使用选择触发谷歌时间线工具提示 [英] Trigger google timeline tooltip with selection

问题描述

我需要在选择而不是悬停时触发时间线图表工具提示.这似乎不起作用.

I need to trigger the Timeline chart tooltip on selection instead of hover. This doesn't seem to work.

如果我在图表选项中有这个，我会得到我的工具提示:tooltip: { isHtml: true, trigger: 'focus' }

I get my tooltips if I have this in the chart options: tooltip: { isHtml: true, trigger: 'focus' }

但是如果我把它改成这样:tooltip: { isHtml: true, trigger: 'selection' }，当我点击时间轴栏时，工具提示不显示.

But if I change it to this: tooltip: { isHtml: true, trigger: 'selection' }, the tooltips don't show up when I click the timeline bars.

这应该可以通过时间线图表实现吗?我在文档中找不到任何说它不受支持的内容，尽管我可能错过了一些东西......

Is this supposed to be possible with the Timeline chart? I can't find anything in the docs to say that it isn't supported, although I might have missed something...

推荐答案

唯一支持的 trigger 将在 Timeline-chart 中打开工具提示是 focus

The only supported trigger which will open a tooltip in a Timeline-chart is focus

可能的解决方法:

google.setOnLoadCallback(drawVisualization);

function drawVisualization() {
  var container = document.getElementById('timeline');
  var chart = new google.visualization.Timeline(container);
  var dataTable = new google.visualization.DataTable();

  dataTable.addColumn({
    type: 'string',
    id: 'President'
  });
  dataTable.addColumn({
    type: 'date',
    id: 'Start'
  });
  dataTable.addColumn({
    type: 'date',
    id: 'End'
  });
  dataTable.addRows([
    ['Washington', new Date(1789, 3, 30), new Date(1797, 2, 4)],
    ['Adams', new Date(1797, 2, 4), new Date(1801, 2, 4)],
    ['Jefferson', new Date(1801, 2, 4), new Date(1809, 2, 4)]
  ]);
  //select-handler
  google.visualization.events.addListener(chart, 'select', function(e) {
    //the built-in tooltip
    var tooltip = document.querySelector('.google-visualization-tooltip:not([clone])');
    //remove previous clone when there is any
    if (chart.ttclone) {
      chart.ttclone.parentNode.removeChild(chart.ttclone)
    }
    //create a clone of the built-in tooltip
    chart.ttclone = tooltip.cloneNode(true);
    //create a custom attribute to be able to distinguish
    //built-in tooltip and clone
    chart.ttclone.setAttribute('clone', true);
    //inject clone into document
    tooltip.parentNode.insertBefore(chart.ttclone, chart.tooltip);
  });

  chart.draw(dataTable, {tooltip: {isHtml: true }});
}

.google-visualization-tooltip {
  opacity: 0 !important;
  max-width: 200px !important;
}
.google-visualization-tooltip[clone] {
  opacity: 1 !important;
}
html,
body,
timeline {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}

<script type="text/javascript" src="https://www.google.com/jsapi?autoload={'modules':[{'name':'visualization','version':'1.1','packages':['timeline']}]}"></script>
<div id='timeline' style="height:90%"></div>

它仍然使用默认行为(焦点提示).但是内置的工具提示是隐藏的(通过 CSS)

It still uses the default-behaviour(tooltip on focus). But the built-in tooltip is hidden(via CSS)

在选择处理程序中，它从文档中获取内置工具提示(它是隐藏的，但它仍然存在)并创建一个将被注入到文档中的克隆.

In the select-handler it fetches the built-in tooltip out of the document(it's hidden, but it's still there) and creates a clone which will be injected into the document.

这篇关于使用选择触发谷歌时间线工具提示的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！