in the SharePoint list item New Form page or Edit Form page.
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