单击带有 D3.js 的元素后防止鼠标移出操作

Question

我想阻止用户单击元素时鼠标移开该元素的操作。例如，请参阅此 JSFiddle（即使我单击标签，圆圈也会消失）。

有没有一种简单的方法可以用 d3.js 实现我的 objective？谢谢！

JSFiddle 示例代码：

var svg = d3.select("#content")
                        .append("svg")
            .attr("width", 600)
            .attr("height", 400);
var g = svg.append("g");
var text = g.append("text")
                            .text("Click me")
              .style("fill", "Blue")
              .attr("x", 50)
              .attr("y", 50)
              .on("mouseover", mouseover)
              .on("mouseout", mouseout)
              .on("click", click);

var circle = g.append("circle")
                                .style("fill", "Orange")
                .attr("cx", 150)
                .attr("cy", 90)
                .attr("r", 15)
                .classed("hide", true)
                .classed("someClass", true);

function mouseover(p){
    d3.selectAll("circle.someClass").classed("hide", false);
}
function mouseout(p){
    d3.selectAll("circle.someClass").classed("hide", true);
}
function click(p){
    d3.selectAll("circle.someClass").classed("hide", false);
}

Answer 1

如果您打算只有一个元素控制圆圈，请使用 "flag"。有条件地处理 registering/unregistering 事件不是一个好主意。

检查您 fiddle 的更新版本：

https://jsfiddle.net/cze9rqf7/

var svg = d3.select("#content")
          .append("svg")
          .attr("width", 600)
          .attr("height", 400);
var g = svg.append("g");
var text = g.append("text")
          .text("Click me")
          .style("fill", "Blue")
          .attr("x", 50)
          .attr("y", 50)
          .on("mouseover", mouseover)
          .on("mouseout", mouseout)
          .on("click", click);

var circle = g.append("circle")
          .style("fill", "Orange")
          .attr("cx", 150)
          .attr("cy", 90)
          .attr("r", 15)
          .classed("hide", true)
          .classed("someClass", true);

var isClicked = false;

function mouseover(p){
    d3.selectAll("circle.someClass").classed("hide", false);
}

function mouseout(p){
    if(!isClicked) {
        d3.selectAll("circle.someClass").classed("hide", true);
    }
}

function click(p){
    isClicked = !isClicked;
    d3.selectAll("circle.someClass").classed("hide", false);
}

编辑评论

如果您需要 "remember" 每个元素的状态，而不是使用全局，您应该在这些元素上使用数据绑定：

var text = g.append("text")
  .datum({isClicked: false})
  .text("Click me")
  ...

function mouseout(p){
    // p is the data-bound object
    if(!p.isClicked) {
        var className = d3.select(this).attr("class");
        d3.selectAll("circle."+className).classed("hide", true);
  }
}

function click(p){
    // on click edit the data-bound object
    p.isClicked = !p.isClicked;
    var className = d3.select(this).attr("class");
    d3.selectAll("circle."+className).classed("hide", false);
}

已更新 fiddle here。

Answer 2

这是一个没有任何答案的答案 "flag":

鉴于您有很多标签，一种选择是删除所点击元素的 mouseout：

d3.select(this).on("mouseout", null);

这是您更新后的 fiddle：https://jsfiddle.net/gerardofurtado/38p18pLt/

Stack 片段中的相同代码：

var svg = d3.select("body")
  .append("svg")
  .attr("width", 600)
  .attr("height", 400);
var g = svg.append("g");
var text = g.append("text")
  .text("Click me")
  .style("fill", "Blue")
  .attr("x", 50)
  .attr("y", 50)
  .classed("someClass", true)
  .on("mouseover", mouseover)
  .on("mouseout", mouseout)
  .on("click", click);

var text2 = g.append("text")
  .text("Click me")
  .style("fill", "Blue")
  .attr("x", 50)
  .attr("y", 150)
  .classed("someClass2", true)
  .on("mouseover", mouseover)
  .on("mouseout", mouseout)
  .on("click", click);

var circle = g.append("circle")
  .style("fill", "Orange")
  .attr("cx", 150)
  .attr("cy", 90)
  .attr("r", 15)
  .classed("hide", true)
  .classed("someClass", true);

var circle2 = g.append("circle")
  .style("fill", "Green")
  .attr("cx", 250)
  .attr("cy", 90)
  .attr("r", 15)
  .classed("hide", true)
  .classed("someClass2", true);

function mouseover(p) {
  var className = d3.select(this).attr("class");
  d3.selectAll("circle." + className).classed("hide", false);
}

function mouseout(p) {
  var className = d3.select(this).attr("class");
  d3.selectAll("circle." + className).classed("hide", true);
}

function click(p) {
  d3.select(this).on("mouseout", null);
  var className = d3.select(this).attr("class");
  d3.selectAll("circle." + className).classed("hide", false);
}

.hide {
  display: none;
}

text {
  cursor: pointer;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>

您还可以切换点击，使 mouseout 再次工作：

if(d3.select(this)[0][0].__onmouseout){
    d3.select(this).on("mouseout", null);
} else {
    d3.select(this).on("mouseout", mouseout);
}

这里是 fiddle 和 "toggle" 函数：https://jsfiddle.net/gerardofurtado/4zb9gL9r/1/

Stack 片段中的相同代码：

var svg = d3.select("body")
  .append("svg")
  .attr("width", 600)
  .attr("height", 400);
var g = svg.append("g");
var text = g.append("text")
  .text("Click me")
  .style("fill", "Blue")
  .attr("x", 50)
  .attr("y", 50)
  .classed("someClass", true)
  .on("mouseover", mouseover)
  .on("mouseout", mouseout)
  .on("click", click);

var text2 = g.append("text")
  .text("Click me")
  .style("fill", "Blue")
  .attr("x", 50)
  .attr("y", 150)
  .classed("someClass2", true)
  .on("mouseover", mouseover)
  .on("mouseout", mouseout)
  .on("click", click);

var circle = g.append("circle")
  .style("fill", "Orange")
  .attr("cx", 150)
  .attr("cy", 90)
  .attr("r", 15)
  .classed("hide", true)
  .classed("someClass", true);

var circle2 = g.append("circle")
  .style("fill", "Green")
  .attr("cx", 250)
  .attr("cy", 90)
  .attr("r", 15)
  .classed("hide", true)
  .classed("someClass2", true);

function mouseover(p) {
  var className = d3.select(this).attr("class");
  d3.selectAll("circle." + className).classed("hide", false);
}

function mouseout(p) {
  var className = d3.select(this).attr("class");
  d3.selectAll("circle." + className).classed("hide", true);
}

function click(p) {
  if (d3.select(this)[0][0].__onmouseout) {
    d3.select(this).on("mouseout", null);
  } else {
    d3.select(this).on("mouseout", mouseout);
  }
  var className = d3.select(this).attr("class");
  d3.selectAll("circle." + className).classed("hide", false);
}

.hide {
  display: none;
}

text {
  cursor: pointer;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>

单击带有 D3.js 的元素后防止鼠标移出操作

Prevent mouseout action after click on an element with D3.js

javascript

svg

onclick

mouseout

d3.js