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[2]React 深入浅出-----React的一个高级表格实现功能

程序员文章站 2022-04-19 19:36:31
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在我们平常的企业级应用程序里面,表格形式的数据的展现和搜索是非常常见的。一般的做法都是在列表的上面,加几个搜索条件,然后最下面放一个搜索按钮,然后通过调用后台的Ajax进行过滤,然后调用JQuery等其他框架,进行 DOM书的更新,当然这个也是一个好的实现方法,但是就是有一点不太优雅。而且不是所见即所得,比如,必须输入了所有的输入条件,才能进行结构的搜索,而且把数据传输到后端,在传回来,性能上不是特别的好。 那么有没有更好的方法,刚好笔者这段时间在学习React,看到了Stoyan Stefanov写的一本书,里面提到了一种个人感觉比较优雅的方式,而且结合React框架本身的性能优势,我想用户体验应该是挺不错的。


[2]React 深入浅出-----React的一个高级表格实现功能


Stoyan的设计的例子如下:

@静态效果:

[2]React 深入浅出-----React的一个高级表格实现功能

@动态效果

[2]React 深入浅出-----React的一个高级表格实现功能


其具体代码如下:

<!DOCTYPE html>
<html>
  <head>
    <title>Table</title>
    <meta charset="utf-8">
    <link rel="stylesheet" type="text/css" href="03.00.table.css">
  </head>
  <body>
    <div id="app">
      <!-- my app renders here -->
    </div>
    <script src="react/build/react.js"></script>
    <script src="react/build/react-dom.js"></script>
    <script>
      var Excel = React.createClass({
        displayName: 'Excel',
        
        propTypes: {
          headers: React.PropTypes.arrayOf(
            React.PropTypes.string
          ),
          initialData: React.PropTypes.arrayOf(
            React.PropTypes.arrayOf(
              React.PropTypes.string
            )
          ),
        },

        getInitialState: function() {
          return {
            data: this.props.initialData,
            sortby: null,
            descending: false,
            edit: null, // [row index, cell index],
            search: false,
          };
        },
        
        _sort: function(e) {
          var column = e.target.cellIndex;
          var data = this.state.data.slice();
          var descending = this.state.sortby === column && !this.state.descending;
          data.sort(function(a, b) {
            return descending 
              ? (a[column] < b[column] ? 1 : -1)
              : (a[column] > b[column] ? 1 : -1);
          });
          this.setState({
            data: data,
            sortby: column,
            descending: descending,
          });
        },
        
        _showEditor: function(e) {
          this.setState({edit: {
            row: parseInt(e.target.dataset.row, 10),
            cell: e.target.cellIndex,
          }});
        },
        
        _save: function(e) {
          e.preventDefault();
          var input = e.target.firstChild;
          var data = this.state.data.slice();
          data[this.state.edit.row][this.state.edit.cell] = input.value;
          this.setState({
            edit: null,
            data: data,
          });
        },
        
        _preSearchData: null,
        
        _toggleSearch: function() {
          if (this.state.search) {
            this.setState({
              data: this._preSearchData,
              search: false,
            });
            this._preSearchData = null;
          } else {
            this._preSearchData = this.state.data;
            this.setState({
              search: true,
            });
          }
        },
        
        _search: function(e) {
          var needle = e.target.value.toLowerCase();
          if (!needle) {
            this.setState({data: this._preSearchData});
            return;
          }
          var idx = e.target.dataset.idx;
          var searchdata = this._preSearchData.filter(function(row) {
            return row[idx].toString().toLowerCase().indexOf(needle) > -1;
          });
          this.setState({data: searchdata});
        },
        
        render: function() {
          return (
            React.DOM.div(null,
              this._renderToolbar(),
              this._renderTable()
            )
          );
        },
        
        _renderToolbar: function() {
          return React.DOM.button(
            {
              onClick: this._toggleSearch,
              className: 'toolbar',
            },
            'search'
          );
        },
        
        _renderSearch: function() {
          if (!this.state.search) {
            return null;
          }
          return (
            React.DOM.tr({onChange: this._search},
              this.props.headers.map(function(_ignore, idx) {
                return React.DOM.td({key: idx},
                  React.DOM.input({
                    type: 'text',
                    'data-idx': idx,
                  })
                );
              })
            )
          );
        },
        
        _renderTable: function() {
          return (
            React.DOM.table(null,
              React.DOM.thead({onClick: this._sort},
                React.DOM.tr(null,
                  this.props.headers.map(function(title, idx) {
                    if (this.state.sortby === idx) {
                      title += this.state.descending ? ' \u2191' : ' \u2193'
                    }
                    return React.DOM.th({key: idx}, title);
                  }, this)
                )
              ),
              React.DOM.tbody({onDoubleClick: this._showEditor},
                this._renderSearch(),
                this.state.data.map(function(row, rowidx) {
                  return (
                    React.DOM.tr({key: rowidx},
                      row.map(function(cell, idx) {
                        var content = cell;
                        var edit = this.state.edit;
                        if (edit && edit.row === rowidx && edit.cell === idx) {
                          content = React.DOM.form({onSubmit: this._save},
                            React.DOM.input({
                              type: 'text',
                              defaultValue: cell,
                            })
                          );
                        }

                        return React.DOM.td({
                          key: idx,
                          'data-row': rowidx,
                        }, content);
                      }, this)
                    )
                  );
                }, this)
              )
            )
          );
        }
      });
      
      var headers = [
        "Book", "Author", "Language", "Published", "Sales"
      ];
      
      var data = [
        ["The Lord of the Rings", "J. R. R. Tolkien", "English", "1954-1955", "150 million"], 
        ["Le Petit Prince (The Little Prince)", "Antoine de Saint-Exupéry", "French", "1943", "140 million"], 
        ["Harry Potter and the Philosopher's Stone", "J. K. Rowling", "English", "1997", "107 million"], 
        ["And Then There Were None", "Agatha Christie", "English", "1939", "100 million"], 
        ["Dream of the Red Chamber", "Cao Xueqin", "Chinese", "1754-1791", "100 million"], 
        ["The Hobbit", "J. R. R. Tolkien", "English", "1937", "100 million"], 
        ["She: A History of Adventure", "H. Rider Haggard", "English", "1887", "100 million"],
      ];
      
      var Ex = ReactDOM.render(
        React.createElement(Excel, {
          headers: headers,
          initialData: data,
        }),
        document.getElementById("app")
      );
    </script>
  </body>
</html>



代码参考:https://github.com/stoyan/react