JSON.stringify(eventObject);
返回:
TypeError: 将循环结构转换为JSON
dojox.json.ref.toJson(eventObject);
返回:
TypeError: 访问无法有选择的输入元素上的selectionEnd。
是否有一些库/代码可以直接使用来实现它?
JSON.stringify(eventObject);
返回:
TypeError: 将循环结构转换为JSON
dojox.json.ref.toJson(eventObject);
返回:
TypeError: 访问无法有选择的输入元素上的selectionEnd。
是否有一些库/代码可以直接使用来实现它?
使用JSON.stringify无法序列化事件对象,因为事件对象包含对DOM节点的引用,而DOM中存在各种循环引用(例如父/子关系)。默认情况下,JSON无法处理这些引用,所以您需要另寻他路。
我建议您查看如何将DOM节点序列化为JSON,即使存在循环引用?,其中提供了一些关于如何序列化DOM节点的建议。此外,以下问题似乎包含有用信息:
能够处理循环引用的JSON库包括:
或者,如果您不需要它们,您可以删除所有对DOM节点的引用,然后序列化对象。您不应该这样做。请参阅@PointedEars评论 :)
JSON.stringify(evt, function(k, v) {
if (v instanceof Node) {
return 'Node';
}
if (v instanceof Window) {
return 'Window';
}
return v;
}, ' ');
更新2019年:浏览器API已有一定改变,这里提供了一种方法来暴露事件原型链中所有可用的键。
function stringifyEvent(e) {
const obj = {};
for (let k in e) {
obj[k] = e[k];
}
return JSON.stringify(obj, (k, v) => {
if (v instanceof Node) return 'Node';
if (v instanceof Window) return 'Window';
return v;
}, ' ');
}
MouseEvent
的 {isTrusted: true}
。 - Blightbuster我曾经遇到过类似问题,并编写了一个简单的事件序列化程序,同时还编写了一个帮助方法来清理事件的路径属性。这个解决方案的处理方式是将数据从事件对象转换为可序列化的对象:
// Calculate a string representation of a node's DOM path.
var pathToSelector = function(node) {
if (!node || !node.outerHTML) {
return null;
}
var path;
while (node.parentElement) {
var name = node.localName;
if (!name) break;
name = name.toLowerCase();
var parent = node.parentElement;
var domSiblings = [];
if (parent.children && parent.children.length > 0) {
for (var i = 0; i < parent.children.length; i++) {
var sibling = parent.children[i];
if (sibling.localName && sibling.localName.toLowerCase) {
if (sibling.localName.toLowerCase() === name) {
domSiblings.push(sibling);
}
}
}
}
if (domSiblings.length > 1) {
name += ':eq(' + domSiblings.indexOf(node) + ')';
}
path = name + (path ? '>' + path : '');
node = parent;
}
return path;
};
// Generate a JSON version of the event.
var serializeEvent = function(e) {
if (e) {
var o = {
eventName: e.toString(),
altKey: e.altKey,
bubbles: e.bubbles,
button: e.button,
buttons: e.buttons,
cancelBubble: e.cancelBubble,
cancelable: e.cancelable,
clientX: e.clientX,
clientY: e.clientY,
composed: e.composed,
ctrlKey: e.ctrlKey,
currentTarget: e.currentTarget ? e.currentTarget.outerHTML : null,
defaultPrevented: e.defaultPrevented,
detail: e.detail,
eventPhase: e.eventPhase,
fromElement: e.fromElement ? e.fromElement.outerHTML : null,
isTrusted: e.isTrusted,
layerX: e.layerX,
layerY: e.layerY,
metaKey: e.metaKey,
movementX: e.movementX,
movementY: e.movementY,
offsetX: e.offsetX,
offsetY: e.offsetY,
pageX: e.pageX,
pageY: e.pageY,
path: pathToSelector(e.path && e.path.length ? e.path[0] : null),
relatedTarget: e.relatedTarget ? e.relatedTarget.outerHTML : null,
returnValue: e.returnValue,
screenX: e.screenX,
screenY: e.screenY,
shiftKey: e.shiftKey,
sourceCapabilities: e.sourceCapabilities ? e.sourceCapabilities.toString() : null,
target: e.target ? e.target.outerHTML : null,
timeStamp: e.timeStamp,
toElement: e.toElement ? e.toElement.outerHTML : null,
type: e.type,
view: e.view ? e.view.toString() : null,
which: e.which,
x: e.x,
y: e.y
};
console.log(JSON.stringify(o, null, 2));
}
};
// Create a mock event for this example
var evt = new MouseEvent("click", {
bubbles: true,
cancelable: true,
view: window
});
var cb = document.getElementById("clicker");
// Add a click listener
cb.addEventListener("click", serializeEvent);
// Fire the event
cb.dispatchEvent(evt);
<div>
<button id="clicker" /> JSONify my click!
