What are HTML hidden fields? What are the advantages?-Front-end Q&A-php.cn

What are HTML hidden fields? What are the advantages?

PHPz

Release： 2023-04-21 15:03:16

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With the continuous development of the Internet, websites are becoming more and more interactive and need to constantly interact with the server. In this process, the front-end page and the back-end service need to transfer data to each other. In this case, we need to use hidden fields.

What is HTML hidden field?

HTML hidden field is an invisible form element. Its main function is to save data so that the data can be transferred on different pages without interfering with user input. In this way, some data can be passed between the client and the server to achieve data interaction between the front and back ends.

Use of hidden fields

The use of hidden fields is very simple, just set type="hidden" in the HTML form. As shown in the following code:

<html>
<body>
  <form action="#" method="post">
    <input type="hidden" name="username" value="John">
    <input type="hidden" name="age" value="30">
    <input type="submit" value="Submit">
  </form>
</body>
</html>

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In this example, we created a form with two elements. The type attribute of these two elements is set to "hidden", and the values of username and age are saved respectively. When the user clicks the submit button, the data will be automatically submitted to the server.

Advantages of hidden fields

There are many advantages to using hidden fields:

Convenient to pass data: Compared with the url delivery method, using hidden fields can pass more The data.
Higher security: Because the hidden domain is set on the server side and cannot be viewed on the client side, the security of the data can be protected.
Convenient to process data: Use hidden fields to submit data on the page directly to the server to facilitate background data processing.
Good browser compatibility: HTML’s hidden domain function is supported in most browsers.

Things to note

When using HTML hidden fields, you need to pay attention to the following aspects:

Security of hidden fields: Although in the customer The value of the hidden field cannot be seen by the browser, but it can still be obtained through some technical means on the browser side. Therefore, the hidden field cannot guarantee 100% data security.
Naming of hidden fields: In order to prevent naming conflicts, each hidden field must have a unique name attribute value.
The value of the hidden field: The value of the hidden field must be of string type. If you need to pass complex data types, you need to use other formats such as json.
Handling multiple hidden fields: You need to pay attention to the situation of handling multiple hidden fields. At this time, you can use the serialization form to obtain the values of all hidden fields and process them uniformly.

Summary

HTML hidden fields are an indispensable part of web development. It can easily transfer data between the front end and the back end, improving website optimization and user experience. Help was provided. In practical applications, you need to pay attention to many aspects such as the security, naming, and value type of hidden fields.

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