如何将事件侦听器添加到svg中的对象? [英] How to add event listeners to objects in a svg?
问题描述
我想创建一个显示交互式svg的网页:因为可以使用多个svg,所显示的各种对象将具有不同的ID,因此事件监听器(例如捕捉鼠标点击)必须是动态的。
从这段代码
var a = document.getElementById(alphasvg);
a.addEventListener(load,function(){
var svgDoc = a.contentDocument;
var delta = svgDoc.getElementById(delta);
delta.addEventListener (click,function(){alert('hello world!')},false);
},false);
我想找到一种方法来遍历svg的所有对象(可能有一个特定的class),并附加一个监听器。
update 所以JQuery 'each'函数可能是一个合适的选项,但似乎JQuery不能很好地处理svg DOM。有没有其他可用的选项? (像一个JQuery插件?)
这是我的首选结构,用于将事件监听器添加到带有香草js的SVG元素中。
//选择元素
var elements = Array.from(document.querySelectorAll('svg .selector')) ;
//添加事件监听器
elements.forEach(function(el){
el.addEventListener(touchstart,start);
el.addEventListener( mousedown,start);
el.addEventListener(touchmove,move);
el.addEventListener(mousemove,move);
})
//事件监听器函数
函数start(e){
console.log(e);
//只是一个例子
}
函数move(e){
console.log(e);
//只是一个示例
}
您提供的示例代码有点但是这里有一个重写,它使它工作...
var a = document.getElementById(alphasvg);
a.addEventListener(load,function(){
var svgDoc = a.contentDocument;
var els = svgDoc.querySelectorAll(。myclass);
for var i = 0,length = els.length; i< length; i ++){
els [i] .addEventListener(click,
function(){console.log(clicked)) ;
},false);
}
},false);
I would like to create a web page displaying an interactive svg: since several svg may be used, the various objects displayed will have different IDs, so the event listeners (to catch a mouse click, for example) have to be dynamic.
Starting from this snippet
var a = document.getElementById("alphasvg");
a.addEventListener("load",function(){
var svgDoc = a.contentDocument;
var delta = svgDoc.getElementById("delta");
delta.addEventListener("click",function(){alert('hello world!')},false);
},false);
I would like to find a way to cycle through all the objects of the svg (maybe having a particular class) and attach an even listener to them.
update
So JQuery 'each' function may be a suitable option, but it seems that JQuery doesn't handle the svg DOM so well. Is there any other available option? (like a JQuery plugin?)
This is my preferred structure for adding event listeners to SVG elements with vanilla js...
// select elements
var elements = Array.from(document.querySelectorAll('svg .selector'));
// add event listeners
elements.forEach(function(el) {
el.addEventListener("touchstart", start);
el.addEventListener("mousedown", start);
el.addEventListener("touchmove", move);
el.addEventListener("mousemove", move);
})
// event listener functions
function start(e){
console.log(e);
// just an example
}
function move(e){
console.log(e);
// just an example
}
The sample code you present is somewhat contrived, but here's a rewrite that makes it work...
var a = document.getElementById("alphasvg");
a.addEventListener("load",function(){
var svgDoc = a.contentDocument;
var els = svgDoc.querySelectorAll(".myclass");
for (var i = 0, length = els.length; i < length; i++) {
els[i].addEventListener("click",
function(){ console.log("clicked");
}, false);
}
},false);
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