Coolite的Combobox智能检索应用指南

下面是演示效果，请欣赏.


通过在输入区中输入要筛选的内容，将会自动匹配出你要找的记录.
但对于我们赛选条件更复杂的记录，该如何找寻呢? 我们可以点击右侧的"..."
接着就会出现下图

只要左键点击记录，此记录就会返回到之前的输入框中.

我们来看看代码如何实现
首先是Hander文件,做出处理自动检索的后台服务方法，
通过传递过来的筛选条件，调用做好的分页方法，去过滤出记录..

 

 1    [WebService(Namespace = "http://tempuri.org/")]
 2     [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
 3     public class HospitalHandler : IHttpHandler
 4     {
 5 
 6         public void ProcessRequest(HttpContext context)
 7         {
 8             context.Response.ContentType = "text/plain";
 9             int start = 0;
10             int limit = 10;
11             string sort = string.Empty;
12             string dir = string.Empty;
13             string query = string.Empty;
14 
             if (!string.IsNullOrEmpty(context.Request["start"]))
16             {
17                 start = int.Parse(context.Request["start"]);
18             }
19 
             if (!string.IsNullOrEmpty(context.Request["limit"]))
21             {
22                 limit = int.Parse(context.Request["limit"]);
23             }
24 
             if (!string.IsNullOrEmpty(context.Request["sort"]))
26             {
27                 sort = context.Request["sort"];
28             }
29 
             if (!string.IsNullOrEmpty(context.Request["dir"]))
31             {
32                 dir = context.Request["dir"];
33             }
34 
             if (!string.IsNullOrEmpty(context.Request["query"]))
36             {
37                 query = context.Request["query"];
38             }
39             string strwhere = "";
40             int count;
41             if (query != "*")
42             {
43                 strwhere = "FullName like '%" + query + "%'";
44             }
45 
             List<V_HospitalInfo> hospitals = V_HospitalController.Current.GetPaged(strwhere, "FullName  ASC", start, limit, out count);
47             context.Response.Write(string.Format("{{totalCount:{1},'datas':{0}}}", JSON.Serialize(hospitals), count));
48 
         }
50 
         public bool IsReusable
52         {
53             get
             {
55                 return false;
56             }
57         }
58     }
59 
 

然后是前台的代码

<ext:Store runat="server" AutoLoad="false" ID="stoHospital"> 
            <Reader> 
            <ext:JsonReader Root="datas" TotalProperty="totalCount"> 
            <Fields> 
            <ext:RecordField Name="HospitalID" /> 
            <ext:RecordField Name="FullName" /> 
            <ext:RecordField Name="CityText" /> 
            <ext:RecordField Name="AreaText" /> 
           
            </Fields> 
            </ext:JsonReader> 
            </Reader> 
        </ext:Store> 

看过Coolite的Custom Search范例的可能会问了，ext:HttpProxy 怎么没写？
其实本人是在DNN框架下使用的,所以这个文件的定位我写到了.cs代码中

HttpProxy httpProxy = new HttpProxy();
                httpProxy.Url = this.ModulePath + "http://www.cnblogs.com/VAP.Modules.Hospital/VAP.Modules.Hospital.HospitalAccount/HospitalHandler.ashx";
                httpProxy.Method = HttpMethod.POST;
                this.stoHospital.Proxy.Add(httpProxy);
                stoHospital.DataBind();

当然，如果每此必要，你也可以像官网范例中，直接写上如。

<ext:Store runat="server" ID="Store1">
            <Proxy>
                <ext:HttpProxy Method="POST" Url="Plants.ashx" />
            </Proxy>

下面是Combobox的代码

Code
<script type="text/javascript">
        var PopupSelectHospital = function(combobox,hidfield)
    {
    openHospital(combobox,hidfield);
    }
        
  </script>
<style type="text/css">
        .search-item {
            font: normal 11px tahoma, arial, helvetica, sans-serif;
            padding: 3px 10px 3px 10px;
            border: 1px solid #fff;
            border-bottom: 1px solid #eeeeee;
            white-space: normal;
            color: #555;
        }
        
        .search-item h3 {
            display: block;
            font: inherit;
            font-weight: bold;
            color: #222;
        }

