[visualization-api] dynamically add trendline

[Kostas Poulakidas]

Hello, I have a list of the options the user want to represent in  a 
LineChart. He selects the options and the he draw the Chart. 
Representing the data is ok.

And the result is smh like this https://jsfiddle.net/h7k273yb/

My problem is that I can not dynamically  add trendiness .

*I tried with a loop.*

  var options= {
          width:100,
          height:100
};


var temp=" " ;

for (i = 0; i < options.length; i++) { 
  temp+=  i+": { \
         color: 'black',\
         lineWidth: 6,\
    }";

}


options.trendlines=temp;


*Also I tried with setOption*

chart.setOption('trendlines', temp);


None of them worked! Any ideas??

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