Setting a Control to Check

RadSpell can be configured to check any server or client-side editable element by setting the ControlToCheck property to the ID of the respective element. By default every instance of RadSpell can check only one control. However, you can configure RadSpell to check multiple controls at once.

Checking a Single Control

The easiest way set a control to check is by setting the ControlToCheck property directly in the RadSpell tag:

<asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
<telerik:RadSpell RenderMode="Lightweight" ID="RadSpell1" runat="server" ControlToCheck="TextBox1"/> 

Checking Multiple Controls at Once

Using the client-side API of the control you can setup a text source for checking multiple controls at one time:

<asp:ScriptManager ID="ScriptManager1" runat="server" />
<div>
    <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
    <telerik:RadSpell
        ID="RadSpell1"
        runat="server"
        ButtonType="PushButton"
        ControlToCheck="TextBox1"
        FragmentIgnoreOptions="All"
        SpellCheckProvider="PhoneticProvider"
        SupportedLanguages="en-US,English"
        WordIgnoreOptions="RepeatedWords">
    </telerik:RadSpell>

    <input type="button" onclick="startSpell();" value="Check all" class="button" />

<script type="text/javascript">

    function MultipleTextSource(sources) {
        this.sources = sources;

        this.get_text = function () {
            var texts = [];
            for (var i = 0; i < this.sources.length; i++) {
                texts[texts.length] = this.sources[i].get_text();
            }
            return texts.join("<controlSeparator><br/></controlSeparator>");
        }

        this.set_text = function (text) {
            var texts = text.split("<controlSeparator><br/></controlSeparator>");
            for (var i = 0; i < this.sources.length; i++) {
                this.sources[i].set_text(texts[i]);
            }
        }
    }

    function startSpell() {
        var sources =
        [
        new Telerik.Web.UI.Spell.HtmlElementTextSource($get('TextBox1')),
        new Telerik.Web.UI.Spell.HtmlElementTextSource($get('TextBox2'))
        ];

        var spell = $find('<%= RadSpell1.ClientID %>');
        spell.set_textSource(new MultipleTextSource(sources));
        spell.startSpellCheck();
    }

</script>
</div>