javascript - Set view finder in nvd3 line chart to specific time on x scale -


i can't figure out how initialize view finder in nvd3 linewithfocuschart exmaple last 3 days. have timestamp stored in 'data'. chart looks fine, don't know how set focus on specific time (example. have data 1 year period , @ last month @ page load). trying add brushextent without results.

function drawlinechart(id, data, width, height){     var ch = nv.addgraph(function() {      var chart = nv.models.linewithfocuschart()     .width(width)     .height(height)     .x(function(d){return d.x})     .y(function(d){return d.y});  data = [     {         key: "waga",         values: []     } ]; for(var i=0; i<data.data.trackers[0].measurements.length; i++){ // parse data fit line chart structure     data[0].values.push({x: data.data.trackers[0].measurements[i].date, y: parsefloat(data.data.trackers[0].measurements[i].value)}); }  chart.xaxis.tickformat(function(d) {     return d3.time.format('%x')(new date(d * 1000))   });  chart.x2axis.tickformat(function(d) {     return d3.time.format('%x')(new date(d * 1000));   });   chart.yaxis   .tickformat(d3.format(',.2f'));  chart.y2axis   .tickformat(d3.format(',.2f'));     d3.select("#"+id+" svg")   .datum(data)   .call(chart);   nv.utils.windowresize(chart.update);    return chart; }); }


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