本文介绍了未捕获的TypeError:无法读取null的属性"getSelection"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
我正在使用以下代码来模拟元素上的鼠标单击事件.
I am using following code to simulate mouse click event on an element.
var composeEl = $('.asf.T-I-J3.J-J5-Ji:visible')[0];
if (composeEl) {
//Trigger mouse down event
var mouseDown = document.createEvent('MouseEvents');
mouseDown.initEvent('mousedown', true, false);
composeEl.dispatchEvent(mouseDown)
//Trigger mouse up event
var mouseUp = document.createEvent('MouseEvents');
mouseUp.initEvent('mouseup', true, false);
composeEl.dispatchEvent(mouseUp)
}
它工作正常，可以单击，但会在控制台中抛出此错误
it works fine, its clicking but throw this error in console
Uncaught TypeError: Cannot read property 'getSelection' of null.
此javascript代码有什么问题?
What is wrong with this javascript code?
Chrome在content.js文件中显示错误.我不包括此文件.错误在这条线上var c=b.view.getSelection();在下面的代码中
Chrome show error in content.js file. I am not including this file.error is on this linevar c=b.view.getSelection(); in below code
var m;if (!window.a) {
var t = function() {
var b = window.self === window.top;
this.k = (this.G = b) ? 0 : null;
this.s = this.d = !1;
this.j = this.i = -1;
this.F = 1;
this.c = {};
this.q = [];
var c = chrome.extension.connect({
name: b ? "top" : "sub"
});
this.a = c;
this.r = c.a || Math.ceil(975 * Math.random());
c.onMessage.addListener(this.onMessage.bind(this));
c.onDisconnect.addListener(this.v.bind(this));
this.b(window, "scroll", this.O, !0);
this.b(window, "keydown", this.u, !0);
this.b(window, "keyup", this.u, !0);
this.b(window, "mousedown", this.L, !0);
this.b(window, "mouseup",
this.M, !0);
this.b(window, "blur", this.K, !0);
this.b(document, "beforeload", this.I, !0);
this.b(document, "DOMContentLoaded", this.J);
b && this.b(window, "resize", this.N)
};
window.a = !0;
var x = {
16: !0,
17: !0,
18: !0,
45: !0,
46: !0
},
C = ["VIDEO", "AUDIO", "OBJECT", "EMBED"],
D = new RegExp(atob("eXRwbGF5ZXJcLmNvbmZpZ1xzKj1ccypcew=="));
m = t.prototype;
m.A = function(b, c, e, f) {
try {
var d = document.activeElement,
n = d && 0 <= C.indexOf(d.tagName) ? d : null;
n || (n = (d = document.elementFromPoint(this.i, this.j)) && 0 <= C.indexOf(d.tagName) ? d : null);
for (var k =
0, p, q, r, h, l = 0; l < C.length; l++) {
for (var g = document.getElementsByTagName(C[l]), w = 0; w < g.length; w++)
if (d = g[w], 3 != l || "application/x-shockwave-flash" == d.type.toLowerCase()) {
var s = d.src || d.data;
if (s && (s == b || s == c)) {
p = d;
break
}
if (!n && !q)
if (!s || s != e && s != f) {
var u = d.clientWidth,
v = d.clientHeight;
if (u && v) {
var y = d.getBoundingClientRect();
if (!(0 >= y.right + window.scrollX || 0 >= y.bottom + window.scrollY)) {
var z = window.getComputedStyle(d);
if (!z || "hidden" != z.visibility) {
var A = u * v;
A > k && 1.35 * u > v && u < 3 * v && (k = A, r = d);
h || (h = d)
}
}
}
} else q =
d
}
if (p) break
}
b = p || n || q || r || h;
if (!b) return null;
if ("EMBED" == b.tagName && !b.clientWidth && !b.clientHeight) {
var B = b.parentElement;
"OBJECT" == B.tagName && (b = B)
}
return this.g(b)
} catch (E) {}
};
m.w = function(b, c, e) {
try {
for (var f = [], d, f = Array.prototype.concat.apply(f, document.getElementsByTagName("FRAME")), f = Array.prototype.concat.apply(f, document.getElementsByTagName("IFRAME")), n = 0; n < f.length; n++) {
var k = f[n];
if (parseInt(k.getAttribute("__idm_frm__")) == b) {
d = k;
break
}
if (!d) {
