我有以下JSON对象:http : //pastebin.com/1TguvZXc
我尝试为每个模型,年份和样式访问以下属性:Model.Model []。Years []。Styles []。submodel.modelName
我的尝试:
<div *ngFor="let model of models?.models">
<div *ngFor="let submodel of model['years']['styles']">
Test: {{ submodel.modelName}}
</div>
</div>
这不会返回任何错误,但是不会显示我的数据。
另外,我想使用unique
from管道ngx-pipes
过滤掉重复项modelName
。
如何显示submodel.modelName的唯一值?
以下代码:
<div *ngFor="let model of models?.models | unique">
<div *ngFor="let year of model['years']">
<div *ngFor="let style of year['styles']">
{{model.name}}, {{ style.submodel.body }}
</div>
</div>
</div>
产生以下输出:
2 Series, Coupe 2 Series, Coupe 2 Series, Convertible 2 Series, Convertible 2 Series, Convertible 2 Series, Coupe 2 Series, Convertible 2 Series, Coupe 3 Series, Sedan 3 Series, Sedan 3 Series, Sedan 3 Series, Sedan 3 Series, Wagon 3 Series, Sedan 3 Series, Sedan 3 Series, Wagon 3 Series, Sedan 3 Series, Sedan 3 Series, Sedan 3 Series Gran Turismo, Hatchback 3 Series Gran Turismo, Hatchback 4 Series, Convertible 4 Series, Convertible 4 Series, Convertible 4 Series, Convertible 4 Series, Coupe 4 Series, Coupe 4 Series, Coupe 4 Series, Coupe 4 Series Gran Coupe, Sedan 4 Series Gran Coupe, Sedan 4 Series Gran Coupe, Sedan 4 Series Gran Coupe, Sedan 5 Series, Sedan 5 Series Gran Turismo, Hatchback 5 Series Gran Turismo, Hatchback 5 Series Gran Turismo, Hatchback 6 Series, Convertible 6 Series, Coupe 6 Series, Convertible 6 Series, Convertible 6 Series, Coupe 6 Series, Convertible 6 Series, Coupe 6 Series, Coupe 6 Series Gran Coupe, Sedan 6 Series Gran Coupe, Sedan 6 Series Gran Coupe, Sedan 6 Series Gran Coupe, Sedan 7 Series, Sedan 7 Series, Sedan 7 Series, Sedan 7 Series, Sedan 7 Series, Sedan 7 Series, Sedan ALPINA B6 Gran Coupe, Sedan ALPINA B7, Sedan M2, Coupe M3, Sedan M4, Convertible M4, Coupe M6, Convertible M6, Coupe M6 Gran Coupe, Sedan X1, SUV X1, SUV X3, SUV X3, SUV X3, SUV X3, SUV X4, SUV X4, SUV X5, SUV X5, SUV X5, SUV X5, SUV X5, SUV X5 M, SUV X6, SUV X6, SUV X6, SUV X6 M, SUV i3, Hatchback i3, Hatchback i3, Hatchback i8, Coupe
这远非理想。我想过滤数据,使其具有唯一性,如下所示:
2 Series, Coupe 2 Series, Convertible 3 Series, Sedan 3 Series, Wagon 3 Series Gran Turismo, Hatchback 4 Series, Convertible 4 Series, Coupe 4 Series Gran Coupe, Sedan 5 Series, Sedan 5 Series Gran Turismo, Hatchback 6 Series, Convertible 6 Series, Coupe 6 Series Gran Coupe, Sedan 7 Series, Sedan ALPINA B6 Gran Coupe, Sedan ALPINA B7, Sedan M2, Coupe M3, Sedan M4, Convertible M4, Coupe M6, Convertible M6, Coupe M6 Gran Coupe, Sedan X1, SUV X3, SUV X4, SUV X5, SUV X5 M, SUV X6, SUV X6 M, SUV i3, Hatchback i8, Coupe
您的心理模型看起来正确(第二行),但您ngFor
的模型却不正确。这是给定JSON形状的预期伪代码:
// div ngFor="let model of models?.models"
// div ngFor="let year of model.years"
// div ngFor="let style of year.styles"
// Test: {{ style.submodel | json }}
使用JSON格式化程序查看数据的形状可能会有所帮助(例如:http : //jsonformatter.org/)。
编辑:如果您需要过滤数组,一种解决方案是自定义管道。我更新了plnkr以包含示例。我将ngFor
指令内部的数组通过管道传递给管道,并使用哈希映射来过滤结果。在生产代码中,我希望您createHashKey()
可以用更好的实现来替换函数的内部,以对独特的示例进行分类。
模板摘录:
<div *ngFor="let model of models?.models">
<div *ngFor="let year of model.years">
<div *ngFor="let style of (year.styles | myCustomPipe:'submodel')">
Test: {{ style.submodel | json }}
</div>
</div>
</div>
自定义管道:
@Pipe({
name: 'myCustomPipe'
})
export class MyCustomPipe implements PipeTransform {
transform(value: any[], ...args: string[]): any[] {
let hashMap = {};
let filterKey = args[0];
for (let v of value) {
const hashKey = createHashKey(v, filterKey);
hashMap[hashKey] = v;
}
return Object.values(hashMap);
}
}
function createHashKey(obj: any, filterKey: string): string {
// For demonstration purposes only:
return JSON.stringify(obj.filterKey);
}
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