SharePoint 2010 Validation using Javascript


Recently I had to do a custom validation for a Task Edit form based on task the user is performing. For example, if user chooses to Reject the proposal he needs to enter remarks else the remarks are not mandatory.

I had a look at the Save button on the Default Edit form, using the IE Developer tool and its “onclick” event looked something like this.

onclick=”if (!PreSaveItem()) return false;WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions(“9440_59e98$ctl00$toolBarTbl$ctl00$diidIOSaveItem”, “”, true, “”, “”, false, true))”

SharePoint checks for the PreSaveItem function before calling the save method. If the value returned from PreSaveItem is false it simply returns without doing anything.

After searching for PreSaveItem function, I found it in the ~\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\TEMPLATE\LAYOUTS\1033 folder\FORM.js file. The PreSaveItem function had the below definition.

function PreSaveItem()
alert('Inside PreSaveItem');
if("function"==typeof PreSaveAction)
	return PreSaveAction();
return true

So the PreSaveAction() function is our entry point to make any kind of validations. Put it in the Content Editor web part (or if you need to do some kind of Server side processing, put it in the SharePoint Web part)

I used it to get the value from hidden field (which was populated in the web part Page_Load method) and wrote the below function in the ascx file.

function PreSaveAction() {
var columnName = document.getElementById('<% =hdnMandatoryColumn.ClientID %>');
if (columnName != null && columnName.value != null) {
var column = getTagFromIdentifierAndTitle("input", "", columnName.value)

if (column.value == '') {
   alert(columnName.value + ' is a required field.');
   return false;
else {
   return true;

If you want to link the PreSaveAction function to a custom edit or new form, make sure that you call the PreSaveItem function as in default form and not PreSaveAction function directly.


About Rupesh

.NET and SharePoint 2010 developer
This entry was posted in Misc and tagged , , , , . Bookmark the permalink.

4 Responses to SharePoint 2010 Validation using Javascript

  1. Pingback: Pro Tip: Client Side Validation with Nintex Forms – Henry Chong

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