您要查找的内容类似于 jquery Ui 的组合框。如何在您的软件中实现这一点可以通过多种方式完成，但这里有一个：
制作组合框小部件
Yii2 带有多个 jquery-ui 小部件。这第一步是install JUI for Yii2
完成此操作后，您将可以访问所有这些小部件。但是没有组合框小部件（只有一个标准的自动完成）。没关系，我们仍然可以使用此插件中的资源。
为小部件制作 AssetBundle
创建一个ComboboxAssetBundle.php 文件，将其放入assets 文件夹。应该如下（这是advanced template 和frontend 入口点的示例）：
namespace frontend\assets;
use yii\web\AssetBundle;
class ComboboxAssetBundle extends AssetBundle
{
public $sourcePath = '@frontend/assets';
public $css = [
];
public $js = [
'js/combobox.js', // Lets load your custom JS
];
public $depends = [
'yii\web\JqueryAsset', // requires Jquery
'yii\jui\JuiAsset', // requires JUI
];
}
您的 @frontend/assets/js/combobox.js 文件应包含组合框 js 代码：
(function( $ ) {
$.widget( "custom.combobox", {
_create: function() {
this.wrapper = $( "<span>" )
.addClass( "custom-combobox" )
.insertAfter( this.element );
this.element.hide();
this._createAutocomplete();
this._createShowAllButton();
},
_createAutocomplete: function() {
var selected = this.element.children( ":selected" ),
value = selected.val() ? selected.text() : "";
this.input = $( "<input>" )
.appendTo( this.wrapper )
.val( value )
.attr( "title", "" )
.addClass( "custom-combobox-input ui-widget ui-widget-content ui-state-default ui-corner-left" )
.autocomplete({
delay: 0,
minLength: 0,
source: $.proxy( this, "_source" )
})
.tooltip({
tooltipClass: "ui-state-highlight"
});
this._on( this.input, {
autocompleteselect: function( event, ui ) {
ui.item.option.selected = true;
this._trigger( "select", event, {
item: ui.item.option
});
},
autocompletechange: "_removeIfInvalid"
});
},
_createShowAllButton: function() {
var input = this.input,
wasOpen = false;
$( "<a>" )
.attr( "tabIndex", -1 )
.attr( "title", "Show All Items" )
.tooltip()
.appendTo( this.wrapper )
.button({
icons: {
primary: "ui-icon-triangle-1-s"
},
text: false
})
.removeClass( "ui-corner-all" )
.addClass( "custom-combobox-toggle ui-corner-right" )
.mousedown(function() {
wasOpen = input.autocomplete( "widget" ).is( ":visible" );
})
.click(function() {
input.focus();
// Close if already visible
if ( wasOpen ) {
return;
}
// Pass empty string as value to search for, displaying all results
input.autocomplete( "search", "" );
});
},
_source: function( request, response ) {
var matcher = new RegExp( $.ui.autocomplete.escapeRegex(request.term), "i" );
response( this.element.children( "option" ).map(function() {
var text = $( this ).text();
if ( this.value && ( !request.term || matcher.test(text) ) )
return {
label: text,
value: text,
option: this
};
}) );
},
_removeIfInvalid: function( event, ui ) {
// Selected an item, nothing to do
if ( ui.item ) {
return;
}
// Search for a match (case-insensitive)
var value = this.input.val(),
valueLowerCase = value.toLowerCase(),
valid = false;
this.element.children( "option" ).each(function() {
if ( $( this ).text().toLowerCase() === valueLowerCase ) {
this.selected = valid = true;
return false;
}
});
// Found a match, nothing to do
if ( valid ) {
return;
}
// Remove invalid value
this.input
.val( "" )
.attr( "title", value + " didn't match any item" )
.tooltip( "open" );
this.element.val( "" );
this._delay(function() {
this.input.tooltip( "close" ).attr( "title", "" );
}, 2500 );
this.input.autocomplete( "instance" ).term = "";
},
_destroy: function() {
this.wrapper.remove();
this.element.show();
}
});
})( jQuery );
制作小部件
现在您需要创建小部件。为了与上述保持一致，让我们使用以下内容创建一个@frontend/widgets/Combobox.php 文件：
namespace frontend\widgets;
use yii\base\Widget;
use frontend\assets\ComboboxAssetBundle;
use yii\base\InvalidConfigException;
use yii\helpers\Html;
use yii\helpers\ArrayHelper;
use Yii;
class Combobox extends Widget
{
/**
* @var form object if desired
*/
public $form;
/**
* @var model object tu use
*/
public $model;
/**
* @var model attribute this dropdown is for.
*/
public $attribute;
/**
* @var options for the dropdown.
*/
public $options = [];
/**
* @var items for the dropdown list.
*/
public $items = [];
public function init()
{
if(!isset($this->attribute))
{
throw new InvalidConfigException("an attribute is required");
}
}
public function run()
{
//register your asset:
ComboboxAssetBundle::register(Yii::$app->view);
Yii::$app->view->registerJs('$( ".combobox" ).combobox();');
//add a class to the options
$options = ArrayHelper::merge($this->options, ['class'=>'combobox']);
if(isset($this->form))
{
return $this->form->field($this->model, $this->attribute)->dropDownList($this->items, $options);
}
elseif(isset($this->model))
{
return Html::activeDropDownList($this->model, $this->attribute, $this->items, $options);
}
else
{
return Html::dropDownList($this->attribute, NULL, $this->items, $options);
}
}
}
调用小部件
有了这个，您应该能够使用Combobox::widget([]) 调用小部件，如下所示：
<?= Combobox::widget([
'form' => $form,
'model' => $model,
'attribute' => 'doctor_name',
'items' => ArrayHelper::map(\app\models\Doctor::find()->all(), 'id', 'doctor_name' ),
'options' => [ 'prompt' => 'Please Select' ]) ?>
我没有对此进行测试，但应该有足够的信息让您轻松地让它工作。这样做的好处是您可以在应用程序的任何地方重复使用这种类型的下拉菜单。
如果您需要任何额外信息，请告诉我。
编辑：
有时您需要让您的应用强制复制您的资产，否则您将看不到任何更改。有很多方法可以执行/配置此操作，但在您的开发环境中本地执行我发现最简单的方法是将以下内容添加到您的 local 配置文件中：
'components' => [
//...
'assetManager' => [
'forceCopy' => TRUE,
]
],