javascript-如何在基于d3力的布局中在节点标签内的文本下划线？
作者：互联网
我正在使用基于d3力的图,该图的节点标签实际上是URL,单击该URL会将用户带到目标URL.出于可用性的原因,是否可以在网址下划线？更好的是,当用户将鼠标悬停在某个标签上时,下划线是否可以显示和消失,文本的颜色是否可以更改？这将帮助用户了解标签是可单击的.请帮忙.
document.addEventListener('DOMContentLoaded', function () {
drawVisual();
});
var QueuedORG = [];
var tempLIST = [];
function drawVisual()
{
//alert(sessionStorage["queuedArray"]);
/*var getArr = [];
getArr = JSON.parse(localStorage.getItem('storeArray'));
document.getElementById('myMSG').innerHTML = getArr[1].parentURL;*/
QueuedORG.length = 0;
tempLIST.length = 0;
//var w = 1024, h = 768;
var w=window.innerWidth
|| document.documentElement.clientWidth
|| document.body.clientWidth;
var h=window.innerHeight
|| document.documentElement.clientHeight
|| document.body.clientHeight;
//var w = 1024, h = 768;
//var vis = d3.select("#tab_5_contents").append("svg:svg").attr("width", w).attr("height", h);
var vis = d3.select("#forcedLayoutGraph").append("svg:svg").attr("width", w).attr("height", h);
//get links from LocalStorage
//QueuedORG = JSON.parse(sessionStorage.getItem("queuedArray"));
//QueuedORG = JSON.parse(localStorage["queuedArray"]);
QueuedORG.push({url: "http://understandblue.blogspot.com/", parentURL: "http://understandblue.blogspot.com", used:0});
QueuedORG.push({url: "http://www.google.com", parentURL: "http://understandblue.blogspot.com/", used:0});
QueuedORG.push({url: "http://paperfriendly.blogspot.com", parentURL: "http://understandblue.blogspot.com/", used:0});
QueuedORG.push({url: "http://4pawsforever.org", parentURL: "http://understandblue.blogspot.com/", used:0});
QueuedORG.push({url: "http://en.wikipedia.org", parentURL: "http://understandblue.blogspot.com/", used:0});
var nodes = [];
nodes.length = 0;
var labelAnchors = [];
labelAnchors.length = 0;
var labelAnchorLinks = [];
labelAnchorLinks.length = 0;
var links = [];
links.length = 0;
for(var i = 0; i < QueuedORG.length; i++)
{
var nodeExists = 0;
//check to see if a node for the current url has already been created. If yes, do not create a new node
for(var j = 0; j < nodes.length; j++)
{
if(QueuedORG[i].url == nodes[j].label)
nodeExists = 1;
}
if (nodeExists == 0)
{
var urlLabel = QueuedORG[i].url;
//remove 'http://' part
/*urlLabel = urlLabel.split("http://")[1];
if(urlLabel.match("www"))
urlLabel = urlLabel.split("www.")[1];
var rest = urlLabel.split("\.")[1];
urlLabel = urlLabel.split("\.")[0];*/
var node = {
label : QueuedORG[i].url,
category : QueuedORG[i].category
};
nodes.push(node);
labelAnchors.push({
node : node
});
labelAnchors.push({
node : node
});
}
};
/*for(var i=0;i<nodes.length; i++)
{
console.log("node i:"+i+nodes[i]+"\n");
console.log("labelAnchor i:"+i+labelAnchors[i]+"\n");
}*/
//To create links for connecting nodes
for(var i = 0; i < QueuedORG.length; i++)
{
var srcIndx = 0, tgtIndx = 0;
for(var j = 0; j < nodes.length; j++)
{
if( QueuedORG[i].url == nodes[j].label ) //to find the node number for the current url
{
srcIndx = j;
}
if( QueuedORG[i].parentURL == nodes[j].label ) //to find the node number for the parent url
{
tgtIndx = j;
}
}
//console.log("src:"+srcIndx+" tgt:"+tgtIndx);
//connecting the current url's node to the parent url's node
links.push({
source : srcIndx,
target : tgtIndx,
weight : 1,
});
labelAnchorLinks.push({
source : srcIndx * 2,
target : srcIndx * 2 + 1,
weight : 1
});
};
var force = d3.layout.force().size([w, h]).nodes(nodes).links(links).gravity(1).charge(-10000).linkStrength(function(x) {
return x.weight * 10 // charge is for inter-node repel, link distance is node-node distance
});
force.linkDistance(function(d) {
return d.weight * 100;
});
force.start();
var force2 = d3.layout.force().nodes(labelAnchors).links(labelAnchorLinks).gravity(0).linkStrength(10).charge(-500).size([w, h]); //charge is for inter-label repel, link distance is node-label distance
force2.linkDistance(function(d) {
return d.weight * 10;
});
force2.start();
var link = vis.selectAll("line.link").data(links).enter().append("svg:line").attr("class", "link").style("stroke", "#CCC");
var colors = {"1": "black", "2": "blue", "3": "red"}; // 1=root node 2=blog nodes 3=.org nodes
