How to get query parameters from URL in Angular 5

Question

I m using angular 5 0 3  I would like to start my application with a bunch of query parameters like  app param1 hallo amp param2 123  Every tip given in How to get query params from url in Angular 2  does not work for me   Any ideas how to get query parameters work   private getQueryParameter key  string   string     const parameters   new URLSearchParams window location search     return parameters get key       This private function helps me to get my parameters  but I don t think it is the right way in new Angular environment    update   My main app looks like   Component        export class AppComponent implements OnInit      constructor private route  ActivatedRoute        ngOnInit    void          would like to get query parameters here           this route

User · Answer

When you have an empty route object  it s mainly due to the fact that you are not using a router-outlet in your app component html   Without this  you won t be able to get a meaningful route object with non empty subObjects  particularly params  amp  queryParams   Try to add  lt router-outlet gt  lt router-outlet gt just before calling your  lt app-main-component gt  lt  app-main-component gt   Before that  make sure you have your query param ready in app-routing   which export the class Route used by App component     param    param  dynamicParam   path  MyMainComponent   Last thing of course  to get your param  I personnaly use this route snapshot params dynamicParam where dynamicParam is the name used in your app-routing component

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Just stumbled upon the same problem and most answers here seem to only solve it for Angular internal routing  and then some of them for route parameters which is not the same as request parameters    I am guessing that I have a similar use case to the original question by Lars   For me the use case is e g  referral tracking   Angular running on mycoolpage com  with hash routing  so mycoolpage com redirects to mycoolpage com     For referral  however  a link such as mycoolpage com referrer foo should also be usable  Unfortunately  Angular immediately strips the request parameters  going directly to mycoolpage com       Any kind of  trick  with using an empty component   AuthGuard and getting queryParams or queryParamMap did  unfortunately  not work for me  They were always empty   My hacky solution ended up being to handle this in a small script in index html which gets the full URL  with request parameters  I then get the request param value via string manipulation and set it on window object  A separate service then handles getting the id from the window object   index html script  const paramIndex   window location href indexOf  referrer     if   window myRef  amp  amp  paramIndex  gt  0      let param   window location href substring paramIndex     param   param split   amp    0     param   param substr param indexOf      1     window myRef   param      Service  declare var window  any    Injectable   export class ReferrerService      getReferrerId         if  window myRef          return window myRef            return null

User · Answer

If you re not using Angular router try  querystring  Install it  npm install --save querystring   to your project  In your component do something like this  import   as qs from  querystring       ngOnInit        const params   qs parse window location search substring 1               The substring 1  is necessary because if you have something like this   mypage foo bar  then the key name for will be  foo

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Found in  Parent components gets empty Params from ActivatedRoute  Worked for me   import  Component  OnDestroy  OnInit  from   angular core   import   Router  ActivatedRoute  Params  RoutesRecognized   from   angular router     Component     selector   app-navigation-bar     templateUrl     navigation-bar component html     styleUrls      navigation-bar component scss      export class NavigationBarComponent implements OnInit  OnDestroy     private sub  any    constructor private route  ActivatedRoute  private router  Router        ngOnInit         this sub   this router events subscribe val   gt          if  val instanceof RoutesRecognized            console log val state root firstChild params                          ngOnDestroy         this sub unsubscribe

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Unfortunately  the cleanest solution is not the most extensible solution  In recent versions of Angular  it is suggested in the other answers that you can easily get the query params using the ActivatedRoute Injectible and specifically utilizing either the snapshot property   this route snapshot queryParamMap get  param     or the subscribe property  used in cases where the query string will update  e g  navigating through user ids    this route queryParamMap subscribe params   gt  console log params      I am here to tell you that these solutions have a gaping flaw that has not been resolved for some time  https   github com angular angular issues 12157  All in all  the only bullet proof solution is to use good old vanilla javascript  In this case  I created a service for URL manipulation   import   Injectable   from   angular core   import   IUrl   from    iurl     Injectable   export class UrlService       static parseQuery url  string   IUrl           const query   url slice url indexOf      1  split   amp    reduce   acc query    gt                const parts   query split                   acc parts 0     parts 1               return acc                           return               a  query  a                b  query  b                c  query  c                d  query  d                e  query  e

User · Answer

This is the cleanest solution for me  import   Component  OnInit   from   angular core   import   ActivatedRoute   from   angular router    export class MyComponent     constructor      private route  ActivatedRoute           ngOnInit         const firstParam  string   this route snapshot queryParamMap get  firstParamKey        const secondParam  string   this route snapshot queryParamMap get  secondParamKey

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import   ParamMap  Router  ActivatedRoute   from   angular router    constructor private route  ActivatedRoute      ngOnInit         console log this route snapshot queryParamMap       UPDATE  import   Router  RouterStateSnapshot   from   angular router    export class LoginComponent       constructor private router  Router            const snapshot  RouterStateSnapshot   router routerState snapshot          console log snapshot        lt -- hope it helps

