材质UI多选不同的代码值和可见值-显示键代替值

时间:2019-04-25 16:47:36

标签: material-ui placeholder multiple-select

我正在根据文档示例使用Material UI Multiple Select。我需要保存所选选项的ID并显示名称,因此我渲染对象。当我使用带占位符的文档中的示例时,我看到的是ID而不是所选名称。 参见:https://codesandbox.io/s/kxz5yqmrzv?from-embed

const names = [
  { id: "a", name: "Oliver Hansen" },
  { id: "b", name: "Van Henry" },
  { id: "c", name: "April Tucker" },
  { id: "d", name: "Ralph Hubbard" },
  { id: "e", name: "Omar Alexander" },
  { id: "f", name: "Carlos Abbott" },
  { id: "g", name: "Miriam Wagner" },
  { id: "h", name: "Bradley Wilkerson" },
  { id: "i", name: "Virginia Andrews" },
  { id: "j", name: "Kelly Snyder" }
];

          <Select
            multiple
            displayEmpty
            value={this.state.name}
            onChange={this.handleChange}
            input={<Input id="select-multiple-placeholder" />}
            renderValue={selected => {
              if (selected.length === 0) {
                return <em>Placeholder</em>;
              }

              return selected.join(", ");
            }}
            MenuProps={MenuProps}
          >
            <MenuItem disabled value="">
              <em>Placeholder</em>
            </MenuItem>
            {names.map(name => (
              <MenuItem
                key={name.id}
                value={name.id}
                // style={getStyles(name, this)}
              >
                {name.name}
              </MenuItem>
            ))}
          </Select>

1 个答案:

答案 0 :(得分:1)

Select只是在执行您在renderValue函数中所要求的操作:

            renderValue={selected => {
              if (selected.length === 0) {
                return <em>Placeholder</em>;
              }
              // This will return a comma-separated list of the values.
              return selected.join(", ");
            }}

您可以通过在选择值时使renderValue未定义来让Material-UI找出正确的显示:

            renderValue={
              this.state.name.length > 0
                ? undefined
                : () => <em>Placeholder</em>
            }

Edit Material demo

还可以使用renderValue数据结构来做更复杂的names来将值转换为名称,但这仅在您要执行不同于默认值的操作时才需要呈现选定的值(例如在Chip演示中)。