我正在使用非常棒的 jQuery 多选插件，ASM select
这个插件非常接近我的需求，我必须尝试修复我能找到的唯一一个错误。
在初始加载时，选择器会检查是否有任何具有“selected”属性的元素并选择它们。这很好，除非没有任何东西具有“selected”属性，否则它会选择第一个。
我怎样才能阻止它这样做？我不希望最初选择的任何内容都为 9/10 次，这将是错误的选项。
我不是 jQuery 编码员，我浏览了代码，发现了一些构建第一个选择项的引用资料，并对它们进行了摆弄，但没有取得任何成功。
我通常不这样做，但我完全不知道从哪里开始，这里是插件的代码。
/*
* Alternate Select Multiple (asmSelect) 1.0.4a beta - jQuery Plugin
* http://www.ryancramer.com/projects/asmselect/
*
* Copyright (c) 2009 by Ryan Cramer - http://www.ryancramer.com
*
* Dual licensed under the MIT (MIT-LICENSE.txt)
* and GPL (GPL-LICENSE.txt) licenses.
*
*/
(function($) {
$.fn.asmSelect = function(customOptions) {
var options = {
listType: 'ol', // Ordered list 'ol', or unordered list 'ul'
sortable: false, // Should the list be sortable?
highlight: false, // Use the highlight feature?
animate: false, // Animate the the adding/removing of items in the list?
addItemTarget: 'bottom', // Where to place new selected items in list: top or bottom
hideWhenAdded: false, // Hide the option when added to the list? works only in FF
debugMode: false, // Debug mode keeps original select visible
removeLabel: 'remove', // Text used in the "remove" link
highlightAddedLabel: 'Added: ', // Text that precedes highlight of added item
highlightRemovedLabel: 'Removed: ', // Text that precedes highlight of removed item
containerClass: 'asmContainer', // Class for container that wraps this widget
selectClass: 'asmSelect', // Class for the newly created <select>
optionDisabledClass: 'asmOptionDisabled', // Class for items that are already selected / disabled
listClass: 'asmList', // Class for the list ($ol)
listSortableClass: 'asmListSortable', // Another class given to the list when it is sortable
listItemClass: 'asmListItem', // Class for the <li> list items
listItemLabelClass: 'asmListItemLabel', // Class for the label text that appears in list items
removeClass: 'asmListItemRemove', // Class given to the "remove" link
highlightClass: 'asmHighlight' // Class given to the highlight <span>
};
$.extend(options, customOptions);
return this.each(function(index) {
var $original = $(this); // the original select multiple
var $container; // a container that is wrapped around our widget
var $select; // the new select we have created
var $ol; // the list that we are manipulating
var buildingSelect = false; // is the new select being constructed right now?
var ieClick = false; // in IE, has a click event occurred? ignore if not
var ignoreOriginalChangeEvent = false; // originalChangeEvent bypassed when this is true
function init() {
// initialize the alternate select multiple
// this loop ensures uniqueness, in case of existing asmSelects placed by ajax (1.0.3)
while($("#" + options.containerClass + index).size() > 0) index++;
$select = $("<select></select>")
.addClass(options.selectClass)
.attr('name', options.selectClass + index)
.attr('id', options.selectClass + index);
$selectRemoved = $("<select></select>");
$ol = $("<" + options.listType + "></" + options.listType + ">")
.addClass(options.listClass)
.attr('id', options.listClass + index);
$container = $("<div></div>")
.addClass(options.containerClass)
.attr('id', options.containerClass + index);
buildSelect();
$select.change(selectChangeEvent)
.click(selectClickEvent);
$original.change(originalChangeEvent)
.wrap($container).before($select).before($ol);
if(options.sortable) makeSortable();
if($.browser.msie && $.browser.version < 8) $ol.css('display', 'inline-block'); // Thanks Matthew Hutton
}
function makeSortable() {
// make any items in the selected list sortable
// requires jQuery UI sortables, draggables, droppables
$ol.sortable({
items: 'li.' + options.listItemClass,
handle: '.' + options.listItemLabelClass,
axis: 'y',
update: function(e, data) {
var updatedOptionId;
$(this).children("li").each(function(n) {
$option = $('#' + $(this).attr('rel'));
if($(this).is(".ui-sortable-helper")) {
updatedOptionId = $option.attr('id');
return;
}
$original.append($option);
});
if(updatedOptionId) triggerOriginalChange(updatedOptionId, 'sort');
}
}).addClass(options.listSortableClass);
}
function selectChangeEvent(e) {
// an item has been selected on the regular select we created
// check to make sure it's not an IE screwup, and add it to the list
if($.browser.msie && $.browser.version < 7 && !ieClick) return;
var id = $(this).children("option:selected").slice(0,1).attr('rel');
addListItem(id);
ieClick = false;
triggerOriginalChange(id, 'add'); // for use by user-defined callbacks
}
function selectClickEvent() {
// IE6 lets you scroll around in a select without it being pulled down
// making sure a click preceded the change() event reduces the chance
// if unintended items being added. there may be a better solution?