var shape = {"1": "diamond", "2": "cross", "3": "circle"};
var node = vis.selectAll("g.node").data(force.nodes()).enter().append("path").attr("class", "node").call(force.drag);
//node.append("circle").attr("r", 5).style("stroke", "#FFF").style("stroke-width", 3).attr("class", function(d) {return "node category"+d.category});
node.attr("d", d3.svg.symbol().type(function(d) {return shape[d.category];})).style("stroke", "#FFF").style("fill", function(d){ return colors[d.category];}).on('click', function(d, i) {
var win = window.open(d.node.label, '_blank);
win.focus();
});
var anchorLink = vis.selectAll("line.anchorLink").data(labelAnchorLinks)//.enter().append("svg:line").attr("class", "anchorLink").style("stroke", "#999");
var anchorNode = vis.selectAll("g.anchorNode").data(force2.nodes()).enter().append("svg:g").attr("class", "anchorNode").on('click', function(d, i){
var win = window.open(d.node.label, '_blank);
win.focus();
});
anchorNode.append("svg:circle").attr("r", 0).style("fill", "#FFF");
anchorNode.append("svg:text").text(function(d, i) {
return i % 2 == 0 ? "" : d.node.label
}).style("fill", "#555").style("font-family", "Arial").style("font-size", 12);
var updateLink = function() {
this.attr("x1", function(d) {
return d.source.x;
}).attr("y1", function(d) {
return d.source.y;
}).attr("x2", function(d) {
return d.target.x;
}).attr("y2", function(d) {
return d.target.y;
});
}
var updateNode = function() {
this.attr("transform", function(d) {
return "translate(" + d.x + "," + d.y + ")";
});
}
force.on("tick", function() {
force2.start();
node.call(updateNode);
anchorNode.each(function(d, i) {
if(i % 2 == 0) {
d.x = d.node.x;
d.y = d.node.y;
} else {
var b = this.childNodes[1].getBBox();
var diffX = d.x - d.node.x;
var diffY = d.y - d.node.y;
var dist = Math.sqrt(diffX * diffX + diffY * diffY);
var shiftX = b.width * (diffX - dist) / (dist * 2);
shiftX = Math.max(-b.width, Math.min(0, shiftX));
var shiftY = 5;
this.childNodes[1].setAttribute("transform", "translate(" + shiftX + "," + shiftY + ")");
}
});
anchorNode.call(updateNode);
link.call(updateLink);
anchorLink.call(updateLink);
});
}
解决方法:
正如Matt Walters所说,您可以更改文本颜色并使用CSS添加下划线,包括添加悬停效果.
但是,我强烈建议您将链接实现为实际的< a>元素超链接,它是perfectly acceptable in SVG.我已经对其进行了测试,您可以将text元素包装在链接中,也可以将链接放在text元素中,但要包围实际的文本内容.唯一的麻烦是,您必须将xlink：href用作url属性,而不是简单的href.
这是我为其他人的调试创建的力导向图,适用于将所有文本标签转换为链接：
http://codepen.io/AmeliaBR/pen/AoFHg
更新功能中的关键代码：
hypertext = hypertext.data(force.nodes());
// hypertext refers to a selection of text elements, joined to the data
// Add labels for new nodes:
hypertext.enter().append("text") //add the text element
//add any unchanging attributes of the <text>:
.attr("text-anchor", "middle")
//add a link element within each text element
.append("a")
//add unchanging attributes of the <a> link
.attr("target", "_blank") //set the link to open in an unnamed tab
.attr("xlink:show", "new");
//show="new" is an XML way to tell the link to open in a new tab/window.
//Either attribute *should* work on its own, but best use both to be safe.
// At this point, each new <text> element contains an <a> element, but the
// variable hypertext still refers to the text elements.
// Remove any outgoing/old text elements for non-existent nodes:
hypertext.exit().remove();
// Compute data-based attributes for entering and updating texts:
hypertext.attr("x", 8) //attributes of the <text> elements
.attr("y", "0.3em")
//Select the existing <a> element within each <text>
.select("a")
//Update the link attributes. Note that the <a> element was never given
//its own data, so it inherits the data from the parent <text> element.
.attr("xlink:href", function (d) {
return "http://example.com/" + d.name; //create url from data
})
//Set the text within the link, which in this case is the only text
//within the text element.
.text(function (d) {
return d.name; //link text content
});
使用link元素创建了所有必要的功能,但是没有添加默认的HTML链接样式.为此,有CSS：
text a {
fill: navy;
}
text a:visited {
fill:darkpurple;
}
text a:hover, text a:active {
text-decoration: underline;
fill:darkred;
}
标签：labels,d3-js,force-layout,css,javascript 来源： https://codeday.me/bug/20191030/1964134.html