I'm having trouble displaying charts after switching from segments. I currently have 2 segments, index and edit. On the index I successfully display a chart with Chart.js.
从段切换后我无法显示图表。我目前有2个段,索引和编辑。在索引上我成功显示了Chart.js的图表。
Code for the chart:
图表代码:
diagram = function() {
var finished = 0;
var pending = 0;
for (var i = 0; i < this.goal.activities.length; i++) {
var current = this.goal.activities[i];
if (current.completed == true) { finished++ } else { pending++ }
}
this.piChart = new Chart(this.piCanvas.nativeElement, {
type: 'doughnut',
data: {
labels: ["finished activities", "pending activities"],
datasets: [{
label: '# of Votes',
data: [
finished
,
pending
],
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(54, 162, 235, 0.2)'
],
hoverBackgroundColor: [
"#FF6384",
"#36A2EB"
]
}]
}
})
}
And calling the function:
并调用函数:
ionViewDidEnter() {
this.diagram();
}
Now on the page it's initial view the diagram loads successfully and results in a beautiful doughnut. The problem is after I click a segment and then come back to the initial page (with the diagram). Now the chart is gone. I still see it in the HTML but it just does not render in the view.
现在在页面上,它是初始视图,图表加载成功,并产生一个美丽的甜甜圈。问题是在我单击一个段然后返回到初始页面(带有图表)之后。现在图表已经消失了。我仍然在HTML中看到它,但它只是在视图中不呈现。
Code in the view:
视图中的代码:
<ion-header>
<ion-navbar color="primary">
<ion-title>{{ goal.title }}</ion-title>
</ion-navbar>
</ion-header>
<ion-content>
<ion-segment [(ngModel)]="goalTab">
<ion-segment-button value="progress">
Progress
</ion-segment-button>
<ion-segment-button value="activities">
Actitivies
</ion-segment-button>
</ion-segment>
<div [ngSwitch]="goalTab">
<ion-card *ngSwitchCase="'progress'">
<ion-card-header>
Overview of activities for: {{ goal.title }}
</ion-card-header>
<ion-card-content>
<canvas #piCanvas></canvas>
</ion-card-content>
</ion-card>
<ion-list *ngSwitchCase="'activities'">
<ion-item>
<ion-card-header>
Something other segment
</ion-card-header>
</ion-item>
</ion-list>
</div>
</ion-content>
Hopefully someone is able to locate the problem and help me out, thanks!
希望有人能够找到问题并帮助我,谢谢!
UPDATE
UPDATE
The Canvas with it's chart is not in the HTML. On it's initial load I see the following (which is correct):
带有图表的Canvas不在HTML中。在它的初始加载我看到以下(这是正确的):
And after switching to another segment and back to the one which should render the chart (incorrect):
切换到另一个段并返回到应该呈现图表的段(不正确)之后:
So somehow after switching from segments the Chart is not correctly being initialized.
因此,在从段切换后,图表未正确初始化。
1 个解决方案
#1
0
Try this in the chart's ion-card:
在图表的离子卡中试试这个:
<ion-card [style.display]="goalTab == 'progress' ? 'block' : 'none'">
<ion-card-header>
Overview of activities for: {{ goal.title }}
</ion-card-header>
<ion-card-content>
<canvas #piCanvas></canvas>
</ion-card-content>
</ion-card>
#1
0
Try this in the chart's ion-card:
在图表的离子卡中试试这个:
<ion-card [style.display]="goalTab == 'progress' ? 'block' : 'none'">
<ion-card-header>
Overview of activities for: {{ goal.title }}
</ion-card-header>
<ion-card-content>
<canvas #piCanvas></canvas>
</ion-card-content>
</ion-card>