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jquery cannot add date dynamically

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Release： 2023-05-11 17:41:07

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In recent years, with the continuous development of front-end technology, jQuery has become one of the most commonly used JavaScript libraries in web development. It provides a variety of simple and easy-to-use interfaces and functions, which greatly simplifies JavaScript coding work. However, in practical application, we will inevitably encounter some difficulties. This article will focus on one issue: how to dynamically add a date picker.

The date picker is one of the commonly used controls in web forms. In jQuery, there are also a variety of selector plug-ins for us to use. However, there are still some situations where we need to add a date picker dynamically, and in this case we need to write the code ourselves.

Suppose we need to add a date selection control to the page. How should we implement it? The following is a simple sample code:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>动态添加日期选择控件示例</title>
    <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
    <link rel="stylesheet" type="text/css" href="https://cdn.bootcdn.net/ajax/libs/jqueryui/1.12.1/jquery-ui.min.css">
    <script src="https://cdn.bootcdn.net/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js"></script>
</head>
<body>
    <h1>动态添加日期选择控件示例</h1>
    <div id="datepicker"></div>
    <button id="addDatepicker">添加日期选择控件</button>
    <script>
        $(document).ready(function() {
            $('#addDatepicker').click(function() {
                $('#datepicker').datepicker();
            });
        });
    </script>
</body>
</html>

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In the above code, we first introduced the related files of jQuery and jQuery UI. Then, we added a div element to the page and set its id to "datepicker". Next, a button element is added below the div element and its id is set to "addDatepicker".

In the last script tag, we use jQuery's .ready() method to determine that the page DOM is ready, and then add a click event to the button. In this event handler, we call the datepicker() method provided by jQuery UI to add a date picker to the Div element.

It seems that there should be no problem with the code, so why doesn’t the date picker appear? We found that although the above code can render the button when the page is rendered, the date picker does not appear after clicking.

After analysis, we found that the problem lies in the function of the button add event. More precisely, the problem lies with the datepicker() method. The reason for this problem is that jQuery's .load() method has been deprecated, and the datepicker() method depends on the .load() method. In other words, since the .load() method is no longer supported, the datepicker() method cannot work properly.

To solve this problem, we can use a more modern method to dynamically add a date picker. Specifically, we can use jQuery's .on() method to bind events as follows:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>动态添加日期选择控件示例</title>
    <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
    <link rel="stylesheet" type="text/css" href="https://cdn.bootcdn.net/ajax/libs/jqueryui/1.12.1/jquery-ui.min.css">
    <script src="https://cdn.bootcdn.net/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js"></script>
</head>
<body>
    <h1>动态添加日期选择控件示例</h1>
    <div id="datepicker"></div>
    <button id="addDatepicker">添加日期选择控件</button>
    <script>
        $(document).ready(function() {
            $('#addDatepicker').on('click', function() {
                $('<input>').appendTo('#datepicker').datepicker();
            });
        });
    </script>
</body>
</html>

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We need to add an Input box to the date picker control and then call the datepicker() method. This way works fine and adds the date picker dynamically.

In practical applications, we often encounter various problems such as position mismatch and format errors. In general, when using jQuery's date picker, we need to pay attention to the following points:

Introduce the required files appropriately. The relevant files of JQuery and jQuery UI need to be introduced.
Use the latest event binding method. The old method has been deprecated.
Follow the examples on the API and use the relevant methods correctly.
Pay attention to the date format. Different countries and regions have different time formats, so you need to pay attention.

In short, adding a date picker dynamically seems simple, but in fact it brings many problems. Only by carefully reading the API documentation, standardizing the code, and paying attention to time format and other issues can our code run normally.

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