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POCreating an AJAX Script Control
 

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  1. POCreating an AJAX Script Control
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    <p>Call me a 'n00b', but I am new to creating Script Controls. I want to create a simple control with 3 text boxes. I have a .cs file that looks like this:</p> <pre><code> public class SmokingCalc : ScriptControl { public SmokingCalc() { Render(htmlWriter); } protected override void Render(HtmlTextWriter writer) { costTextbox.RenderControl(writer); base.Render(writer); } protected override IEnumerable&lt;ScriptDescriptor&gt; GetScriptDescriptors() { ScriptControlDescriptor descriptor = new ScriptControlDescriptor("SmokingCalc.SmokingCalc", this.ClientID); yield return descriptor; } // Generate the script reference protected override IEnumerable&lt;ScriptReference&gt; GetScriptReferences() { yield return new ScriptReference("SmokingCalc.SmokingCalc.js", this.GetType().Assembly.FullName); } protected HtmlTextWriter htmlWriter; protected TextBox costTextbox; protected TextBox amountTextbox; protected TextBox yearsTextbox; protected Button submitButton; } } </code></pre> <p>and I have absolutely no idea why the textbox wont render? I think I am missing something...</p> <p>[EDIT] The error I'm getting is the "Object reference is not set to an instance to an object".</p> <p>[ANSWERED] I changed the file as follows, and it works, so far at least.</p> <pre><code> public class SmokingCalc : ScriptControl { public SmokingCalc() { } protected override void CreateChildControls() { base.CreateChildControls(); costTextbox.ID = "costTextbox"; amountTextbox.ID = "amountTextbox"; yearsTextbox.ID = "yearsTextbox"; submitButton.ID = "submitButton"; submitButton.Text = "Submit"; Controls.Add(costTextbox); Controls.Add(amountTextbox); Controls.Add(yearsTextbox); Controls.Add(submitButton); } protected override IEnumerable&lt;ScriptDescriptor&gt; GetScriptDescriptors() { ScriptControlDescriptor descriptor = new ScriptControlDescriptor("SmokingCalc.SmokingCalc", this.ClientID); descriptor.AddProperty("costTextboxID", costTextbox.ClientID); descriptor.AddProperty("amountTextboxID", amountTextbox.ClientID); descriptor.AddProperty("yearsTextboxID", amountTextbox.ClientID); descriptor.AddProperty("submitButtonID", submitButton.ClientID); yield return descriptor; } // Generate the script reference protected override IEnumerable&lt;ScriptReference&gt; GetScriptReferences() { yield return new ScriptReference("SmokingCalc.SmokingCalc.js", this.GetType().Assembly.FullName); } protected TextBox costTextbox = new TextBox(); protected TextBox amountTextbox = new TextBox(); protected TextBox yearsTextbox = new TextBox(); protected Button submitButton = new Button(); } </code></pre>
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    1. COTry to instantiate your controls before you add 'em. Eg costTextbox = new Textbox();
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    2. COworks great. Thanks!
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