javascript - IF-statement stroke in a line diagram using d3.js -

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i've drawn graph using data out of database, , want line turn red when number in database gets higher 500 (like below). unfortunately doesn't work way, , i've tried other stuff, no succes.

though dashed line work using code .style("stroke-dasharray", ("3, 3"))

my question: possible let stroke color turn red when y value gets higher point in d3.js?

// adds svg canvas var svg = d3.select("body")                                 // explicitly state svg element go on web page (the 'body')     .append("svg")                                          // append 'svg' html 'body' of web page         .attr("width", width + margin.left + margin.right)  // set 'width' of svg element         .attr("height", height + margin.top + margin.bottom)// set 'height' of svg element     .append("g")                                            // append 'g' html 'body' of web page         .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); // in place actual area graph  d3.json("php/data2.php", function(error, data) {            // go data folder (in current directory) , read in data.tsv file     data.foreach(function(d) {                              // data values carry out following         d.date = parsedate(d.date);                         // parse date set format (see parsedate)         d.close = +d.close;                                 // makesure d.close number, not string });  // scale range of data x.domain(d3.extent(data, function(d) { return d.date; }));      // set x domain wide range of dates have. y.domain([0, d3.max(data, function(d) { return d.close; })]);   // set y domain go 0 maximum value of d.close  // add valueline path. svg.append("path")                                      // append valueline line 'path' element     .attr("class", "line")                              // apply 'line' css styles path     .style("stroke-dasharray", ("3, 3"))     .attr("d", valueline(data));                        // call 'valueline' finction draw line  // add x axis svg.append("g")                                         // append x axis 'g' (grouping) element     .attr("class", "x axis")                            // apply 'axis' css styles path     .attr("transform", "translate(0," + height + ")")   // move drawing point 0,height     .call(xaxis);                                       // call xaxis function draw axis  // add y axis svg.append("g")                                         // append y axis 'g' (grouping) element     .attr("class", "y axis")                            // apply 'axis' css styles path     .call(yaxis);                                       // call yaxis function draw axis

your data not binded correctly element, it's difficult tell without complete code. need...

svg.selectall("path")     .data(data)     .enter()     .append("path")                                         .attr("class", "line")                                   .attr("stroke", function(d) {..});

you can see simplified demonstration of code here: http://jsfiddle.net/duopixel/v84fz/


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