React Material Multi Select 默认值未选中

Question

我正在使用 multiple-values checkbox 处理 React Material 自动完成组件，似乎 defaultValue 道具和复选框示例存在问题。

如果我从列表中设置 defaultValue 一个项目，它将出现在文本输入标签中，但它不会显示为在自动完成下拉列表中选中。 如果 defaultValue 中存在，我尝试将项目设置为已检查，但这并没有解决问题。

如何将 defaultValue 项设置为在自动完成下拉菜单中选中？

Condsandbox

代码：

import React from "react";
import Checkbox from "@material-ui/core/Checkbox";
import TextField from "@material-ui/core/TextField";
import Autocomplete from "@material-ui/lab/Autocomplete";
import CheckBoxOutlineBlankIcon from "@material-ui/icons/CheckBoxOutlineBlank";
import CheckBoxIcon from "@material-ui/icons/CheckBox";

const icon = <CheckBoxOutlineBlankIcon fontSize="small" />;
const checkedIcon = <CheckBoxIcon fontSize="small" />;

export default function CheckboxesTags() {
  return (
    <Autocomplete
      multiple
      id="checkboxes-tags-demo"
      options={top100Films}
      defaultValue={[{ title: "The Shawshank Redemption", year: 1994 }]}
      disableCloseOnSelect
      getOptionLabel={option => option.title}
      renderOption={(option, { selected }) => (
        <React.Fragment>
          <Checkbox
            icon={icon}
            checkedIcon={checkedIcon}
            style={{ marginRight: 8 }}
            checked={selected}
          />
          {option.title}
        </React.Fragment>
      )}
      style={{ width: 500 }}
      renderInput={params => (
        <TextField
          {...params}
          variant="outlined"
          label="Checkboxes"
          placeholder="Favorites"
        />
      )}
    />
  );
}

// Top 100 films as rated by IMDb users. http://www.imdb.com/chart/top
const top100Films = [
  { title: "The Shawshank Redemption", year: 1994 },
  { title: "The Godfather", year: 1972 },
  { title: "The Godfather: Part II", year: 1974 },
  { title: "The Dark Knight", year: 2008 },
  { title: "12 Angry Men", year: 1957 },
  { title: "Schindler's List", year: 1993 },
  { title: "Pulp Fiction", year: 1994 },
  { title: "The Lord of the Rings: The Return of the King", year: 2003 },
  { title: "The Good, the Bad and the Ugly", year: 1966 },
  { title: "Fight Club", year: 1999 },
  { title: "The Lord of the Rings: The Fellowship of the Ring", year: 2001 },
  { title: "Star Wars: Episode V - The Empire Strikes Back", year: 1980 },
  { title: "Forrest Gump", year: 1994 },
  { title: "Inception", year: 2010 },
  { title: "The Lord of the Rings: The Two Towers", year: 2002 },
  { title: "One Flew Over the Cuckoo's Nest", year: 1975 },
  { title: "Goodfellas", year: 1990 },
  { title: "The Matrix", year: 1999 },
  { title: "Seven Samurai", year: 1954 },
  { title: "Star Wars: Episode IV - A New Hope", year: 1977 },
  { title: "City of God", year: 2002 },
  { title: "Se7en", year: 1995 },
  { title: "The Silence of the Lambs", year: 1991 },
  { title: "It's a Wonderful Life", year: 1946 },
  { title: "Life Is Beautiful", year: 1997 },
  { title: "The Usual Suspects", year: 1995 },
  { title: "Léon: The Professional", year: 1994 },
  { title: "Spirited Away", year: 2001 },
  { title: "Saving Private Ryan", year: 1998 },
  { title: "Once Upon a Time in the West", year: 1968 },
  { title: "American History X", year: 1998 },
  { title: "Interstellar", year: 2014 }
];

Answer 1

如果您想使用列表中的值设置为 defaultValue 的 Autocomplete 组件 - 您应该使用确切的值（在您的情况下 - 是属于 @ 的确切对象987654324@你有。

您可以使用以下方法（例如）执行此操作：

<Autocomplete
    options={ top100Films }
    defaultValue={ [ top100Films[0] ] }
    ...
/>