javascript - Multiple Line Transitions - from x lines to y lines in D3.js -


i'm trying have multiple line graph transition set of x number of lines set of y number of lines. after going through many examples (both here @ stackoverflow , wider web) still stumped. please me i'm sure easy fix.

relevant code:

    //--line generators     var line_main = d3.svg.line()         .defined(function (d) {         return d.value != isnan(d.value);     }) //--deals nan results in y range extending 0     .x(function (d) {         return x_main(d.date);     })         .y(function (d) {         return y_main(d.value);     });      var svg = d3.select('#discharge-graph').append('svg')         .attr('class', 'graph')         .attr('width', w + margin.left + margin.right)         .attr('height', h + margin.top + margin.bottom);      var main = svg.append('g')         .attr('transform', 'translate(' + margin.left + ',' + margin.top + ')');      update();      function update() {         //--reset plot elements         d3.selectall("path.line").remove(); //--trying use transitions instead of          //--paths main areas         main.selectall('path.line')             .data(sets)             .enter()             .append('path')             .attr('d', function (d) {             return line_main(d.values);             })             .attr('class', 'line')             .style('stroke', function (d) {             return colour(d.name);         });     };

i have tried many variations comment out line: 

        d3.selectall("path.line").remove();

and add 1 or more of lines of code commented out below:

    //--paths main areas     main.selectall('path.line')     //d3.transition(main).select('path.line')     //.transition().duration(600)         .data(sets)         //.transition().duration(600)         .enter()         .append('path')         .attr('d', function (d) {         return line_main(d.values);     })         .attr('class', 'line')         .style('stroke', function (d) {         return colour(d.name);     });

the result blank canvas. complete code stands @ jsfiddle. insight appreciated.


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