Archive for category SharePoint Development

JavaScript page load function array and pre save function in SharePoint 2010

JavaScript page load function

I have been using this function array forever, but still whenever I need it, I have to look it up on internet, so decided to post it here.

In case you are new to SharePoint,  because mostly SharePoint pages don’t contain body element because it comes from master page, so this is the way to run your page body load event code in SharePoint. Add your function name to “_spBodyOnLoadFunctionNames” function array, and your function will be called when page body is loaded.


function pageOnLoad()
// Your code here


Pre Save Custom Script

Another important function which I managed to forget when I was recently customizing a list item page, is PreSaveItem function. It is for writing custom client side script when “Save” button is pressed on New or Edit Item page in SharePoint.

function PreSaveItem()
return true // or return false;

Return true of you want the saving process to continue or return false otherwise.

Get Element by Tag and  Title

One more very useful function is the one which gets an element by its tag name and title, here it is

function getElementFromTitle(tagName, title)
     var tags = document.getElementsByTagName(tagName);   
     for (var i=0; i < tags.length; i++)   
         if (tags[i].title == title)      
             return tags[i];      
     return null;

But if you are using JQuery, the following line replaces the above function

var subjectValue = $("input[title='ElementTitle']").val();

(“input” is the type of control)

Using JQuery you can go to any length to find something in the page markup, like the one below returns text from rich text field in SharePoint

var descriptionValue = $("textarea[Title='ElementTitle']").closest("span")
  .find("iframe[Title='Rich Text Editor']").contents().find("body").html();


SP Services by Marc D Anderson

Here’s some cool stuff by Marc D Anderson

This is a library which is based on JQuery, it makes making cascading drop downs amazingly easy.

After you have referenced JQuery and SPService in your page, it’s just the following code which configures a cascading drop down

<script type="text/javascript">
    $(document).ready(function() {
            relationshipList: "Regions",
            relationshipListParentColumn: "Country",
            relationshipListChildColumn: "Title",
            parentColumn: "Country",
            childColumn: "Region"

Thanks Marc, for this amazing stuff.


Warn users of double booking in SharePoint calendar in real time

Recently I came across this situation where in our room booking system we needed to warn users of parallel booking, but didn’t want to stop them from making the booking because in many cases they are agreed between parties.

Initially it didn’t look like a big deal because I had Client-side Object Model which I could use in JavaScript, but I couldn’t achieve the whole functionality in JavaScript. I would explain down my post why I couldn’t write the whole solution in JavaScript, and I had to go for Server-side code.

Finally I was able to achieve the following (click on the picture to see the big version)

The thing which makes this solution interesting is that Id’s of the date controls are handled differently by SharePoint in this page. If you inspect the source of the new item page of the calendar, you will notice that the controls id’s are kept in an array in JavaScript. You can see the array declaration in the source

 <script type="text/// <![CDATA[
">var g_strDateTimeControlIDs = new Array();
// ]]>

And then it’s used to store id’s of the calendar controls like start date

 <script type="text/javascript">
g_strDateTimeControlIDs["SPEventDate"] = "ctl00_m_g_089e7bbe_83d6_4e8a_ab8f_ca7ca3d3d0cc_ff31_ctl00_ctl00_DateTimeField_

And for end date

 <script type="text/javascript">
g_strDateTimeControlIDs["SPEndDate"] = "ctl00_m_g_089e7bbe_83d6_4e8a_ab8f_ca7ca3d3d0cc_ff41_ctl00_ctl00_DateTimeField_

Hours and Minutes drop downs’ id’s are same except “Hours” and “Minutes” appended in the end of the above id’s.

