Uncaught (in promise) ReferenceError: Unable to process binding "text: function(){return 'selection is: '+val }" Message: val is not defined

Question

VM11347:3 Uncaught (in promise) ReferenceError: Unable to process binding "text: function(){return 'selection is: '+val }" 消息：val 没有定义

employee.js

define(['ojs/ojcore','knockout'],
function(oj,ko)
{  
  function AboutViewModel()
  {
      var self=this;
      self.val= ko.observable('nothing selected');
       document.getElementById('globalBody').addEventListener('selectionUpdate',selectionHandler,false);

       function selectionHandler(event)
       {
            self.val(event.detail.data);

       }

  }
});


employee.html

<div class="oj-hybrid-padding"> 
<h1>Employee Content</h1>
<div>
    <oj-bind-text value="[['selection is: '+val]]"></oj-bind-text>
    <h2> <input data-bind="value:val"></input></h2>
</div>
</div>

Answer 1

您已定义 AboutViewModel，但尚未从您的定义块返回任何内容。在 AboutViewModel 函数结束后添加：

return new AboutViewModel();

Answer 2

employee.js


   function selectionHandler(event)
   {
        self.val('selection is: '+event.detail.data);

   }

employee.html

<oj-bind-text value="[[$data.val]]"></oj-bind-text>
<h2> <input data-bind="value:val"></input></h2>

嗨，

您不能在同一个 jet 中同时进行硬编码和返回值。为此，您可以在 js 本身中设置值时定义它。