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Saturday, January 5, 2013PrintSubscribe
Interacting with the Client Library

Server-side code can take advantage of the application client library by registering snippets of JavaScript rendered on the server.

Let’s set up a user control with a button. When the button is pressed, an alert will be shown and a message displayed in the message bar at the top of the page.

Creating User Control

Start the Project Designer. On the Project Explorer toolbar, click on the New Page icon.

Creating a new page using the icon on the Project Explorer toolbar.

Assign a name:

Property Value
Name Test

Press OK to save. Drop Test page node on the right side of Home page node to place it second in the hierarchy.

Dropping 'Test' page node on the right side of 'Home' page node.     Page 'Test' has been placed second in the hierarchy.

Right-click on the page, and press New Container.

Creating a new container for page 'Test'.

Preserve the default values and press OK to save.

Right-click on the new container, and press New Control.

Creating a new control.

Next to the User Control lookup in the Project Browser, click on the New User Control icon.

Creating a new user control using the 'New User Control' icon.

Assign the user control a name:

Property Value
Name DisplayAlert

Press OK to save the user control and insert it. Press OK again to save the control.

Modifying the User Control

On the toolbar, press Browse to generate the user control file. When complete, right-click on Test / c101 / control1 – DisplayAlert node, and press Edit in Visual Studio.

Editing the user control in Visual Studio.

The user control will open in Visual Studio. Press Ctrl+K, Ctrl+D keyboard shortcut to format. Replace the code after the <%@ Control %> element with the following:

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>
        <div style="margin: 2px; border: solid 1px silver; padding: 8px;">
            <asp:Button ID="Button1" runat="server" 
                OnClick="Button1_Click" Text="Button" />
        </div>
    </ContentTemplate>
</asp:UpdatePanel>

The user control will display a button that will perform the “Button1_Click” method handler when pressed. In the Solution Explorer, double-click on ~\Controls\DisplayAlert.ascx\DisplayAlert.ascx.cs file. Add the following method to the file:

C#:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Controls_DisplayAlert : System.Web.UI.UserControl
{
    
    protected void Page_Load(object sender, EventArgs e)
    {
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        ScriptManager.RegisterStartupScript(this.Page,
            this.Page.GetType(), "test1",
            "alert('hello')", true);
        ScriptManager.RegisterStartupScript(this.Page,
            this.Page.GetType(), "test2",
            "Web.DataView.showMessage('hello')", true);
    }
}

Visual Basic:

Imports System
Imports System.Collections.Generic
Imports System.Linq
Imports System.Text.RegularExpressions
Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls


Partial Public Class Controls_DisplayAlert
    Inherits Global.System.Web.UI.UserControl
    
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    End Sub
    Protected Sub Button1_Click(ByVal sender As Object,
                                ByVal e As EventArgs)
        ScriptManager.RegisterStartupScript(Me.Page, Me.Page.GetType(),
                                            "test1", "alert('hello')", True)
        ScriptManager.RegisterStartupScript(Me.Page, Me.Page.GetType(),
                                            "test2", "Web.DataView.showMessage('hello')", True)
    End Sub
End Class

The method will show an alert using the standard alert method. A message is shown at the top of the page with the help of the client library method Web.DataView.showMessage. Save the file, and switch to the web application.

Viewing the Results

Navigate to the Test page. Click on the button in the center of the page. An alert will open with the text “hello”.

image

Press OK to dismiss the alert. A message will be displayed at the top of the page with the text “hello”.

image

Friday, January 4, 2013PrintSubscribe
Displaying Current User Name as a Virtual Field

Suppose that you need to display the name of the current user. Let’s implement a virtual field that will display the current user name on the Customers form.

Start the Project Designer. In the Project Explorer, switch to the Controllers tab. Right-click on Customers / Fields node, and press New Field.

Creating a new field in Customers controller.

Use the following values:

Property Value
Name CurrentUserName
Type String
Length 40
Allow null values. true
The value of this field is computed at run-time by SQL expression. true
SQL Formula
@BusinessRules_UserName
Label Current User
Values of this field cannot be edited. true

Press OK to save.

Let’s add this field to the edit form. Drop Customers / Fields / CurrentUserName (String(40)), read-only) node onto Customers / Views / editForm1 node. This will instantiate a CurrentUserName data field.

Dropping 'CurrentUserName' field on view 'editForm1'.     Data field 'CurrentUserName' instantiated in view 'editForm1'.

On the toolbar, press Browse. Navigate to the Customers page and select a record. The Current User data field will display the user name at the bottom of the form.

'Current User' displays the current user name at the bottom of the form.

Log out, and log in as user / user123%. The current user will change to reflect the current user account.

The current user value has been updated.

Thursday, January 3, 2013PrintSubscribe
Restrict Access to Fields with “Roles” Properties

The Read Roles and Write Roles properties for a field allow specifying a list of roles. Users that do not have a role in the list will not be able to view or edit the field, respectively.

Let’s prevent non-administrators from editing the Phone field in Customers controller or viewing the Address fields.

Controlling Editing Rights for Phone Field

Start the Project Designer. In the Project Explorer, switch to the Controllers tab. Double-click on Customers / Fields / Phone node.

Field 'Phone' selected in Customers controller.

Change the Write Roles property:

Property New Value
Write Roles Administrators

Press OK to save.

Controlling Visibility for Address Fields

Double-click on Customers / Fields / Address (String(60)) node.

Address field of Customers controller.

Change the following:

Property New Value
Read Roles Administrators

Press OK to save. Make the same change to these fields as well: City, Region, PostalCode, Country.

Viewing the Results

On the toolbar, press Browse.

Log in with the standard user account (user / user123%) and navigate to the Customers page. Note that none of the address fields are displayed in the grid.

No address fields displayed in grid1 of Customers controller when logged in as 'user'.

Select a record and start editing. Note that the Phone field is read-only.

Phone field is not editable.

Log out, and log in again with the administrative account (admin / admin123%). Start editing a record – Phone and Address fields will be editable.

Alladdress fields displayed in grid1 and Phone is editable on Customers page when logged in as 'admin'.