How to write front-end interface in jquery

Writing the front-end interface is an important part of modern Web development. You can use JQuery to simplify this process and improve the readability and maintainability of the code. This article will introduce in detail how to use JQuery to write front-end interfaces, as well as code examples.

1. The role of JQuery

JQuery is a convenient and fast JavaScript library that can help us complete some common web response operations more easily. Through JQuery, we can easily interact with the HTML DOM, manipulate CSS styles, perform animations, assign handlers to events, send AJAX requests, etc.

2. What is the front-end interface

The front-end interface is also called API (Application Programming Interface), which refers to the interface used by a web application to interact with another application or server. A front-end interface is usually a set of protocols that defines functions, protocols, and tools for passing data and control information between the front-end and back-end.

3. Use JQuery to write the front-end interface

Before using JQuery to write the front-end interface, you need to first choose a suitable server-side web framework, such as ASP.NET, PHP, Ruby on Rails, etc. Here we take ASP.NET MVC as an example to demonstrate how to use JQuery to write a front-end interface.

First, you need to create a controller in ASP.NET MVC and write a method in this controller that returns data in JSON format. The following is a simple ASP.NET MVC controller method that returns an array, serialized to JSON format:

public ActionResult GetUsers()
{
    string[] users = new string[] { "John", "Mary", "Peter" };
    return Content(JsonConvert.SerializeObject(users), "application/json");
}

Next, let’s write the client code. Add a button and a div element to display the results to the HTML page:

<button id="get-users">Get users</button>
<div id="result"></div>

Then, use JQuery's ajax method to send an HTTP GET request, and then handle the JSON response in the success callback function.

$(document).ready(function () {
    $("#get-users").click(function () {
        $.ajax({
            url: "/User/GetUsers/",
            dataType: "json",
            type: "GET",
            success: function (users) {
                var list = "<ul>";
                $.each(users, function (index, user) {
                    list += "<li>" + user + "</li>";
                });
                list += "</ul>";
                $("#result").html(list);
            },
            error: function (xhr, errorText, errorThrown) {
                alert("Error: " + xhr.statusText + "
" + errorText);
            }
        });
    });
});

Code explanation:

• $(document).ready function is used to ensure that HTML elements have been loaded into the page. The
• $("#get-users") function obtains the button element with the id of get-users and adds a handler function to its click event.
• $.ajax function sends an HTTP GET request, specifies the data type as JSON format, and processes the returned user information in the success callback function. The
• $.each function is used to iterate over the returned JSON data, apply the given function to at least each element, and append the results to the existing list.
• Finally, use $("#result").html(list) to add the list to the div element in the HTML page.

4. Summary

Using JQuery to write the front-end interface allows us to interact with the back-end server more easily to transfer data and control information. JQuery's concise syntax, encapsulated functionality, and good compatibility have made it a popular web development tool, providing developers with a fast and elegant way to complete these tasks.

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