我如何处理数据过滤上的一个按钮点击D3.js
How can I handle data filtering on a button click on D3.js?
我有一个D3.js图表我正在工作，它工作得很好。然而，我试图在我的主html上添加按钮来处理数据过滤。这些按钮由外部操作。我似乎想不出最好的方法来处理这个功能，使它工作。任何帮助都将非常感激。这里是源代码。
对于"Popular"的单击事件，我希望显示值大于5的节点。在奇迹。json，我有一个流行属性值。当我点击All时，它应该会显示所有的数据。
任何输入将非常感谢。
index . html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Marvel Characters | Force layout with images</title>
<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
<style>
@import url(http://fonts.googleapis.com/css?family=Source+Code+Pro:400,600);
body {font-family: "Source Code Pro", Consolas, monaco, monospace; line-height: 160%; font-size: 16px; margin: 0; }
path.link {
fill: none;
stroke-width: 2px;
}
.node:not(:hover) .nodetext {
display: none;
}
h1 { font-size: 36px; margin: 10px 0; text-transform: uppercase; font-weight: normal;}
h2, h3 { font-size: 18px; margin: 5px 0 ; font-weight: normal;}
header {padding: 20px; position: absolute; top: 0; left: 0;}
a:link { color: #EE3124; text-decoration: none;}
a:visited { color: #EE3124; }
a:hover { color: #A4CD39; text-decoration: underline;}
a:active { color: #EE3124; }
</style>
</head>
<body>
<header>
<!-- D3 BUTTONS -->
<div class="btn-group" role="group">
<button type="button" class="btn btn-default button1 active">All</button>
<button type="button" class="btn btn-default button3">Popular</button>
</div>
<h1>Marvel Characters</h1>
<h2>Click to view their identity</h2>
<h3>And link to their web page!</h3>
</header>
<!-- container for force layout visualisation -->
<section id="vis"></section>
<script>
// some colour variables
var tcBlack = "#130C0E";
// rest of vars
var w = 960,
h = 800,
maxNodeSize = 50,
x_browser = 20,
y_browser = 25,
root;
var vis;
var force = d3.layout.force();
vis = d3.select("#vis").append("svg").attr("width", w).attr("height", h);
d3.json("marvel.json", function(json) {
root = json;
root.fixed = true;
root.x = w / 2;
root.y = h / 4;
// Build the path
var defs = vis.insert("svg:defs")
.data(["end"]);
defs.enter().append("svg:path")
.attr("d", "M0,-5L10,0L0,5");
update();
});
/**
*
*/
function update() {
var nodes = flatten(root),
links = d3.layout.tree().links(nodes);
// Restart the force layout.
force.nodes(nodes)
.links(links)
.gravity(0.05)
.charge(-1500)
.linkDistance(100)
.friction(0.5)
.linkStrength(function(l, i) {return 1; })
.size([w, h])
.on("tick", tick)
.start();
var path = vis.selectAll("path.link")
.data(links, function(d) { return d.target.id; });
path.enter().insert("svg:path")
.attr("class", "link")
// .attr("marker-end", "url(#end)")
.style("stroke", "#eee");
// Exit any old paths.
path.exit().remove();
// Update the nodes…
var node = vis.selectAll("g.node")
.data(nodes, function(d) { return d.id; });
// Enter any new nodes.
var nodeEnter = node.enter().append("svg:g")
.attr("class", "node")
.attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; })
.on("click", click)
.call(force.drag);
// Append a circle
nodeEnter.append("svg:circle")
.attr("r", function(d) { return Math.sqrt(d.size) / 10 || 4.5; })
.style("fill", "#eee");
// Append images
var images = nodeEnter.append("svg:image")
.attr("xlink:href", function(d) { return d.img;})
.attr("x", function(d) { return -25;})
.attr("y", function(d) { return -25;})
.attr("height", 50)
.attr("width", 50);
// make the image grow a little on mouse over and add the text details on click
var setEvents = images
// Append hero text
.on( 'click', function (d) {
d3.select("h1").html(d.hero);
d3.select("h2").html(d.name);
d3.select("h3").html ("Take me to " + "<a href='" + d.link + "' >" + d.hero + " web page ⇢"+ "</a>" );
})
.on( 'mouseenter', function() {
// select element in current context
d3.select( this )
.transition()
.attr("x", function(d) { return -60;})
.attr("y", function(d) { return -60;})
.attr("height", 100)
.attr("width", 100);
})
// set back
.on( 'mouseleave', function() {
d3.select( this )
.transition()
.attr("x", function(d) { return -25;})
.attr("y", function(d) { return -25;})
.attr("height", 50)
.attr("width", 50);
});
// Append hero name on roll over next to the node as well
nodeEnter.append("text")
.attr("class", "nodetext")
.attr("x", x_browser)
.attr("y", y_browser +15)
.attr("fill", tcBlack)
.text(function(d) { return d.hero; });
// Exit any old nodes.
