我是javascript的新手，我正在尝试将一个组合框添加到我正在创建的表单中，我希望用户能够输入答案或从下拉菜单中选择一个。我在网上找到了一个插件并进行了设置。下拉列表工作正常，但用户输入的答案不会存储在文本字段中，当您单击文本框时它会消失。
我查看代码的onblur部分，看看我是否可以改变行为，但我无法做到。有人可以帮忙吗？代码如下。
我的HTML（我使用Bootstrap）
<div class="col-md-4">
<div class="form-group">
<div class="input-group">
<label for="user_id" class="input-group-addon">User ID</label>
<select class="combobox input-large form-control" name="user_id" id="user_id">
<option value="" selected="selected">Enter ID</option>
<option value="ML">Multiple Users</option>
<option value="UN">Unknow User</option>
</select>
</div>
</div>
</div>
和Javascript
!function( $ ) {
"use strict";
/* COMBOBOX PUBLIC CLASS DEFINITION
* ================================ */
var Combobox = function ( element, options ) {
this.options = $.extend({}, $.fn.combobox.defaults, options);
this.template = this.options.template || this.template
this.$source = $(element);
this.$container = this.setup();
this.$element = this.$container.find('input[type=text]');
this.$target = this.$container.find('input[type=hidden]');
this.$button = this.$container.find('.dropdown-toggle');
this.$menu = $(this.options.menu).appendTo('body');
this.matcher = this.options.matcher || this.matcher;
this.sorter = this.options.sorter || this.sorter;
this.highlighter = this.options.highlighter || this.highlighter;
this.shown = false;
this.selected = false;
this.refresh();
this.transferAttributes();
this.listen();
};
Combobox.prototype = {
constructor: Combobox
, setup: function () {
var combobox = $(this.template());
this.$source.before(combobox);
this.$source.hide();
return combobox;
}
, disable: function() {
this.$element.prop('disabled', true);
this.$button.attr('disabled', true);
this.disabled = true;
this.$container.addClass('combobox-disabled');
}
, enable: function() {
this.$element.prop('disabled', false);
this.$button.attr('disabled', false);
this.disabled = false;
this.$container.removeClass('combobox-disabled');
}
, parse: function () {
var that = this
, map = {}
, source = []
, selected = false
, selectedValue = '';
this.$source.find('option').each(function() {
var option = $(this);
if (option.val() === '') {
that.options.placeholder = option.text();
return;
}
map[option.text()] = option.val();
source.push(option.text());
if (option.prop('selected')) {
selected = option.text();
selectedValue = option.val();
}
})
this.map = map;
if (selected) {
this.$element.val(selected);
this.$target.val(selectedValue);
this.$container.addClass('combobox-selected');
this.selected = true;
}
return source;
}
, transferAttributes: function() {
this.options.placeholder = this.$source.attr('data-placeholder') || this.options.placeholder
this.$element.attr('placeholder', this.options.placeholder)
this.$target.prop('name', this.$source.prop('name'))
this.$target.val(this.$source.val())
this.$source.removeAttr('name') // Remove from source otherwise form will pass parameter twice.
