rasp.py返回的值是：第一个是连接到raspberry的传感器数据，第二个是当前时间。这些值必须从我的Django应用程序视图发送到我的html文件才能显示曲线，但结果是一个空白页面。
rasp.py
#!/usr/bin/env python
from datetime import datetime, timedelta
futuredate = datetime.now() + timedelta(days=10)
def foo ( ) :
i = 0
for i in range(0,19):
i += 1
tfile = open("/sys/bus/w1/devices/28-000007101990/w1_slave")
text = tfile.read()
tfile.close()
secondline = text.split("\n")[1]
temp = secondline.split(" ")[9]
temperature = float(temp[2:])
temperature = temperature/1000
mystr = str(temperature)
y = mystr.replace(",",".")
x = datetime.now() + timedelta(days=10)
return x,y
views.py
from django.shortcuts import render
from rasp import foo
import json
def index(request):
return render(request, 'index.html', {'t' : foo()})
index.html脚本位于html
的头部
{% load staticfiles %}
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Temperature sensor graph</title>
<!-- Core CSS - Include with every page -->
<link href="{% static 'css/bootstrap.min.css' %}" rel="stylesheet">
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
<style type="text/css">
${demo.css}
</style>
<script type="text/javascript">
$(function () {
$(document).ready(function () {
Highcharts.setOptions({
global: {
useUTC: false
}
});
$('#container').highcharts({
chart: {
type: 'spline',
animation: Highcharts.svg, // don't animate in old IE
marginRight: 10,
events: {
load: function () {
// set up the updating of the chart each second
var series = this.series[0];
setInterval(function () {
series.addPoint([{{ t }}], true, true);
}, 3000);
}
}
},
title: {
text: 'Live temperature sensor values'
},
xAxis: {
type: 'datetime',
tickPixelInterval: 150
},
yAxis: {
title: {
text: 'Value'
},
plotLines: [{
value: 0,
width: 1,
color: '#808080'
}]
},
tooltip: {
formatter: function () {
return '<b>' + this.series.name + '</b><br/>' +
Highcharts.dateFormat('%Y-%m-%d %H:%M:%S', this.x) + '<br/>' +
Highcharts.numberFormat(this.y, 2);
}
},
legend: {
enabled: false
},
exporting: {
enabled: false
},
series: [{
name: 'Sensor data',
data: (function () {
// generate an array of sensor data
var data = [],
time = (new Date()).getTime(),
i;
data.push({ {{ t }} }
return data;
}())
}]
});
});
});
</script>
</head>
<body>
<nav class="navbar navbar-default">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
{% if user.is_authenticated %}
<a class="navbar-brand" href="/accueil">Accueil </a>
<a class="navbar-brand" href="/aps">Graphe </a>
</div>
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav navbar-right">
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">Account
<span class="caret"></span>
</a>
<ul class="dropdown-menu" role="menu">
<li>
<a href="/mail">changer mail</a>
</li>
<li>
<a href="#">changer temps</a>
</li>
<li class="divider"></li>
<li>
<a href="/logout">Logout</a>
</li>
</ul>
</li>
</ul>
</div>
</nav>
{% else %}
<a class="navbar-brand" href="/accueil">Accueil </a>
<a class="navbar-brand" href="/aps">Graphe </a>
<a class="navbar-brand" href="/login">S'authentifier </a>
</div>
</nav>
{% endif %}
<!-- Core Scripts - Include with every page -->
<script src = "{% static 'js/jquery.min.js' %}"></script>
<script src = "{% static 'js/bootstrap.min.js' %}"></script>
<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/modules/exporting.js"></script>
<div id="container" style="min-width: 310px; height: 400px; margin: 0 auto"></div>
</body>
</html>
<script type="text/javascript">
$(function () {
$(document).ready(function () {
Highcharts.setOptions({
global: {
useUTC: false
}
});
$('#container').highcharts({
chart: {
type: 'spline',
animation: Highcharts.svg, // don't animate in old IE
marginRight: 10,
events: {
load: function () {
// set up the updating of the chart each second
var series = this.series[0];
setInterval(function () {
var x = (new Date()).getTime(), // current time
y = {{ t }} ;
series.addPoint([x, y], true, true);
}, 3000);
}
}
},
title: {
text: 'Live temperature sensor values'
},
xAxis: {
type: 'datetime',
tickPixelInterval: 150
},
yAxis: {
title: {
text: 'Value'
},
plotLines: [{
value: 0,
width: 1,
color: '#808080'
}]
},
tooltip: {
formatter: function () {
return '<b>' + this.series.name + '</b><br/>' +
Highcharts.dateFormat('%Y-%m-%d %H:%M:%S', this.x) + '<br/>' +
Highcharts.numberFormat(this.y, 2);
}
},
legend: {
enabled: false
},
exporting: {
enabled: false
},
series: [{
name: 'Sensor data',
data: (function () {
// generate an array of sensor data
var data = [],
time = (new Date()).getTime(),
i;
for (i = -19; i <= 0; i += 1) {
data.push({
x: time + i * 1000,
y: {{ t }}
});
}
return data;
}())
}]
});
});
});
</script>
答案 0 :(得分：1)
首先，您需要独立于视图测试foo()函数。如果你没有使用单元测试，从django shell调用foo（）来确定它是否有效仍然是一件简单的事情。
如果你从命令中调用foo（），你会发现它只返回一个元组。 x和y值。这是你想要的吗？用一个点绘制曲线非常困难。
其次，在你的模板中
series.addPoint([{{ t }}], true, true);
将等同于
series.addPoint([(10.1, 11.11)])
data.push({ {{ t }} }
return data;
括号（未关闭缺失）。您可以使用chrome开发者控制台（Ctrl Shift J）检查javascript错误
请注意，在模板中迭代列表的正确方法是这样的：
{% for item in t %}
{{ item.x }}, {{ item.y }}
{% endfor %}