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Simple Solution       in routing file                      path   checkout  cartId  addressId               loadChildren       gt  import    pages checkout checkout module   then m   gt  m CheckoutPageModule                       in Component file              import   Router  ActivatedRoute   from   angular router                     constructor                        private  Router  ActivatedRoute                                            ngOnInit                         this cartId   this  Router snapshot params cartId                      this addressId   this  Router snapshot params addressId                      console log this addressId   addressId                       console log this cartId   cartId

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At  i think Angular 8   ActivatedRoute params has been replaced by ActivatedRoute paramMap ActivatedRoute queryParams has been replaced by  ActivatedRoute queryParamMap

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its work for me   constructor private route  ActivatedRoute      ngOnInit         this route queryParams subscribe map   gt  map       this route snapshot queryParams       look more options How get query params from url in angular2

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Example below url with two param  type and name   URL   http   localhost 4200 updatePolicy type Medicare 20Insurance amp name FutrueInsurance       constructor private route  ActivatedRoute          Read url query parameter  enter code here    this route queryParams subscribe params   gt        this name  params  type        this type  params  name        alert this type       alert this name

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Angular Router provides method parseUrl url  string  that parses url into UrlTree  One of the properties of UrlTree are queryParams  So you can do sth like   this router parseUrl this router url  queryParams key

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In Angular 5  the query params are accessed by subscribing to this route queryParams  note that later Angular versions recommend queryParamMap  see also other answers   Example   app param1 hallo amp param2 123 param1  string  param2  string  constructor private route  ActivatedRoute        console log  Called Constructor        this route queryParams subscribe params   gt            this param1   params  param1            this param2   params  param2               whereas  the path variables are accessed by this route snapshot params Example   param1  param1 param2  param2 param1  string  param2  string  constructor private route  ActivatedRoute        this param1   this route snapshot params param1      this param2   this route snapshot params param2

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I know that OP asked for Angular 5 solution  but yet for all of you who stumbles upon this question for newer  6   Angular versions  Citing the Docs  regarding ActivatedRoute queryParams  which most of other answers are based on        Two older properties are still available  They are less capable than   their replacements  discouraged  and may be deprecated in a future   Angular version       params     An Observable that contains the required and optional   parameters specific to the route  Use paramMap instead       queryParams     An Observable that contains the query parameters available   to all routes  Use queryParamMap instead    According to the Docs  the simple way to get the query params would look like this   constructor private route  ActivatedRoute       ngOnInit         this param1   this route snapshot paramMap get  param1        this param2   this route snapshot paramMap get  param2        For more advanced ways  e g  advanced component re-usage  see this Docs chapter   EDIT   As it correctly stated in comments below  this answer is wrong - at least for the case specified by OP    OP asks to get global query parameters   app param1 hallo amp param2 123   in this case you should use queryParamMap  just like in  dapperdan1985 answer      paramMap  on the other hand  is used on parameters specific to the route  e g   app  param1  param2  resulting in  app hallo 123    Thanks to  JasonRoyle and  daka for pointing it out

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Be careful with your routes  A  redirectTo  will remove drop any query parameter   const appRoutes  Routes     path   one   component  PageOneComponent     path   two   component  PageTwoComponent     path      redirectTo    one   pathMatch  full     path        redirectTo    two       I called my main component with query parameters like   main param1 a amp param2 b and assume that my query parameters arrive in the  ngOnInit    method in the main component before the redirect forwarding takes effect   But this is wrong  The redirect will came before  drop the query parameters away and call the ngOnInit   method in the main component without query parameters   I changed the third line of my routes to   path      component  PageOneComponent     and now my query parameters are accessible in the main components ngOnInit and also in the PageOneComponent

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You can also Use HttpParams  such as      getParamValueQueryString  paramName         const url   window location href      let paramValue      if  url includes               const httpParams   new HttpParams   fromString  url split      1            paramValue   httpParams get paramName             return paramValue

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Stumbled across this question when I was looking for a similar solution but I didn t need anything like full application level routing or more imported modules    The following code works great for my use and requires no additional modules or imports      GetParam name       const results   new RegExp       amp      name         amp        exec window location href       if  results         return 0            return results 1     0         PrintParams         console log  param1       this GetParam  param1         console log  param2       this GetParam  param2           http   localhost 4200  param1 hello amp param2 123 outputs   param1   hello param2   123

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Query and Path Params  Angular 8   For url like https   myapp com user 666 read age 23 use  import   combineLatest   from  rxjs           combineLatest   this route paramMap  this route queryParamMap       subscribe    pathParams  queryParams     gt        let userId   pathParams get  userId           666     let age      queryParams get  age             23                   UPDATE  In case when you use this router navigate  someUrl    and your query parameters are embedded in someUrl string then angular encodes a URL and you get something like this https   myapp com user 666 read 3Fage 323 - and above solution will give wrong result  queryParams will be empty  and path params can be glued to last path param if it is on the path end   In this case change the way of navigation to this  this router navigateByUrl someUrl

[angular] How to get query parameters from URL in Angular 5?

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