javascript - Dygraphs vertical line with label -


i need place vertical line label on dygraph national holiday line in example - http://www.fusioncharts.com/dev/chart-attributes.html?chart=msline

i have searched google 2 hours , can't find examples. can shoot me example or put me on right track? thanks.

best practice today add highlighted region using underlay callback (example).

try specifying "underlaycallback" option within "new dygraph()" call. use html canvas context draw line.

on creating graph:

// graph range on x axis: var xmin=0, xmax=1; // horizontal line y value: var yvalue = 0.5;  new dygraph(document.getelementbyid('garph'), data, {     // graph options     underlaycallback: function(ctx, area, dygraph) {         var xleft =  dygraph.todomcoords(min, yvalue);         var xright = dygraph.todomcoords(max, yvalue);         ctx.strokestyle = 'black';         ctx.beginpath();         ctx.moveto(xleft[0],  xleft[1] );         ctx.lineto(xright[0], xright[1]);         ctx.closepath();         ctx.stroke();     } });

note general example, haven't shown own code.


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