ieClick = true;
}
function originalChangeEvent(e) {
// select or option change event manually triggered
// on the original <select multiple>, so rebuild ours
if(ignoreOriginalChangeEvent) {
ignoreOriginalChangeEvent = false;
return;
}
$select.empty();
$ol.empty();
buildSelect();
// opera has an issue where it needs a force redraw, otherwise
// the items won't appear until something else forces a redraw
if($.browser.opera) $ol.hide().fadeIn("fast");
}
function buildSelect() {
// build or rebuild the new select that the user
// will select items from
buildingSelect = true;
// add a first option to be the home option / default selectLabel
$select.prepend("<option>" + $original.attr('title') + "</option>");
$original.children("option").each(function(n) {
var $t = $(this);
var id;
if(!$t.attr('id')) $t.attr('id', 'asm' + index + 'option' + n);
id = $t.attr('id');
if($t.is(":selected")) {
addListItem(id);
addSelectOption(id, true);
} else {
addSelectOption(id);
}
});
if(!options.debugMode) $original.hide(); // IE6 requires this on every buildSelect()
selectFirstItem();
buildingSelect = false;
}
function addSelectOption(optionId, disabled) {
// add an <option> to the <select>
// used only by buildSelect()
if(disabled == undefined) var disabled = false;
var $O = $('#' + optionId);
var $option = $("<option>" + $O.text() + "</option>")
.val($O.val())
.attr('rel', optionId);
if(disabled) disableSelectOption($option);
$select.append($option);
}
function selectFirstItem() {
// select the firm item from the regular select that we created
$select.children(":eq(0)").attr("selected", true);
}
function disableSelectOption($option) {
// make an option disabled, indicating that it's already been selected
// because safari is the only browser that makes disabled items look 'disabled'
// we apply a class that reproduces the disabled look in other browsers
$option.addClass(options.optionDisabledClass)
.attr("selected", false)
.attr("disabled", true);
if(options.hideWhenAdded) $option.hide();
if($.browser.msie) $select.hide().show(); // this forces IE to update display
}
function enableSelectOption($option) {
// given an already disabled select option, enable it
$option.removeClass(options.optionDisabledClass)
.attr("disabled", false);
if(options.hideWhenAdded) $option.show();
if($.browser.msie) $select.hide().show(); // this forces IE to update display
}
function addListItem(optionId) {
// add a new item to the html list
var $O = $('#' + optionId);
if(!$O) return; // this is the first item, selectLabel
var $removeLink = $("<a></a>")
.attr("href", "#")
.addClass(options.removeClass)
.prepend(options.removeLabel)
.click(function() {
dropListItem($(this).parent('li').attr('rel'));
return false;
});
var $itemLabel = $("<span></span>")
.addClass(options.listItemLabelClass)
.html($O.html());
var $item = $("<li></li>")
.attr('rel', optionId)
.addClass(options.listItemClass)
.append($itemLabel)
.append($removeLink)
.hide();
if(!buildingSelect) {
if($O.is(":selected")) return; // already have it
$O.attr('selected', true);
}
if(options.addItemTarget == 'top' && !buildingSelect) {
$ol.prepend($item);
if(options.sortable) $original.prepend($O);
} else {
$ol.append($item);
if(options.sortable) $original.append($O);
}
addListItemShow($item);
disableSelectOption($("[rel=" + optionId + "]", $select));
if(!buildingSelect) {
setHighlight($item, options.highlightAddedLabel);
selectFirstItem();
if(options.sortable) $ol.sortable("refresh");
}
}
function addListItemShow($item) {
// reveal the currently hidden item with optional animation
// used only by addListItem()
if(options.animate && !buildingSelect) {
$item.animate({
opacity: "show",
height: "show"
}, 100, "swing", function() {
$item.animate({
height: "+=2px"
}, 50, "swing", function() {
$item.animate({
height: "-=2px"
}, 25, "swing");
});
});
} else {
$item.show();
}
}
function dropListItem(optionId, highlightItem) {
// remove an item from the html list
if(highlightItem == undefined) var highlightItem = true;
var $O = $('#' + optionId);
$O.attr('selected', false);
$item = $ol.children("li[rel=" + optionId + "]");
dropListItemHide($item);
enableSelectOption($("[rel=" + optionId + "]", options.removeWhenAdded ? $selectRemoved : $select));
if(highlightItem) setHighlight($item, options.highlightRemovedLabel);
triggerOriginalChange(optionId, 'drop');
}
function dropListItemHide($item) {
// remove the currently visible item with optional animation
// used only by dropListItem()
if(options.animate && !buildingSelect) {
$prevItem = $item.prev("li");
$item.animate({
opacity: "hide",
height: "hide"
}, 100, "linear", function() {
$prevItem.animate({
height: "-=2px"
}, 50, "swing", function() {
$prevItem.animate({
height: "+=2px"
}, 100, "swing");
});
$item.remove();
});
} else {
$item.remove();
}
}
function setHighlight($item, label) {
// set the contents of the highlight area that appears
// directly after the <select> single
// fade it in quickly, then fade it out
if(!options.highlight) return;
$select.next("#" + options.highlightClass + index).remove();
var $highlight = $("<span></span>")
.hide()
.addClass(options.highlightClass)
.attr('id', options.highlightClass + index)
.html(label + $item.children("." + options.listItemLabelClass).slice(0,1).text());
$select.after($highlight);
$highlight.fadeIn("fast", function() {
setTimeout(function() { $highlight.fadeOut("slow"); }, 50);
});
}
function triggerOriginalChange(optionId, type) {
// trigger a change event on the original select multiple
// so that other scripts can pick them up
ignoreOriginalChangeEvent = true;
$option = $("#" + optionId);
$original.trigger('change', [{
'option': $option,
'value': $option.val(),
'id': optionId,
'item': $ol.children("[rel=" + optionId + "]"),
'type': type
}]);
}
init();
});
};
})(jQuery);
希望有人能解决这个问题。
蒂姆
最佳答案
看来不是这个插件的错，而是操作者……我的错
<select multiple name="options[]" id="optionsSelect">
未能指定 multiple 属性会导致 ASM select 简单地将选择框视为普通选择框，当然，该选择框始终会选择一个选项。
呵呵。
我想该 sleep 了。
关于jquery - 删除 jQuery ASM select 中的初始选定项，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/3352018/