使用Knockout.js更新UI控件

Question

我正在致力於knockout.js，並且是全新的。我從Web API動態獲取數據並綁定到表。代碼是如下：

var RowNumber; 
var viewModel = {}; 
var url_paging = "http://192.192.192.192/api/OLMS/GetOlDetailsByRowNumber?token=" + tokenval + "&rowNumber=1"; 
$(document).on("pageinit", "#grid_page", function() { 
     $.getJSON(url_paging, function (data) { 
       var newLeads = ko.mapping.fromJS(data); 
       viewModel.model = newLeads; 
       RowNumber = data.SequenceNo; 
       ko.applyBindings(viewModel, document.getElementById("oltable"));      
      }); 
}); 

and HTML : 

<table data-bind="attr: { 'id': OLId }" class="zebra-striped" style="margin: 0 auto;"> 
           <tbody> 
            <tr> 
             <td colspan="4" style="height: 30px; font-size: 16px; vertical-align: middle; text-align: center; font-weight: bold;"> 
              OPINION LEADER DETAILS FOR <span data-bind="text: OLFirstName"></span><span data-bind="text: OLMiddleName"></span><span data-bind="text: OLLastName"></span>, <span data-bind="text: Degrees"></span>. 
             </td> 
            </tr> 
            <tr> 
             <td style="width: 10%;"> 
              <img data-bind="attr: {src: 'https://olms.kolonlinemnk.com/Uploads/Mallinckrodt/Photo/1214/' + Photo()}" 
               alt="" style="border: 1px solid #DDD; width: 100px; height: 125px;"> 
             </td> 
             <td style="width: 30%;"> 
              <span data-bind="text: Title"></span> 
              <br /> 
              <span data-bind="text: Department"></span> 
              <br /> 
              <span data-bind="text: Address1"></span> 
              <br /> 
              <span data-bind="text: Address2"></span> 
              <br /> 
              <a class="nounderline" data-bind="attr: {href: 'tel:' + Phone()}"> 
               <span data-bind="text: Phone"></span> 
              </a> 
             </td> 
             <td style="width: 30%;"> 
              Influence: <br /> 
              Category: <br /> 
              Tier: <span data-bind="text: Tier"></span> 
              <br /> 
              Top 25<br /> 
              Type: <br /> 
              Interests: 
             </td> 
             <td style="width: 30%;"> 
              Distance: <br /> 
              Last Interaction:<span style="color: red;"></span><br /> 
              <br /> 
              <a href="mailto:steve.abram@mcwpain.org"> 
               <img class="imagepadding" alt="" src="images/icon-email.png"> 
              </a> 
              <a target="_parent" 
               href="interactionview.html"> 
               <img class="imagepadding" alt="" src="images/icon-addcomment.png"> 
              </a> 
              <a target="_parent" 
               href="pov.html"> 
               <img class="imagepadding" alt="" src="images/icon-statistics.png"> 
              </a> 
              <a target="_parent" href="profile.html"> 
               <img class="imagepadding" alt="" src="images/icon-insertpictureleft.png"> 
              </a> 
              <a target="_parent" href="map_directions.html"> 
               <img class="imagepadding" alt="" src="images/icon-automobile-car.png"> 
              </a> 
             </td> 
            </tr> 
           </tbody> 
          </table> 

現在我有一個和下一個按鈕：

上一頁 下一頁未來的

的onclick應該從數據庫中讀取記錄並顯示在表：

function GetNextOL() { 
       var url_NextOL = "http://192.192.192.192:8080/api/OLMS/GetOlDetailsByRowNumber?token=" + tokenval + "&rowNumber=1" + (RowNumber + 1) ; 
       alert("before"); 
       $.getJSON(url_NextOL, function (data) { 
        var nextOL = ko.mapping.fromJS(data); 
        alert(nextOL); 
        //viewModel.model = nextOL; 
        // var _data = $("oltable"); 
        //ko.cleanNode(_data); 
        //ko.applyBindings(viewModel, document.getElementById("oltable")); 
        ko.mapping.fromJS(nextOL, viewModel); 
       }); 
       alert("after"); 
     }   

我收到以下錯誤：

knockoutjs can not apply bindings multiple times to the same element.

如何使用不同的數據更新相同的用戶界面？

Answer 1

您正在使用映射插件有點不妥，它需要3個PARAMS

ko.mapping.fromJS(data, options, objectToUpdate); 

見例如

http://jsfiddle.net/jk5NF/

Answer 2

你應該叫ko.applyBindings只有一次，而不是在事件處理程序可能會被多次調用。