var p = k.src;
!p || p != c && p != e || (d = k)
}
}
return this.g(d)
} catch (q) {}
};
m.p = function() {
var b = window.devicePixelRatio,
c = document.width,
e = document.body.scrollWidth;
c && e && (b = c == e ? 0 : c / e);
return b
};
m.n = function(b) {
try {
var c = b.getBoundingClientRect(),
e = Math.round(c.width),
f = Math.round(c.height);
if (15 > e || 15 > f) return null;
var d = document.documentElement,
n = d.scrollHeight || d.clientHeight,
k = Math.round(c.left) + b.clientLeft,
p = Math.round(c.top) + b.clientTop;
return k >= (d.scrollWidth || d.clientWidth) || p >= n ? null : {
left: k,
top: p,
right: k + e,
bottom: p + f,
zoom: this.p()
}
} catch (q) {}
};
m.o = function() {
this.a.postMessage([21,
window.location.href
])
};
m.f = function(b) {
if (b) {
if (!this.H) {
this.H = !0;
this.b(window, "message", this.P);
var c = document.createElement("script");
c.src = chrome.extension.getURL("document.js");
c.onload = function() {
c.parentNode.removeChild(c)
};
document.documentElement.appendChild(c)
}
window.setTimeout(function() {
window.postMessage([1], "/")
}, 3E3)
} else if ("loading" == document.readyState) this.t = !0;
else {
this.t = !1;
b = document.getElementsByTagName("SCRIPT");
for (var e = 0; e < b.length; e++)
if (c = b[e], !c.src && D.test(c.innerText)) {
b =
this.h();
this.a.postMessage([34, b, -1, c.outerHTML]);
break
}
}
};
m.P = function(b) {
var c = b.data;
c instanceof Array && b.origin == (document.origin || location.origin) && 2 == c[0] && this.a.postMessage([34, c[1], -1, c[2]])
};
m.D = function(b) {
var c = b[2] || this.w(b[3], b[4], b[5]),
e = c && this.c[c],
e = e && this.n(e);
this.a.postMessage([22, b[1], b[3], c, e])
};
m.C = function(b) {
var c = !b[2],
e = b[2] || this.A(b[3], b[4], b[5], b[6]);
b = [23, b[1], e, !1];
var f = e && this.c[e];
if (f) {
var d = this.n(f);
d && (b[4] = d);
c ? (b[5] = f.tagName, b[6] = f.src || f.data, b[7] = this.h()) :
d || document.contains(f) || (b[3] = !0, delete this.c[e])
}
this.a.postMessage(b)
};
m.g = function(b) {
try {
var c = parseInt(b.getAttribute("__idm_id__"));
c || (c = this.r << 10 | this.F++, b.setAttribute("__idm_id__", c));
this.c[c] = b;
return c
} catch (e) {}
};
m.h = function(b) {
var c;
try {
c = window.top.document.title
} catch (e) {}
if (c)
if (c = c.replace(/[ \t\r\n\u25B6]+/g, " ").trim(), b) this.a.postMessage([24, b, c]);
else return c
};
m.e = function(b) {
if (!this.l) {
var c = "\\b\\w+://(?:[%T]*(?::[%T]*)?@)?[%H.]+\\.[%H]+(?::\\d+)?(?:/(?:(?: +(?!\\w+:))?[%T/~;])*)?(?:\\?[%Q]*)?(?:#[%T]*)?".replace(/%\w/g,
function(b) {
return this[b]
}.bind({
"%H": "\\w\\-\u00a0-\ufeff",
"%T": "\\w\\-.+*()$!,%\u00a0-\ufeff",
"%Q": "^\\s\\[\\]{}()"
}));
this.l = new RegExp(c, "gi")
}
for (var e = []; c = this.l.exec(b);) e.push(c.shift());
return e
};
m.m = function(b, c, e) {
var f = [],
d = {},
n = "",
k = "",
p = !e,
q;
if (e && (q = b.getSelection(), !q || q.isCollapsed)) return f;
var r = b.getElementsByTagName("A");
if (r)
for (var h = 0; h < r.length; h++) {
var l = r[h];
if (l && (p || q.containsNode(l, !0))) {
var g = l.href;
g && !d[g] && c.test(g) && (d[g] = f.push([g, 2, l.innerText || l.title]));
e &&
d[g] && (n += l.innerText, n += "\n")
}
}
if (r = b.getElementsByTagName("AREA"))
for (h = 0; h < r.length; h++)(l = r[h]) && (p || q.containsNode(l, !0)) && (g = l.href) && !d[g] && c.test(g) && (d[g] = f.push([g, 2, l.alt]));
