在用户键入时加载带有异步选项的react-select动态下拉菜单 [英] react-select dynamic dropdown with async options loaded as user is typing

问题描述

我是React的新手，我正在尝试合并2个不同的功能.一种动态表单，您可以在其中添加和/或删除输入，以及一个具有异步react-select的表单，您可以在其中开始输入单词，然后根据API来源(例如，基于连接的用户)显示选项并进行过滤

I'm new to React and I'm trying to merge 2 different features. A dynamic form where you can add and/or remove inputs AND one with async react-select where you can start typing a word and options appear and get filtered based on an API source (based on connected user for example)

(我想)我快完成了:

当我开始键入内容时，我可以正确看到我的选项...并且在单击某个项目(以选择该项目)时，选项被正确过滤，但出现错误.

When I start typing I correctly see my options...and options get filtered correctly BUT when I click on an item (to select this item) I get an error.

我得到的错误是无法读取未定义的属性'name'，但我不理解，我不确定这是我遇到的唯一问题.我不知道如何正确选择并正确放入对象数组( inputFields )

The error I got is Cannot read property 'name' of undefined but I don't understand it and I'm not sure it's the only problem I got. I have no clue how to get my choice to cprrectly get selected and correctly put into my array of objects (inputFields)

以下是我尝试混合使用的2种不同来源(它们都可以完美地独立运行)

Here are the 2 different sources I try to mix (They both work perfectly put independantly)

React-Select Async下拉列表: https://stackblitz.com/edit/react-select-async-component?file = index.js 动态表单字段: https://www.youtube.com/watch?v=zgKH12s_95A

React-Select Async dropdown : https://stackblitz.com/edit/react-select-async-component?file=index.js Dynamic form field : https://www.youtube.com/watch?v=zgKH12s_95A

谢谢您帮助我理解问题所在！！

Thank you for helping me understand what's the problem !!!

这是我的代码:

function AsyncDynamicForm(props) {
  const [inputFields, setInputFields] = useState([
    { firstName: '' },
  ]);
  const [inputValue, setValue] = useState("");


  const handleChangeInput = (index, event) => {
    const values = [...inputFields];
    values[index][event.target.name] = event.target.value;
    setInputFields(values);
  };

  const AddFields = () => {
    setInputFields([...inputFields, { firstName: '' }]);
  };

  const RemoveFields = (index) => {
    const values = [...inputFields];
    values.splice(index, 1);
    setInputFields(values);
  };


  const loadOptions = (inputValue) => {
    return fetch(
      `http://127.0.0.1:8000/api/Objects/?q=${inputValue}`
    ).then((res) => res.json());
  };
    

  const handleInputChange = (value) => {
    setValue(value)
  };
  
  const handleSubmit = (e) => {
    e.preventDefault();
    console.log("inputFields", inputFields); // Nothing for now
  };


  return (
    <div>
        <Container>
          <Form onSubmit={handleSubmit}>
            {inputFields.map((inputField, index) => (
              <div key={index}>
                <Form.Field inline>
                  <AsyncSelect
                    name="firstName"
                    value={inputField.firstName}
                    onChange={(event) => handleChangeInput(index, event)}
                    cacheOptions
                    defaultOptions
                    getOptionLabel={(e) => e.name.toString()}
                    getOptionValue={(e) => e.id}
                    loadOptions={loadOptions}
                    onInputChange={handleInputChange}
                  />
                </Form.Field>
                <Button.Group basic size="small">
                  <Button icon="add" onClick={() => AddFields()} />
                  <Button
                    icon="x"
                    onClick={() => RemoveFields(index)}
                  />
                </Button.Group>
              </div>
            ))}
          
            <Button type="submit" onClick={handleSubmit}>
              click
            </Button>
          </Form>
        </Container>
    </div>
  );
}

export default AsyncDynamicForm

推荐答案

文档非常有用这里. onChange 道具采用带有特定签名的方法.

The documentation is very helpful here. The onChange prop takes a method with a specific signature.

const onChange = (option, {action}) => {
  /* The `option` value will be different, based on the Select type
   * and the action, being one of `option`, an array of `option`s
   * (in the instance of a multiselect), `null` (typical when clearing
   * an option), or `undefined`.
   * What you actually get will depend on the `action` the select passes,
   * being one of:
   * - 'select-option'
   * - 'deselect-option'
   * - 'remove-value'
   * - 'pop-value'
   * - 'set-value'
   * - 'clear'
   * - 'create-option'
   */
   // example uses the `useState` hook defined earlier
   switch (action) {
     case 'select-option',
     case 'remove-value',
     case 'clear':
       setColor(option);
       break;
     default:
       // I'm not worried about other actions right now
       break;
   }
};

请记住，React-Select将 value 视为整个 option 对象，而不仅仅是在 getOptionValue <中定义的 option 值./code>.如果您要设置一个真正的表单值"，则可能会以某种方式包装选择"来处理该问题.

Remember that React-Select treats value as the entire option object, not just the option value you define in getOptionValue. If you're looking at setting a true form 'value', you'll probably wrap Select in some way to handle that.

React-Select非常强大，而且非常复杂.该文档是您的朋友.当尝试尚未完全了解的功能时，我发现在CodeSandbox中玩耍很有帮助.

React-Select is incredibly powerful, and incredibly complex. The documentation is your friend here. I find it helpful to play around in CodeSandbox, when trying out features I don't fully understand yet.

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