How to prevent users from entering content in the input box in jquery

In web development, sometimes it is necessary to limit the user's input content in the input box. At this time, some jQuery methods must be used to operate the input box. This article mainly introduces how to use jQuery to prevent users from entering content in the input box.

1. The default function of prohibiting the input box

Before prohibiting input in the input box through jQuery, we need to first understand the type attribute of the input tag. The type attribute value of the input tag mainly includes the following:

1. text：Text box
2. password：Password box
3. radio：Radio box
4. checkbox：Check box
5. submit: submit button
6. reset: reset button
7. file: file upload
8. hidden: hidden field
9. date: date picker
10. number: Number input box
11. email: Email input box
12. tel: Phone number input box
13. search: Search input box

The following is the code that uses jQuery to disable the default function of the input box:

$(document).ready(function() {
  // 禁止文本框和密码框的默认功能
  $('input[type="text"],input[type="password"]').bind('keypress', function(event) {
    if (event.keyCode == 13) {
      event.preventDefault();
    }
  });
});

In the above code, we first use jQuery's .ready() method to wait for the page to load, and then bind the .keypress event To prevent the default carriage return submission function of the input box. Among them, event.keyCode represents the pressed keyboard key code, and 13 represents the keyCode of the Enter key.

2. Disable input in the input box

Sometimes, we need to prohibit users from entering text in the input box. The following is the code to use jQuery to prohibit input in the input box:

$(document).ready(function() {
  // 禁止文本框和密码框输入
  $('input[type="text"],input[type="password"]').bind('input propertychange', function(event) {
    this.value = this.value.replace(/[^\u0000-\u00ff]/g, ''); // 只允许输入英文、数字和中文等ASCII字符
  });
});

In the above code, we listen for content changes in the input box by binding .input and .propertychange events. In the event processing function, we called the replace() method of the String object to filter out non-ASCII characters through the regular expression /¹/g to achieve the effect of prohibiting input. .

3. Disable input boxes

Sometimes, we need to disable all input boxes. The following is the code to use jQuery to disable the input boxes:

$(document).ready(function() {
  // 禁用所有输入框
  $('input').attr('disabled', 'disabled');
});

In the above code, We use jQuery to select all input tags and set a "disabled" attribute on them through the .attr() method, thus disabling all input boxes.

4. Disable a single input box

Sometimes, we only need to disable a single input box. The following is the code to use jQuery to disable a single input box:

$(document).ready(function() {
  // 禁用文本框和密码框输入
  $('#input-id').attr('disabled', 'disabled');
});

In the above code , we obtain the specified input boxes through the selector "#" id, and set a "disabled" attribute for them through the .attr() method, thus disabling the specified input boxes.

Summary:

This article mainly introduces some methods of using jQuery to disable input box input, including disabling the default function of the input box, disabling input box input, disabling all input boxes and disabling a single input box . I hope it will be helpful to you in your actual work of web development.

The above is the detailed content of How to prevent users from entering content in the input box in jquery. For more information, please follow other related articles on the PHP Chinese website!