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I have one C# variable "value" that I want to pass into JavaScript Chartjs data object. It renders the chart but does not include the two @p values. See code source below:
cshtml file:
@{
int p1 = 43;
int p2 = 45;
}
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title></title>
</head>
<body>
<div style="width: 400px;">
<canvas id="lineChart" width="400" height="400"></canvas>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.min.js"></script>
<script src="main.js"></script>
</body>
</html>
javascript file:
var chart = document.getElementById("lineChart");
var data = {
labels: [2012, 2013, 2014, 2015, 2016, 2017],
datasets: [
{
label: "My Chart Label",
fill: false,
lineTension: 0.1,
data: ['(@p1)', '(@p2)', 50, 48, 47, 52]
}
]
};
var lineChart = new Chart(chart,
{
type: 'line',
data: data
}
);
How can I write it so that it works?
275
You can do
<script type="text/javascript">
var p1 = @p1, p2= @p2;
</script>
and use p1, p2.
var data = {
labels: [2012, 2013, 2014, 2015, 2016, 2017],
datasets: [
{
label: "My Chart Label",
fill: false,
lineTension: 0.1,
data: [p1, p2, 50, 48, 47, 52]
}
]
};
In this case you don't have to use hidden html fields and you can expand your code to use more field like
var tempObj ={
tempData: "",
otherData:"",
moreData: ""
}
Something like below
View:
@{
var p1 = 43;
var p2 = 45
}
<input type="hidden" id="PassingToJavaScript1" value=@p1>
<input type="hidden" id="PassingToJavaScript2" value=@p2>
JavaScript:
var p1 = document.getElementById('PassingToJavaScript1').value;
var p2 = document.getElementById('PassingToJavaScript2').value;
Use a hidden field which will hold the value and then read the hidden field's value from JavaScript.
Example:
@{
int p = 43;
}
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title></title>
</head>
<body>
<div style="width: 400px;">
<canvas id="lineChart" width="400" height="400"></canvas>
<input type="hidden" id="someId" value="@p" />
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.min.js"></script>
<script src="main.js"></script>
</body>
</html>
JS
var chart = document.getElementById("lineChart");
var hiddenFieldValue = document.getElementById("someId").value;
var data = {
labels: [2012, 2013, 2014, 2015, 2016, 2017],
datasets: [
{
label: "My Chart Label",
fill: false,
lineTension: 0.1,
data: ['(hiddenFieldValue)', 45, 50, 48, 47, 52] // Not really sure how to format the data but you get main idea...
}
]
};
var lineChart = new Chart(chart,
{
type: 'line',
data: data
}
);
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