我试图在
jquery ui自动完成中覆盖一个函数.
当我做
$.ui.autocomplete.prototype._create = function() {
var self = this,doc = this.element[ 0 ].ownerDocument,suppressKeyPress;
this._value( ... ) ;
我收到了错误._value未定义.
我知道这个背景搞砸了.我该如何解决？
我尝试使用$.proxy,但后来我不知道如何引用原始$.ui.autocomplete的内部闭包的上下文.
编辑：
好的,让我打破这个.我想编辑jquery自动完成功能,这样当用户点击自定义内容时,它将忽略它而不是输入它.
最初的问题来自于：JQuery Autocomplete. If item cannot be found,display “Press Enter to insert into autocomplete”?
那么让我们分解一下问题：
我正在扩展这个功能：
$.ui.autocomplete.prototype._create = function() {
console.log(this,$.ui.autocomplete);
var self = this,suppressKeyPress;
this.valueMethod = this.element[ this.element.is( "input" ) ? "val" : "text" ];
this.element
.addClass( "ui-autocomplete-input" )
.attr( "autocomplete","off" )
// Todo verify these actually work as intended
.attr({
role: "textBox","aria-autocomplete": "list","aria-haspopup": "true"
})
.bind( "keydown.autocomplete",function( event ) {
if ( self.options.disabled || self.element.attr( "readonly" ) ) {
return;
}
suppressKeyPress = false;
var keyCode = $.ui.keyCode;
switch( event.keyCode ) {
case keyCode.PAGE_UP:
self._move( "prevIoUsPage",event );
break;
case keyCode.PAGE_DOWN:
self._move( "nextPage",event );
break;
case keyCode.UP:
self._move( "prevIoUs",event );
// prevent moving cursor to beginning of text field in some browsers
event.preventDefault();
break;
case keyCode.DOWN:
self._move( "next",event );
// prevent moving cursor to end of text field in some browsers
event.preventDefault();
break;
case keyCode.ENTER:
case keyCode.NUMPAD_ENTER:
// when menu is open and has focus
if ( self.menu.active ) {
// #6055 - Opera still allows the keypress to occur
// which causes forms to submit
suppressKeyPress = true;
event.preventDefault();
}
//passthrough - ENTER and TAB both select the current element
case keyCode.TAB:
if ( !self.menu.active ) {
return;
}
self.menu.select( event );
break;
case keyCode.ESCAPE:
self._value( self.term );
self.close( event );
break;
default:
// keypress is triggered before the input value is changed
clearTimeout( self.searching );
self.searching = setTimeout(function() {
// only search if the value has changed
if ( self.term != self._value() ) {
self.selectedItem = null;
self.search( null,event );
}
},self.options.delay );
break;
}
})
.bind( "keypress.autocomplete",function( event ) {
if ( suppressKeyPress ) {
suppressKeyPress = false;
event.preventDefault();
}
})
.bind( "focus.autocomplete",function() {
if ( self.options.disabled ) {
return;
}
self.selectedItem = null;
self.prevIoUs = self._value();
})
.bind( "blur.autocomplete",function( event ) {
if ( self.options.disabled ) {
return;
}
clearTimeout( self.searching );
// clicks on the menu (or a button to trigger a search) will cause a blur event
self.closing = setTimeout(function() {
self.close( event );
self._change( event );
},150 );
});
this._initSource();
this.response = function() {
return self._response.apply( self,arguments );
};
this.menu = $( "<ul></ul>" )
.addClass( "ui-autocomplete" )
.appendTo( $( this.options.appendTo || "body",doc )[0] )
// prevent the close-on-blur in case of a "slow" click on the menu (long mousedown)
.mousedown(function( event ) {
// clicking on the scrollbar causes focus to shift to the body
// but we can't detect a mouseup or a click immediately afterward
// so we have to track the next mousedown and close the menu if
// the user clicks somewhere outside of the autocomplete
var menuElement = self.menu.element[ 0 ];
if ( !$( event.target ).closest( ".ui-menu-item" ).length ) {
setTimeout(function() {
$( document ).one( 'mousedown',function( event ) {
if ( event.target !== self.element[ 0 ] &&
event.target !== menuElement &&
!$.contains( menuElement,event.target ) ) {
self.close();
}
});
},1 );
}
// use another timeout to make sure the blur-event-handler on the input was already triggered
setTimeout(function() {
clearTimeout( self.closing );
},13);
})
.menu({
// custom key handling for Now
input: $(),focus: function( event,ui ) {
var item = ui.item.data( "item.autocomplete" );
if ( false !== self._trigger( "focus",event,{ item: item } ) ) {
// use value to match what will end up in the input,if it was a key event
if ( /^key/.test(event.originalEvent.type) ) {
self._value( item.value );
}
}
},select: function( event,ui ) {
console.log(event,ui);
var item = ui.item.data( "item.autocomplete" ),prevIoUs = self.prevIoUs;
// only trigger when focus was lost (click on menu)
if ( self.element[0] !== doc.activeElement ) {
self.element.focus();
self.prevIoUs = prevIoUs;
// #6109 - IE triggers two focus events and the second
// is asynchronous,so we need to reset the prevIoUs
// term synchronously and asynchronously :-(
setTimeout(function() {
self.prevIoUs = prevIoUs;
self.selectedItem = item;
},1);
}
if ( false !== self._trigger( "select",{ item: item } ) ) {
self._value( item.value );
}
// reset the term after the select event
// this allows custom select handling to work properly
self.term = self._value();
self.close( event );
self.selectedItem = item;
},blur: function( event,ui ) {
// don't set the value of the text field if it's already correct
// this prevents moving the cursor unnecessarily
if ( self.menu.element.is(":visible") &&
( self._value() !== self.term ) ) {
self._value( self.term );
}
}
})
.zIndex( this.element.zIndex() + 1 )
.hide()
.data( "menu" );
if ( $.fn.bgiframe ) {
this.menu.element.bgiframe();
}
};
这是从jquery.ui.autcomplete.js直接复制的
为方便起见,jQuery自动填充功能发现于https://github.com/jquery/jquery-ui/blob/master/ui/jquery.ui.autocomplete.js
解决方法
而不是试图像这样扩展创建功能,我建议去这里
http://jqueryui.com/demos/autocomplete/#custom-data并查看源.它显示了自定义选择事件,这些事件听起来更符合您的需求并且更容易实现.如果所选元素的值为“按Enter键创建此标记”,则只能在select事件中返回false.
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