使用JavaScript獲取Django模板指定鍵值數據

更新時間：2020年05月27日 10:36:51 作者：破竹

這篇文章主要介紹了使用JavaScript獲取Django模板指定鍵值數據,文中通過示例代碼介紹的非常詳細，對大家的學習或者工作具有一定的參考學習價值,需要的朋友可以參考下

Django中利用js來操作數據的常規(guī)操作一般為點(.)操作符來獲取字典或列表的數據，一般如{{data.0}}，{{data.arg}}

但有時如果數據是嵌套類型的數據時，直接獲取某個值就變得困難了，比如下面的格式要獲取

correct中qxl的值

startArgsSet={"correct":{"qxl":0,"kkx":0},"reliable":{"qxl":0,"kkx":0},"security":{"qxl":0,"kkx":0},"understand":{"qxl":0,"kkx":0},"entropy":{"qxl":0,"kkx":0},
"mature":{"qxl":0,"kkx":0},"active":{"qxl":0,"kkx":0},"service":{"qxl":0,"kkx":0},"file":{"qxl":0,"kkx":0},
"tech":{"qxl":0,"kkx":0},"property":{"qxl":0,"kkx":0},"organize":{"qxl":0,"kkx":0},"develop":{"qxl":0,"kkx":0},
"source":{"qxl":0,"kkx":0},"update":{"qxl":0,"kkx":0},"fix":{"qxl":0,"kkx":0},
"quality":{"qxl":0,"kkx":0},"meanNum":{"qxl":0,"kkx":0},"variance":{"qxl":0,"kkx":0}
}

這時候如果改變數據格式為列表中的無嵌套字典格式比較麻煩，可以自定義過濾器來獲取數據，

from django.template.defaulttags import register

@register.filter
def getArgQxlValue(dictionary,arg):
  return dictionary[arg]['qxl']
  
@register.filter
def getArgKkxValue(dictionary,arg):
  return dictionary[arg]['kkx']
  
@register.filter
def getArgName(dictionary,arg):
  return dictionary[arg]['name']

在模板中就可以以這樣寫

<!-- the second important page of the project-->
{% load staticfiles %}

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>超標信息</title>

   <script src="{% static 'js/a-mynewjs.js' %}"></script>

</head>

<body>

 {{ guestSetArgs|safe }}<br><br><br>
 
 {{ warningdata|safe }}<br><br>
 
 <script>
 {% for i in guestSetArgs %}
  {% for j in warningdata %} 
    if("{{i}}"=="{{j}}")
    {
      if(Number({{warningdata|getArgQxlValue:j}})>Number({{guestSetArgs|getArgQxlValue:i}}))
      var setArgStr="{{warningdata|getArgName:i}} 超出閥值  閥值：{{guestSetArgs|getArgQxlValue:j}}  檢測值：{{warningdata|getArgQxlValue:j}}<br>"
      document.write(setArgStr);
    }
    
  {% endfor %} 
 {% endfor %} 
 
  </script>
</body>
</html>

形如{{warningdata|getArgQxlValue:j}}，就可以獲取到里面的值了