失败：无法读取未定义的属性（量角器）

Question

 //get count of checked checkboxes, 
//count must be 1 because it selected one product 
        var checkedCount = productPage.selectedProducts.count(); 
        expect(checkedCount).toBe(1).then(function() { 
         browser.sleep(2222); 
         productDialogPage. createTaskButton.click(); 
        }); 

这是我的代码。当用户选择时，createtaskbutton被激活。

通常它被禁用。

误差

Failed: Cannot read property 'then' of undefined Stack: TypeError: Cannot read property 'then' of undefined

当我改变这个

//get count of checked checkboxes, count must 1 be because it selected one product 
       var checkedCount = productPage.selectedProducts.count(); 
       expect(checkedCount).toBe(1); 
       browser.sleep(4222); 


       //click task create and expect confirm dialog to be displyed 
       productDialogPage.createTaskButton.click(); 



same 

Message: Failed: Cannot read property 'click' of undefined Stack: TypeError: Cannot read property 'click' of undefined

它亘古不变的阅读我的规范类，它一旦进入去另一个规范。

也出于同样

  //get count of checked checkboxes, count must 1 be because it selected one product 
      var checkedCount = productPage.selectedProducts.count(); 
      expect(checkedCount).toBe(1); 
      browser.sleep(4222); 



      browser.wait(function() { 
       return productDialogPage.createTaskButton.isPresent(); 
      }) 

Answer 1

1. expect(actual).toBe(expected)不是thenable，因为它不返回的承诺。
2. 看来，你应该尝试ExpectedConditions

---

var EC = ExpectedConditions; 

//get count of checked checkboxes, 
//count must be 1 because it selected one product 
var checkedCount = productPage.selectedProducts.count(); 
expect(checkedCount).toBe(1); 

browser.wait(EC.elementToBeClickable(productDialogPage.createTaskButton, 4222)); 

//click task create and expect confirm dialog to be displyed 
productDialogPage.createTaskButton.click(); 

Answer 2

对我来说ExpectedConditions（http://www.protractortest.org/#/api?view=ProtractorExpectedConditions.prototype.elementToBeClickable）的帮助下，之前看到答案。你必须解决承诺。希望能帮助到你！ :-)

productPage.selectedProducts.count().then(function(countOfSelectedProducts) { 
      expect(countOfSelectedProducts).toBe(1); 
      }); 
     }); 

// and then wait till your TaskButton is enabled via ExpectedConditions.elementToBeClickable 

var EC = protractor.ExpectedConditions; 

browser.wait(EC.elementToBeClickable(productDialogPage.element.createTaskButton()), 10000).then(function() { 
     productDialogPage.element.createTaskButton.click(); 
});