Javascript d3.js中的拖放操作期间不会触发鼠标悬停事件
我试图在另一个圆上拖动一个圆来连接两条路径。问题是,当我将一个圆(c2)拖到另一个圆(c1)上时,如果圆c1是在圆c2之前创建的,则不会触发c1鼠标悬停事件 你能帮我吗 谢谢!Javascript d3.js中的拖放操作期间不会触发鼠标悬停事件,javascript,d3.js,Javascript,D3.js,我试图在另一个圆上拖动一个圆来连接两条路径。问题是,当我将一个圆(c2)拖到另一个圆(c1)上时,如果圆c1是在圆c2之前创建的,则不会触发c1鼠标悬停事件 你能帮我吗 谢谢! 以前 我添加了一些代码,如果用户正在移动圆圈,如果他不打算创建一个新的圆圈,我希望这会有所帮助 var closedRoad = true; var width = 960, height = 500; var points = d3.range(1, 5).map(funct
以前 我添加了一些代码,如果用户正在移动圆圈,如果他不打算创建一个新的圆圈,我希望这会有所帮助
var closedRoad = true;
var width = 960,
height = 500;
var points = d3.range(1, 5).map(function(i) {
return [i * width / 5, 50 + Math.random() * (height - 100)];
});
var points1 = d3.range(1, 5).map(function(i) {
return [i * width / 5, 50 + Math.random() * (height - 100)];
});
var points2 = d3.range(1, 5).map(function(i) {
return [i * width / 5, 50 + Math.random() * (height - 100)];
});
var count = 0;
var ways = [];
var currentWay = null;
var selected = null;
var line = d3.svg.line();
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
var rect = svg.append("rect")
.attr("width", width)
.attr("height", height);
ways.forEach(function(way, i) {
svg.append("path")
.datum(way)
.attr("id", "p" + way.id)
.attr("class", "line")
.call(redraw);
});
d3.select(window)
.on("keydown", keydown)
//.on("mousemove", mousemove)
.on("mouseup", mouseup)
.on("mousedown", mousedown)
.on("dblclick", dblclick);
function redraw(way) {
way.attr("d", function(d) { return line(d.pts); });
var circle = svg.selectAll(".way" + way.data()[0].id)
.data(way.data()[0].pts, function(d) { return d; });
circle.enter().append("circle")
.attr("class", "way" + way.data()[0].id)
.attr("r", 1e-6)
.on("mousedown", function(d) {
if (closedRoad) {
currentWay = way.data()[0];
selected = d;
if (d3.event) {
d3.event.preventDefault();
d3.event.stopPropagation();
}
}
})
.on("mouseover", function() { d3.select(d3.event.target).classed("highlight", true); })
.on("mouseout", function() { d3.select(d3.event.target).classed("highlight", false); })
.transition()
.duration(750)
.ease("elastic")
.attr("r", 6.5);
circle
.attr("cx", function(d) { return d[0]; })
.attr("cy", function(d) { return d[1]; });
////
var drag = d3.behavior.drag();
drag.on("dragstart", function(d) {
console.log('START');
})
.on("drag", function(d) {
console.log('MOVE');
var m = d3.mouse(svg.node());
d[0] = Math.max(0, Math.min(width, m[0]));
d[1] = Math.max(0, Math.min(height, m[1]));
//redraw(way);
redrawAll();
})
.on("dragend", function(d) {
console.log('END');
});
circle.call(drag);
////
circle.exit().remove();
/* if (d3.event) {
d3.event.preventDefault();
d3.event.stopPropagation();
}*/
}
function dblclick() {
currentWay.pts.pop();
//redraw(svg.select("#p" + currentWay.id));
redrawAll();
closedRoad = true;
}
function mousedown() {
start = event.pageX + event.pageY;
console.log(start);
}
function mouseup(){
if(start >= (event.pageX + event.pageY) - 10 && start <= (event.pageX + event.pageY) + 10){
if (closedRoad) {
currentWay = { id: ++count, pts: [] };
ways.push(currentWay);
svg.append("path")
.datum(currentWay)
.attr("id", "p" + currentWay.id)
.attr("class", "line")
.on("mouseover", function() {
d3.select(d3.event.target).classed("highlight", true);
})
.on("mouseout", function() { d3.select(d3.event.target).classed("highlight", false); })
.call(redraw);