The final solution consists of the following components;

1. Changing ScriptManager tag in master page to allow page methods

2. Changing web.config to add PageParser element to allow server-side code in the page

3. Creating a new item page for calendar

4. Changing the newitem page

5. Writing some javascript

6. Writing a page method in C#

The only reason I used page method in C# is that I couldn’t run the following query in JavaScript, I am still trying for this, and if I get lucky I would love to remove the server-side code from this solution

SPQuery query = new SPQuery();

query.ExpandRecurrence = true;

query.Query = "<FieldRef Name='EventDate' />";

query.CalendarDate = new DateTime( startDateTime.Year, startDateTime.Month, startDateTime.Day);

1. ScriptManager tag is already in the v4.master, but it has page methods disabled, we need to first enable the page methods by changing the “EnablePageMethods” attribute to “true” and it should then look like this;

ScriptManager id="ScriptManager" runat="server" EnablePageMethods="true" EnablePartialRendering="true" EnableScriptGlobalization="false" EnableScriptLocalization="true" />

by enabling this you can add static page methods to an ASP.NET page and mark them as Web methods. You can then call these methods from script as if they were part of a Web service, but without creating a separate .asmx file.

If you don’t want to enable Page Methods in master page, then you can add “ScriptManagerProxy” control in your page, it’s because a page can contain only one ScriptManager control in its hierarchy and v4.master already has one.

2. Now change the web.cofig for the site to add a PageParser element, so that our page can call server-side code



<PageParserPath VirtualPath=”/Team/Lists/Calendar/CustomNewEvent.aspx” CompilationMode=”Always” AllowServerSideScript=”true” />




3. Create a custom new item page for calendar in SharePoint designer, it’s easy to do and I won’t be able to explain how to do it here.

4. Open the custom new item page in advance mode in SharePoint designer and scroll down to the place where there’s a table row (i.e) for “End Time” and add the following table row


 <span id="TimeOverlapLabel">  



I wanted to show the message below “End Time” but you can show it anywhere on the page and I did the styling in CSS, it’s all your choice.

Now search for place holder id “PlaceHolderAdditionalPageHead”, and the add the following inside the content tag

<asp:Content ContentPlaceHolderId=”PlaceHolderAdditionalPageHead” runat=”server”>

// <![CDATA[
// ]]>
<script type=”text/c#” runat=”server” src=”../../Script/calendar.cs”></script>
<script language=”javascript” type=”text/javascript”>
function OnLoad(){
// Calendar is the name of the Calendar list, I am passing the name of the list
// so that I can call this code from any Calendar library  
FindOverlappedEvents(“Calendar”); } 


I have only shown the code I have added inside the above content tag, there would be more already in there which you might not want to change.

Calendar.js and Calendar.cs are the files I have added in the scripts folder on the root of the site, by selecting “All Files” in the left navigation in SPD and creating a folder on the root, you can of course choose to store them somewhere else but remember to use the correct path in the above code.

5. Now add the following code in Calendar.js, the way I create a new .js or .cs in SharePoint designer is by creating a new css files and then renaming it.  it’s because SharePoint designer gives you option to create only HTML, ASPX or CSS in a given folder.

var g_eventOverlapped = false;

function PreSaveAction()


// This is in case user presses save button right after selecting date and time

// Remember: our code runs on onblur even of date and time controls

if(g_eventOverlapped == true) {

 return confirm(“Your selected time overlaps with an existing booking!\nIf you want to change the time, press ‘Cancel'”);


 return true;


// This function is called from OnLoad of the form, it binds event handerl to the date and time controls

