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Big problem with customGridLines



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I tried your code in 3 different browsers and got the expected result (only 1 gridline) in all of them, the only thing strange (but bening) in your code is that customGridLines.add does not return anything so instead of

var customGridLines = chart1.getAxisY().getCustomGridLines().add(customGrid);

I would write


Can you post a link to an image showing how it looks in your case? Have you tried different browsers? 


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I was able to reproduce this.  The issue I had is with animation when no data value is zero along the Y axis.  If animation is turned on the custom grid line draws incorrectly (despite setting scale and attempting other workarounds).  The way to get around this is to render the grid completely and create it, then afterwards do a setTimeout with a delay of 1000 which sets the gridline.  The gridline will then render correctly.

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