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Ignoring custom text during spellchecking

PROBLEM

It is sometimes necessary to escape some text in order to process it programmatically later. Say we are creating an email template with name placeholders like this:

 Hi, <#FirstName#> <#LastName#>

We would not want the special symbols to be marked as SpellCheck errors.

SOLUTION

RadSpell that ships with RadEditor can have a custom definition of its client-side text source. We can define such a source that will transform the special symbols to something that looks like a HTML tag. Such tags are not processed by the SpellCheck engine, and you can replace them back after the corrections. The < and > symbols in the RadEditor contents area will be represented by their respective HTML entities -- > and <, so we need to define a text source that will skip those. We use some regular expressions to do that:

<telerik:RadEditor id="RadEditor1" 
    Runat="server">  
    <Tools>  
        <telerik:EditorToolGroup>   
            <telerik:EditorTool Name="CustomSpellCheck" Visible="true"  />  
        </telerik:EditorToolGroup>  
    </Tools>  
</telerik:RadEditor>    
<telerik:RadSpell ID="RadSpell1" runat="server" ButtonType="None" />     
<script type="text/javascript">  
   Telerik.Web.UI.Editor.CommandList["CustomSpellCheck"] = function(commandName, editor, args)  
    {  
            var spell = $find('<%=RadSpell1.ClientID %>');  
            spell.set_textSource(new SkippingTextSource(editor));  
            spell.startSpellCheck();  
    };  

    function SkippingTextSource(editor)  
    {  
        this.editor = editor;  
    }  
    SkippingTextSource.prototype.get_text = function()  
    {  
        var editor = $find("<%=RadEditor1.ClientID%>");  
        var text = editor.get_html();  
        var escaped = text.replace(/&lt;#([^#]+)#&gt;/g, "<?$1?>");  
        return escaped;  
    }  

    SkippingTextSource.prototype.set_text = function(text)  
    {  
        var editor = $find("<%=RadEditor1.ClientID%>");  
        var unescaped = text.replace(/<\?([^?]+)\?>/g, "&lt;#$1#&gt;");  
        editor.set_html(unescaped);  
    }  
</script>
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