// onblur is the only event which works on these controls

function FindOverlappedEvents(listName)


var startDate = document.getElementById(g_strDateTimeControlIDs[“SPEventDate”]);

 var startHours = document.getElementById(g_strDateTimeControlIDs[“SPEventDate”]+”Hours”);

 var startMinutes = document.getElementById(g_strDateTimeControlIDs[“SPEventDate”]+”Minutes”);

 if(startDate != null && startHours != null && startMinutes != null)


 startDate.onblur = function(){validateDates(listName);};

 startHours.onblur = function() {validateDates(listName);};

 startMinutes.onblur = function() {validateDates(listName);};


 var endDate = document.getElementById(g_strDateTimeControlIDs[“SPEndDate”]);

 var endHours = document.getElementById(g_strDateTimeControlIDs[“SPEndDate”]+”Hours”);

 var endMinutes = document.getElementById(g_strDateTimeControlIDs[“SPEndDate”]+”Minutes”);

 if(endDate != null && endHours != null && endMinutes != null)


 endDate.onblur = function(){validateDates(listName);};

 endHours.onblur = function() {validateDates(listName);};

 endMinutes.onblur = function() {validateDates(listName);};


// validate initially when new item window opens, because by default date and time are selected



// This gets called every time onblur is fired on controls

function validateDates(listName)


var startDateCtl = document.getElementById(g_strDateTimeControlIDs[“SPEventDate”]);

 var startHoursCtl = document.getElementById(g_strDateTimeControlIDs[“SPEventDate”]+”Hours”);

 var startMinutesCtl = document.getElementById(g_strDateTimeControlIDs[“SPEventDate”]+”Minutes”);

 var startHour = startHoursCtl.options[startHoursCtl.selectedIndex].value

 var startMinutes = startMinutesCtl.options[startMinutesCtl.selectedIndex].value

 var endDateCtl = document.getElementById(g_strDateTimeControlIDs[“SPEndDate”]);

 var endHoursCtl = document.getElementById(g_strDateTimeControlIDs[“SPEndDate”]+”Hours”);

 var endMinutesCtl = document.getElementById(g_strDateTimeControlIDs[“SPEndDate”]+”Minutes”);

 var endHour = endHoursCtl.options[endHoursCtl.selectedIndex].value

 var endMinutes = endMinutesCtl.options[endMinutesCtl.selectedIndex].value

 // here is the call to the server-side method, which comes back to either OnCallComplete(result) or OnCallError(error)

PageMethods.GetCalendarOverlap(listName, startDateCtl.value, startHour,startMinutes,endDateCtl.value,endHour,endMinutes,OnCallComplete,OnCallError);


function OnCallComplete(result)


if(result != “”)


document.getElementById(“TimeOverlapLabel”).innerHTML = “Booking Error”;

document.getElementById(“TimeOverlap”).innerHTML = result;

// this makes sure that we’ve covered this event

g_eventOverlapped = true;








document.getElementById(“TimeOverlapLabel”).innerHTML = “”;


document.getElementById(“TimeOverlap”).innerHTML = “”;

// this makes sure that we’ve covered this event

g_eventOverlapped = false;




function OnCallError(error)


if(error !== null)


document.getElementById(“TimeOverlap”).innerHTML = “There’s an error checking for duplicate events”;


6. Create Calendar.cs in the Scripts folder and add the following code;


public static string GetCalendarOverlap(string listName, string startDate, string startHour, string startMinutes, string endDate, string endHour, string endMinutes)




SPWeb web = SPContext.Current.Web;

SPList calendarList = web.Lists[listName];

// Construct a query that expands recurring events

SPQuery query = new SPQuery();

// If I could run the following CAML in JavaScript using SharePoint Object Model, I wouldn’t have gone for server side code.

query.ExpandRecurrence = true;

query.Query = “<FieldRef Name=’EventDate’ />”;

startHour = startHour.TrimEnd(“:”.ToCharArray());

string[] startDateParts = startDate.Split(“/”.ToCharArray());

DateTime startDateTime = new DateTime(int.Parse(startDateParts[2]), int.Parse(startDateParts[1]), int.Parse(startDateParts[0]), int.Parse(startHour), int.Parse(startMinutes), 0);

endHour = endHour.TrimEnd(“:”.ToCharArray());

string[] endDateParts = endDate.Split(“/”.ToCharArray());