node.exit().remove();
// Re-select for update.
path = vis.selectAll("path.link");
node = vis.selectAll("g.node");
function tick() {
path.attr("d", function(d) {
var dx = d.target.x - d.source.x,
dy = d.target.y - d.source.y,
dr = Math.sqrt(dx * dx + dy * dy);
return "M" + d.source.x + ","
+ d.source.y
+ "A" + dr + ","
+ dr + " 0 0,1 "
+ d.target.x + ","
+ d.target.y;
});
node.attr("transform", nodeTransform);
}
}
/**
* Gives the coordinates of the border for keeping the nodes inside a frame
* http://bl.ocks.org/mbostock/1129492
*/
function nodeTransform(d) {
d.x = Math.max(maxNodeSize, Math.min(w - (d.imgwidth/2 || 16), d.x));
d.y = Math.max(maxNodeSize, Math.min(h - (d.imgheight/2 || 16), d.y));
return "translate(" + d.x + "," + d.y + ")";
}
/**
* Toggle children on click.
*/
function click(d) {
if (d.children) {
d._children = d.children;
d.children = null;
} else {
d.children = d._children;
d._children = null;
}
update();
}
/**
* Returns a list of all nodes under the root.
*/
function flatten(root) {
var nodes = [];
var i = 0;
function recurse(node) {
if (node.children)
node.children.forEach(recurse);
if (!node.id)
node.id = ++i;
nodes.push(node);
}
recurse(root);
return nodes;
}
</script>
</body>
</html>
marvel.json
{
"name": "marvel",
"img": "https://dl.dropboxusercontent.com/u/19954023/marvel_force_chart_img/marvel.png",
"children": [
{
"name": "Heroes",
"children": [
{
"hero": "Spider-Man",
"name": "Peter Benjamin Parker",
"link": "http://marvel.com/characters/54/spider-man",
"img": "https://dl.dropboxusercontent.com/u/19954023/marvel_force_chart_img/top_spiderman.png",
"size": 40000,
"popularity": 1
},
{
"hero": "CAPTAIN MARVEL",
"name": "Carol Danvers",
"link": "http://marvel.com/characters/9/captain_marvel",
"img": "https://dl.dropboxusercontent.com/u/19954023/marvel_force_chart_img/top_captainmarvel.png",
"size": 40000,
"popularity": 3
},
{
"hero": "HULK",
"name": "Robert Bruce Banner",
"link": "http://marvel.com/characters/25/hulk",
"img": "https://dl.dropboxusercontent.com/u/19954023/marvel_force_chart_img/top_hulk.png",
"size": 40000,
"popularity": 6
},
{
"hero": "Black Widow",
"name": "Natalia 'Natasha' Alianovna Romanova",
"link": "http://marvel.com/characters/6/black_widow",
"img": "https://dl.dropboxusercontent.com/u/19954023/marvel_force_chart_img/top_blackwidow.png",
"size": 40000,
"popularity": 7
},
{
"hero": "Daredevil",
"name": "Matthew Michael Murdock",
"link": "http://marvel.com/characters/11/daredevil",
"img": "https://dl.dropboxusercontent.com/u/19954023/marvel_force_chart_img/top_daredevil.png",
"size": 40000,
"popularity": 7
},
{
"hero": "Wolverine",
"name": "James Howlett",
"link": "http://marvel.com/characters/66/wolverine",
"img": "https://dl.dropboxusercontent.com/u/19954023/marvel_force_chart_img/top_wolverine.png",
"size": 40000,
"popularity": 8
},
{
"hero": "Captain America",
"name": "Steven Rogers",
"link": "http://marvel.com/characters/8/captain_america",
"img": "https://dl.dropboxusercontent.com/u/19954023/marvel_force_chart_img/top_captainamerica.png",
"size": 40000,
"popularity": 9
},
{
"hero": "Iron Man",
"name": "Anthony Edward 'Tony' Stark",
"link": "http://marvel.com/characters/29/iron_man",
"img": "https://dl.dropboxusercontent.com/u/19954023/marvel_force_chart_img/top_ironman.png",
"size": 40000,
"popularity": 4
},
{
"hero": "THOR",
"name": "Thor Odinson",
"link": "http://marvel.com/characters/60/thor",
"img": "https://dl.dropboxusercontent.com/u/19954023/marvel_force_chart_img/top_thor.png",