closedRoad = false;
}
currentWay.pts.push(selected = d3.mouse(svg.node()));
//redraw(svg.select("#p" + currentWay.id));
redrawAll();
}else{
closedRoad = true;
}
}
function redrawAll() {
ways.forEach(function(way, i) {
redraw(svg.select("#p" + way.id));
});
}
function mousemove() {
}
function keydown() {
if (!selected) return;
switch (d3.event.keyCode) {
case 8: // backspace
case 46: { // delete
var i = currentWay.pts.indexOf(selected);
currentWay.pts.splice(i, 1);
selected = currentWay.pts.length ? currentWay.pts[i > 0 ? i - 1 : 0] : null;
redraw(svg.select("#p" + currentWay.id));
break;
}
}
}
var closedRoad=true;
可变宽度=960,
高度=500;
变量点=d3.范围(1,5).映射(函数(i){
返回[i*宽度/5,50+数学随机()*(高度-100)];
});
变量点1=d3.范围(1,5).映射(函数(i){
返回[i*宽度/5,50+数学随机()*(高度-100)];
});
var points2=d3.范围(1,5).映射(函数(i){
返回[i*宽度/5,50+数学随机()*(高度-100)];
});
var计数=0;
var方法=[];
var currentWay=null;
选择的var=null;
var line=d3.svg.line();
var svg=d3.选择(“正文”).追加(“svg”)
.attr(“宽度”,宽度)
.attr(“高度”,高度);
var rect=svg.append(“rect”)
.attr(“宽度”,宽度)
.attr(“高度”,高度);
方法。forEach(函数(方法,i){
追加(“路径”)
.基准(道路)
.attr(“id”,“p”+路径id)
.attr(“类”、“行”)
.呼叫(重画);
});
d3.选择(窗口)
.on(“按键向下”,按键向下)
//.on(“mousemove”,mousemove)
.on(“mouseup”,mouseup)
.on(“mousedown”,mousedown)
.on(“dblclick”,dblclick);
函数重绘(方式){
attr(“d”,函数(d){returnline(d.pts);});
var circle=svg.selectAll(“.way”+way.data()[0].id)
.data(way.data()[0].pts,函数(d){return d;});
circle.enter().append(“circle”)
.attr(“类”、“方式”+way.data()[0].id)
.attr(“r”,1e-6)
.on(“mousedown”,函数(d){
if(closedRoad){
currentWay=way.data()[0];
所选=d;
if(d3.事件){
d3.event.preventDefault();
d3.event.stopPropagation();
}
}
})
.on(“mouseover”,function(){d3.select(d3.event.target).classed(“highlight”,true);})
.on(“mouseout”,function(){d3.select(d3.event.target).classed(“highlight”,false);})
.transition()
.持续时间(750)
.ease(“弹性”)
.attr(“r”,6.5);
圆圈
.attr(“cx”,函数(d){返回d[0];})
.attr(“cy”,函数(d){返回d[1];});
////
var drag=d3.behavior.drag();
drag.on(“dragstart”,函数(d){
console.log('START');
})
.开启(“拖动”,功能(d){
console.log('MOVE');
var m=d3.mouse(svg.node());
d[0]=数学最大值(0,数学最小值(宽度,m[0]);
d[1]=数学最大值(0,数学最小值(高度,m[1]);
//重画(道路);
重画();
})
.on(“dragend”,功能(d){
console.log('END');
});
圆圈。呼叫(拖动);
////
circle.exit().remove();
/*if(d3.事件){
d3.event.preventDefault();
d3.event.stopPropagation();
}*/
}
函数dblclick(){
currentWay.pts.pop();
//重画(svg.select(“#p”+currentWay.id));
重画();
closedRoad=true;
}
函数mousedown(){
开始=event.pageX+event.pageY;
console.log(启动);
}
函数mouseup(){
如果(开始>=(event.pageX+event.pageY)-10&&start 0?i-1:0]:空;
重画(svg.select(“#p”+currentWay.id));
打破
}
}
}
问题很简单,当两个元素相互重叠时,“mouseover”事件只会在最顶端的元素上触发。无论您是否处理最顶端元素的鼠标事件,这都是正确的。更改该行为将需要大量的变通工作,而这些工作都不需要这些都是理想的
一些可能的解决办法:
- 在拖动功能中,反复检查此处是否有另一个圆 您可以使用此方法查找给定矩形中的所有元素。请注意,此方法是在SVG节点上调用的,而不是在d3选择上调用的
- 拖动节点时,通过在其上设置样式
,使其对鼠标事件“透明” 当然,这也将使其对拖动事件透明,因此您必须将拖动事件添加到容器而不是节点,然后确定在“dragstart”事件中拖动的是哪个圆,更改其指针事件样式,并将圆选择存储在指针事件:无;
拖动
函数可访问的变量中(移动时与当前代码相同)和
函数(将重新设置指针事件样式)。您还需要向指定拖动行为的dragend
或
元素添加背景矩形,以便即使鼠标仅在“透明”上,它也会响应鼠标事件圈 - 拖动节点时,将其移动到绘制顺序的底部,以便在顶部绘制所有其他节点
由于SVG不像HTML那样具有“z-index”属性,因此实现这一点的唯一方法是使用或纯Javascript
对DOM进行重新排序insertBefore()
- 或者,承认这只是一个小小的美学缺陷,不会改变代码的功能,因此不值得上述方法带来麻烦和性能影响
如果您不喜欢某些圆在拖动时会改变颜色,可以在svg上为
