我正在尝试使用此示例http://jqueryui.com/demos/autocomplete/#combobox。但默认情况下显示空白选项。而不是“选择一个...”。如何解决该问题?
还有一个问题:我不使用“显示底层菜单”按钮,而是在示例中使用。 JS代码中该按钮是否有未使用的PC代码?
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默认情况下显示空白选项。而不是“选择一个...”。如何解决该问题?
发生这种情况的原因是_create
函数中的这段代码:
value = selected.val() ? selected.text() : "";
只需将三元组的假部分更改为“选择一个”:
value = selected.val() ? selected.text() : "Select one...";
这里是修改后的小部件,以供参考:
$.widget( "ui.combobox", {
_create: function() {
var self = this,
select = this.element.hide(),
selected = select.children( ":selected" ),
value = selected.val() ? selected.text() : "Select One...";
var input = this.input = $( "<input>" )
.insertAfter( select )
.val( value )
.autocomplete({
delay: 0,
minLength: 0,
source: function( request, response ) {
var matcher = new RegExp( $.ui.autocomplete.escapeRegex(request.term), "i" );
response( select.children( "option" ).map(function() {
var text = $( this ).text();
if ( this.value && ( !request.term || matcher.test(text) ) )
return {
label: text.replace(
new RegExp(
"(?![^&;]+;)(?!<[^<>]*)(" +
$.ui.autocomplete.escapeRegex(request.term) +
")(?![^<>]*>)(?![^&;]+;)", "gi"
), "<strong>$1</strong>" ),
value: text,
option: this
};
}) );
},
select: function( event, ui ) {
ui.item.option.selected = true;
self._trigger( "selected", event, {
item: ui.item.option
});
},
change: function( event, ui ) {
if ( !ui.item ) {
var matcher = new RegExp( "^" + $.ui.autocomplete.escapeRegex( $(this).val() ) + "$", "i" ),
valid = false;
select.children( "option" ).each(function() {
if ( $( this ).text().match( matcher ) ) {
this.selected = valid = true;
return false;
}
});
if ( !valid ) {
$( this ).val( "" );
select.val( "" );
input.data( "autocomplete" ).term = "";
return false;
}
}
}
})
.addClass( "ui-widget ui-widget-content ui-corner-left" );
input.data( "autocomplete" )._renderItem = function( ul, item ) {
return $( "<li></li>" )
.data( "item.autocomplete", item )
.append( "<a>" + item.label + "</a>" )
.appendTo( ul );
};
this.button = $( "<button type='button'> </button>" )
.attr( "tabIndex", -1 )
.attr( "title", "Show All Items" )
.insertAfter( input )
.button({
icons: {
primary: "ui-icon-triangle-1-s"
},
text: false
})
.removeClass( "ui-corner-all" )
.addClass( "ui-corner-right ui-button-icon" )
.click(function() {
if ( input.autocomplete( "widget" ).is( ":visible" ) ) {
input.autocomplete( "close" );
return;
}
$( this ).blur();
input.autocomplete( "search", "" );
input.focus();
});
},
destroy: function() {
this.input.remove();
this.button.remove();
this.element.show();
$.Widget.prototype.destroy.call( this );
}
});
我不使用“显示基础菜单”按钮,如示例中所示。 JS代码中该按钮是否有未使用的PC代码?
是的,您可以安全地删除该按钮。实际上,您只需要一个select
元素即可初始化小部件。
这里是不带按钮且默认文本为“选择一个...”的组合框的示例:http://jsfiddle.net/andrewwhitaker/MgjRy/