在加载 google 个图表时显示工具提示

Question

我正在尝试使用 tooltip.trigger = 'selection' 和 setSelection([{row:4,column:null}])，但工具提示不会自动显示。仅当您单击另一个工具提示时。

这里 jsfiddle 显示了问题。

有什么我可以尝试的想法吗？

谢谢！

Answer 1

我最终只使用了注释。如果有人想出办法，我肯定会对工具提示感兴趣。

var gmapData = [[{"label":"Date","type":"date"},"One",{"role":"annotation","type":"string"},"Two",{"role":"annotation","type":"string"},"Three",{"role":"annotation","type":"string"}],["Date(2012, 3, 26)",412,null,278,null,149,null],["Date(2012, 3, 27)",410,null,272,null,147,null],["Date(2012, 3, 30)",414,null,280,null,146,null],["Date(2012, 4, 1)",406,"6",268,"8",141,"1"]];

    drawChart();

    function drawChart() {
        var data = window.data = google.visualization.arrayToDataTable(gmapData);

        // apply a tooltip formatting
        var formatter = new google.visualization.NumberFormat({pattern: '$#,###'});
        var cols = (gmapData[0].length-1) / 2;
        x = cols;
        // apply a tooltip formatting
        while ((--x) >= 0)
            formatter.format(data, x*2+1);

        var options = {
            title: 'Number Watch',
            legend: { position: 'bottom' },
            interpolateNulls: true,
            curveType: 'function',
            selectionMode: 'single',
            tooltip: {trigger: 'focus'},
            focusTarget: 'category',
            annotations: {
                textStyle: {
                    fontSize: 18
                }
            },
            vAxis: {format: '$#,###'},
            width: 400,
            height: 300
        };

        var chart = window.chart = new google.visualization.LineChart(document.getElementById('num_watch'));
        chart.draw(data, options);
    }

github issue reply:

Hi,

This is a known bug with focusTarget: 'category'. That particular option uses the mouse position as a signal for how to position the tooltip, and so programmatic selection won't trigger a tooltip to display.

To circumvent this issue, you could use multiple selection on the first load. Here's an example of this, along with a reset that changes the focusTarget back to 'category' at the first opportunity: http://jsfiddle.net/b1kt6mrL/

jsfiddle:

// ..... all previous code, not with the annotations
chart.draw(data, options);
chart.setSelection([{row:4, column:1}, {row:4, column:2}, {row:4, column:3}]);

google.visualization.events.addOneTimeListener(chart, 'onmouseover', function() {
    var selection = chart.getSelection();
    options.focusTarget = 'category';
    options.selectionMode = 'single';
    google.visualization.events.addOneTimeListener(chart, 'ready', function() {
        chart.setSelection(selection);
    });
    chart.draw(data, options);
});

在加载 google 个图表时显示工具提示

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