将点击事件绑定到D3元素 [英] Bind click event to D3 element

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本文介绍了将点击事件绑定到D3元素的处理方法,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

下面的结果在方法 nodeClick()在页面加载时调用(不点击)。为什么?如何使得nodeClick()函数仅在我单击元素时触发?代码:

  var node = svg.selectAll(。node)
.on ());

 

var width = 960,
height = 500;

var color = d3.scale.category10();

var nodes = [],
links = [];

var force = d3.layout.force()
.nodes(nodes)
.links(links)
.charge(-400)
.linkDistance(120)
.size([width,height])
.on(tick,tick);

var svg = d3.select(body)append(svg)
.attr(width,width)
.attr高度);

var node = svg.selectAll(。node)
.on(click,nodeClick()),
link = svg.selectAll );

function start(){
link = link.data(force.links(),function(d){return d.source.id + - + d.target.id ;});
link.enter()。insert(line,.node)。attr(class,link);
link.exit()。remove();

node = node.data(force.nodes(),function(d){return d.id;});
node.enter()。append(circle)。attr(class,function(d){returnnode+ d.id;})attr(r,8)
node.exit()。remove();

force.start();
}

function nodeClick(){
console.log(ASDASDASD);
}

function tick(){
node.attr(cx,function(d){return dx;})
.attr ,function(d){return dy;})

link.attr(x1,function(d){return d.source.x;})
.attr ,function(d){return d.source.y;})
.attr(x2,function(d){return d.target.x;})
.attr ,function(d){return d.target.y;});
}


解决方案

函数,当您设置点击处理程序。你需要附加一个函数到处理程序,当调用时调用你实际想要的函数:

  .on ,function(){nodeClick()}); 

或等效地给出函数名称而不调用函数b

  .on(click,nodeClick) 


The following results in the method nodeClick() being called once upon page load (without clicking). Why? How do I make the nodeClick() function be triggered only when I click the element? Code:

var node = svg.selectAll(".node")
    .on("click", nodeClick());

in the contex

var width = 960,
   height = 500;

var color = d3.scale.category10();

var nodes = [],
    links = [];

var force = d3.layout.force()
    .nodes(nodes)
    .links(links)
    .charge(-400)
    .linkDistance(120)
    .size([width, height])
    .on("tick", tick);

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

var node = svg.selectAll(".node")
    .on("click", nodeClick()),
    link = svg.selectAll(".link");

function start() {
    link = link.data(force.links(), function(d) { return d.source.id + "-" + d.target.id; });
    link.enter().insert("line", ".node").attr("class", "link");
    link.exit().remove();

    node = node.data(force.nodes(), function(d) { return d.id;});
    node.enter().append("circle").attr("class", function(d) { return "node " + d.id; }).attr("r", 8);
    node.exit().remove();

    force.start();
}

function nodeClick() {
    console.log("ASDASDASD");
}

function tick() {
    node.attr("cx", function(d) { return d.x; })
        .attr("cy", function(d) { return d.y; })

    link.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; });
}

解决方案

You're actually calling the function when you're setting up the click handler. You need to attach a function to the handler that will call the function you actually want when called:

.on("click", function() { nodeClick() });

or equivalently give it the function name without calling the function (shorter)

.on("click", nodeClick);

这篇关于将点击事件绑定到D3元素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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