JavaScript获取Django模板中指定键值的数据，使用渲染器
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2022-06-13 19:06:32
Django中利用js来操作数据的常规操作一般为点(.)操作符来获取字典获列表的数据，一般入{{data.0}}，{{data.arg}}等 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 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，可以自定义渲染器来 ......
django中利用js来操作数据的常规操作一般为点(.)操作符来获取字典获列表的数据，一般入{{data.0}}，{{data.arg}}等
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，可以自定义渲染器来获取数据，
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