已经度过最后2天通过计算器和网上的例子看,为什么我的图表显示不正常。
我敢肯定,我失去了一些东西在代码中的缩放部分的条款。如果我在X轴下方复制黑暗部分在图表上到记事本它给了我所有的X轴元素。
任何人都可以点我在正确的方向?
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.8.0/d3.min.js"></script>
<script>
document.addEventListener('DOMContentLoaded',function(){
req.open("GET",'https://raw.githubusercontent.com/freeCodeCamp/ProjectReferenceData/master/GDP-data.json',true);
req.send();
req.onload=function(){
json=JSON.parse(req.responseText);
document.getElementsByClassName('title')[0].innerHTML=json.name;
dataset=json.data;
const w = 500;
const h = 300;
const padding = 10;
// create an array with all date names
const dates = dataset.map(function(d) {
return d[0];
});
const xScale = d3.scaleBand()
.rangeRound([padding, w-padding])
.padding([.02])
.domain(dates);
console.log("Scale Bandwidth: " + xScale.bandwidth());
const yScale = d3.scaleLinear()
.rangeRound([h-padding, padding])
.domain(0,d3.max(dataset, (d)=>d[1]));
console.log("Dataset Max Height: " + d3.max(dataset, (d)=>d[1]));
const xAxis = d3.axisBottom(xScale);
const yAxis = d3.axisLeft(yScale);
const svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
svg.append("g")
.attr("transform", "translate(0," + (h - padding) + ")")
.call(xAxis);
svg.append("g")
.attr("transform", "translate(" + padding + ",0)")
.call(yAxis);
svg.selectAll("rect")
.data(dataset)
.enter()
.append("rect")
.attr("width",(d,i)=>xScale.bandwidth())
.attr("height",(d,i)=>(h-yScale(d[1])))
.attr("x", (d,i)=>xScale(d[0]))
.attr("y", (d,i)=>yScale(d[1]))
.attr("fill", "navy")
.attr("class", "bar");
};
});
</script>
<h1 class="title">Title Will Go Here</h1>
</body>
D3现在使用的承诺,而不是异步回调加载数据。承诺简化异步代码的结构,尤其是在支持异步和等待的现代浏览器。
还有,你是正确的,你的yScale坏了。 Linear scales需要的范围和域,每个被传递一个2值数组。
const yScale = d3.scaleLinear()
.range([h - padding, padding])
.domain([0, d3.max(dataset, (d) => d[1])]);
document.addEventListener('DOMContentLoaded', async function() {
const res = await d3.json("https://raw.githubusercontent.com/freeCodeCamp/ProjectReferenceData/master/GDP-data.json");
//console.log(res.data)
const dataset = res.data
const w = 500;
const h = 300;
const padding = 10;
// create an array with all date names
const dates = dataset.map(function(d) {
return d[0];
});
const max = d3.max(dataset, function(d) { return d[1]} )
const xScale = d3.scaleBand()
.rangeRound([0, w])
.padding([.02])
.domain(dates);
console.log("Scale Bandwidth: " + xScale.bandwidth());
const yScale = d3.scaleLinear()
.range([h - padding, padding])
.domain([0, d3.max(dataset, (d) => d[1])]);
console.log("Dataset Max Height: " + d3.max(dataset, (d) => d[1]));
const xAxis = d3.axisBottom(xScale);
const yAxis = d3.axisLeft(yScale);
const svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
svg.append("g")
.attr("transform", "translate(0," + (h - padding) + ")")
.call(xAxis);
svg.append("g")
.attr("transform", "translate(" + padding + ",0)")
.call(yAxis);
svg.selectAll("rect")
.data(dataset)
.enter()
.append("rect")
.attr("width", (d, i) => xScale.bandwidth())
.attr("height", (d, i) => (h - yScale(d[1])) )
.attr("x", (d, i) => xScale(d[0]))
.attr("y", (d, i) => yScale(d[1]))
.attr("fill", "navy")
.attr("class", "bar");
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.8.0/d3.min.js"></script>