</div>
o.eventName
进行字符串操作,将 o.view
替换为一个对象(通常是 window
),并通过解析 o.target
来获取目标元素,例如请参见此处。 - npetrov937这是由Alexander Shutau提供的代码的升级版,因为它处理多层对象(ES6):
function stringify_object(object, depth=0, max_depth=2) {
// change max_depth to see more levels, for a touch event, 2 is good
if (depth > max_depth)
return 'Object';
const obj = {};
for (let key in object) {
let value = object[key];
if (value instanceof Node)
// specify which properties you want to see from the node
value = {id: value.id};
else if (value instanceof Window)
value = 'Window';
else if (value instanceof Object)
value = stringify_object(value, depth+1, max_depth);
obj[key] = value;
}
return depth? obj: JSON.stringify(obj);
}
只需像这样调用:
stringify_object(event, 2);
touchstart : {"isTrusted":true,"touches":{"0":{"identifier":0,"target":{"id":"screen"},"screenX":548,"screenY":281.5,"clientX":498.1817932128906,"clientY":185.90908813476562,"pageX":498.1817932128906,"pageY":185.90908813476562,"radiusX":29.77272605895996,"radiusY":27.954544067382812,"rotationAngle":0,"force":0.5},"length":1,"item":{}},"targetTouches":{"0":{"identifier":0,"target":{"id":"screen"},"screenX":548,"screenY":281.5,"clientX":498.1817932128906,"clientY":185.90908813476562,"pageX":498.1817932128906,"pageY":185.90908813476562,"radiusX":29.77272605895996,"radiusY":27.954544067382812,"rotationAngle":0,"force":0.5},"length":1,"item":{}},"changedTouches":{"0":{"identifier":0,"target":{"id":"screen"},"screenX":548,"screenY":281.5,"clientX":498.1817932128906,"clientY":185.90908813476562,"pageX":498.1817932128906,"pageY":185.90908813476562,"radiusX":29.77272605895996,"radiusY":27.954544067382812,"rotationAngle":0,"force":0.5},"length":1,"item":{}},"altKey":false,"metaKey":false,"ctrlKey":false,"shiftKey":false,"view":"Window","detail":0,"sourceCapabilities":{"firesTouchEvents":true},"which":0,"initUIEvent":{},"NONE":0,"CAPTURING_PHASE":1,"AT_TARGET":2,"BUBBLING_PHASE":3,"type":"touchstart","target":{"id":"screen"},"currentTarget":{"id":"screen"},"eventPhase":2,"bubbles":true,"cancelable":true,"defaultPrevented":false,"composed":true,"timeStamp":192516.7899999651,"srcElement":{"id":"screen"},"returnValue":true,"cancelBubble":false,"path":{"0":{"id":"screen"},"1":{"id":"back"},"2":{"id":""},"3":{"id":""},"4":{},"5":"Window"},"composedPath":{},"stopPropagation":{},"stopImmediatePropagation":{},"preventDefault":{},"initEvent":{}}
不确定是否有帮助,但我刚在Angular JS文档中偶然发现了这个:
*来源:https://code.angularjs.org/1.5.5/docs/guide/expression#-event-
/*
* return a copy of an object with only non-object keys
* we need this to avoid circular references
*/
function simpleKeys (original) {
return Object.keys(original).reduce(function (obj, key) {
obj[key] = typeof original[key] === 'object' ? '{ ... }' : original[key];
return obj;
}, {});
}
JSON.stringify(simpleKeys(eventObject));
{isTrusted: true}
。 - user736893MouseEvent
都是相同的。 - Blightbuster所以,问题在于JSON.stringify一旦发现循环引用就会退出。我本来也不关心循环引用的属性。我得到其余属性的方法是
var str = "{"
for (var key in data) {
if (JSON.stringify(data[key]) !== "") {
str += key + ":" + data[key]) + ",";
}
}
str += "}"
这将基本上给你其余的属性。为了避免JS错误,您可以将其放在try/catch中。