This post will describe a possible solution to handle check out of list items when editing. This will prevent others from making changes to the list item while another person has the same item already open in EditForm.

This solution is intended used in EditForm, and requires you to add one new field to the list: A yes/no column named (for example) “CheckedOut”.

Currently this requires four rules added to DFFS, but I might consider building in support for this so that this would just require a “tick in a box” to enable.

Please note a typo in “promptCheckin” – use lover case “i” to correspond with the function in the Custom JS below.

var dffs_beforeunload = true;

function goToDispForm(){
	dffs_beforeunload = false;
	$("#part1").hide();
	location.href = location.href.replace(/editform.aspx/i,"DispForm.aspx");
}

function mustCheckOut(){
	dffs_beforeunload = false;	
	if(confirm("You must check out this item to proceed.\n\nCheck out this item now?")){
		var res = spjs_updateItem({"listName":_spPageContextInfo.pageListId,"id":GetUrlKeyValue("ID"),"data":{"CheckedOut":"1"}});
		if(res.success){
			location.href = location.href;
		}else{
			alert(res.errorText);
		}
	}else{
		goToDispForm();
	}
}

function promptCheckin(){
	dffs_beforeunload = false;	
	if(getFieldValue("CheckedOut") === true){
		if(confirm("Do you want to check in this item to allow otheres to contribute?")){
			setFieldValue("CheckedOut",false);
		}
	}
}

$(window).bind("beforeunload",function(event) {
	if(dffs_beforeunload){
		var res = spjs_updateItem({"listName":_spPageContextInfo.pageListId,"id":GetUrlKeyValue("ID"),"data":{"CheckedOut":"0"}});
		if(res.success){
			alert("The list item was checked in.");
		}else{
			alert(res.errorText);
		}
	}
});

// Fix for add attachment in IE 8 / 9 on SharePoint 2007
$("a[href^='javascript:UploadAttachment()']").hover( 
	function(){
		dffs_beforeunload = false;
	},
	function(){
		dffs_beforeunload = true;
	}	
);

Please use the forum for any discussions

Alexander