zaterdag 9 oktober 2010

Get value from Checkboxlist clientside using Javascript

My latest (SharePoint) assignment was to modify the OOB “Send to –> Other location” functionality. The customer wanted to select the target lists using a checkboxlist control instead of having to type URL’s manually. To make this work I made a copy of the application page Copy.aspx and modified it slightly. It turned out that SharePoint was doing some clientside checks, for which it needed the value of the selected items in my checkboxlist control.

Quite some searching and Googling taught me that it is not possible to retrieve the value clientside using the standard checkboxlist control, but I did find a way to retrieve the value from a checkboxcontrol. To make this possible I needed to make my very own control.

This custom control should be made in the following way:

namespace Your.NameSpace
    public class CustomCheckBoxListControl : CheckBoxList, IRepeatInfoUser
        void IRepeatInfoUser.RenderItem(ListItemType itemType, int repeatIndex, RepeatInfo repeatInfo, HtmlTextWriter writer)
            writer.WriteAttribute("type", "checkbox");
            writer.WriteAttribute("name", UniqueID + "$" + repeatIndex);
            writer.WriteAttribute("id", ClientID + "_" + repeatIndex.ToString(NumberFormatInfo.InvariantInfo));
            writer.WriteAttribute("value", Items[repeatIndex].Value);
            System.Web.UI.AttributeCollection attrs = Items[repeatIndex].Attributes;
            foreach (string key in attrs.Keys)
                writer.WriteAttribute(key, attrs[key]);


As you can see, the value from the listitem is rendered along with the rest of the standard HTML. This means that we can now access the value clientside. Just to be complete, the javascript to retrieve the value of the first checked item could look like this:

var checkedItemValue;

for (i = 0; i < 100; i++)
    var checkbox = document.getElementById("<%SPHttpUtility.NoEncode(myCheckBoxList.ClientID,Response.Output);%>_" + i );

    if (checkbox == null)

    if (checkbox.checked)
        checkedItemValue = checkbox.value;

zaterdag 2 oktober 2010

SharePoint custom field type which shows an image


One of my present assignments is to make a custom field type. This field should be showing images in the listview webpart depending on the text value it holds. Now this should be easy to do right? Wrong… for some reason I could not get this to work.

What I want is a completely standard textfield that renders an image for certain texts. There are many blogs describing on how to do this. What I missed though is the fact that you must set <CAMLRendering> to TRUE if you want your HTML to show in the listview webpart.

This is described in MSDN: They state that:

Optional Boolean. The default is FALSE. Specifies whether the field is rendered on list views using the CAML markup in a RenderPattern element elsewhere within the parent FieldType element. The default FALSE means that the field is rendered on list views by an XSL transform in a fldtypes*.xsl file, which is the standard system for field rendering on list views. (However, this element has no effect on field rendering on Display, New, and Edit forms. A RenderPattern would still be the standard way of rendering the field on a Display form.)

My fieldref_.xml looked like this:

<?xml version="1.0" encoding="utf-8" ?>
    <Field Name="TypeName">YourTypeName</Field>
    <Field Name="ParentType">Text</Field>
    <Field Name="TypeDisplayName">xxx</Field>
    <Field Name="TypeShortDescription">xxx.</Field>
    <Field Name="UserCreatable">TRUE</Field>
    <Field Name="Sortable">FALSE</Field>
    <Field Name="AllowBaseTypeRendering">TRUE</Field>
    <Field Name="Filterable">FALSE</Field>
    <Field Name="CAMLRendering">TRUE</Field>
    <Field Name="FieldTypeClass">Some.Namespace.AndClass, Some.Assembly, Version=, Culture=neutral, PublicKeyToken=87iu1765432ade40</Field>
    <RenderPattern Name="DisplayPattern">
        <Case Value="Text1">
          <HTML><![CDATA[<img src="/_layouts/IMAGES/myImage.png" />]]></HTML>
        <Case Value="Text2">
          <HTML><![CDATA[<img src="/_layouts/IMAGES/OtherImage.png" />]]></HTML>
          <HTML><![CDATA[<span>No Value</span>]]></HTML>

dinsdag 28 september 2010

Hiding the masterpage in SharePoint


Today I needed to hide the masterpage in modal popup that was showing a SharePoint layouts page. I used a redirect within the modal popup from one page to another. This redirect made the masterpage appear in de modal, which I didn’t want.

To make sure the masterpage is not showed the URL paramter (querystring) “isDlg=1” should be added.

So for instance an possible URL is:

maandag 30 november 2009

Wortell Blog

The company I work for Wortell, has a new company blog. This blog will be written by many of my colleagues and can be found at this URL: It will contain blog posts about SharePoint 2010, OCS, Programming, and many more subjects.


donderdag 26 november 2009

Hide the root node of an ASP.NET Treeview control

When using a XmlDataSource object as the datasource of your treeview control, it can be a challenge to hide the root node of the review. (it was for me… )

I found (on this blog)that the XmlDataSource class has a property called Xpath. Assign this property the value of “/*/*” and your root node will be hidden. Pretty easy, isn’t it…

donderdag 12 november 2009

SharePoint – JavaScript OnLoad

Today I needed to fire some JavaScript code when a SharePoint page loaded. There are several ways to do this as far as I can tell, but there is only one way which I liked. After your JavaScript code you should include the following code:

_spBodyOnLoadFunctionNames.push("your method");

My customer needed a (pop-up) page that was printed and closed immediately after it was opened. I did this in the following way:

StringBuilder script = new StringBuilder();
script.Append("function onLoad()");
script.Append("  window.print();");
script.Append("  window.close();");

You should of course not forget to register your JavaScript. :-)

woensdag 21 oktober 2009

SP2010 - Application pages and dynamic masterpages

Remember waaay back when SharePoint 2007 was still used and we could not change the masterpage for application pages. Well, all that has changed. Application pages dynamically adapt to the masterpage of the site they're in.

I can name a bunch of customers who will be very happy with this... :-)