"size": 40000,
"popularity": 5
}
]
},
{
"name": "Villains",
"children": [
{
"hero": "Dr. Doom",
"name": "Victor von Doom",
"link": "http://marvel.com/characters/13/dr_doom",
"img": "https://dl.dropboxusercontent.com/u/19954023/marvel_force_chart_img/drdoom.png",
"size": 40000,
"popularity": 6
},
{
"hero": "Mystique",
"name": "Unrevealed",
"link": "http://marvel.com/characters/1552/mystique",
"img": "https://dl.dropboxusercontent.com/u/19954023/marvel_force_chart_img/mystique.png",
"size": 40000,
"popularity": 8
},
{
"hero": "Red Skull",
"name": "Johann Shmidt",
"link": "http://marvel.com/characters/1901/red_skull",
"img": "https://dl.dropboxusercontent.com/u/19954023/marvel_force_chart_img/redskull.png",
"size": 40000,
"popularity": 9
},
{
"hero": "Ronan",
"name": "Ronan",
"link": "http://marvel.com/characters/49/ronan",
"img": "https://dl.dropboxusercontent.com/u/19954023/marvel_force_chart_img/ronan.png",
"size": 40000,
"popularity": 8
},
{
"hero": "Magneto",
"name": "Max Eisenhardt",
"link": "http://marvel.com/characters/35/magneto",
"img": "https://dl.dropboxusercontent.com/u/19954023/marvel_force_chart_img/magneto.png",
"size": 40000,
"popularity": 8
},
{
"hero": "Thanos",
"name": "Thanos",
"link": "http://marvel.com/characters/58/thanos",
"img": "https://dl.dropboxusercontent.com/u/19954023/marvel_force_chart_img/thanos.png",
"size": 40000,
"popularity": 7
},
{
"hero": "Black Cat",
"name": "Felicia Hardy",
"link": "http://marvel.com/characters/271/black_cat",
"img": "https://dl.dropboxusercontent.com/u/19954023/marvel_force_chart_img/blackcat.png",
"size": 40000,
"popularity": 6
}
]
},
{
"name": "Teams",
"children": [
{
"hero": "Avengers",
"name": "",
"link": "http://marvel.com/characters/68/avengers",
"img": "https://dl.dropboxusercontent.com/u/19954023/marvel_force_chart_img/avengers.png",
"size": 40000,
"popularity": 6
},
{
"hero": "Guardians of the Galaxy",
"name": "",
"link": "http://marvel.com/characters/70/guardians_of_the_galaxy",
"img": "https://dl.dropboxusercontent.com/u/19954023/marvel_force_chart_img/gofgalaxy.png",
"size": 40000,
"popularity": 5
},
{
"hero": "Defenders",
"name": "",
"link": "http://marvel.com/characters/534/defenders",
"img": "https://dl.dropboxusercontent.com/u/19954023/marvel_force_chart_img/defenders.png",
"size": 40000,
"popularity": 2
},
{
"hero": "X-Men",
"name": "",
"link": "http://marvel.com/characters/71/x-men",
"img": "https://dl.dropboxusercontent.com/u/19954023/marvel_force_chart_img/xmen.png",
"size": 40000,
"popularity": 3
},
{
"hero": "Fantastic Four",
"name": "",
"link": "http://marvel.com/characters/69/fantastic_four",
"img": "https://dl.dropboxusercontent.com/u/19954023/marvel_force_chart_img/fantasticfour.png",
"size": 40000,
"popularity": 3
},
{
"hero": "Inhumans",
"name": "",
"link": "http://marvel.com/characters/1040/inhumans",
"img": "https://dl.dropboxusercontent.com/u/19954023/marvel_force_chart_img/inhumans.png",
"size": 40000,
"popularity": 9
}
]
}
您可以使用d3.js的.filter()特性。将平面化的json记录存储在全局变量中。为"所有"answers"流行"按钮设置一个onclick侦听器。'popular'按钮的onclick监听器可以是这样的:
function filterPopular(){
tempNodes = nodes.filter(function(d){
return !('popularity' in d) || d.popularity>5;
});
update(tempNodes);
}
.filter()的本质是保留回调函数返回true的记录。在这种情况下，没有人气字段的记录(非叶节点)或人气大于5的记录将保留在tempNodes中。我将过滤的记录存储到一个新的变量中，以便在单击"所有"按钮时全局维护记录。使用tempNodes调用update。节点现在将消失，但从父节点到已删除的子节点的链接将保留。你必须想办法删除这些链接。希望这对你有所帮助!
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