D3與ajax數據的條形圖

Question

我使用http://bl.ocks.org/mbostock/3885304的示例圖表，而不是使用tsv示例，我希望從api調用中使用json。

圖表確實顯示，因爲它給出了一個看起來像單條的大塊。

的JSON從api.php調用返回看起來像這樣

[{"id":"2","name":"wombat","total":"98000","record_date":"2016-01-21 00:00:00"},{"id":"5","name":"wombat","total":"96000","record_date":"2016-02-21 00:00:00"},{"id":"8","name":"wombat","total":"93000","record_date":"2016-03-21 00:00:00"},{"id":"11","name":"wombat","total":"91000","record_date":"2016-04-21 00:00:00"},{"id":"14","name":"wombat","total":"92000","record_date":"2016-05-21 00:00:00"},{"id":"17","name":"wombat","total":"83000","record_date":"2016-06-21 00:00:00"},{"id":"20","name":"wombat","total":"81000","record_date":"2016-07-21 00:00:00"}] 

Plunker

感謝 凱文

Answer 1

您的JSON數據陣列具有record_date屬性而不是event_time。但是你的代碼是指event_time屬性。嘗試將它們替換爲record_date。

我在代碼中找不到其他錯誤。

這裏是工作的代碼段：

var margin = { 
 
    top: 20, 
 
    right: 20, 
 
    bottom: 30, 
 
    left: 40 
 
    }, 
 
    width = 960 - margin.left - margin.right, 
 
    height = 500 - margin.top - margin.bottom; 
 

 
var x = d3.scale.ordinal() 
 
    .rangeRoundBands([0, width], .1); 
 

 
var y = d3.scale.linear() 
 
    .range([height, 0]); 
 

 
var xAxis = d3.svg.axis() 
 
    .scale(x) 
 
    .orient("bottom"); 
 

 
var yAxis = d3.svg.axis() 
 
    .scale(y) 
 
    .orient("left") 
 
    .ticks(10, ""); 
 

 
var svg = d3.select("body").append("svg") 
 
    .attr("width", width + margin.left + margin.right) 
 
    .attr("height", height + margin.top + margin.bottom) 
 
    .append("g") 
 
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); 
 

 
var data = [{ 
 
    "id": "2", 
 
    "name": "wombat", 
 
    "total": "98000", 
 
    "record_date": "2016-01-21 00:00:00" 
 
}, { 
 
    "id": "5", 
 
    "name": "wombat", 
 
    "total": "96000", 
 
    "record_date": "2016-02-21 00:00:00" 
 
}, { 
 
    "id": "8", 
 
    "name": "wombat", 
 
    "total": "93000", 
 
    "record_date": "2016-03-21 00:00:00" 
 
}, { 
 
    "id": "11", 
 
    "name": "wombat", 
 
    "total": "91000", 
 
    "record_date": "2016-04-21 00:00:00" 
 
}, { 
 
    "id": "14", 
 
    "name": "wombat", 
 
    "total": "92000", 
 
    "record_date": "2016-05-21 00:00:00" 
 
}, { 
 
    "id": "17", 
 
    "name": "wombat", 
 
    "total": "83000", 
 
    "record_date": "2016-06-21 00:00:00" 
 
}, { 
 
    "id": "20", 
 
    "name": "wombat", 
 
    "total": "81000", 
 
    "record_date": "2016-07-21 00:00:00" 
 
}]; 
 

 
var k = []; 
 
data.forEach(function(d) { 
 
    d.record_date = d.record_date; 
 
    d.total = +d.total; 
 
    k.push(d.record_date) 
 
}); 
 

 
x.domain(data.map(function(d) { 
 
    return d.record_date; 
 
})); 
 
y.domain([0, d3.max(data, function(d) { 
 
    return d.total; 
 
})]); 
 

 
svg.append("g") 
 
    .attr("class", "x axis") 
 
    .attr("transform", "translate(0," + height + ")") 
 
    .call(xAxis); 
 

 
svg.append("g") 
 
    .attr("class", "y axis") 
 
    .call(yAxis) 
 
    .append("text") 
 
    .attr("transform", "rotate(-90)") 
 
    .attr("y", 6) 
 
    .attr("dy", ".71em") 
 
    .style("text-anchor", "end") 
 
    .text("Count"); 
 

 
svg.selectAll(".bar") 
 
    .data(data) 
 
    .enter().append("rect") 
 
    .attr("class", "bar") 
 
    .attr("x", function(d) { 
 
    return x(d.record_date); 
 
    }) 
 
    .attr("width", x.rangeBand()) 
 
    .attr("y", function(d) { 
 
    return y(d.total); 
 
    }) 
 
    .attr("height", function(d) { 
 
    return height - y(d.total); 
 
    }); 
 

 

 
function type(d) { 
 
    d.total = +d.total; 
 
    return d; 
 
}

.bar { 
 
    fill: steelblue; 
 
} 
 
.bar:hover { 
 
    fill: brown; 
 
} 
 
.axis { 
 
    font: 10px sans-serif; 
 
} 
 
.axis path, 
 
.axis line { 
 
    fill: none; 
 
    stroke: #000; 
 
    shape-rendering: crispEdges; 
 
} 
 
.x.axis path { 
 
    display: none; 
 
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>