if (r = p && b.getElementsByTagName("IFRAME"))
for (h = 0; h < r.length; h++)(l = r[h]) && (p || q.containsNode(l, !0)) && (g = l.src) && !d[g] && c.test(g) && (d[g] = f.push([g, 4]));
if (h = e && q.toString())
for (l = this.e(h), n = this.e(n), h = 0; h < l.length; h++)(g = l[h]) && !d[g] && c.test(g) && 0 > n.indexOf(g) && (d[g] = f.push([g, 1]));
if (n = (p || !f.length) && b.getElementsByTagName("IMG"))
for (h =
0; h < n.length; h++)(l = n[h]) && (p || q.containsNode(l, !0)) && ((g = l.src) && !d[g] && c.test(g) && (d[g] = f.push([g, 3, "<<<=IDMTRANSMITIMGPREFIX=>>>" + l.alt])), p && l.onclick && (k += l.onclick, k += "\n"));
if (b = p && b.getElementsByTagName("SCRIPT")) {
for (h = 0; h < b.length; h++) k += b[h].innerText, k += "\n";
for (k = this.e(k); k.length;)(g = k.shift()) && !d[g] && c.test(g) && (d[g] = f.push([g, 5]))
}
return f
};
m.B = function(b, c) {
for (var e = this.m(document, b, c), f = document.getElementsByTagName("IFRAME"), d = Array.prototype.push, n = 0; n < f.length; n++) try {
var k =
f[n],
p = k.contentDocument;
p && !k.src && d.apply(e, this.m(p, b, c))
} catch (q) {}
return e
};
m.u = function(b) {
x[b.keyCode] && this.a.postMessage([31, b.keyCode, "keydown" == b.type])
};
m.L = function(b) {
this.s && this.a.postMessage([28]);
if (0 == b.button) {
var c = b.view.getSelection();
this.d = c && c.isCollapsed;
this.a.postMessage([32, b.button, !0])
}
};
m.M = function(b) {
if (0 == b.button && (this.i = b.clientX, this.j = b.clientY, this.a.postMessage([32, b.button, !1]), this.d)) {
this.d = !1;
var c = b.view.getSelection();
c && !c.isCollapsed && this.a.postMessage([26,
b.clientX, b.clientY, this.p()
])
}
};
m.K = function() {
this.d = !1;
this.a.postMessage([33])
};
m.O = function() {
this.a.postMessage([29])
};
m.N = function(b) {
b = b.target;
this.a.postMessage([30, b.innerWidth, b.innerHeight])
};
m.I = function(b) {
var c = b.target,
e = c.tagName;
0 <= C.indexOf(e) && b.url && (c = this.g(c), this.a.postMessage([25, c, e, b.url]))
};
m.J = function() {
this.t && this.f()
};
m.onMessage = function(b) {
switch (b[0]) {
case 11:
var c = b[2];
if (c) {
this.k = c;
try {
window.frameElement && window.frameElement.setAttribute("__idm_frm__", c)
} catch (e) {}
}
b[3] &&
this.o();
b[4] && this.f();
break;
case 17:
b[1] && this.o();
b[2] && this.f(!0);
break;
case 12:
var c = this.B(b[4] ? new RegExp(b[4], "i") : null, b[2]),
f = [27, b[1], this.k, c.length];
b[3] || (f[4] = c, f[5] = window.location.href, this.G && (f[6] = window.location.href, f[7] = document.title));
this.a.postMessage(f);
break;
case 13:
this.s = b[1];
break;
case 14:
this.h(b[1]);
break;
case 15:
this.C(b);
break;
case 16:
this.D(b)
}
};
m.b = function(b) {
var c = Array.prototype.slice.call(arguments);
c[2] = c[2].bind(this);
this.q.push(c);
b.addEventListener.apply(b,
c.slice(1))
};
m.v = function() {
for (var b; b = this.q.shift();) {
var c = b.shift();
c.removeEventListener.apply(c, b)
}
this.a = this.r = null;
window.a = !1
};
new t
};
推荐答案
您的chrome扩展程序之一似乎抛出了JavaScript错误.请停用所有的Chrome扩展程序并进行测试.如果已安装，请特别禁用Internet Download Manager.
It looks like one of your chrome extensions is throwing a javascript error. Please disable all of your chrome extensions and test. Especially disable Internet Download Manager if you have it installed.
这篇关于未捕获的TypeError:无法读取null的属性"getSelection"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！