this.$element.attr('required', this.$source.attr('required'))
this.$element.attr('rel', this.$source.attr('rel'))
this.$element.attr('title', this.$source.attr('title'))
this.$element.attr('class', this.$source.attr('class'))
this.$element.attr('tabindex', this.$source.attr('tabindex'))
this.$source.removeAttr('tabindex')
if (this.$source.attr('disabled')!==undefined)
this.disable();
}
, select: function () {
var val = this.$menu.find('.active').attr('data-value');
this.$element.val(this.updater(val)).trigger('change');
this.$target.val(this.map[val]).trigger('change');
this.$source.val(this.map[val]).trigger('change');
this.$container.addClass('combobox-selected');
this.selected = true;
return this.hide();
}
, updater: function (item) {
return item;
}
, show: function () {
var pos = $.extend({}, this.$element.position(), {
height: this.$element[0].offsetHeight
});
this.$menu
.insertAfter(this.$element)
.css({
top: pos.top + pos.height
, left: pos.left
})
.show();
$('.dropdown-menu').on('mousedown', $.proxy(this.scrollSafety, this));
this.shown = true;
return this;
}
, hide: function () {
this.$menu.hide();
$('.dropdown-menu').off('mousedown', $.proxy(this.scrollSafety, this));
this.$element.on('blur', $.proxy(this.blur, this));
this.shown = false;
return this;
}
, lookup: function (event) {
this.query = this.$element.val();
return this.process(this.source);
}
, process: function (items) {
var that = this;
items = $.grep(items, function (item) {
return that.matcher(item);
})
items = this.sorter(items);
if (!items.length) {
return this.shown ? this.hide() : this;
}
return this.render(items.slice(0, this.options.items)).show();
}
, template: function() {
if (this.options.bsVersion == '2') {
return '<div class="combobox-container"><input type="hidden" /> <div class="input-append"> <input type="text" autocomplete="off" /> <span class="add-on dropdown-toggle" data-dropdown="dropdown"> <span class="caret"/> <i class="icon-remove"/> </span> </div> </div>'
} else {
return '<div class="combobox-container"> <input type="hidden" /> <div class="input-group"> <input type="text" autocomplete="off" /> <span class="input-group-addon dropdown-toggle" data-dropdown="dropdown"> <span class="caret" /> <span class="glyphicon glyphicon-remove" /> </span> </div> </div>'
}
}
, matcher: function (item) {
return ~item.toLowerCase().indexOf(this.query.toLowerCase());
}
, sorter: function (items) {
var beginswith = []
, caseSensitive = []
, caseInsensitive = []
, item;
while (item = items.shift()) {
if (!item.toLowerCase().indexOf(this.query.toLowerCase())) {beginswith.push(item);}
else if (~item.indexOf(this.query)) {caseSensitive.push(item);}
else {caseInsensitive.push(item);}
}
return beginswith.concat(caseSensitive, caseInsensitive);
}
, highlighter: function (item) {
var query = this.query.replace(/[\-\[\]{}()*+?.,\\\^$|#\s]/g, '\\$&');
return item.replace(new RegExp('(' + query + ')', 'ig'), function ($1, match) {
return '<strong>' + match + '</strong>';
})
}
, render: function (items) {
var that = this;
items = $(items).map(function (i, item) {
i = $(that.options.item).attr('data-value', item);
i.find('a').html(that.highlighter(item));
return i[0];
})
items.first().addClass('active');
this.$menu.html(items);
return this;
}
, next: function (event) {
var active = this.$menu.find('.active').removeClass('active')
, next = active.next();
if (!next.length) {
next = $(this.$menu.find('li')[0]);
}
next.addClass('active');
}
, prev: function (event) {
var active = this.$menu.find('.active').removeClass('active')
, prev = active.prev();
if (!prev.length) {
prev = this.$menu.find('li').last();
}
prev.addClass('active');
}
, toggle: function () {
if (!this.disabled) {
if (this.$container.hasClass('combobox-selected')) {
this.clearTarget();
this.triggerChange();
this.clearElement();
} else {
if (this.shown) {
this.hide();
} else {
this.clearElement();
this.lookup();
}
}
}
}
, scrollSafety: function(e) {
if (e.target.tagName == 'UL') {
this.$element.off('blur');
}
}
, clearElement: function () {
