我将Flask框架与render_template一起使用。 Flask返回列表到if.html文件。我在if.html文件中使用Chart.js从烧瓶返回的列表中创建图形。当我在HTML文件中使用 Chart.js 代码时，它可以正常工作，但是当我要将相同的javascript代码复制到外部 line.js 文件并将其链接回去时到我的 whether.html ，然后我看到 SyntaxError：预期的属性名称，在控制台中出现'％' javascript错误。
对于这个问题，我将不胜感激。
是否包含JavaScript。html
{% extends "index.html" %}
{% block content %}
<!-- bar chart canvas element -->
<canvas id="myChart" width="600" height="400"></canvas>
<p id="pointSelected">Point selected:</p>
<script>
// Global parameters:
// do not resize the chart canvas when its container does (keep at 600x400px)
Chart.defaults.global.responsive = false;
// define the chart data
var chartData = {
labels : [{% for item in labels %}
"{{item}}",
{% endfor %}],
datasets : [{
label: '{{ legend }}',
fill: false,
lineTension: 0.1,
backgroundColor: "rgba(75,192,192,0.4)",
borderColor: "rgba(75,192,192,1)",
borderCapStyle: 'butt',
borderDash: [],
borderDashOffset: 0.0,
borderJoinStyle: 'miter',
pointBorderColor: "rgba(75,192,192,1)",
pointBackgroundColor: "#fff",
pointBorderWidth: 1,
pointHoverRadius: 5,
pointHoverBackgroundColor: "rgba(75,192,192,1)",
pointHoverBorderColor: "rgba(220,220,220,1)",
pointHoverBorderWidth: 2,
pointRadius: 1,
pointHitRadius: 10,
data : [{% for item in values %}
{{item}},
{% endfor %}],
spanGaps: false
},
{
label: 'Sensor 2',
fill: false,
lineTension: 0.1,
borderColor: "#3e95cd",
data : [{% for item in values %}
{{item + 3}},
{% endfor %}],
}
]
}
// get chart canvas
var holder = document.getElementById("myChart");
var ctx = document.getElementById("myChart").getContext("2d");
// create the chart using the chart canvas
var myChart = new Chart(ctx, {
type: 'line',
data: chartData,
options: {
tooltips: {
enabled: true,
mode: 'single',
callbacks: {
label: function(tooltipItems, data) {
return tooltipItems.yLabel + ' degrees';
}
}
},
}
});
// get the text element below the chart
var pointSelected = document.getElementById("pointSelected");
// create a callback function for updating the selected index on the chart
holder.onclick = function(evt){
var activePoint = myChart.getElementAtEvent(evt);
console.log(activePoint);
console.log('x:' + activePoint[0]._view.x);
console.log('maxWidth: ' + activePoint[0]._xScale.maxWidth);
console.log('y: ' + activePoint[0]._view.y);
console.log('index: ' + activePoint[0]._index);
pointSelected.innerHTML = 'Point selected... index: ' + activePoint[0]._index;
};
</script>
{% endblock %}
line.js文件
// Global parameters:
// do not resize the chart canvas when its container does (keep at 600x400px)
Chart.defaults.global.responsive = false;
// define the chart data
var chartData = {
labels : [{% for item in labels %}
"{{item}}",
{% endfor %}],
datasets : [{
label: '{{ legend }}',
fill: false,
lineTension: 0.1,
backgroundColor: "rgba(75,192,192,0.4)",
borderColor: "rgba(75,192,192,1)",
borderCapStyle: 'butt',
borderDash: [],
borderDashOffset: 0.0,
borderJoinStyle: 'miter',
pointBorderColor: "rgba(75,192,192,1)",
pointBackgroundColor: "#fff",
pointBorderWidth: 1,
pointHoverRadius: 5,
pointHoverBackgroundColor: "rgba(75,192,192,1)",
pointHoverBorderColor: "rgba(220,220,220,1)",
pointHoverBorderWidth: 2,
pointRadius: 1,
pointHitRadius: 10,
data : [{% for item in values %}
{{item}},
{% endfor %}],
spanGaps: false
},
{
label: 'Sensor 2',
fill: false,
lineTension: 0.1,
borderColor: "#3e95cd",
data : [{% for item in values %}
{{item + 3}},
{% endfor %}],
}
]
}
// get chart canvas
var holder = document.getElementById("myChart");
var ctx = document.getElementById("myChart").getContext("2d");
// create the chart using the chart canvas
var myChart = new Chart(ctx, {
type: 'line',
data: chartData,
options: {
tooltips: {
enabled: true,
mode: 'single',
callbacks: {
label: function(tooltipItems, data) {
return tooltipItems.yLabel + ' degrees';
}
}
},
}
});
// get the text element below the chart
var pointSelected = document.getElementById("pointSelected");
// create a callback function for updating the selected index on the chart
holder.onclick = function(evt){
var activePoint = myChart.getElementAtEvent(evt);
console.log(activePoint);
console.log('x:' + activePoint[0]._view.x);
console.log('maxWidth: ' + activePoint[0]._xScale.maxWidth);
console.log('y: ' + activePoint[0]._view.y);
console.log('index: ' + activePoint[0]._index);
pointSelected.innerHTML = 'Point selected... index: ' + activePoint[0]._index;
};
whether.html文件
{% extends "index.html" %}
{% block content %}
<!-- <script src='static/Chart.min.js'></script> -->
<script src='static/js/Chart.js'></script>
<script src='static/js/line.js'></script>
<!-- <canvas id="line-chart" width="300" height="150"></canvas> -->
<h1>Temperature Sensor #1</h1>
<!-- bar chart canvas element -->
<canvas id="myChart" width="600" height="400"></canvas>
<p id="pointSelected">Point selected:</p>
{% endblock %}
答案 0 :(得分：0)
Jinja仅适用于html文件，您不能在其他文件中使用它的标签。但是，您可以简单地用变量来呈现小脚本，该变量在html模板中包含所需的值，而不是在外部脚本中使用它们，例如：
{% extends "index.html" %}
{% block content %}
<!-- bar chart canvas element -->
<canvas id="myChart" width="600" height="400"></canvas>
<p id="pointSelected">Point selected:</p>
<script>
var labels = [{% for item in labels %}
"{{item}}",
{% endfor %}]
var data = [{% for item in values %}
{{item}},
{% endfor %}]
// and so on for each variable
// it's important to import external script
// after variables declaration, not before
</script>
<script src="external-script.js"></script>
{% endblock %}
，然后您可以简单地在外部脚本中使用它们，例如：
var chartData = {
labels : labels,
// and so on
};