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PODynamically Adding ASP.NET Validation Controls
 

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  1. PODynamically Adding ASP.NET Validation Controls
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    <p>Having a little bit of trouble, that I've been trying to figure out for a few hours now.</p> <p>I have three panels, two of which are visible=false at any given time. Two of the three panels have text boxes that require validation of user input. The code below loops through all the controls in all three panels and creates two validation controls for each text box.</p> <p>The first panel, Settings, only allows numbers. Both Validations catch errors as intended.</p> <p>the second panel, ConfigImages, has three textboxes. Two allow text/numbers/Limited symbols and requires an input. The third Requires an URL. The Validators are not firing on these text boxes.</p> <p>Any Ideas why these validators aren't firing?</p> <p>Code-behind</p> <pre><code> //Initialize page validation foreach (Panel p in this.Form.Controls.OfType&lt;Panel&gt;().ToList()) { foreach (TextBox ctrl in p.Controls.OfType&lt;TextBox&gt;().ToList()) { //add a new RequiredFieldValidator for each textbox this.Form.Controls.Add(new RequiredFieldValidator() { //set the properties of the new RequiredFieldValidator ControlToValidate = ctrl.ID.ToString(), Display = ValidatorDisplay.None, Enabled = true, ErrorMessage = ctrl.ID.Substring(3) + " Field cannot be empty" } ); //Add a new RegularExpressionValidator for each textbox this.Form.Controls.Add(new RegularExpressionValidator() { //set the properties of the new RegularExpressionValidator ControlToValidate = ctrl.ID.ToString(), Display = ValidatorDisplay.None, Enabled = true, ErrorMessage = ctrl.ID.Substring(3) + " field has invalid characters", //Double Ternary Allows 0-255 for all Settings textbox , a-zA-Z0-9'!#$%&amp;'*+/=?^_`{|}~.- for Slide Text //or URL for URL textbox ValidationExpression = (ctrl.Parent.ID == "pnlSettings") ? @"^[0-9]*$" : (ctrl.ID == "txtUrl") ? @"http(s)?://([\w-]+\.)+[\w-]+(/[\w- ./?%&amp;=]*)?" : @"^[a-zA-Z0-9#$%&amp;@?""{}[]]*$" } ); } } //Add Validation Summary this.Form.Controls.Add(new ValidationSummary() { ShowMessageBox = true, ShowSummary = false }); </code></pre>
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    1. USKevin Howe
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    1. CO1) Have you debugged through to see if validators are getting added correctly? 2) Why do you need to dynamically add validators? Can't you just visible=true them when needed?
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      1. PODynamically Adding ASP.NET Validation Controls
      1. USMikeSmithDev
    2. CODuring which page event are you adding these? Also, you can drop the `ToList()` on the two `foreach` loops at the top.
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      1. PODynamically Adding ASP.NET Validation Controls
      1. USandleer
    3. COThe all the validators are being added correctly, during the page. I had to add the .ToList() because the VS was complaining the the source of the foreach was being modified between loops. I thought it would be easier todo this via code than to drop 20+ controls into the markup
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      1. PODynamically Adding ASP.NET Validation Controls
      1. USKevin Howe
 

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