我有一个来自API的动态json,如下所示:
{123: "Mumbai", 456: "Bangalore", 789: "Chennai", 101: "Andhra",...}
我在我的模板中编写了HTML代码,其中我从我的资源文件夹中获取了image-1,image-2徽标
<div class="row">
<div class="col-6" (click)="cityClick('Bangalore')">
<div class="img-1">
// my image-1 logo goes here
</div>
<div class="img-text">
Bangalore
</div>
</div>
<div class="col-6" col-6 (click)="cityClick('Mumbai')">
<div id="image_block" class="img-2">
// my image-2 logo goes here
</div>
<div id="text_block" class="img-text">
Mumbai
</div>
</div>
</div>
如何在我点击图像时获取json的键,并从相应的键值显示图像下方的文本。当我点击我应该能够传递click事件中的键和文本。请帮忙,因为我是Angular的新手!
首先将此JSON转换为JavaScript / TypeScript数组,如下所示:
var json = {123: "Mumbai", 456: "Bangalore", 789: "Chennai", 101: "Andhra" };
var jsonToBeUsed = [];
for (var type in json) {
item = {};
item.key = type;
item.value = json[type];
jsonToBeUsed.push(item);
}
这将产生如下数据:
现在在模板中使用NgFor来绑定数组。 (请参阅this获取NgFor)
<div class="row">
<div *ngFor="let item of array">
<div class="col-6" (click)="cityClick(item)">
<div class="img-1">
// my image-1 logo goes here
</div>
<div class="img-text">
{{item.value}}
</div>
</div>
</div>
</div>
我们已经在click事件中传递了整个对象。您可以在单击事件处理程序中从对象中读取任何所需的属性,您将在组件中编写该属性。
根据您的特殊要求,您可以使用以下标记:
<div class='row' *ngFor='let index of array; let i = index; let even = even'>
<div *ngIf="even" class='col-6' (click)="cityClick(array[i])">
<div class="img-1">
// my image-1 logo goes here
</div>
<div class="img-text">
{{array[i].value}}
</div>
</div>
<div *ngIf="!even" class='col-6' (click)="cityClick(array[i])">
<div class="img-1">
// my image-1 logo goes here
</div>
<div class="img-text">
{{array[i].value}}
</div>
</div>
</div>
在您的代码中使用以下函数:
getKeyByValue(object, value) {
return Object.keys(object).find(key => object[key] === value);
}
并用作
var dynamicJson = {123: "Mumbai", 456: "Bangalore", 789: "Chennai", 101: "Andhra"}
cityClick(value){
var key = this.getKeyByValue(this.dynamicJson, value);
console.log(key);
}
{123: "Mumbai", 456: "Bangalore", 789: "Chennai", 101: "Andhra",...}
你对那个JSON有影响吗?这对我来说非常像一个设计问题。我假设这些数字是id。我相信这样的事情会更好:
[{id: "123", name: "Mumbai"}, {id: "456", name: "Bangalore"}, {id: "789", name: "Chennai"}, {id: "101", name: "Andhra"},...}]
在这种情况下,您会收到一系列城市,这些城市可能是要解析的界面。
export interface City {
id: string;
name: string;
}
您可以使用* ngFor轻松地在html中呈现它
<div *ngFor="let city of cities">
<!--do something with city.id and city.name-->
</div>
<div *ngFor let value of json |keyvalue > </div>