角度是否可以检测查询参数是否已更改? [英] Angular is it possible to detect if query Paramter has changed?

问题描述

角度是否可以检测查询参数是否已更改? 我有一个处理2个查询参数的组件，根据您所附带的参数，它设置了一些变量true或false.问题是，如果im在我的带有queryparameter 1的组件上，则qp可以更改为第二个参数而不会离开该组件，在这种情况下，我需要不同地设置变量.那么我该如何检测呢?那有可能吗?

解决方案

您可以订阅根组件中的参数

 constructor(route:ActivatedRoute) {
    route.queryParams.subscribe(p => console.log(p.myQueryParam)); // you can also do this in ngOnInit
}
 

另请参见 https://angular.io/api/router/ActivatedRoute

您也可以在其他路由级别上使用查询参数，但随后将它们称为矩阵参数.

另请参阅本节的结尾 https://angular. io/guide/router#route-parameters-required-or-可选

Angular is it possible to detect if query Paramter has changed? I have a Component that handles 2 query paramters and according to what paramter you come with it sets some variables true or false. The Problem is if im on my component with queryparameter 1 the qp can change to the second paramter without leaving the component and in that case i need to set variables diffrently. So how do I detect that? Is that even possible?

解决方案

You can subscribe to the params in the root component

constructor(route:ActivatedRoute) {
    route.queryParams.subscribe(p => console.log(p.myQueryParam)); // you can also do this in ngOnInit
}

See also https://angular.io/api/router/ActivatedRoute

You can have query params on other route levels as well, but then they are called matrix parameters.

See also the end of this section https://angular.io/guide/router#route-parameters-required-or-optional

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