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Support for iPhone / iPad browser

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Rating: 4

Article information

Article relates to

 RadEditor for ASP.NET AJAX
 Telerik.Web.UI.dll

Created by

 Rumen Zhekov

HOW-TO
Provide support for iPhone / iPad browser.

DESCRIPTION
Safari for iPhone / iPad still does not offer a Rich Text Editing engine that the web WYSIWYG editors use to provide the ability to edit and format rich text content. The code solution below demonstrates how to replace the editor with a standard TextBox control when the page is browsed from an iPhone.

SOLUTION
Put RadEditor and a textbox on the page (the textbox should be hidden by default):

<asp:TextBox ID="textarea" TextMode="MultiLine" Rows="20" Columns="60" runat="server" Visible="false"></asp:TextBox> 
<telerik:RadEditor ID="editor" runat="server"></telerik:RadEditor> 
 

Here is a sample page that sets and gets the content in the editor or textbox depending on what the browser is (iPhone or other):

public string EditorContent 
{ 
    get 
    { 
        if (isiPhone()) 
        { 
            return textarea.Text; 
        } 
        else 
        { 
            return editor.Content; 
        } 
    } 
    set 
    { 
        if (isiPhone()) 
        { 
            textarea.Text = value; 
        } 
        else 
        { 
            editor.Content = value; 
        } 
    } 
} 
private bool isiPhone() 
{ 
    string userAgent = Request.Headers["User-Agent"]; 
    if (!string.IsNullOrEmpty(userAgent)) 
    { 
        return userAgent.ToLowerInvariant().Contains("iphone"); 
    } 
    else 
    { 
        return false; 
    } 
} 
private void SetControlsVisibility() 
{ 
    textarea.Visible = isiPhone(); 
    editor.Visible = !isiPhone(); 
} 
    protected void Page_Load(object sender, EventArgs e) 
{ 
    if (!IsPostBack) 
    { 
        SetControlsVisibility(); 
        //set initial content 
        EditorContent = "initial content"; 
    } 
    else 
    { 
        //postback - Update content in database 
        string content = EditorContent; 
        //...code that updates DB 
    } 
} 

The above code checks whether an iPhone is used on the first request and hides/shows the appropriate control. It also abstracts the editor content in a separate property (EditorContent) so you can use it anywhere on the page and have only one check for the browser/device.


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