我对外部化了解不多。我在Angular中创建一个月选择器。在我的typesccript文件中,我有一个数月的带有硬编码名称的数组:
arr = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
我的上级告诉我将它们外部化在一个单独的json文件中,以便以后可以根据需要轻松地对其进行修改。现在,我将向您展示我的代码。
monthpicker.component.ts
import { Component, OnInit } from '@angular/core';
import { TranslateService } from '@ngx-translate/core';
@Component({
...
})
export class MonthpickerComponent implements OnInit {
constructor(private translate: TranslateService){
}
//arr = ['Jan', 'Feb', ... 'Nov', 'Dec'];
monthArray = []; /* USING A DIFFERENT EMPTY ARRAY INSTEAD*/
translateCard(): void {
this.translate
.get([
'Months.January',
'Months.February',
...
'Months.December'
])
.subscribe(translations => {
this.monthArray.push(translations['Months.January']);
this.monthArray.push(translations['Months.February']);
...
this.monthArray.push(translations['Months.December']);
});
console.log(this.monthArray);
}
ngOnInit(): void {
this.translateCard();
}
/* CODE TO READ MONTH NAMES AND RENDER IN HTML*/
n = 4;
matrix: any = Array.from({ length: Math.ceil(this.monthArray.length / this.n) }, (_, i) => i).map(i =>
this.monthArray.slice(i * this.n, i * this.n + this.n).map(x => ({
monthName: x,
isSelected: false
}))
);
...
}
monthpicker.component.html
<div *ngFor="let row of matrix" class="my-table">
<span *ngFor="let x of row">
<span class="month-name">
{{ x.monthName }}
</span>
</span>
</div>
还有这里en-US.json
{
"Months": {
"January": "Jan",
"February": "Feb",
...
"October": "Oct",
"November": "Nov",
"December": "Dec"
}
}
这是我所有的代码。控制台上甚至没有一个错误或警告。实际上,console.log(this.monthArray[])
也可以正确打印所有月份。但是在前端,我的月选择面板绝对空白。什么都没发生。我认为我的电话在这里是异步的:
ngOnInit(): void {
this.translateCard();
}
我尝试过safely use translate.instant()和许多其他解决方案,但还是空白。请更正我的实现问题。
订阅后,您需要填充matrix
数组,即>
translateCard(): void {
this.translate
.get([
'Months.January',
'Months.February',
...
'Months.December'
])
.subscribe(translations => {
this.monthArray.push(translations['Months.January']);
this.monthArray.push(translations['Months.February']);
...
this.monthArray.push(translations['Months.December']);
// populate matrix
this.matrix = Array.from({ length: Math.ceil(this.monthArray.length /
this.n) }, (_, i) => i).map(i =>
this.monthArray.slice(i * this.n, i * this.n + this.n).map(x => ({
monthName: x,
isSelected: false
}))
);
});
}