google 可视化 table 中的复选框

Question

请参考以下内容link： http://jsfiddle.net/RjHMH/46/

我正在使用 google visualization table，并像上面那样制作 tree table。 child row 中的某些列，我附加了 html 复选框。

我面临的问题是，如果我单击 checkbox，它永远不会被选中。这是因为在table listener中，每触发一个select事件，就会重新绘制table.

我查看 google visualization table API，发现：

Note that the table chart only fires row selection events; however, the code is generic, and can be used for row, column, and cell selection events.

这意味着如果我点击行中的一列，我永远无法知道我实际点击了哪一列？所以我无法通过 id 获得 checkbox，并使用 javascript 使其成为 checked？太烂了...

Answer 1

事实上，一旦 select 事件被触发，getSelection() 函数就不会保留 column。但是您可以考虑使用以下方法在重新绘制图表后保留复选框状态。

首先，我们需要引入存储复选框状态的对象：

var checkboxStates = {'cbox1' : false, 'cbox2': false};

然后我们为saving/loading状态注册ready事件一次Google图表重绘：

google.visualization.events.addOneTimeListener(table, 'ready', function(){
    //...
 });

最后，以下示例演示了如何 save/load 状态：

//load checkboxes state
for(var id in checkboxStates){
    var checkbox = document.getElementById(id);
    if(checkbox !== null) {
        checkbox.checked = checkboxStates[id];
    }    
}
//save state
if(event.target.type == "checkbox"){
    var checkbox = document.getElementById(event.target.id);  
    checkbox.checked = !event.target.checked;
    checkboxStates[event.target.id] = checkbox.checked;
}

Note: Event.target is utilized to track checkboxes click events

最终示例

下面提供了您的修改示例，能够保留复选框状态

google.load('visualization', '1', {
    packages: ['table']
});
google.setOnLoadCallback(drawTable);

function drawTable() {
    var data = new google.visualization.DataTable();
    data.addColumn('string', 'id');
    data.addColumn('string', 'parentId');
    data.addColumn('boolean', 'visible');
    data.addColumn('number', 'level');
    data.addColumn('string', 'Name');
    data.addColumn('number', 'Value');
    data.addRows([
        ['1', null, true, 1, 'Foo', 10],
        ['1.1', '1', false, 2, 'Foo 1', 2],
        ['1.1.1', '1.1', false, 3, 'Foo 1a', 2],
        ['1.1.2', '1.1', false, 3, 'Foo 1b', 2],
        ['1.2', '1', false, 2, 'Foo 2', 3],
        ['1.3', '1', false, 2, 'Foo 3', 5],
        ['1.3.1', '1.3', false, 3, '<input type="checkbox" id="cbox1" value="second_checkbox">', 1],
        ['1.3.2', '1.3', false, 3, '<input type="checkbox" id="cbox2" value="second_checkbox">', 4],
        ['2', null, true, 1, 'Bar', 14],
        ['2.1', '2', false, 2, 'Bar 1', 6],
        ['2.2', '2', false, 2, 'Bar 2', 7],
        ['2.2.1', '2.2', false, 3, 'Bar 2a', 3],
        ['2.2.2', '2.2', false, 3, 'Bar 2b', 2],
        ['2.2.3', '2.2', false, 3, 'Bar 2c', 2]
    ]);

    // get all rows with children
    // start by finding all child rows (ie, rows with parents)
    var children = data.getFilteredRows([{
        column: 1,
        minValue: '1'
    }]);
    var parentsArray = [];
    var parentId;
    // identify the parents of all children
    for (var i = 0; i < children.length; i++) {
        parentId = data.getValue(children[i], 1);
        if (parentsArray.indexOf(parentId) === -1) {
            parentsArray.push(parentId);
        }
    }

