DELETE 后触发 GET 请求

问题描述 投票:0回答:2

我第一次在 django 中创建一个 Web 应用程序,其中一个功能是添加和编辑职位空缺。使用表单和 POST 方法添加一些信息(职位空缺的标题、描述等),并使用 Fetch api(职责、优惠、优势)在 DOM 和数据库中动态添加和删除其他字段。

加载编辑职位空缺视图时,会从数据库中预加载职责、优惠和优势以及表单数据。

当尝试从编辑职位空缺视图中删除预加载的职责、优惠和优势时,就会出现问题。当我发送 DELETE 请求时,某些内容会在编辑视图中触发 GET,导致所有内容重新加载。这并不理想,因为所有以前的用户输入都消失了。

这只发生在编辑视图中,新的空缺视图按预期工作,添加和删除动态字段而无需刷新页面。

如何防止来自已删除任务的 DELETE 请求在编辑时触发 GET?为什么会发生这种情况?

视频演示:

预期行为链接(在添加新职位空缺时有效。添加和删除项目无需刷新。日志按预期显示 PUT 和 DELETE 请求。):

bug: link(页面当前在编辑视图中的行为方式。删除项目后页面刷新。DELETE 请求后紧跟着不需要的 GET 请求):

编辑views.py:

@login_required(login_url="/login")
def edit(request,id):
    if request.method =="POST":
        vacancy = Vacancy.objects.get(pk=id)

        newtitle = request.POST['title']
        newcity = request.POST['city']
        newcountry = request.POST['country']
        newimage = request.FILES.get('image')
        newdescription = request.POST['description']

        vacancy.title = newtitle
        vacancy.city = newcity
        vacancy.country = newcountry
        vacancy.description = newdescription

        if newimage:
            vacancy.image = newimage

        vacancy.save()

        if vacancy.image:
            return HttpResponseRedirect(reverse("dashboard"))
        else:
            return render(request,'app/cms-edit.html',{
                'vacancy': vacancy,
                'imagemessage': 'Please add an image'
            })
        
    if request.method=="GET":
        vacancy = Vacancy.objects.get(pk=id)
        title = vacancy.title
        city = vacancy.city
        country = vacancy.country
        description = vacancy.description
        image = vacancy.image
        
        duties = Duty.objects.filter(vacancy=vacancy)
        offers = Offer.objects.filter(vacancy=vacancy)
        advantages = Advantage.objects.filter(vacancy=vacancy)
        
        return render(request,'app/cms-edit.html',{
            'vacancy': vacancy,
            'duties':duties,
            'offers':offers,
            'advantages':advantages,
        })

删除职责视图.py:

@csrf_exempt   
def removeduty(request,id):
    duty = Duty.objects.get(pk=id)
    if request.method == "DELETE":
        duty.delete()
        return JsonResponse({"message":"duty deleted"})
    else:
        return JsonResponse({"message":"duty not deleted"})

删除职责 javascript

//remove duty
    function removeduty(dutyid) {
        let csrftoken = getCookie('csrftoken');
        let parent = document.getElementById(`dutyitem-${dutyid}`);
        parent.remove()
    
        fetch(`removeduty/${dutyid}`, {
            method: 'DELETE',
            headers: { "X-CSRFToken": csrftoken }
        })
        .then(response => response.json())
        .then(result => {
            console.log(result.message);

        })
        .catch(error => {
            console.error('Error deleting duty:', error);
        });
    }

编辑职位空缺html的相关部分

<div id="dutysection" class="dutyitems">
            {% if duties %}
            {% for duty in duties%}
              <div class="cms-added-item" id="dutyitem-{{duty.id}}">
                <p class="cms-added-list-item">{{duty.text}}</p>
                <div class="action-wrap-app">
                  <a href="" class="trash-icon w-inline-block" onclick ="removeduty({{duty.id}})">
                    <div class="delete w-embed"><svg width="auto" height="32" viewbox="0 0 36 39" fill="none" xmlns="http://www.w3.org/2000/svg">
                        <path d="M12.0841 29.526L18.0363 23.4738L24.0504 29.526L26.8744 26.6641L20.9102 20.5999L26.8744 14.5358L24.0504 11.6619L18.0363 17.726L12.0841 11.6619L9.22219 14.5358L15.2124 20.5999L9.22219 26.6641L12.0841 29.526ZM6.87654 38.8597C5.85041 38.8597 4.94768 38.4732 4.16834 37.7002C3.38904 36.9272 2.99939 36.0253 2.99939 34.9945V6.51948H0.746094V2.65428H11.157V0.798828H24.8657V2.65428H35.2765V6.51948H33.0233V34.9945C33.0233 36.0253 32.6356 36.9272 31.8603 37.7002C31.085 38.4732 30.1802 38.8597 29.1461 38.8597H6.87654Z" fill="currentColor"></path>
                      </svg></div>
                  </a>
                </div>
              </div>
            {% endfor%}
            {% else %}
            {% endif %}
          </div>

相关网址模式

    path("edit/<int:id>",views.edit,name="edit"),
    path("edit/addduty/<int:id>",views.addduty,name="addduty"),
    path("edit/removeduty/<int:id>",views.removeduty,name="removeduty"),
    path("edit/addoffer/<int:id>",views.addoffer,name="addoffer"),
    path("edit/removeoffer/<int:id>",views.removeoffer,name="removeoffer"),
    path("edit/addadvantage/<int:id>",views.addadvantage,name="addadvantage"),
    path("edit/removeadvantage/<int:id>",views.removeadvantage,name="removeadvantage"),

以下是removeduty函数运行时发生的情况的日志。您可以看到它在编辑时触发 GET,导致其刷新。但为什么?

