以编程方式打开和关闭Chart.js工具提示 [英] Programmatically open and close Chart.js tooltip

问题描述

Chart.js 2.2.1

任何想法如何触发我悬停时运行的代码一个数据点，当我关闭鼠标时它会运行？我需要以编程方式显示和隐藏图表的工具提示。

Any idea how to trigger the code that runs when I hover over a datapoint, and that runs when I move the mouse off? I need to programmatically show and hide a chart's tooltip.

openTip(oChart, datasetIndex, pointIndex){
   // how to open a specific tooltip?
}
closeTip(oChart, datasetIndex, pointIndex){
   // how to close the same tooltip?
}

如果可以，我会展示示例代码，但我甚至不知道从哪儿开始。 图表方法文档没有帮助。

I would show sample code if I could, but I don't even know where to start. The chart method docs haven't helped.

JSFiddle

推荐答案

下面的代码将处理一个或多个工具提示。

The code below will handle one or more tooltips.

function openTip(oChart,datasetIndex,pointIndex){
   if(window.oChart.tooltip._active == undefined)
      window.oChart.tooltip._active = []
   var activeElements = window.oChart.tooltip._active;
   var requestedElem = window.oChart.getDatasetMeta(datasetIndex).data[pointIndex];
   for(var i = 0; i < activeElements.length; i++) {
       if(requestedElem._index == activeElements[i]._index)  
          return;
   }
   activeElements.push(requestedElem);
   //window.oChart.tooltip._view.body = window.oChart.getDatasetMeta(datasetIndex).data;
   window.oChart.tooltip._active = activeElements;
   window.oChart.tooltip.update(true);
   window.oChart.draw();
}

function closeTip(oChart,datasetIndex,pointIndex){
   var activeElements = window.oChart.tooltip._active;
   if(activeElements == undefined || activeElements.length == 0)
     return;
   var requestedElem = window.oChart.getDatasetMeta(datasetIndex).data[pointIndex];
   for(var i = 0; i < activeElements.length; i++) {
       if(requestedElem._index == activeElements[i]._index)  {
          activeElements.splice(i, 1);
          break;
       }
   }
   window.oChart.tooltip._active = activeElements;
   window.oChart.tooltip.update(true);
   window.oChart.draw();
}

@BeetleJuice提供的完整解决方案 - https://jsfiddle.net/ucvvvnm4/5/

Complete solution provided by @BeetleJuice - https://jsfiddle.net/ucvvvnm4/5/

这篇关于以编程方式打开和关闭Chart.js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！