如何将JSON输出从[WebMethod]映射到d3.js条形图 [英] How to map json output from [WebMethod] to d3.js bar charts
本文介绍了如何将JSON输出从[WebMethod]映射到d3.js条形图的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我是d3.js的新手.我在.aspx文件中有以下[WebMethod]:
[WebMethod]
public static List<Product> GetProductsLINQ()
{
List<Product> lstProducts = new List<Product>();
DataTable dtProducts = new DataTable();
string sqlQuery = "SELECT Product_Name, Purchase_Price FROM tblProductMaster";
string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["BTrax"].ConnectionString;
SqlConnection conn = new SqlConnection(connectionString);
SqlDataAdapter da = new SqlDataAdapter(sqlQuery, conn);
da.Fill(dtProducts);
var productslinq = (from products in dtProducts.AsEnumerable()
select new
{
//Product_Id = products.Field<decimal>("Product_Id"),
Product_Name = products.Field<string>("Product_Name"),
Product_Code = products.Field<decimal>("Purchase_Price"),
}).ToList();
foreach (var product in productslinq)
{
//lstProducts.Add(new Product(product.Product_Id,product.Product_Name, product.Product_Code));
lstProducts.Add(new Product(product.Product_Name, product.Product_Code));
}
return lstProducts;
}
现在,如何使用此输出作为d3.js条形图的输入?我尝试通过将以下脚本粘贴到.aspx文件的body标签中来尝试以下脚本,但它无济于事.请提供解决方案.谢谢.
<script>
var d;
var svg = d3.select("svg"),
margin = { top: 20, right: 20, bottom: 30, left: 40 },
width = +svg.attr("width") - margin.left - margin.right,
height = +svg.attr("height") - margin.top - margin.bottom;
var x = d3.scaleBand().rangeRound([0, width]).padding(0.1),
y = d3.scaleLinear().rangeRound([height, 0]);
var g = svg.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
d3.json("WebForm1.aspx/GetProductsLINQ", function (json) {
d=json
d.Product_Code = +d.Product_Code;
return d;
}, function (error, data) {
if (error) throw error;
x.domain(data.map(function (d) { return d.Product_Name; }));
y.domain([0, d3.max(data, function (d) { return d.Product_Code; })]);
g.append("g")
.attr("class", "axis axis--x")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x));
g.append("g")
.attr("class", "axis axis--y")
.call(d3.axisLeft(y).ticks(10, "%"))
.append("text")
.attr("transform", "rotate(-90)")
.attr("y", 6)
.attr("dy", "0.71em")
.attr("text-anchor", "end")
.text("Frequency");
g.selectAll(".bar")
.data(data)
.enter().append("rect")
.attr("class", "bar")
.attr("x", function (d) { return x(d.Product_Name); })
.attr("y", function (d) { return y(d.Product_Code); })
.attr("width", x.bandwidth())
.attr("height", function (d) { return height - y(d.Product_Code); });
});
</script>
我通过以下链接引用了d3.js,
<script src="https://d3js.org/d3.v4.min.js"></script>
推荐答案
与d3.csv
和d3.tsv
不同,d3.json
不不接受访问器函数(或行函数).
Unlike d3.csv
and d3.tsv
, d3.json
does not accept an accessor function (or row function).
根据 API ,这些是d3.csv
的参数:
d3.csv(URL,行,回调);
d3.csv(url, row, callback);
与d3.json
的参数进行比较:
d3.json(url [,回调])
d3.json(url[, callback])
我要粘贴您的函数并注释掉所有作为访问器(行)函数的内容:
I'm pasting your function and commenting out everything that is an accessor (row) function:
d3.json("WebForm1.aspx/GetProductsLINQ", //function (json) {
//d=json
//d.Product_Code = +d.Product_Code;
//return d;
//},
function (error, data) {
if (error) throw error;
所以,它应该仅仅是:
d3.json("WebForm1.aspx/GetProductsLINQ", function (error, data) {
if (error) throw error;
然后,紧随其后,将访问器(行)函数作为forEach
放在d3.json
中:
And then, right after it, put your accessor (row) function inside d3.json
as a forEach
:
data.forEach(function(d){
d.Product_Code = +d.Product_Code;
});
这篇关于如何将JSON输出从[WebMethod]映射到d3.js条形图的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
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