ASP.NET CodeBehind Fails to Recognize Changes in TinyMCE Textarea

I have multiple

<asp:TextBox TextMode="MultiLine">
elements on a webpage. Initially, I populate them using VB code behind and then convert them into TinyMCE editors with the help of the jQuery TinyMCE plugin. Each text box has an associated button for submitting the text back to the code behind for insertion into a database.

Upon clicking the submit button, I realized that I needed to "save" the editor's contents to the text box before proceeding further. However, even after completing this step, the edits were not being reflected in the code behind.

My approach involves utilizing jQuery. Below is the click handler implementation as all buttons are considered submit buttons in ASP.NET due to the submit class:

$('input.submit').live('click', function() {
    tinyMCE.EditorManager.triggerSave();
});

Hence, whenever any submit button is clicked, the save event is triggered for all TinyMCE editors. Upon execution, I verified the edited content by checking the textarea value using JavaScript:

console.log($(this).parent().find('textarea').val());

However, despite seeing the edits through console.log in Chrome Developer tools, none of the changes were visible in the server-side click handler for the submit button:

Dim paragraph As String = Me.myTextArea.Text
' This retrieves the original text, not the edited version

Additional Information:

  • Each editor resides within its own update panel
  • Due to the HTML content being submitted, I had to disable EnableEventValidation="false" and ValidateRequest="false" (based on advice from a senior developer in our team)
  • While I'm relatively new to .NET, this inconsistent behavior appears perplexing to me. There might be a crucial aspect that I am overlooking.

Answer №1

After some investigation, I finally cracked the code.

As it turns out, my initial hunch from the comment I left on the original question was spot on. The issue stemmed from the ASP.NET async postback triggering first, sending the outdated text to the server. Following that, my onclick event fired, updating the textarea with the new text and hitting my breakpoint (confirming that the update was successful). Subsequently, the server processed the old text, reaching the VB breakpoint.

It appears that when dealing with asynchronous operations in ASP.NET, priority is given to ASP.NET clicks over any custom click handlers attached via JavaScript. Essentially, the order of execution follows a "first-come-first-served" approach, with ASP.NET taking precedence.

In my scenario, the remedy involved altering the way content was saved within the TinyMCE editor. Instead of relying on button clicks, I modified the saving process to occur whenever there was a change:

$(this).tinymce({
    script_url : '../scripts/tiny_mce.js',
    theme: 'advanced',
    plugins: 'save',
    theme_advanced_buttons1 : 'bold,italic,underline,|,justifyleft,justifycenter,justifyright,justifyfull,|,image,link,unlink,|,fontsizeselect,forecolorpicker',
    theme_advanced_buttons2 : '',
    theme_advanced_buttons3 : '',
    content_css : '../css/landingpage-tinymce.css',
    onchange_callback: function(ed) {
        ed.save();
    }
});

Take note of the onchange_callback parameter, responsible for saving the editor's contents to the textarea. This setup ensures that content is saved every time an "undo level" is added, triggered by user input or other events like cursor movements or blurring of the editor.

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