How jquery.idcode.js gets the value of the verification code in the background

With the development of network technologies such as the Internet and e-commerce, verification codes have become an important part of network security. In order to prevent malicious machines or software from attacking and stealing user accounts, some websites or service platforms use verification code technology. jquery.idcode.js is a popular verification code plug-in that can provide simple and easy-to-use verification code functions for websites or service platforms. However, some users or developers may encounter a problem: How to get the value of the verification code in the background?

Below, this article will introduce the principle and usage of the jquery.idcode.js plug-in in detail, and analyze and explain how to obtain the value of the verification code in the background.

1. Principle of jquery.idcode.js plug-in

1.1 Basic introduction of the plug-in

jquery.idcode.js is a verification code plug-in based on the jQuery library. It can generate different types of verification codes, such as numbers, letters, Chinese characters, arithmetic expressions, etc. Using the jquery.idcode.js plug-in, you can provide users with the function of entering verification codes, effectively avoiding attacks on the website from non-human sources such as robots or scripts.

1.2 Working principle of the plug-in

The working principle of the jquery.idcode.js plug-in is relatively simple. When the user loads the page, the plug-in automatically generates a random verification code and stores the verification code information in a cookie or sessionStorage. When the user submits the form data, the server will compare the verification code value entered by the user with the value stored in the cookie or sessionStorage. If they match, it means that the user input is correct.

2. How to use the jquery.idcode.js plug-in

In order to use the jquery.idcode.js plug-in, you need to introduce relevant files and libraries into the page first. The specific operation method is as follows:

2.1 Introduce the jQuery library file

Introduce the jQuery library file into the page and ensure that it can be loaded normally:

<script src="jquery.min.js"></script>

2.2 Introduce jquery.idcode. js file

Introduce the jquery.idcode.js plug-in file into the page:

<script src="jquery.idcode.min.js"></script>

2.3 Create a verification code element

Create an element in the page to display the verification code . This element can be a span tag or an input tag. The specific choice needs to be based on the actual situation.

<span id="idcode"></span>

2.4 Initialize the verification code plug-in

After the page is loaded, call the initialization method provided by the jquery.idcode.js plug-in to generate the verification code.

$(document).ready(function(){
    $('#idcode').attr('value','');
    var code=$.idcode({
        //配置生成验证码的属性
    });
});

2.5 Get the verification code entered by the user

When the user submits the form data, the verification code value entered by the user can be obtained through the following code:

var inputCode = $("#inputCode").val();

3. How to do it in the background Get the value of the verification code

The above is the basic usage of the jquery.idcode.js plug-in. Next, we will introduce how to obtain the value of the verification code in the background. Under normal circumstances, to obtain the value of the verification code in the background, the value of the verification code needs to be submitted to the background for comparison and verification. There are two common methods: obtaining through cookie or sessionStorage and obtaining through form submission.

3.1 Obtain through cookie or sessionStorage

The jquery.idcode.js plug-in saves the verification code information in cookie or sessionStorage by default. Therefore, we can get the value of the verification code by reading the cookie or sessionStorage.

//获取cookie中验证码值
var code = $.cookie("idcode");
//获取sessionStorage中验证码值
var code = sessionStorage.getItem("idcode");

3.2 Obtain through form submission

When the user submits the form data, the value of the verification code can be submitted to the background for verification through the form data.

$.ajax({
    type : "POST",
    url : "checkCode.php",//后台处理验证码的php脚本
    data : {
        idcode : inputCode //inputCode为用户输入的验证码值
    },
    dataType : "json",
    success : function(result){
        if(result.success == "true"){
            //如果验证码输入正确，则执行相应的操作
        } else {
            //如果验证码输入不正确，则提示用户重新输入
        }
    }
});

The above is the basic introduction to the jquery.idcode.js plug-in, its usage and the implementation method of obtaining the value of the verification code in the background. Hope this article can help you.

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