Question

尝试创建自定义自动完成编辑器时出现奇怪的问题。

基本上，我所做的是提取内置的AutocompleteEditor类，并将其重构为普通的ES6，然后将该类重命名为ProductSelectEditor。无需修改代码逻辑。

当我尝试使用它时，在调用handleChange（）时出现错误“无法读取未定义的属性'onCommit'”

handleChange() {
  this.props.onCommit(); // props undefined
}

现在，如果我用真正的内置AutocompleteEditor替换编辑器，它就可以正常工作。我看不出任何直接原因，为什么我的自定义版本不起作用，当我仅做更改时，将代码从TypeScript重构出来，重命名该类，并最终将该类导出为默认值吗？关于我在这里不了解的任何线索吗？

下面是整个重构代码

import React from 'react'
import ReactDOM from 'react-dom'
import ReactAutocomplete from  'ron-react-autocomplete';
import PropTypes from 'prop-types';
import '../css/ron-react-autocomplete.css'
const { shapes: { ExcelColumn } } = require('react-data-grid')

let optionPropType = PropTypes.shape({
  id: PropTypes.required,
  title: PropTypes.string
});

export default class ProductSelectEditor extends React.Component {
  static propTypes = {
    onCommit: PropTypes.func,
    options: PropTypes.arrayOf(optionPropType),
    label: PropTypes.any,
    value: PropTypes.any,
    height: PropTypes.number,
    valueParams: PropTypes.arrayOf(PropTypes.string),
    column: PropTypes.shape(ExcelColumn),
    resultIdentifier: PropTypes.string,
    search: PropTypes.string,
    onKeyDown: PropTypes.func,
    onFocus: PropTypes.func,
    editorDisplayValue: PropTypes.func
  };

  static defaultProps = {
    resultIdentifier: 'id'
  };

  handleChange() {
    this.props.onCommit();
  }

  getValue() {
    let value;
    let updated = {};
    if (this.hasResults() && this.isFocusedOnSuggestion()) {
      value = this.getLabel(this.autoComplete.state.focusedValue);
      if (this.props.valueParams) {
        value = this.constuctValueFromParams(this.autoComplete.state.focusedValue, this.props.valueParams);
      }
    } else {
      value = this.autoComplete.state.searchTerm;
    }
    updated[this.props.column.key] = value;
    return updated;
  }

  getEditorDisplayValue() {
    let displayValue = {title: ''};
    let { column, value, editorDisplayValue } = this.props;
    if (editorDisplayValue && typeof editorDisplayValue === 'function') {
      displayValue.title = editorDisplayValue(column, value);
    } else {
      displayValue.title = value;
    }
    return displayValue;
  }

  getInputNode() {
    return ReactDOM.findDOMNode(this).getElementsByTagName('input')[0];
  }

  getLabel(item) {
    let label = this.props.label != null ? this.props.label : 'title';
    if (typeof label === 'function') {
      return label(item);
    } else if (typeof label === 'string') {
      return item[label];
    }
  }

  hasResults() {
    return this.autoComplete.state.results.length > 0;
  }

  isFocusedOnSuggestion() {
    let autoComplete = this.autoComplete;
    return autoComplete.state.focusedValue != null;
  }

  constuctValueFromParams(obj, props) {
    if (!props) {
      return '';
    }
    let ret = [];
    for (let i = 0, ii = props.length; i < ii; i++) {
      ret.push(obj[props[i]]);
    }
    return ret.join('|');
  }

  render() {
    let label = this.props.label != null ? this.props.label : 'title';
    return (<div height={this.props.height} onKeyDown={this.props.onKeyDown}>
      <ReactAutocomplete search={this.props.search} ref={(node) => this.autoComplete = node} label={label} onChange={this.handleChange} onFocus={this.props.onFocus} resultIdentifier={this.props.resultIdentifier} options={this.props.options} value={this.getEditorDisplayValue()} />
      </div>);
  }
}

Answer 1

好吧，经过几个小时的戳戳和重整后，发现道具的原因尚未确定。显然，在去除打字稿后，我需要重新绑定“ this”以获得正确的上下文：

<ReactAutocomplete ... onChange={this.handleChange.bind(this)} ... />

定制编辑器react-data-grid

1 个答案: