The button fails after the FastAdmin key-value component dynamically renders. How to solve it?

Detailed explanation and solution for the problem of dynamic rendering of FastAdmin key-value component (fieldlist) causing button failure

When using the fieldlist of FastAdmin, if the new button cannot respond to the click event after dynamically rendering the component content through JavaScript, it is usually caused by an event binding error. This article will analyze this problem in depth and provide effective solutions, especially for the failure of the solutions provided in the FastAdmin documentation.

The root cause of the problem is that the dynamically added elements do not exist when the page is initially loaded, so the event listener bound to the page is unable to capture the click events of these elements.

Solution: Use event delegation mechanism. The event delegate binds the event listener to the parent element. When the event bubbles to the parent element, it then determines whether the event target element meets the conditions, thereby triggering the corresponding event handling function.

The following example code uses jQuery to implement event delegate to solve the problem of button failure after dynamic rendering of FastAdmin key-value component (fieldlist):

<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Button Append Example</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">

ID	Chinese name	English name	Number of pieces	Volume	Gross Weight	Value (USD)	Operate
Append

$(document).ready(function() {
    $(document).on('click', '.btn-append', function(event) {
        event.preventDefault();
        // Add new element logic let newRow = `<tr>
                        <td>New ID</td>
                        <td>New Chinese name</td>
                        <td>New English name</td>
                        <td>New Number of pieces</td>
                        <td>New Volume</td>
                        <td>New Gross Weight</td>
                        <td>New Value (USD)</td>
                        <td><a href="https://www.php.cn/link/b025cd6cde5038544af3b6bea29a7a5e" class="btn btn-sm btn-danger btn-remove"><i class="fa fa-times"></i> Remove</a></td>
                      </tr>`;
        $('table.fieldlist').append(newRow);
    });

    // Binding event $(document).on('click', '.btn-remove', function(event) {
        event.preventDefault();
        $(this).closest('tr').remove();
    });
});

This code binds the event listener to document object through $(document).on('click', ...) to ensure that the dynamically added click events of .btn-append and .btn-remove elements can be correctly captured and processed. This effectively solves the problem of button failure after dynamic rendering. Note that the code uses a cleaner template string to create new lines.

Even elements added dynamically can ensure that their events can be handled correctly through event delegating, thus solving the problem of button failure after dynamic rendering of FastAdmin key-value components.

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