其實我正在使用web服務調用以JSON的形式獲取數據。在撥打寧靜的電話後,我將新生成的數據寫入traffic.json
文件。在node.js中刷新頁面後,如何獲取新生成的數據
在提交後的node.js中,我無法獲取新生成的數據,而是獲取了以前的數據。
我Area.html:
<!DOCTYPE html>
<meta charset="utf-8">
<head>
<style>
body {
font: 10px sans-serif;
}
.axis path,
.axis line {
fill: none;
stroke: #000;
shape-rendering: crispEdges;
}
.area {
fill:#00bfff;
}
</style>
</head>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
var margin = {top: 20, right: 20, bottom: 30, left: 50},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
var x = d3.time.scale()
.range([0, width]);
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");
var area = d3.svg.area()
.x(function(d) { return x(d.timestamp); })
.y0(height)
.y1(function(d) { return y(d.total_traffic); });
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 jsonURL = "http://192.168.7.123:3000/data/traffic";
alert(jsonURL);
d3.json(jsonURL, function(error, data){
alert(data);
data.forEach(function(d) {
d.timestamp = d.timestamp;
d.total_traffic = +d.total_traffic;
});
x.domain(d3.extent(data, function(d) { return d.timestamp; }));
y.domain([0, d3.max(data, function(d) { return d.total_traffic; })]);
svg.append("path")
.datum(data)
.attr("class", "area")
.attr("d", area);
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis).append("text")
.attr("x", 875)
.attr("y", 15)
.style("text-anchor", "bottom")
.text("Client");
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("Kilo Bytes");
});
</script>
<p align="center">
<button type="button" class="myButton"
style="margin-left: auto; margin-right: auto; display: block; margin-top: 0%; margin-bottom: 0%"
onclick="history.go(-1);">Back</button>
</p>
</body>
</html>
在Area.html,在這一點上的代碼,我在數據變量中獲得以前的數據,而不是新的數據。
var jsonURL = "http://192.168.7.123:3000/traffic";
alert(jsonURL);
d3.json(jsonURL, function(error, data){
alert(data);
....
....
});
我app.js:
app.get('/data/traffic',function(req,res) {
res.sendfile('views/traffic.json');
});
我traffic.json
[ { "client_ip" : "1.0.230.145" , "timestamp" : "1341667450773" , "total_traffic" : 0} , { "client_ip" : "1.0.230.145" , "timestamp" : "1341667450786" , "total_traffic" : 3} , { "client_ip" : "1.0.230.145" , "timestamp" : "1341667451076" , "total_traffic" : 4} , { "client_ip" : "1.0.230.145" , "timestamp" : "1341667451104" , "total_traffic" : 7} , { "client_ip" : "1.0.230.145" , "timestamp" : "1341667451128" , "total_traffic" : 10}]
我怎樣才能解決這個問題?
燦任何人都可以幫我解決這個問題... – dev333
你可以顯示你當前的代碼嗎? – dimakura
請檢查編輯好的代碼 – dev333