<div style="text-align: left;background-color: #E0ECFF;padding-left: 10px;padding-top: 5px;"> 
  <div id="searchField" style="width:250px"></div> 
</div> 

 $("#searchField").combobox({ 
  loader: function(param,success,error){ 
    //获取输入的值 
    var q = param.q || ""; 
    //此处q的length代表输入多少个字符后开始查询 
    if(q.length <= 0) return false; 
    var rows = $('#fieldList').datagrid('getRows'); 
    var items = $.map(rows, function (item, index) { 
      //匹配条件，忽略大小写 
      if(item.fieldName && (item.fieldName.toLowerCase().indexOf(q.toLowerCase()) != -1)){ 
        return { 
          "fieldName": item.fieldName 
        }; 
      } 
    }); 
    success(items); 
  }, 
  onBeforeLoad:function () { 
    //设置placeholder 
    $("input[class='textbox-text validatebox-text textbox-prompt']").attr("placeholder","输入标注字段，定位所在行"); 
  }, 
  mode: 'remote', 
  textField:'fieldName', 
  valueField:'fieldName', 
  onSelect : function(record){ 
    var $filedList = $('#fieldList'); 
    var rows = $filedList.datagrid('getRows'); 
    if(rows && rows.length > 0){ 
      for(var r = 0 ; r < rows.length ; r++){ 
        if(rows[r].fieldName == record.fieldName){ 
          $filedList.datagrid('selectRow',r); 
          break; 
        } 
      } 
    } 
  } 
}); 

var rows = $('#fieldList').datagrid('getRows'); 
var items = $.map(rows, function (item, index) { 
  //匹配条件，忽略大小写 
  if(item.fieldName && (item.fieldName.toLowerCase().indexOf(q.toLowerCase()) != -1)){ 
    return { 
      "fieldName": item.fieldName 
    }; 
  } 
}); 

success(items); 

onSelect : function(record){ 
    var $filedList = $('#fieldList'); 
    var rows = $filedList.datagrid('getRows'); 
    if(rows && rows.length > 0){ 
      for(var r = 0 ; r < rows.length ; r++){ 
        if(rows[r].fieldName == record.fieldName){ 
          $filedList.datagrid('selectRow',r); 
          break; 
        } 
      } 
    } 
  }