我正在尝试编写一个扩展程序，允许Facebook用户在将鼠标悬停在帖子顶部并按“L”键时喜欢帖子。我之前在其他网站上取得了成功，当“喜欢”创建为按钮但显然Facebook创建了“喜欢”作为“链接”。
在此演员表中，jQuery的.click（）命令无法触发实际的点击。有替代方案吗？
我使用的代码是：
$(window).keypress(function(e){
if (e.keyCode == 108) {
$('.x72:hover .UFILikeLink').click();
}
});
答案 0 :(得分：1)
使用悬停点击不是一个好主意，因为Facebook有一个评论部分，当你输入评论时会记录按键 - 但是如果你使用一些罕见的击键，它可能没问题。
此外，Facebook上的类似按钮是通过标签中的跨度而不是标签本身来实现的，因此您需要的代码是：
$(window).keypress(function(e){
if (e.keyCode == 108) {
$('._4-u2:hover .UFILikeLink span').click();
}
});
现在，如果您确实需要在将来点击标签，请输入您需要的代码：
首先，生成假浏览器点击：
;(function( $, undefined ) {
var rkeyEvent = /^key/,
rmouseEvent = /^(?:mouse|contextmenu)|click/;
$.fn.simulate = function( type, options ) {
return this.each(function() {
new $.simulate( this, type, options );
});
};
$.simulate = function( elem, type, options ) {
var method = $.camelCase( "simulate-" + type );
this.target = elem;
this.options = options;
if ( this[ method ] ) {
this[ method ]();
} else {
this.simulateEvent( elem, type, options );
}
};
$.extend( $.simulate, {
keyCode: {
BACKSPACE: 8,
COMMA: 188,
DELETE: 46,
DOWN: 40,
END: 35,
ENTER: 13,
ESCAPE: 27,
HOME: 36,
LEFT: 37,
NUMPAD_ADD: 107,
NUMPAD_DECIMAL: 110,
NUMPAD_DIVIDE: 111,
NUMPAD_ENTER: 108,
NUMPAD_MULTIPLY: 106,
NUMPAD_SUBTRACT: 109,
PAGE_DOWN: 34,
PAGE_UP: 33,
PERIOD: 190,
RIGHT: 39,
SPACE: 32,
TAB: 9,
UP: 38
},
buttonCode: {
LEFT: 0,
MIDDLE: 1,
RIGHT: 2
}
});
$.extend( $.simulate.prototype, {
simulateEvent: function( elem, type, options ) {
var event = this.createEvent( type, options );
this.dispatchEvent( elem, type, event, options );
},
createEvent: function( type, options ) {
if ( rkeyEvent.test( type ) ) {
return this.keyEvent( type, options );
}
if ( rmouseEvent.test( type ) ) {
return this.mouseEvent( type, options );
}
},
mouseEvent: function( type, options ) {
var event, eventDoc, doc, body;
options = $.extend({
bubbles: true,
cancelable: (type !== "mousemove"),
view: window,
detail: 0,
screenX: 0,
screenY: 0,
clientX: 1,
clientY: 1,
ctrlKey: false,
altKey: false,
shiftKey: false,
metaKey: false,
button: 0,
relatedTarget: undefined
}, options );
if ( document.createEvent ) {
event = document.createEvent( "MouseEvents" );
event.initMouseEvent( type, options.bubbles, options.cancelable,
options.view, options.detail,
options.screenX, options.screenY, options.clientX, options.clientY,
options.ctrlKey, options.altKey, options.shiftKey, options.metaKey,
options.button, options.relatedTarget || document.body.parentNode );
// IE 9+ creates events with pageX and pageY set to 0.
// Trying to modify the properties throws an error,
// so we define getters to return the correct values.
