What should I do if jquery cannot submit the form?

With the development of Internet technology, front-end technology is also constantly updated and upgraded. As an important part of front-end development, the jQuery library is widely used. In front-end development, form submission is a common operation, and jQuery is also commonly used when implementing form submission. However, sometimes we find that jQuery fails to submit the form successfully. Today we will explore these reasons and solutions.

Cause Analysis

1. The form is not bound to the submit event

In jQuery, if you want to submit a form, you must bind the submit event to the form, otherwise it will not be submitted. . This is due to jQuery's event mechanism. If the form is not bound to the submit event, the submit event cannot be triggered in jQuery. Therefore, we need to bind the submit event to the form.

// 表单绑定submit事件
$('form').submit(function () {
    // 提交表单的代码
    // ...
});

2. The type attribute of the form submission button is not submit

The button that submits the form must have an attribute of type submit, otherwise the form still cannot be submitted. This is because the browser will only submit data for buttons with submit type to the server as form data. Therefore, if the type attribute of the submit button is not submit, the form data will not be submitted.

// 表单提交按钮更改type为submit
<input type="submit" value="提交">

3. The form data is not cleared, resulting in repeated submissions

When using jQuery to submit a form, you need to pay attention to clearing the form data. Sometimes we will find that after submitting the form, if the form data is not cleared and submitted again, the submission will fail. This is because the form data has been submitted once, and repeated submissions will cause duplication of data, resulting in submission failure. Therefore, after submitting the form, the form data needs to be cleared.

// 清空表单数据
$('form')[0].reset();

Solution

1. Use the preventDefault method

The preventDefault method is a method in jQuery that prevents the browser's default behavior. When a form is submitted, if you use the preventDefault method, you can prevent the browser's default form submission behavior and use jQuery to submit the form.

// 表单提交
$('form').submit(function (event) {
    // 阻止默认的表单提交行为
    event.preventDefault();
    // 提交表单的代码
    // ...
});

2. Submit the form using Ajax

The Ajax method in jQuery can submit form data to the server asynchronously. In addition to data submission, we can also perform specific operations based on the data returned by the server. This method can submit the form without refreshing the page, and can effectively solve the problem of repeated submissions.

// 使用Ajax提交表单
$('form').submit(function () {
    $.ajax({
        url: 'submit.php',
        type: 'POST',
        cache: false,
        data: $(this).serialize(),
        success: function (response) {
            // 提交成功后的操作
            // ...
        },
        error: function () {
            // 提交失败后的操作
            // ...
        }
    });
    return false;
});

Summary

The above are the common problems and solutions we encounter when using jQuery for form submission. When using jQuery to submit a form, you need to bind the submit event to the form. The type attribute of the submit button must be submit. At the same time, you need to pay attention to clearing the form data and preventing repeated submission of the form. In addition, using the preventDefault method can prevent the default form submission behavior, and using Ajax to submit the form can achieve asynchronous submission, effectively solving the problem of repeated submissions. In actual development, we need to choose the most appropriate method for form submission for different scenarios.

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