[visualization-api] I needed help for Google Chart.

[Vivek Singh]

I am using Google line chart for developing the graph. I need to show 
custom tooltip in which i need to render html code. But the custom tooltip 
only work on single line in graph, but hovering on another lines it show 
default tool tip provided by google chart. I wanted to show html custom 
tool tip on both lines.

Here is my code:

var data = new google.visualization.DataTable();
data.addColumn('number', 'Y');
data.addColumn('number', 'D0 Response');
data.addColumn('number', 'D1 Response');
data.addColumn('number', '');
data.addColumn({type: 'string', role: 'tooltip', p: {'html': true}});

I also try this:
  tooltip: { 
        isHtml: true,
       },

Nothing works.

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