How to refresh data in jquery

With the development of network applications, data display is a very important part of front-end development. In the process of data display, we often need to refresh the page or refresh part of the data to keep it up to date. JQuery is a very popular Javascript library that provides many convenient methods to deal with front-end issues. So, how to refresh data in JQuery?

JQuery provides some APIs to refresh data, and we can implement different refresh mechanisms through these APIs.

1. Use Location.reload() to refresh the entire page

The Location object represents the URL of the current page. Through this object, we can obtain the URL, hash, protocol, hostname and other information of the page. reload() is a method of the Location object, which can reload the current page.

So, if we need to refresh the entire page, we can call this method directly:

$(document).ready(function(){
    $("#refresh_button").click(function(){
        location.reload();//通过location对象的reload方法来刷新页面
    });
});

Code explanation:

First, we initialize a click after the DOM is loaded. The event is on the button with id "refresh_button". When the user clicks the button, the reload() method of the location object will be called, which will reload the current page.

2. Use Ajax to refresh part of the data

If we only need to refresh part of the data in the page, rather than the entire page, then we can use the Ajax technology in JQuery.

The full name of Ajax is "Asynchronous JavaScript and XML", which is a technology used to create fast dynamic web pages. Through Ajax, we can send a request to the server, obtain data, and update part of the page without refreshing the page.

In JQuery, Ajax is implemented through the $.ajax() method. This method accepts an object as a parameter, which defines the request type, request URL, request parameters, request response and other information. Here we only need to pay attention to the data attribute and success attribute.

The data attribute specifies the request parameters to be sent to the server, and the success attribute specifies the callback function to be executed when the request is successful.

With these, we can first add an element that displays data to the page, such as a div tag. Then, when the user clicks the refresh button, we send a request to the server through ajax, obtain the data, and insert the data into the div tag to achieve the effect of refreshing the data.

The core code is as follows:

$(document).ready(function(){
    //初始化页面
    function load_data(){
        $.ajax({
            url:"data.php",
            type:"POST",
            success:function(data){
                $("#data_container").html(data);//将获取到的数据插入到id为"data_container"的div标签中
            }
        });
    }
    //第一次加载数据
    load_data();
    //点击刷新按钮时，重新加载数据
    $("#refresh_button").click(function(){
        load_data();
    });
});

Code explanation:

First, we define a function load_data, in which a request is sent to the server through $.ajax(), Get the data and insert the data into the div tag with the id "data_container". By calling this function, we can load data when the page initializes, or reload data when the user clicks the refresh button.

When the page is initialized, we call the load_data() method to obtain the data and insert the data into the div tag. When the user clicks the refresh button, we call the load_data() method again to refresh the data.

Summary:

JQuery is a very powerful and popular front-end development library. It provides many convenient methods to deal with front-end problems. Refreshing data is an essential function in front-end development, and in JQuery, we can achieve data refresh through Location.reload() and Ajax technology. Whether it is refreshing the entire page or refreshing part of the data, it can be easily achieved through these methods.

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