搜索框可以过滤数据,然后显示路径?

时间:2018-08-21 03:38:44

标签: javascript d3.js

我正在尝试制作一个d3散点图,以在网页上提供一个搜索框;当用户在搜索框中输入单词时,d3会根据该单词过滤数据集,然后通过散点图上经过过滤的点创建路径。

我已经设法使代码达到可以将搜索词放入代码中并达到预期效果(jsfiddle)的地步,但是,当然,我不希望我的用户拥有打开文本编辑器以搜索数据集。

我喜欢Gerardo Furtado的method of changing the attribute of the node

d3.select("button").on("click", function() {
  var txtName = d3.select("#txtName").node().value;
  circles.style("fill", function(d) {
  return d.doc === txtName ? "red" : "black";

根据他的回答,我已经尝试过将这段代码附加到图形上的代码放置在代码中。我没有错误,但也没有任何一行:

d3.select("button").on("click", function() {
  var txtName = d3.select("#txtName")
  chartGroup.selectAll(".line")
        .data(nest)
        .enter()
        .filter(function(d){return d.key == txtName;})
        .append("path")
          .attr("class","line")
          .attr("d",function(d) {return line(d.values)})
          .attr("stroke", function(d) {return colors(d.key)})
          .attr("stroke-width","2px")
          .style("stroke-dasharray", ("3, 3"))

我也看过Amber Thomas's multi-line graph,但是我无法理解过滤函数后面的代码块。

任何帮助表示赞赏

1 个答案:

答案 0 :(得分:2)

这里有几种不同的解决方案。您可以绘制所有路径,并且不透明度为零:

    var cssLink = document.getElementByTagName('link')[2];

    var prtContent = document.getElementById('print_body');

    var WinPrint = window.open('','','left=0,top=0,width=1000,height=auto,toolbar=0,scrollbars=0,status=0');

    WinPrint.document.write(prtContent.innerHTML);
    WinPrint.document.getElementsByTagName('head')[0].appendChild(link);
    WinPrint.document.close();

    WinPrint.focus();
    WinPrint.print();

然后在单击后更改不透明度:

var lines = chartGroup.selectAll(".line")
  .data(nest)
  .enter()
  .append("path")
  .style("opacity", 0)
  .attr("class", "line")
  .attr("d", function(d) {
    return line(d.values)
  })
  .attr("stroke", function(d) {
    return colors(d.key)
  })
  .attr("stroke-width", "2px")
  .style("stroke-dasharray", ("3, 3"));

这是产生的演示:

d3.select("button").on("click", function() {
  var txtName = d3.select("#txtName").node().value;
  circles.style("fill", function(d) {
    return d.doc === txtName ? "red" : "black";
  })
  lines.style("opacity", function(d) {
    return d.key === txtName ? 1 : 0;
  })
})
var parseDate = d3.timeParse("%m/%d/%Y");
mycolour = d3.rgb("#f7f7f7");

var doc = `date	number	creator		doc
6/16/2000	3	molly	3	rat
2/25/2002	4	may	2	cat
12/05/2004	3	molly	4	fish
07/06/2006	1	milly	1	dog
09/07/2003	4	may	4	fish
12/10/2001	4	may	3	rat
6/15/2005	2	maggie	3	rat
06/09/2004	1	milly	4	fish
10/05/2005	1	milly	3	rat
10/07/2003	4	may	1	dog
1/19/2009	4	may	2	cat
10/30/2007	1	milly	4	fish
8/13/2009	4	may	2	cat
9/30/2004	3	molly	1	dog
1/17/2006	4	may	3	rat
12/18/2009	3	molly	1	dog
11/02/2007	2	maggie	3	rat
4/17/2007	1	milly	4	fish`;

var data = d3.tsvParse(doc, function(d) {
  return {
    creator: d.creator,
    date: parseDate(d.date),
    number: Number(d.number),
    doc: d.doc
  };
});

var height = 300;
var width = 500;


function sortByDateAscending(a, b) {
  return a.date - b.date;
}

data = data.sort(sortByDateAscending);


margin = {
  top: 40,
  right: 50,
  bottom: 0,
  left: 50
};

var minDate = new Date(2000, 1, 1);
var maxDate = new Date(2011, 1, 1);



var y = d3.scalePoint()
  .domain(['may', 'milly', 'maggie', 'molly'])
  .range([height, 0])
  .padding(0.2);

var x = d3.scaleTime()
  .domain([minDate, maxDate])
  .range([0, width]);

var yAxis = d3.axisLeft(y);
var xAxis = d3.axisBottom(x);

var svg = d3.select("body").append("svg").attr("height", height + 100).attr("width", width + 100);

var chartGroup = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")")

var line = d3.line()
  .x(function(d) {
    return x(d.date);
  })
  .y(function(d) {
    return y(d.creator);
  });

var redBox = chartGroup.append("rect")
  .attr("y", 0)
  .attr("width", width)
  .attr("height", height)
  .attr("fill", mycolour)
  .append("g");

var nest = d3.nest()
  .key(function(d) {
    return d.doc;
  })
  .entries(data);



var colors = d3.scaleOrdinal()
  .domain(function(d) {
    return colors(d.key)
  })
  .range(["#e66101", "#fdb863", "#b2abd2", "#5e3c99"]);

var line = d3.line()
  .x(function(d, i) {
    return x(d.date);
  })
  .y(function(d, i) {
    return y(d.creator);
  });

var lines = chartGroup.selectAll(".line")
  .data(nest)
  .enter()
  .append("path")
  .style("opacity", 0)
  .attr("class", "line")
  .attr("d", function(d) {
    return line(d.values)
  })
  .attr("stroke", function(d) {
    return colors(d.key)
  })
  .attr("stroke-width", "2px")
  .style("stroke-dasharray", ("3, 3"));

var circles = chartGroup.selectAll("circle")
  .data(data)
  .enter().append("circle")
  .attr("cx", function(d) {
    return x(d.date);
  })
  .attr("cy", function(d) {
    return y(d.creator);
  })
  .attr("r", 4)
  .style("fill", "black");


d3.select("button").on("click", function() {
  var txtName = d3.select("#txtName").node().value;
  circles.style("fill", function(d) {
    return d.doc === txtName ? "red" : "black";
  })
  lines.style("opacity", function(d) {
    return d.key === txtName ? 1 : 0;
  })
})


chartGroup.append("g").attr("class", "x axis").attr("transform", "translate(0," + height + ")").call(d3.axisBottom(x).ticks(14));
chartGroup.append("g").attr("class", "y axis").call(d3.axisLeft(y).ticks(5));
path {
  fill: none;
}


/* circle {
  fill: #FF00FF;
  stroke:navy;
  stroke-width:2px; */


}
g.tick text y {
  font-size: 30px;
  font: Garamond;
}
g.tick text x {
  font-size: 10px;
  font: Garamond;
}
g.tick line {
  display: none;
}

另一方面,如果您真的想将该代码块放在侦听器中,那就是问题:

当你做...

<script src="https://d3js.org/d3.v4.min.js"></script>
<textarea id="txtName" name="txt-Name" placeholder="Search for something.."></textarea>
<button>Try it</button>

...您正在选择一个现有元素,因此您的输入选择为空。取而代之的是,选择一些新类,例如:

chartGroup.selectAll(".line")

这是更新的JSFiddle:here

但是,这种方法的问题是,除非您创建正确的输入/更新/退出选择,否则行会堆积。