KnockoutJS“if:”绑定无法正常工作

时间:2013-10-23 14:47:16

标签: javascript knockout.js

// Model
function User(item) {
  var self = this;
  this.id = ko.observable(item.id);
  this.name = ko.observable(item.name);
  this.surname = ko.observable(item.surname);
  this.email = ko.observable(item.email);
  // item.enabled is a boolean value.
  this.enabled = ko.observable(item.enabled);
  this.credit = ko.observable(new Credit(item.credit));
  this.roles = ko.observableArray(item.roles);
}    

<div data-bind='foreach: users'>
  <!-- This below prints 1 -->
  <span class='badge ' data-bind='text: enabled' ></span>

  <!-- Both of those below don't activate (if check fails) -->
  <span class='badge badge-success' data-bind='if: enabled==1'>OK</span>
  <span class='badge ' data-bind='if: enabled==0' >NO</span>
</div>

我试过了:

<span class='badge badge-success' data-bind='if: enabled==1'>OK</span>
<span class='badge badge-success' data-bind='if: enabled'>OK</span>
<span class='badge badge-success' data-bind='if: enabled()'>OK</span>
<span class='badge badge-success' data-bind='if: enabled=="1"'>OK</span>
没有运气。我做错了什么?

1 个答案:

答案 0 :(得分:1)

你很接近,但正确的语法是

<span class='badge badge-success' data-bind='if: enabled() == 1'>OK</span>
<span class='badge ' data-bind='if: enabled() == 0' >NO</span>

演示JSFiddle

因为enabled是一个可观察的(它是一个函数),所以当你在表达式中使用enabled()时,你需要通过调用它来获取它的值而不需要任何参数:{{1}}。