How to Create Custom MultiColumn Field Types in SharePoint 2010

Introduction

This article explains how to create Multicolumn Custom Field Types in SharePoint. Suppose we have a scenario like in our list there is a column Address that has the fields Country, State, City, ZipCode, Street Address and so on. So one solution is to create multiple fields in a SharePoint list for each field or we can create a custom multicolumn field that handles all fields as a single logical unit.

How

Now suppose our custom field name is MyAddressField that has the following fields:

  1. Street Address Line
  2. City
  3. State
  4. Country
  5. Zip Code

The following are the steps that are required to create a Multicolumn Custom Field Type:

  • Create an Empty SharePoint Project as a Farm solution named as MyAddressField
  • In the solution add a SharePoint Mapped Folder of Template-Control Template

    Share1.jpg

  • Now click on this Control Template Folder and add a user control named MyAddressRenderingTemplate.ascx
  • Add following code to the ascx file:
     

    <SharePoint:RenderingTemplaterunat="server"ID="MyAddressRenderingTemplate">

     <Template>

       <table>

         <tr>

           <td>Address Street:</td>

           <td><asp:TextBoxID="txtAddress"runat="server"/></td>

         </tr>

         <tr>

           <td>City:</td>

           <td><asp:TextBoxID="txtCity"runat="server"/></td>

         </tr>

         <tr>

         <td>State:</td>

         <td><asp:TextBoxID="txtState"runat="server"/></td>

         </tr>

         <tr>

           <td>Country:</td>

           <td><asp:TextBoxID="txtCountry" runat="server"/></td>

         </tr>

         <tr>

         <td>Zipcode:</td>

         <td><asp:TextBoxID="txtZipcode"runat="server"/></td>

         </tr>

       </table>

     

     </Template>

    </SharePoint:RenderingTemplate>
     
  • Add a class named MyAddress.cs and write the following code:
     

    publicclass MyAddress : SPFieldMultiColumn

    {

           public MyAddress(SPFieldCollection fields,

                                       string fieldName)

                :base(fields, fieldName) { }

     

           public MyAddress(SPFieldCollection fields,

                                       string typeName,

                                       string displayName)

                :base(fields, typeName, displayName) { }

     

           public overrideBaseFieldControl FieldRenderingControl

            {

               get

                {

                   BaseFieldControl ctr =new MyAddressFieldControl();

                    ctr.FieldName = this.InternalName;

                   return ctr;

                }

            }

     

           public overridestring GetFieldValueAsHtml(object value)

            {

               string HtmlLineBreak =@"<br />";

               SPFieldMultiColumnValue mColumnValue =

                 new SPFieldMultiColumnValue(value.ToString());

               string HtmlAddress = mColumnValue [0].ToString() + HtmlLineBreak;

               if (!string.IsNullOrEmpty(mcv[1]))

                {

                    HtmlAddress += mcv[1].ToString() + HtmlLineBreak;

                }

    HtmlAddress += mColumnValue [2].ToString() + ", " + mColumnValue [3] + "  " + mColumnValue [4];

               return HtmlAddress;

            }

    }

     

    publicclass MyAddressFieldControl : BaseFieldControl
     

    {

       protected overridestring DefaultTemplateName

        {

           get { return"MyAddressRenderingTemplate"; }

        }

       protected TextBox txtAddress;

       protected TextBox txtCity;

       protected TextBox txtState;

       protected TextBox txtCountry;

       protected TextBox txtZipcode;

     

       protected overridevoid CreateChildControls()

        {

           base.CreateChildControls();

            txtAddress =

                (TextBox)this.TemplateContainer.FindControl("txtAddress");

            txtCity =

                (TextBox)this.TemplateContainer.FindControl("txtCity");

            txtState =

                (TextBox)this.TemplateContainer.FindControl("txtState");

         txtCountry =

                (TextBox)this.TemplateContainer.FindControl("txtCountry");

            txtZipcode =

                (TextBox)this.TemplateContainer.FindControl("txtZipcode");

        }

     

       public overrideobject Value

        {

           get

            {

               this.EnsureChildControls();

               SPFieldMultiColumnValue mColumnValue =new SPFieldMultiColumnValue(5);

                    mColumnValue [0] = txtAddress.Text;

                    mColumnValue [1] = txtCity.Text.ToUpper();

                    mColumnValue [2] = txtState.Text;

                    mColumnValue [3] = txtCountry.Text;

                    mColumnValue [4] = txtZipcode.Text;

                   return mColumnValue;

                }

               set

                {

                   this.EnsureChildControls();

                   SPFieldMultiColumnValue mColumnValue =

                              (SPFieldMultiColumnValue)this.ItemFieldValue;

                    txtAddress.Text = mColumnValue [0];

                    txtCity.Text = mColumnValue [1];

                    txtState.Text = mColumnValue [2];

                    txtCountry.Text = mColumnValue [3];

                    txtZipcode.Text = mColumnValue [4];

                }

         }
    }
     

  • Add another SharePoint Mapped Folder. Right-click on the solution, click on the "Add" menu and now click on "SharePoint Mapped Folder". You need to choose the Template-->XML folder. Now it will add a folder named XML to your solution.

    Share2.jpg
     

  • Right-click on this XML folder and add an XML file named fldtypes_MyAddressFields.xml

    Add the following code inside this file.

    <FieldTypes>
     <
    FieldType>
        <
    FieldName="TypeName">MYAddress</Field>
        <FieldName="ParentType">MultiColumn</Field>
        <FieldName="TypeDisplayName">MY Address</Field>
        <FieldName="TypeShortDescription">My Address</Field>
        <FieldName="UserCreatable">TRUE</Field>
        <FieldName="ShowInListCreate">TRUE</Field>
        <FieldName="FieldTypeClass">
         
    MyAddressField.MyAddress,$SharePoint.Project.AssemblyFullName$
        </Field>
      </
    FieldType>
    </
    FieldTypes>

Finally the Project Structure will look like this:

Share3.jpg

Now deploy the solution and in your SharePoint site try to add a new column. You will then see there is a custom field named "MyAddressField". Add this column, you can find the multicolumn field when you try to insert a new record into your list.

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