        .search-item h3 span {
            float: right;
            font-weight: normal;
            margin: 0 0 5px 5px;
            width: 180px;
            display: block;
            clear: none;
        } 
        
        p { width: 650px; }
        
        .ext-ie .x-form-text { position: static !important; }
    </style>
<ext:Hidden runat="server" ID="hidHospital"></ext:Hidden>
<ext:ComboBox
                     ID="cboHospital" 
                      runat="server"
                      FieldLabel="医院"
                       StoreID="stoHospital"
                        DisplayField="FullName" 
                        ValueField="HospitalID"
                         TypeAhead="true" 
                         LoadingText="查找中"
                        PageSize="10"
                        ItemSelector="div.search-item"        
                        MinChars="0" >
                        <Template>
                        <tpl for=".">
                              <div class="search-item">
                                 <h3><span>城市:{CityText}</span>{FullName}</h3>
                                    地区:{AreaText}
                              </div>
                            </tpl>
                        </Template>
                            <Triggers>
                                <ext:FieldTrigger Icon="Clear" HideTrigger="true" />
                                <ext:FieldTrigger Icon="Ellipsis" Qtip="选择医院" />
                            </Triggers>
                            <Listeners>
                                <Select Handler="this.triggers[0].show();" />
                                <Blur Handler="#{hidHospital}.setValue(this.getValue());" />
                                <BeforeQuery Handler="this.triggers[0][ this.getRawValue().toString().length == 0 ? 'hide' : 'show']();" />
                                <TriggerClick Handler="if(index == 0) {this.clearValue();#{hidHospital}.setValue('');this.triggers[0].hide(); }else if(index==1){PopupSelectHospital(this,#{hidHospital});}" />
                            </Listeners>
                    </ext:ComboBox>

要点
1.建立了两个Trigger,一个处理清空内容(所检索到的记录或者弹出查找到的记录), 另一个就是弹出新页面检索记录.
  Listeners几个事件就是针对是否隐藏"清空"按键的判断逻辑
2.仔细看，有一个ext:Hiddren, 真是一个关键点，其实本来根本没必要使用多一个Hiddren, 因为Combobox中的，Value和Text,就可以分别对应
一个显示值，和一个实际值，。。  我们从检索的下来框中选中的记录，也可以直接回填上这两个值，   但是实际上，我们使用SetValue想手动赋值给Combobox
值和显示值时，就发现，Value和Text都会被设置成同样的一个内容,我们不可能单独的修改掉其中一个,我们回传给检索框变得困难了，这使的应用起来相当麻烦.
google上也找到一些Ext下的偏门，但是本人没有试成功，所以，干脆，就用一个Hiddren单独存放这种实际值，再在一些Listeners中把值传递给Hiddren.

好的，我们看看.cs代码.

读取时：

if (objPolicy.HospitalID != Null.NullGuid)
            {

                hidHospital.Value = objPolicy.HospitalID.ToString();
                cboHospital.SetValue(objPolicy.HospitalFullname);
                cboHospital.ShowTrigger(0);
            }
            else
            {
                cboHospital.ConcealTrigger(0);
                cboHospital.Triggers[0].HideTrigger = true;
                cboHospital.SetValue("");
                
            }

ShowTrigger是显示Trigger,
ConcealTrigger是隐藏Trigger,
这个是隐藏那个"清空"的
更新时:

if (!string.IsNullOrEmpty(this.hidHospital.Value.ToString()))
            {
                objPolicy.HospitalID = new Guid(this.hidHospital.Value.ToString());
            }
            else
            {
                objPolicy.HospitalID = Null.NullGuid;
            }

下面是弹出的window代码

<script type="text/javascript">
    var hidCtrl;
    var hidID;
    var openHospital = function (Ctrl,Hid) {
        hidCtrl=Ctrl;
        hidID=Hid;
        var window = <%= HospitalWindow.ClientID %>;
        window.show();
    }
    
    
    var cellclickHospital = function (grid , rowIndex,columnIndex, e) {
        var columnId = grid.getColumnModel().getColumnId(columnIndex); // Get column id
        var record = grid.getStore().getAt(rowIndex);  // Get the Record
        if (columnId != 'EditColumn')
        {
            <%= HospitalWindow.ClientID %>.hide(null);
            hidCtrl.setValue(record.data['FullName']);
            hidID.setValue(record.data['HospitalID']);
            
            hidCtrl.triggers[0].show();   
        }
    }

</script>


GridPanel中写入
    <Listeners>
    <CellClick Fn="cellclickHospital"/>
    </Listeners>

到这，就能实现一个功能健全的自动检索了

原文：http://www.cnblogs.com/DNNCenter/archive/2009/07/30/1535036.html