使用JavaScript获取Django模板指定键值数据

Django中利用js来操作数据的常规操作一般为点(.)操作符来获取字典或列表的数据，一般如{{data.0}}，{{data.arg}}

但有时如果数据是嵌套类型的数据时，直接获取某个值就变得困难了，比如下面的格式要获取

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}
}

这时候如果改变数据格式为列表中的无嵌套字典格式比较麻烦，可以自定义过滤器来获取数据，

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']

在模板中就可以以这样写

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

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>超标信息</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}} 超出阀值  阀值：{{guestSetArgs|getArgQxlValue:j}}  检测值：{{warningdata|getArgQxlValue:j}}<br>"
      document.write(setArgStr);
    }
    
  {% endfor %} 
 {% endfor %} 
 
  </script>
</body>
</html>

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

稍做美化

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