jquery combobox下拉及异步加载数据
记录：
通常会遇到加载很多条数据到下拉框中，通过ajax的异步加载方法实现，参考jquery ui 官网
定义一个html标签
监控类型加载js和css文件
自定义css样式
.ui-combobox {
position: relative;
display: inline-block;
}
.ui-combobox-toggle {
position: absolute;
top: 0;
bottom: 0;
margin-left: -1px;
padding: 0;
/* adjust styles for IE 6/7 */
*height: 1.7em;
*top: 0.1em;
}
.ui-combobox-input {
margin: 0;
padding: 0.3em;
}/**
* 自定义ui combobox
*/
(function( $ ) {
$.widget( "ui.combobox", {
_create: function() {
var input,
that = this,
select = this.element.hide(),
selected = select.children( ":selected" ),
value = selected.val() ? selected.text() : "",
wrapper = this.wrapper = $( "" )
.addClass( "ui-combobox" )
.insertAfter( select );
function removeIfInvalid(element) {
var value = $( element ).val(),
matcher = new RegExp( "^" + $.ui.autocomplete.escapeRegex( value ) + "$", "i" ),
valid = false;
select.children( "option" ).each(function() {
if ( $( this ).text().match( matcher ) ) {
this.selected = valid = true;
return false;
}
});
if ( !valid ) {
// remove invalid value, as it didn't match anything
$( element )
.val( "" )
.attr( "title", value + " 未找到任何匹配项" )
.tooltip( "open" );
select.val( "" );
setTimeout(function() {
input.tooltip( "close" ).attr( "title", "" );
}, 2500 );
input.data( "autocomplete" ).term = "";
return false;
}
}
input = $( "" )
.appendTo( wrapper )
.val( value )
.attr( "title", "" )
.addClass( "ui-state-default ui-combobox-input" )
.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"
), "$1" ),
value: text,
option: this
};
}) );
},
select: function( event, ui ) {
ui.item.option.selected = true;
that._trigger( "selected", event, {
item: ui.item.option
});
},
change: function( event, ui ) {
if ( !ui.item )
return removeIfInvalid( this );
}
})
.addClass( "ui-widget ui-widget-content ui-corner-left" );
input.data( "autocomplete" )._renderItem = function( ul, item ) {
return $( "" )
.data( "item.autocomplete", item )
.append( "" + item.label + "" )
.appendTo( ul );
};
$( "" )
.attr( "tabIndex", -1 )
.attr( "title", "显示所有" )
.tooltip()
.appendTo( wrapper )
.button({
icons: {
primary: "ui-icon-triangle-1-s"
},
text: false
})
.removeClass( "ui-corner-all" )
.addClass( "ui-corner-right ui-combobox-toggle" )
.click(function() {
// close if already visible
if ( input.autocomplete( "widget" ).is( ":visible" ) ) {
input.autocomplete( "close" );
removeIfInvalid( input );
return;
}
// work around a bug (likely same cause as #5265)
$( this ).blur();
// pass empty string as value to search for, displaying all results
input.autocomplete( "search", "" );
input.focus();
});
input
.tooltip({
position: {
of: this.button
},
tooltipClass: "ui-state-highlight"
});
},
destroy: function() {
this.wrapper.remove();
this.element.show();
$.Widget.prototype.destroy.call( this );
}
});
})( jQuery );
只需在页面加载的时候调用即可，实现了combobox的select事件的使用，同时也兼具了jquery autocomplete combobox的效果；
$(function() {
$("#s_type").combobox({
selected : function(event,ui){
var flag = $("#s_type option:selected").val();//获取当前选中value
if(flag==1){
doSearch();
}
else{
doSearch2();
}
}
});
});效果图：
实现异步加载数据的代码：
function loadCombobox(obj1,obj2){
//加载autocomplete
$.ajax({
type : "POST",
url : url地址,
dataType : "json",
cache : false,
async : false,
data : {
"param1" : 输入的字符参数,
},
success : function(json) {
var data = eval(json);//json数组
var optionStr = '';
for (var i = 0; i < data.length; i++) {
optionStr += "";
}
$("#" + obj2).html("" + optionStr);
}
});
$("#"+obj2).combobox();
}; //用于异步ajax加载线路下拉列表
String param1 = URLDecoder.decode(request.getParameter("param1") == null ? "-1" : request.getParameter("param1").trim(), "utf-8");
JSONArray jsonArray = new JSONArray();
JSONObject jsonObject = new JSONObject();
BaseService service = new BaseService();
List list = service.getlist(Long.parseLong(param1));
if (list != null)
{
for (int i = 0; i < list.size(); i++)
{
Table t = (Table)list.get(i);
jsonObject.put("id", t.getId());
jsonObject.put("name", t.getName());
jsonArray.add(jsonObject);
}
}
PrintWriter pw = null;
StringBuffer sb = new StringBuffer();
sb.append(jsonArray.toString());
try
{
response.setContentType("text/html;charset=GBK");
pw = response.getWriter();
pw.write(sb.toString());
pw.close();
}
catch (IOException e)
{
e.printStackTrace();
}效果同上