How to refresh div with jquery-Front-end Q&A-php.cn

How to refresh div with jquery

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Release： 2023-05-28 10:28:07

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In front-end development, it is often necessary to dynamically update the content of web pages, and JQuery is a very popular JavaScript library. It provides many tool functions to facilitate us to update elements on the page. Among them, refreshing div is a relatively common requirement. Let's take a look at how JQuery refreshes div.

First of all, we need to clarify what refresh div is. Generally, div refresh is used when the content of a certain div area needs to be updated after the asynchronous request returns data, without refreshing the entire page. This method of refreshing only part of the content without refreshing the entire page can make the front-end flow smoothly and the user experience smoother.

Next, we need to understand the basic usage of JQuery. The first thing that should be clear is that JQuery is a JavaScript library, so we need to introduce JQuery's js file. Normally, we will put the following code in the header of the HTML file:

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title>页面标题</title>
    <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
  </head>
  <body>
    <!-- 页面内容 -->
  </body>
</html>

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After introducing JQuery, let's look at how to use JQuery to update the content in the div. Generally speaking, updating the content of a div is divided into two steps: the first step is to obtain the div element that needs to be updated through JQuery, and the second step is to update the content of the div through the API provided by JQuery.

The method to get the div element is very simple. You only need to use JQuery's selector to get the div element that needs to be updated. For example:

var divElement = $('div#updateDiv');

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Here we use the div element with the id of updateDiv. selector to get it and assign it to the variable divElement.

Next, we need to use the API provided by JQuery to update the content in this div. JQuery provides a variety of API methods for updating the content of elements, the commonly used methods are html() and text().

Update the content of the div through the html() method

The html() method can set or return the content of the selected element. More specifically, it can be used to insert HTML code into the specified inside a div element.

For example, we use the following code to get data by calling Ajax:

$.ajax({
  url: 'https://jsonplaceholder.typicode.com/todos/1',
  type: 'GET',
  dataType: 'json',
  success: function(data) {
    $('div#updateDiv').html('任务名称：' + data.title + '<br>' + '任务状态：' + data.completed);
  }
});

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Here, we get the data by calling Ajax, and splice the values of the title and completed attributes of the data into the task name and task status string, and then call the html() method to update this string into the div element.

Update the content of the div through the text() method

The text() method can set or return the text content of the selected element, which can be used to update the text content of the specified div element.

For example, we use the following code to get data by calling Ajax:

$.ajax({
  url: 'https://jsonplaceholder.typicode.com/todos/1',
  type: 'GET',
  dataType: 'json',
  success: function(data) {
    $('div#updateDiv').text('任务名称：' + data.title + '，' + '任务状态：' + data.completed);
  }
});

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Here, we also get the data by calling Ajax, and splice the values of the title and completed attributes of the data into A string of task name and task status, and then calls the text() method to update this string to the div element.

Through the above method, we can easily update the div content on the front end. But it should be noted that this update method is only applicable when the content in the div is not a complex HTML structure. If the updated content is more complex, we can use front-end frameworks such as Vue.js to achieve a better development experience.

Summary:

JQuery is one of the commonly used JavaScript libraries in front-end development. By using JQuery’s API, you can easily operate page elements. When implementing div refresh, by first obtaining the div element that needs to be updated, and then using the API methods provided by JQuery, such as html() and text() methods, to update the content in the div, you can refresh the entire page without refreshing the entire page. Partial content effects.

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