What should I do if I cannot receive data when submitting a form in thinkphp?

When using the ThinkPHP framework for form submission, sometimes we encounter situations where we cannot receive form data. This situation will definitely cause confusion and headaches, especially when our application needs to obtain form data for further processing. So why does this happen? How do we solve this problem? Next, this article will answer them one by one for you.

1. Cause

The most common situation is that when the form is submitted, the form is not verified, resulting in the program being unable to obtain the form data. At this point, we need to perform some simple validation operations on the form to ensure that the data in the form can be submitted to the server correctly.

In addition, there are the following situations:

(1) The variable name in the form is inconsistent with the variable name in the action controller, resulting in the inability to obtain data;

(2) The method attribute of the form is incorrect, resulting in the inability to obtain the form data;

(3) If there is a file upload in the form, you need to use $file = request()->file('file '); to get the uploaded file.

2. Solution

(1)Verify the form

Before submitting the form, we need to verify the form to determine whether the variables in the form are null. If the variable is not empty, store the variable value into the array, otherwise ignore the variable. Finally, pass the array as a parameter to the method that processes the form.

The sample code is as follows:

public function dealForm(Request $request){
    $data = array();
    $data['var1'] = $request->param('var1');
    $data['var2'] = $request->param('var2');
    $data['var3'] = $request->param('var3');
    $result = $this->validate($data, [
        'var1|变量名1' => 'require',
        'var2|变量名2' => 'require',
        'var3|变量名3' => 'require'
    ]);
    if (true !== $result) {
        $this->error($result);
    }
    //处理表单数据

}

(2) Check the variable name and method attribute

Before submitting the form, we need to check the variable name in the form and the variable in the action controller Whether the names are consistent and whether the method attribute of the form is correct. Only when the variable name in the form is consistent with the variable name in the action controller, and the method attribute is set correctly, can the form data be successfully obtained.

(3) File upload

If there is a file upload in the form, we need to store the uploaded file in the specified folder and save the file path to the database. Code example:

$file = request()->file('file');
if ($file) {
    $info = $file->move(ROOT_PATH . 'public' . DS . 'uploads');
    if ($info) {
        $data['file'] = '/uploads/' . $info->getSaveName();
    } else {
        $this->error($file->getError());
    }
}

3. Summary

With the above method, we can easily solve the problem of being unable to obtain form data. It is important to note that before submitting the form, we need to verify the form to ensure that the data in the form can be correctly submitted to the server. In actual projects, we can also use Ajax technology to implement form submission and verification, thereby improving user experience and website performance.

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