reactjs - 在 ReactJS 中使用 optgroup 选择

Question

我现在有以下数据:

[
    {
        "value": "G1-1",
        "text": "One",
        "optgroup": "Group 1
    },
    {
        "value": "G1-2",
        "text": "Two",
        "optgroup": "Group 1"
    },
    {
        "value": "G1-3",
        "text": "Three",
        "optgroup": "Group 1"
    },
    {
        "value": "G1-4",
        "text": "Four",
        "optgroup": "Group 1"
    },
    {
        "value": "G2-1",
        "text": "One",
        "optgroup": "Group 2"
    },
    {
        "value": "G2-2",
        "text": "Two",
        "optgroup": "Group 2"
    },
    {
        "value": "G2-3",
        "text": "Three",
        "optgroup": "Group 3"
    },
    {
        "value": "G2-4",
        "text": "Four",
        "optgroup": "Group 4"
    }
]

我将这些数据作为选项传递到我创建的简单 Dropdown 组件中，如下所示:

const SelectInputRound = ({defaultOption, name, value, onChange, options}) => {
    return (
        <select
            id={name}
            className="inputSelectRound form-control override-fc"
            name={name}
            value={value}
            onChange={onChange}>
            <option className="defaultOption" value="">{defaultOption}</option>
            {
                options.map((option) => {
                    return <option key={option.value} value={option.value}>{option.text}</option>;
                })
            }
        </select>
    );
};

我现在的问题是我不确定如何对我的选项进行分组并将其传递给我的控件，以便我可以在我的组件中显示 optgroups。

Answer 1

My problem now is I'm not sure how to group my options and pass it to my control such that I can have optgroups show up in my component.

在将数据传递给您的 Dropdown 之前组件，您可以先对其进行转换以相应地对数据进行分组。例如，像这样。

const options = [
  {
    value: "G1-1",
    text: "One",
    optgroup: "Group 1"
  },
  {
    value: "G2-2",
    text: "Two",
    optgroup: "Group 2"
  },
  {
    value: "G2-3",
    text: "Three",
    optgroup: "Group 3"
  },
  {
    value: "G2-4",
    text: "Four",
    optgroup: "Group 4"
  }
];
const groupedOptions = {};
options.forEach(option => {
  if (!groupedOptions[option.optgroup]) groupedOptions[option.optgroup] = [];
  groupedOptions[option.optgroup].push({
    value: option.value,
    text: option.text
  });
});
console.log(groupedOptions);

但是你必须修改你的 Dropdown组件也是如此，而不是期待 options作为 props 之一，它应该期待一组选项。

const renderOptions = options => {
  return options.map(option => {
    return (
      <option key={option.value} value={option.value}>
        {option.text}
      </option>
    );
  });
};

const SelectInputRound = ({
  defaultOption,
  name,
  value,
  onChange,
  groupedOptions
}) => {
  return (
    <select
      id={name}
      className="inputSelectRound form-control override-fc"
      name={name}
      value={value}
      onChange={onChange}
    >
      {Object.keys(groupedOptions).map((group, index) => {
        return (
          <optgroup key={index} label={group}>
            {renderOptions(groupedOptions[group])}
          </optgroup>
        );
      })}
    </select>
  );
};

参见工作示例 here.