this.$element.val('').focus();
}
, clearTarget: function () {
this.$source.val('');
this.$target.val('');
this.$container.removeClass('combobox-selected');
this.selected = false;
}
, triggerChange: function () {
this.$source.trigger('change');
}
, refresh: function () {
this.source = this.parse();
this.options.items = this.source.length;
}
, listen: function () {
this.$element
.on('focus', $.proxy(this.focus, this))
.on('blur', $.proxy(this.blur, this))
.on('keypress', $.proxy(this.keypress, this))
.on('keyup', $.proxy(this.keyup, this));
if (this.eventSupported('keydown')) {
this.$element.on('keydown', $.proxy(this.keydown, this));
}
this.$menu
.on('click', $.proxy(this.click, this))
.on('mouseenter', 'li', $.proxy(this.mouseenter, this))
.on('mouseleave', 'li', $.proxy(this.mouseleave, this));
this.$button
.on('click', $.proxy(this.toggle, this));
}
, eventSupported: function(eventName) {
var isSupported = eventName in this.$element;
if (!isSupported) {
this.$element.setAttribute(eventName, 'return;');
isSupported = typeof this.$element[eventName] === 'function';
}
return isSupported;
}
, move: function (e) {
if (!this.shown) {return;}
switch(e.keyCode) {
case 9: // tab
case 13: // enter
case 27: // escape
e.preventDefault();
break;
case 38: // up arrow
e.preventDefault();
this.prev();
break;
case 40: // down arrow
e.preventDefault();
this.next();
break;
}
e.stopPropagation();
}
, keydown: function (e) {
this.suppressKeyPressRepeat = ~$.inArray(e.keyCode, [40,38,9,13,27]);
this.move(e);
}
, keypress: function (e) {
if (this.suppressKeyPressRepeat) {return;}
this.move(e);
}
, keyup: function (e) {
switch(e.keyCode) {
case 40: // down arrow
case 39: // right arrow
case 38: // up arrow
case 37: // left arrow
case 36: // home
case 35: // end
case 16: // shift
case 17: // ctrl
case 18: // alt
break;
case 9: // tab
case 13: // enter
if (!this.shown) {return;}
this.select();
break;
case 27: // escape
if (!this.shown) {return;}
this.hide();
break;
default:
this.clearTarget();
this.lookup();
}
e.stopPropagation();
e.preventDefault();
}
, focus: function (e) {
this.focused = true;
}
, blur: function (e) {
var that = this;
this.focused = false;
var val = this.$element.val();
if (!this.selected && val !== '' ) {
this.$element.val('');
this.$source.val('').trigger('change');
this.$target.val('').trigger('change');
}
if (!this.mousedover && this.shown) {setTimeout(function () { that.hide(); }, 200);}
}
, click: function (e) {
e.stopPropagation();
e.preventDefault();
this.select();
this.$element.focus();
}
, mouseenter: function (e) {
this.mousedover = true;
this.$menu.find('.active').removeClass('active');
$(e.currentTarget).addClass('active');
}
, mouseleave: function (e) {
this.mousedover = false;
}
};
/* COMBOBOX PLUGIN DEFINITION
* =========================== */
$.fn.combobox = function ( option ) {
return this.each(function () {
var $this = $(this)
, data = $this.data('combobox')
, options = typeof option == 'object' && option;
if(!data) {$this.data('combobox', (data = new Combobox(this, options)));}
if (typeof option == 'string') {data[option]();}
});
};
$.fn.combobox.defaults = {
bsVersion: '3'
, menu: '<ul class="typeahead typeahead-long dropdown-menu"></ul>'
, item: '<li><a href="#"></a></li>'
};
$.fn.combobox.Constructor = Combobox;
}( window.jQuery );
将功能绑定到类＆＃39;组合框＆＃39;
<script>
$(document).ready(function(){
$(\'.combobox\').combobox();
});
</script>
答案 0 :(得分：1)
尝试其他插件，例如：https://github.com/steelheaddigital/jquery.ui.combify
使用它：
<select id="SomeSelect"></select>
$("#SomeSelect").combify()
答案 1 :(得分：0)
第一步是在这里添加一个回报
if (!this.selected && val !== '') {
return; /*
this.$element.val('');
this.$source.val('').trigger('change');
this.$target.val('').trigger('change');
*/
}
然后看看它发生了什么。
然后我做了这个
if (!this.selected && val !== '') {
console.log(val,this.source);
if (this.source.indexOf(val) ==-1) {
this.map[prompt("value to store for "+val+"?",val)]=val;
this.source.push(val)
}
return;
/*
this.$element.val('');
this.$source.val('').trigger('change');
this.$target.val('').trigger('change');
*/
}