D3 Axis Tips#2" - Custom Tick Label by shimizu

index.html

<!DOCTYPE html>
<html lang="jp">
<meta name="viewport" content="width=device-width, initial-scale=1">
<head>
<style>
html, body {
    margin: 0px;
    padding: 0px;
    width:100%;
    height: 100%;
}
    
#chart {
    width:80%;
    height: 80%;
    border: 8px dashed gray;
    border-left: none;
    border-top:none;
    cursor:all-scroll;
}
#chart svg{
    width: 100%;
    height: 100%;
    cursor: default;
}

.grid .tick line {
    stroke-dasharray:1;
}
    
</style>

<script src="//unpkg.com/babel-standalone@6.26.0/babel.min.js"></script>
<script src="//unpkg.com/d3@4.12.2/build/d3.min.js"></script>    
</head>
<body>
<div id="chart">
    <svg></svg>
</div>



<script ="text/babel">
const svg = d3.select("#chart").select("svg");
const grid = svg.append("g").classed("grid", true);
const plot = svg.append("g").classed("plot", true);
const axis = svg.append("g").classed("axis", true);
const yScale = d3.scaleLinear().domain([100, 0]);
const xScale = d3.scaleTime().domain([new Date(2016,1,1), new Date(2018,1,1)])

const yearFormat = d3.timeFormat("%Y年");
const monthFormat = d3.timeFormat("%m月");

render();

function render(){
    const m = {top:40, left:80, right:40, bottom:40};
    const w = svg.node().clientWidth || svg.node().parentNode.clientWidth;
    const h = svg.node().clientHeight || svg.node().parentNode.clientHeight;
    const pw = w - (m.left + m.right);
    const ph = h - (m.top + m.bottom);
    
    const breakpoint = 480; //スマートフォン用のブレイクポイント
    
    
    yScale.range([0, ph]);
    xScale.range([0, pw]);
        
    //axis layer
    axis.attr("transform", `translate(${m.left}, ${m.top})`);
    
    //y axis    
    const yAxisUpdate = axis.selectAll(".yAxis").data([null]);
    const yAxisEnter = yAxisUpdate.enter().append("g").classed("yAxis", true);
    
    const renderYAxis = d3.axisLeft().scale(yScale)
        .tickFormat( (d,i) => {
            if(i === 0) return  `${d} (千万円)`;
            return d;
        });
            
    
    const yAxis = yAxisUpdate.merge(yAxisEnter).call(renderYAxis);
    
    yAxis.select(".domain").remove();
    yAxis.selectAll(".tick line").remove();
    
    
    //x axis
    const xAxisUpdate = axis.selectAll(".xAxis").data([null]);
    const xAxisEnter = xAxisUpdate.enter().append("g").classed("xAxis", true);
    
    const renderXAxis =  d3.axisBottom().scale(xScale)
        .tickFormat(d => { //tick custom
            const year = yearFormat(d);
            const month = monthFormat(d).replace(/^0/, "");
            return (d.getMonth() == 0 && w > breakpoint) ?  year + month:  month; //１月の軸だけ年をつけて表示する
        });
    
    
    
    
    
    const xAxis = xAxisUpdate.merge(xAxisEnter).call(renderXAxis)
        .attr("transform", `translate(0, ${ph})`);
        
    xAxis.select(".domain").remove();
    xAxis.selectAll(".tick line").remove();
        
        
    //grid layer
    grid.attr("transform", "translate("+[m.left, m.top]+")");
    
    //y grid
    const yGridUpdate = grid.selectAll(".yGrid").data([null]);
    const yGridEnter = yGridUpdate.enter().append("g").classed("yGrid", true);
    
    const yGrid = yGridUpdate.merge(yGridEnter).call( d3.axisLeft().scale(yScale).tickSizeInner(-pw).tickFormat(()=>null) )

    yGrid.select(".domain").remove();
    
    
}



//divエレメントをドラッグでリサイズできるようにする。
const dispatch = d3.dispatch("resize");    
dispatch.on("resize", render);
setResizeControler();


function setResizeControler(){
    const drag = d3.drag()
        .on("drag", resized)
    
    d3.select("#chart")    
        .call(drag);
    
    function resized(e){
        const s = d3.event.sourceEvent;
        const w = (s.pageX < 300) ? 300 : s.pageX;
        const h = (s.pageY < 200) ? 200 : s.pageY;
        
        d3.select(this)
            .style("width", `${w}px`)
            .style("height", `${h}px`)
            .attr("data-test", "test")
        
        dispatch.call("resize");
        
    }
    
}
    
    
    
</script>


</body>
</html>