[2023年8月7日09:03:47]“删除/edit/removeduty/202 HTTP/1.1”200 27

[2023年8月7日09:03:47]“获取/编辑/250 HTTP/1.1”200 8895

编辑:我尝试为编辑视图添加另一个 if 条件,以返回 if request.method == "DELETE",看看这是否会阻止它发生,但这没有任何作用。

我怀疑这个问题可能与我设置网址模式的方式有关。我为编辑视图创建了单独的模式,因为常规模式不起作用。

这里是用于从添加新空缺视图创建项目的 url 模式(按预期工作)

path("addduty/<int:id>",views.addduty,name="addduty"),
path("removeduty/<int:id>",views.removeduty,name="removeduty"),
path("addoffer/<int:id>",views.addoffer,name="addoffer"),
path("removeoffer/<int:id>",views.removeoffer,name="removeoffer"),
path("addadvantage/<int:id>",views.addadvantage,name="addadvantage"),
path("removeadvantage/<int:id>",views.removeadvantage,name="removeadvantage"),

这是否会导致某种冲突,从而触发 GET 请求并导致刷新?

python django ajax django-views django-templates
2个回答
0
投票

我通过添加“javascript:void(0);”解决了该问题在删除按钮的 href 标签中而不是“#”或将其留空。

<a href="javascript:void(0);" class="trash-icon w-inline-block" onclick ="removeduty({{duty.id}})">

0
投票

与将

duty.id
作为参数直接提供给内联函数相比,使用外部注册的事件处理程序会更干净,该事件处理程序检查(单击)
event
来识别元素,并从中推断出分配的
duty.id
到 event.target 或合适的父级。

如果您要将所有 SVG 图像的所有路径存储在其他地方(见下文),则内联 SVG 图像可以替换为

use
元素 - 这将使 HTML 更小,因为完整路径仅写入一次而不是几十次次。

事件处理程序正在侦听 SVG 元素上的点击,因此超链接现在除了提供在事件处理程序中使用的

data-dutyid
值之外实际上不执行任何操作。在代码片段中,
duty.id
值仅作为“示例”被硬编码数值替换 - 这些在实际代码中将是
{{duty.id}}

const getCookie=(name)=>`Some code to find a cookie named:"${name}"`;
const getresponse=(r)=>r.json();
const callback=(r)=>console.log(r.message);
const errorhandler=(e)=>console.warn('Error deleting duty: %o',e);


document.addEventListener('click',e=>{
  if( e.target instanceof SVGUseElement || e.target instanceof SVGSVGElement ){
    
    e.preventDefault();
    
    let dutyid=e.target.closest('a').dataset.dutyid;
    let config={ 
      method:'delete',
      headers:{ 'X-CSRFToken':getCookie('csrftoken') }
    };
    
    e.target.closest('div.cms-added-item').remove();
    
    fetch( `removeduty/${dutyid}`, config )
      .then( getresponse )
      .then( callback )
      .catch( errorhandler )
  }
});
<div id="dutysection" class="dutyitems">
  <!-- example hardcoded items - loop removed -->
  <div class="cms-added-item">
    <p class=" cms-added-list-item">BANANA</p>
    <div class="action-wrap-app">
      <a href="#" class="trash-icon w-inline-block" data-dutyid="303">
        <div class="delete w-embed">
          <svg viewBox="0 0 36 39"  height="32" fill="none" preserveAspectRatio="xMinYMin">
            <use href="#trashcan" />            
          </svg>
        </div>
      </a>
    </div>
  </div>

  <div class="cms-added-item">
    <p class=" cms-added-list-item">WOMBLE</p>
    <div class="action-wrap-app">
      <a href="#" class="trash-icon w-inline-block" data-dutyid="304">
        <div class="delete w-embed">
          <svg viewBox="0 0 36 39"  height="32" fill="none" preserveAspectRatio="xMinYMin">
            <use href="#trashcan" />            
          </svg>
        </div>
      </a>
    </div>
  </div>
  
  <div class="cms-added-item">
    <p class=" cms-added-list-item">{{duty.text}}</p>
    <div class="action-wrap-app">
      <a href="#" class="trash-icon w-inline-block" data-dutyid="{{duty.id}}">
        <div class="delete w-embed">
          <svg viewBox="0 0 36 39"  height="32" fill="none" preserveAspectRatio="xMinYMin">
            <use href="#trashcan" />            
          </svg>
        </div>
      </a>
    </div>
  </div>
  
</div>














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