    //format the parent rows
    var parent = data.getFilteredRows([{
        column: 3,
        value: 1
    }]);
    for (var j = 0; j < parent.length; j++) {
        parentId = data.getValue(parent[j], 0);
        if (parentsArray.indexOf(parentId) !== -1) {
            data.setProperty(parent[j], 4, 'className', 'parentcl close');
        }
        else {
            data.setProperty(parent[j], 4, 'className', 'parentcl');
        }
    };
    //format the 2level rows
    var leveltwo = data.getFilteredRows([{
        column: 3,
        value: 2
    }]);
    for (var j = 0; j < leveltwo.length; j++) {
        parentId = data.getValue(leveltwo[j], 0);
        if (parentsArray.indexOf(parentId) !== -1) {
            data.setProperty(leveltwo[j], 4, 'className', 'leveltwo close');
        }
        else {
            data.setProperty(leveltwo[j], 4, 'className', 'leveltwo');
        }
    };
    //format the 3level rows
    var levelthree = data.getFilteredRows([{
        column: 3,
        value: 3
    }]);
    for (var j = 0; j < levelthree.length; j++) {
        data.setProperty(levelthree[j], 4, 'className', 'levelthree');
    };

    var view = new google.visualization.DataView(data);
    // hide the first four columns
    view.setColumns([4, 5]);
    view.setRows(data.getFilteredRows([{
        column: 2,
        value: true
    }]));

    var table = new google.visualization.Table(document.getElementById('table_div'));

    var cssClassNames = {
        headerRow: 'gtableheader',
        oddTableRow: 'rowodd',
        headerCell: 'gtableheader'
    };
    var options = {
        showRowNumber: false,
        allowHtml: true,
        cssClassNames: cssClassNames,
        sort: 'disable'
    };


    var checkboxStates = {'cbox1' : false, 'cbox2': false};


    google.visualization.events.addListener(table, 'select', function () {


        var sel = table.getSelection();
        recurseTree(view.getTableRowIndex(sel[0].row), false);
        view.setRows(data.getFilteredRows([{
            column: 2,
            value: true
        }]));
        table.setSelection(null);
        google.visualization.events.addOneTimeListener(table, 'ready', function(){
            //load checkboxes state
            for(var id in checkboxStates){
                var checkbox = document.getElementById(id);
                if(checkbox !== null) {
                     checkbox.checked = checkboxStates[id];
                }    
            }
            //update state
            if(event.target.type == "checkbox"){
                var checkbox = document.getElementById(event.target.id);  
                checkbox.checked = !event.target.checked;
                checkboxStates[event.target.id] = checkbox.checked;
            }
        });
        table.draw(view, options);

        function recurseTree(row, hideOnly) {
            // get the id of the row
            var id = data.getValue(row, 0);
            // get the parent row
            var parentrow = data.getFilteredRows([{
                column: 0,
                value: id
            }]);
            var parentlevel = data.getValue(parentrow[0], 3);
            // find all child rows
            var rows = data.getFilteredRows([{
                column: 1,
                value: id
            }]);

            for (var i = 0; i < rows.length; i++) {
                if (data.getValue(rows[i], 2)) {
                    // hide the row and recurse down the tree
                    data.setValue(rows[i], 2, false);
                    switch (parentlevel) {
                        case 1:
                            data.setProperty(parentrow[0], 4, 'className', 'parentcl close');
                            break;
                        case 2:
                            data.setProperty(parentrow[0], 4, 'className', 'leveltwo close');
                            break;
                        default:
                            data.setProperty(parentrow[0], 4, 'className', 'levelthree close');
                    }
                    recurseTree(rows[i], true);
                }
                else if (!hideOnly) {
                    // if the row is hidden, show it
                    data.setValue(rows[i], 2, true);
                    switch (parentlevel) {
                        case 1:
                            data.setProperty(parentrow[0], 4, 'className', 'parentcl open');
                            break;
                        case 2:
                            data.setProperty(parentrow[0], 4, 'className', 'leveltwo open');
                            break;
                        default:
                            data.setProperty(parentrow[0], 4, 'className', 'levelthree open');
                    }
                }
            }
        }
    });


    table.draw(view, options);
}

.parentcl{
    font-weight: bold !important;
}
.close:before{
content:"→ "
}
.open:before{
content:"↘ "
}
.leveltwo{
    padding-left: 20px !important;
}
.levelthree{
    padding-left: 45px !important;
    font-style:italic;
}
.gtableheader {
    font-weight: bold;
    background-color: grey;
}
.rowodd {
    background-color: beige;
}

<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<div id="table_div"></div>

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