Dynamic queryParams with a routerLink link in Angular

问题

I'm trying to pass a parameter to my routerLink within a loop. Here is what the array of objects looks like:

Here is the loop with the routerLink link:

<li *ngFor="let Achievement of AllAchievements">

    example from multiple sources
    does not work with a variable 'x'. Outputs the letter x
    <a routerLink="page" [queryParams]="{x : 1}">anchor text</a> 

    example from multiple sources
    link is outputted /%5B'page',%20%7BAchievement.type%20:%20'hello'%7D%20%5D'
    <a routerLink="['page', {Achievement.type : 'hello'} ]">anchor text</a>

    outputs long/encoded string as param value 
    <a [routerLink]="['page']" queryParams="{ [Achievement.type] : 'hello' }">anchor text</a>
</li>

Desired output: <a href="page?position=hello"></a>

来源：https://stackoverflow.com/questions/46574652/dynamic-queryparams-with-a-routerlink-link-in-angular