var closedRoad = true; var width = 960, height = 500; var points = d3.range(1, 5).map(function(i) { return [i * width / 5, 50 + Math.random() * (height - 100)]; }); var points1 = d3.range(1, 5).map(function(i) { return [i * width / 5, 50 + Math.random() * (height - 100)]; }); var points2 = d3.range(1, 5).map(function(i) { return [i * width / 5, 50 + Math.random() * (height - 100)]; }); var count = 0; var ways = []; var currentWay = null; var selected = null; var line = d3.svg.line(); var svg = d3.select("body").append("svg") .attr("width", width) .attr("height", height); var rect = svg.append("rect") .attr("width", width) .attr("height", height); ways.forEach(function(way, i) { svg.append("path") .datum(way) .attr("id", "p" + way.id) .attr("class", "line") .call(redraw); }); d3.select(window) .on("keydown", keydown) //.on("mousemove", mousemove) .on("mouseup", mouseup) .on("mousedown", mousedown) .on("dblclick", dblclick); function redraw(way) { way.attr("d", function(d) { return line(d.pts); }); var circle = svg.selectAll(".way" + way.data()[0].id) .data(way.data()[0].pts, function(d) { return d; }); circle.enter().append("circle") .attr("class", "way" + way.data()[0].id) .attr("r", 1e-6) .on("mousedown", function(d) { if (closedRoad) { currentWay = way.data()[0]; selected = d; if (d3.event) { d3.event.preventDefault(); d3.event.stopPropagation(); } } }) .on("mouseover", function() { d3.select(d3.event.target).classed("highlight", true); }) .on("mouseout", function() { d3.select(d3.event.target).classed("highlight", false); }) .transition() .duration(750) .ease("elastic") .attr("r", 6.5); circle .attr("cx", function(d) { return d[0]; }) .attr("cy", function(d) { return d[1]; }); //// var drag = d3.behavior.drag(); drag.on("dragstart", function(d) { console.log('START'); }) .on("drag", function(d) { console.log('MOVE'); var m = d3.mouse(svg.node()); d[0] = Math.max(0, Math.min(width, m[0])); d[1] = Math.max(0, Math.min(height, m[1])); //redraw(way); redrawAll(); }) .on("dragend", function(d) { console.log('END'); }); circle.call(drag); //// circle.exit().remove(); /* if (d3.event) { d3.event.preventDefault(); d3.event.stopPropagation(); }*/ } function dblclick() { currentWay.pts.pop(); //redraw(svg.select("#p" + currentWay.id)); redrawAll(); closedRoad = true; } function mousedown() { start = event.pageX + event.pageY; console.log(start); } function mouseup(){ if(start >= (event.pageX + event.pageY) - 10 && start <= (event.pageX + event.pageY) + 10){ if (closedRoad) { currentWay = { id: ++count, pts: [] }; ways.push(currentWay); svg.append("path") .datum(currentWay) .attr("id", "p" + currentWay.id) .attr("class", "line") .on("mouseover", function() { d3.select(d3.event.target).classed("highlight", true); }) .on("mouseout", function() { d3.select(d3.event.target).classed("highlight", false); }) .call(redraw); closedRoad = false; } currentWay.pts.push(selected = d3.mouse(svg.node())); //redraw(svg.select("#p" + currentWay.id)); redrawAll(); }else{ closedRoad = true; } } function redrawAll() { ways.forEach(function(way, i) { redraw(svg.select("#p" + way.id)); }); } function mousemove() { } function keydown() { if (!selected) return; switch (d3.event.keyCode) { case 8: // backspace case 46: { // delete var i = currentWay.pts.indexOf(selected); currentWay.pts.splice(i, 1); selected = currentWay.pts.length ? currentWay.pts[i > 0 ? i - 1 : 0] : null; redraw(svg.select("#p" + currentWay.id)); break; } } }