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Content Selection with mx-select

The mx-select attribute in Trongate MX is a powerful feature that allows you to extract and use specific parts of a server response, rather than the entire response. This capability is particularly useful when dealing with large HTML documents where only a portion of the content is needed.

Understanding mx-select

When you use mx-select, you're telling Trongate MX to look inside the server's response and pick out only the parts you've specified. This is done using CSS selector syntax, allowing for precise targeting of elements within the response.

When to Use mx-select

The 'mx-select' attribute is particularly useful in scenarios where:

  • You're fetching data from an endpoint that returns an entire HTML page, but you only need a specific section.
  • You want to update part of your page without affecting the rest of the layout.
  • You're working with legacy systems or APIs that return full pages instead of focused data.

Example Scenario

Let's consider a practical example to illustrate the use of mx-select:

Imagine you have an API endpoint that returns a full HTML page containing various elements, including a table with important data. You want to update only a specific part of your current page with this table, without affecting the rest of your layout.

<button mx-get="<?= BASE_URL ?>api/full_page_data" 
    Fetch Important Data

<div id="data-container">

Breaking Down the Example

  • The button triggers a GET request to 'api/full_page_data', which returns a complete HTML page.
  • mx-select="table.important-data" instructs Trongate MX to extract only the table with the class 'important-data' from the response.
  • The selected table is then inserted into the #data-container div.

Benefits of Using mx-select

This approach offers several advantages:

  • Reusability: You can reuse existing server-side rendering logic that generates full pages.
  • Performance: By minimizing the amount of data inserted into the DOM, you can improve page performance.
  • Clean Markup: Your client-side markup remains clean and focused on the required data.
  • Flexibility: You can easily change what part of the response you want without modifying server-side code.

Advanced Usage

The mx-select attribute is not limited to simple selectors. You can use complex CSS selectors to pinpoint exactly what you need:

<button mx-get="<?= BASE_URL ?>api/complex_data" 
        mx-select="#main-content > div.data-section:nth-child(2) table">
    Fetch Specific Table

This example selects a table that is the second child of a div with class 'data-section', which is inside an element with id 'main-content'.

Note: The mx-select attribute uses CSS selector syntax. You can use any valid CSS selector to pinpoint the exact element you need from the response. This includes IDs, classes, attributes, and even pseudo-selectors.

Best Practices

  • Use specific and unique selectors to ensure you're getting exactly what you need.
  • Consider the structure of your server responses when designing your selectors.
  • Test your selectors thoroughly, especially when working with dynamic content.
  • Use mx-select in combination with other Trongate MX attributes for more complex operations.


The mx-select attribute in Trongate MX provides a powerful way to extract specific content from server responses. By allowing precise selection of elements, it enables developers to create more efficient, flexible, and maintainable web applications. Whether you're working with legacy systems, complex APIs, or just aiming for cleaner code, mx-select is a valuable tool in your Trongate MX toolkit.