JavaScript获取Django模板中指定键值的数据，使用过滤器

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}}&nbsp;超出阀值&nbsp;&nbsp;阀值：{{guestSetArgs|getArgQxlValue:j}}&nbsp;&nbsp;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

参考自https://docs.djangoproject.com/en/2.2/howto/custom-template-tags/

巴特西

JavaScript获取Django模板中指定键值的数据，使用过滤器

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