DateTime endDateTime = new DateTime(int.Parse(endDateParts[2]), int.Parse(endDateParts[1]), int.Parse(endDateParts[0]), int.Parse(endHour), int.Parse(endMinutes), 0);

query.CalendarDate = new DateTime( startDateTime.Year, startDateTime.Month, startDateTime.Day);

// Returns all items (including recurrence instances) that

// would appear in the calendar view for the current day

SPListItemCollection calendarItems = calendarList.GetItems(query);

DateTime eventStartDateTime;

DateTime eventEndDateTime;

string eventTitle;

bool timeOverlap = false;

string events = string.Empty;

foreach (SPListItem item in calendarItems)


eventStartDateTime = DateTime.Parse(item[“EventDate”].ToString());

eventEndDateTime = DateTime.Parse(item[“EndDate”].ToString());

eventTitle = (string)item[“Title”];

timeOverlap = false;

//if newstartdate >= eStartDate and newStartDate < eEndDate

if(startDateTime >= eventStartDateTime && startDateTime < eventEndDateTime)


timeOverlap = true;


//if newEndDate > eStartDate and newEndDate <= eEndDate

else if(endDateTime > eventStartDateTime && endDateTime <= eventEndDateTime)


timeOverlap = true;


// if eStartDate >= newStartDate and eStartDate < newEndDate

else if(eventStartDateTime >= startDateTime && eventStartDateTime < endDateTime)


timeOverlap = true;


// if eEndDate > newStartDate and eEndDate <= newEndDate

else if(eventEndDateTime > startDateTime && eventEndDateTime <= endDateTime)


timeOverlap = true;


// if newStartDate = eStartDate and newEndDate = eEndDate

else if (startDateTime == eventStartDateTime && endDateTime == eventEndDateTime)


timeOverlap = true;



if(timeOverlap == true)


// This HTML decoration is better done at the client side, but I was being lazy and did it here

events += “ Title : “+ eventTitle +”

events += “Start Date: “+ item[“EventDate”].ToString() +”
End Date: ” + item[“EndDate”].ToString() + ”

events += “Created By: ” + item[“Author”].ToString().Split(“#”.ToCharArray())[1] + ”




if(events != string.Empty)


events = “Time Overlap Warning!<br/>Your selected time overlaps with the following booking(s);<br/><br/>”+events;


return events;


catch(Exception ex)


throw ex;




Remove hyperlink from Lookup column in SharePoint

For whatever reason if you don’t want users to be able to click on a lookup column in a list, there’s no straight forward method of disabling that link. Here’s the way I disable them in SharePoint 2010, and it wasn’t any different in 2007 either apart from fancy UI.

In the image below, Country is a lookup type of column


 Open the list view in SharePoint designer for modification


 Select the lookup column item and in the document map bar in the bottom, choose the context menu for “xsl:value-of”, and select “Edit Tag…”

You will see the “Edit Tag” window

The above XPath “$thisNode/@*[name()=current()/@Name]” when executed, returns the following hyper link tag

<a onclick=”OpenPopUpPage(‘http://servername/_layouts/listform.aspx?PageType=4&ListId={9CF20D94-56E4-426B-AAA3-97CEA2B23570}&ID=3&RootFolder=*’,RefreshPage); return false;”href=”http://servername/_layouts/listform.aspx?PageType=4&ListId={9CF20D94-56E4-426B-AAA3-97CEA2B23570}&ID=3&RootFolder=*”>United States</a>

In order to get the clean value which is in this case “United States”, we need to remove the decoration around it, so we are going to remove everything before ‘>‘ and after ‘<‘ by changing the tag in the Quick Tag Editor to

<xsl:value-of select=”substring-before(substring-after($thisNode/@*[name()=current()/@Name],’&gt;’), ‘&lt;’)” disable-output-escaping=”yes”>

Then press the tick button on the “Quick Tag Editor” to save the modified tag, save the page and view it in browser

Links are gone.

Neat, isn’t it?