[英]How to update matrix parameters in Angular2
In Angular2, is there a way to update a matrix parameter, but navigate to the same component?在 Angular2 中,有没有办法更新矩阵参数,但导航到同一个组件? Basically would like to transition easily from a url that looks like:
基本上想从如下所示的 url 轻松转换:
/search;term=paris;pageSize=24;currentPage=1;someFilter=value;
to the same thing, but with currentPage updated upon pagination:同样的事情,但在分页时更新 currentPage :
/search;term=paris;pageSize=24;currentPage=2;someFilter=value;
using router.navigate
hasn't appeared to be the best option, since I'd have to write plenty of my own logic to re-construct the url for navigate
's use (re-constructing something that already exists).使用
router.navigate
似乎不是最好的选择,因为我必须编写大量自己的逻辑来重新构建 url 以供navigate
使用(重新构建已经存在的东西)。
For kicks and giggles, I did try对于踢腿和傻笑,我确实尝试过
this._router.navigate([this._router.url, {currentPage: this.pagination.currentPage}]);
but (as you might expect), the router is dumb to the fact that there are matrix parameters on the current url, so the result is not pretty.但是(如您所料),路由器对当前 url 上有矩阵参数这一事实很愚蠢,因此结果并不漂亮。
EDIT: Should also mention that there may be any number of additional key/value pairs of matrix parameters, so hard-coding any route is out of the question编辑:还应该提到可能有任意数量的矩阵参数的附加键/值对,因此对任何路由进行硬编码都是不可能的
EDIT: I've since tried to use preserveQueryParams: true
like:编辑:我从那以后尝试使用
preserveQueryParams: true
像:
this._router.navigate(["..", {currentPage: this.pagination.currentPage}], {preserveQueryParams: true});
in order to get to an easily usable/transferable solution, but that did not keep the matrix params on the route.为了获得易于使用/可转移的解决方案,但这并没有将矩阵参数保留在路线上。
UPDATE: I've since implemented my own logic to get the required behavior, so here's a code snippet for the solution:更新:我已经实现了我自己的逻辑来获得所需的行为,所以这里是解决方案的代码片段:
let currentParamsArr: Params = this.route.snapshot.params;
let currentParamsObj: any = { };
for (let param in currentParamsArr) {
currentParamsObj[param] = currentParamsArr[param];
}
currentParamsObj.currentPage = +pageNum; //typecasting shortcut
this._router.navigate([currentParamsObj], { relativeTo: this.route });
This code loops through the parameters (as they stand in the snapshot), and creates an object out of them, then adds/edits the parameter that I desire to update, then navigates to the "new" route这段代码循环遍历参数(就像它们在快照中一样),并从中创建一个对象,然后添加/编辑我想要更新的参数,然后导航到“新”路由
But, this is not pretty, as I'll essentially have this same logic in many places of the program or have to make a modification to Router or provide some other generic method.但是,这并不漂亮,因为我将在程序的许多地方基本上具有相同的逻辑,或者必须对 Router 进行修改或提供一些其他通用方法。
The approach that ended up working well for me is this:最终对我来说效果很好的方法是这样的:
let route: ActivatedRoute;
const newUrl = router.createUrlTree([
merge({'a': 123}, route.snapshot.params)
], {relativeTo: route});
By using merge, you can add, update and subtract url parameters and then use router.navigateByUrl(newUrl)
in order to execute.通过使用merge,你可以添加、更新和减去url参数,然后使用
router.navigateByUrl(newUrl)
来执行。
add: merge({newParam: 111}, route.snapshot.params)
update: merge({param: 111}, route.snapshot.params)
subtract: merge({param: null}, route.snapshot.params)
Hope others find this as useful as I have.希望其他人觉得这和我一样有用。
Another example using Object.assign instead of merge:另一个使用 Object.assign 而不是 merge 的例子:
let route = this.route; // The imported ActivatedRoute
let currentParamsObj: Params = Object.assign({}, route.params);
let newParam = {};
newParam[key] = value;
let newUrl = this._router.createUrlTree([
Object.assign(currentParamsObj, newParam)
], {relativeTo: this.route });
this._router.navigateByUrl(newUrl);
你有没有试过使用类似的东西
this._router.navigateByUrl('/search;term='+this.term+';pageSize='+this.pageSize+';currentPage='+this.currentPage+';someFilter='+this.someFilter;
In my case, I had a parent and child router, with params on the parent I needed to modify: /my-parent;x=1;y=2/my-child
就我而言,我有一个父子路由器,我需要修改父级上的参数:
/my-parent;x=1;y=2/my-child
Working off of @Corbfon's solution, I was able to modify the parent route like this:使用@Corbfon 的解决方案,我能够像这样修改父路由:
// modify the context params in the PARENT route
const newParam = {'z': '3'};
const parentParams: Params = Object.assign({ ...this.activatedRoute.parent.snapshot.params }, newParam);
// note: this approach doesn't preserve params on the child route (but there aren't any in my case)
const currentChildPath = this.activatedRoute.routeConfig.path;
// notice it's relativeTo the parent route
const newUrl = this.router.createUrlTree([parentParams, currentChildPath],
{relativeTo: this.activatedRoute.parent});
this.router.navigateByUrl(newUrl);
Hope this helps someone else.希望这对其他人有帮助。
PS Don't forget to use .snapshot.params
instead of .params
on the ActivatedRoute
. PS 不要忘记在
ActivatedRoute
上使用.snapshot.params
而不是.params
。
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