如果JSON数据中存在数据，请输入onchange检查器 [英] Input onchange checker if data exist in JSON data

问题描述

添加表单时，我有一个用户要求，应该检查表单名称是否已经存在.如何在es6中做到这一点?我正在使用AntDesign和ReactJS.

I have a user requirement when adding a form it should check if the name of the form is already exist. How can I do that in es6? I'm using AntDesign and ReactJS.

这是我的代码

<Form.Item label="Form Name">
  {getFieldDecorator('formName', {
   rules: [formConfig],
  })(<Input name="formName" onChange={onChange} />)}
</Form.Item>

const handleChange = e => {
  const { name, value } = e.target;

   setState(() => ({
     ...state,
     [name]: value,
   }));

   let isExist = [...formDataSource];
    let foundExistItem = isExist.filter(
      item => item.formName === formName
    );
 };

推荐答案

如果要动态查询表单字段，则应使用

If you want dynamically query the form fields, you should wrap your form with Form.create.

它注入有用的功能，例如onFieldsChange侦听器:

It injects useful functionalities like onFieldsChange listener:

const onFieldsChange = (_, changedFiels) => {
  const { username } = changedFiels;
  if (username) {
    // Make your API checks
    console.log(`Now changing ${username.name}`);
  }
};

const ValidatedFields = Form.create({ onFieldsChange })(App);

注意:您应该使用如果您仍然坚持要控制表单项，则应使用 getFieldValue :

If you still insist to make form items controlled, you should use getFieldValue:

const handleChange = e => {
  const { name, value } = e.target;
  const { getFieldValue } = form;

  setState(() => ({
    ...state,
    [name]: value
  }));

  // or use getFieldValue for a single query
  const values = getFieldsValue(['formName',...more fields]);

  if (values.length) {
    // API CALL
  }
};

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