if ( event.pageX === 0 && event.pageY === 0 && Object.defineProperty ) {
eventDoc = event.relatedTarget.ownerDocument || document;
doc = eventDoc.documentElement;
body = eventDoc.body;
Object.defineProperty( event, "pageX", {
get: function() {
return options.clientX +
( doc && doc.scrollLeft || body && body.scrollLeft || 0 ) -
( doc && doc.clientLeft || body && body.clientLeft || 0 );
}
});
Object.defineProperty( event, "pageY", {
get: function() {
return options.clientY +
( doc && doc.scrollTop || body && body.scrollTop || 0 ) -
( doc && doc.clientTop || body && body.clientTop || 0 );
}
});
}
} else if ( document.createEventObject ) {
event = document.createEventObject();
$.extend( event, options );
// standards event.button uses constants defined here: http://msdn.microsoft.com/en-us/library/ie/ff974877(v=vs.85).aspx
// old IE event.button uses constants defined here: http://msdn.microsoft.com/en-us/library/ie/ms533544(v=vs.85).aspx
// so we actually need to map the standard back to oldIE
event.button = {
0: 1,
1: 4,
2: 2
}[ event.button ] || ( event.button === -1 ? 0 : event.button );
}
return event;
},
keyEvent: function( type, options ) {
var event;
options = $.extend({
bubbles: true,
cancelable: true,
view: window,
ctrlKey: false,
altKey: false,
shiftKey: false,
metaKey: false,
keyCode: 0,
charCode: undefined
}, options );
if ( document.createEvent ) {
try {
event = document.createEvent( "KeyEvents" );
event.initKeyEvent( type, options.bubbles, options.cancelable, options.view,
options.ctrlKey, options.altKey, options.shiftKey, options.metaKey,
options.keyCode, options.charCode );
// initKeyEvent throws an exception in WebKit
// see: http://stackoverflow.com/questions/6406784/initkeyevent-keypress-only-works-in-firefox-need-a-cross-browser-solution
// and also https://bugs.webkit.org/show_bug.cgi?id=13368
// fall back to a generic event until we decide to implement initKeyboardEvent
} catch( err ) {
event = document.createEvent( "Events" );
event.initEvent( type, options.bubbles, options.cancelable );
$.extend( event, {
view: options.view,
ctrlKey: options.ctrlKey,
altKey: options.altKey,
shiftKey: options.shiftKey,
metaKey: options.metaKey,
keyCode: options.keyCode,
charCode: options.charCode
});
}
} else if ( document.createEventObject ) {
event = document.createEventObject();
$.extend( event, options );
}
if ( !!/msie [\w.]+/.exec( navigator.userAgent.toLowerCase() ) || (({}).toString.call( window.opera ) === "[object Opera]") ) {
event.keyCode = (options.charCode > 0) ? options.charCode : options.keyCode;
event.charCode = undefined;
}
return event;
},
dispatchEvent: function( elem, type, event ) {
if ( elem[ type ] ) {
elem[ type ]();
} else if ( elem.dispatchEvent ) {
elem.dispatchEvent( event );
} else if ( elem.fireEvent ) {
elem.fireEvent( "on" + type, event );
}
},
simulateFocus: function() {
var focusinEvent,
triggered = false,
element = $( this.target );
function trigger() {
triggered = true;
}
element.bind( "focus", trigger );
element[ 0 ].focus();
if ( !triggered ) {
focusinEvent = $.Event( "focusin" );
focusinEvent.preventDefault();
element.trigger( focusinEvent );
element.triggerHandler( "focus" );
}
element.unbind( "focus", trigger );
},
simulateBlur: function() {
var focusoutEvent,
triggered = false,
element = $( this.target );
function trigger() {
triggered = true;
}
element.bind( "blur", trigger );
element[ 0 ].blur();
// blur events are async in IE
setTimeout(function() {
// IE won't let the blur occur if the window is inactive
if ( element[ 0 ].ownerDocument.activeElement === element[ 0 ] ) {
element[ 0 ].ownerDocument.body.focus();
}
// Firefox won't trigger events if the window is inactive
// IE doesn't trigger events if we had to manually focus the body
if ( !triggered ) {
focusoutEvent = $.Event( "focusout" );
focusoutEvent.preventDefault();
element.trigger( focusoutEvent );
element.triggerHandler( "blur" );
}
element.unbind( "blur", trigger );
}, 1 );
}
});
/** complex events **/
function findCenter( elem ) {
var offset,
document = $( elem.ownerDocument );
elem = $( elem );
offset = elem.offset();
return {
x: offset.left + elem.outerWidth() / 2 - document.scrollLeft(),
y: offset.top + elem.outerHeight() / 2 - document.scrollTop()
};
}
function findCorner( elem ) {
var offset,
document = $( elem.ownerDocument );
elem = $( elem );
offset = elem.offset();
return {
x: offset.left - document.scrollLeft(),
y: offset.top - document.scrollTop()
};
}
$.extend( $.simulate.prototype, {
simulateDrag: function() {
var i = 0,
target = this.target,
eventDoc = target.ownerDocument,
options = this.options,
center = options.handle === "corner" ? findCorner( target ) : findCenter( target ),
x = Math.floor( center.x ),
y = Math.floor( center.y ),
coord = { clientX: x, clientY: y },
dx = options.dx || ( options.x !== undefined ? options.x - x : 0 ),
dy = options.dy || ( options.y !== undefined ? options.y - y : 0 ),
moves = options.moves || 3;
this.simulateEvent( target, "mousedown", coord );
for ( ; i < moves ; i++ ) {
x += dx / moves;
y += dy / moves;
coord = {
clientX: Math.round( x ),
clientY: Math.round( y )
};
this.simulateEvent( eventDoc, "mousemove", coord );
}
if ( $.contains( eventDoc, target ) ) {
this.simulateEvent( target, "mouseup", coord );
this.simulateEvent( target, "click", coord );
} else {
this.simulateEvent( eventDoc, "mouseup", coord );
}
}
});
})( jQuery );
现在您可以通过以下方式“模拟”点击次数：
$(window).keypress(function(e){
if (e.keyCode == 108) {
$('._4-u2:hover .UFILikeLink').simulate('click');
}
});
干杯。