Read class decorator information in typescript











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I have a class decorated with attributes.



I would like to read the attributes in the constructor ( or other method ).



I have tried using Reflect and all possible methods on that class but I only get undefined



The class looks like this



@inject(Element)
@bindable('color')
export class Messagebarhost {

public element: HTMLElement;

constructor(element) {
console.log(Reflect.getMetadata("design:paramtypes", this));
// prints undefined
// somehow I want to read the value 'color'
}
}


If I set a breakpoint in the bundled js file where the decorators are created. Below line will print the correct value if I enter it in the debugger



r.__metadata__.undefined["aurelia:resource"].properties[0]









share|improve this question


























    up vote
    0
    down vote

    favorite












    I have a class decorated with attributes.



    I would like to read the attributes in the constructor ( or other method ).



    I have tried using Reflect and all possible methods on that class but I only get undefined



    The class looks like this



    @inject(Element)
    @bindable('color')
    export class Messagebarhost {

    public element: HTMLElement;

    constructor(element) {
    console.log(Reflect.getMetadata("design:paramtypes", this));
    // prints undefined
    // somehow I want to read the value 'color'
    }
    }


    If I set a breakpoint in the bundled js file where the decorators are created. Below line will print the correct value if I enter it in the debugger



    r.__metadata__.undefined["aurelia:resource"].properties[0]









    share|improve this question
























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I have a class decorated with attributes.



      I would like to read the attributes in the constructor ( or other method ).



      I have tried using Reflect and all possible methods on that class but I only get undefined



      The class looks like this



      @inject(Element)
      @bindable('color')
      export class Messagebarhost {

      public element: HTMLElement;

      constructor(element) {
      console.log(Reflect.getMetadata("design:paramtypes", this));
      // prints undefined
      // somehow I want to read the value 'color'
      }
      }


      If I set a breakpoint in the bundled js file where the decorators are created. Below line will print the correct value if I enter it in the debugger



      r.__metadata__.undefined["aurelia:resource"].properties[0]









      share|improve this question













      I have a class decorated with attributes.



      I would like to read the attributes in the constructor ( or other method ).



      I have tried using Reflect and all possible methods on that class but I only get undefined



      The class looks like this



      @inject(Element)
      @bindable('color')
      export class Messagebarhost {

      public element: HTMLElement;

      constructor(element) {
      console.log(Reflect.getMetadata("design:paramtypes", this));
      // prints undefined
      // somehow I want to read the value 'color'
      }
      }


      If I set a breakpoint in the bundled js file where the decorators are created. Below line will print the correct value if I enter it in the debugger



      r.__metadata__.undefined["aurelia:resource"].properties[0]






      typescript aurelia






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 19 at 0:28









      Magnus Danielson

      11




      11
























          1 Answer
          1






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          up vote
          0
          down vote













          I think you shouldn't put the decorator on the class but rather on a field as shown below:



          @inject(Element)
          export class Messagebarhost {

          public element: HTMLElement;
          @bindable color;


          constructor(element) {
          // this.color is not bound here yet.
          }

          attached () {
          // You need to wait till the attached or the bind function is
          // called to get the correct value in this.color.
          }
          }





          share|improve this answer























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            up vote
            0
            down vote













            I think you shouldn't put the decorator on the class but rather on a field as shown below:



            @inject(Element)
            export class Messagebarhost {

            public element: HTMLElement;
            @bindable color;


            constructor(element) {
            // this.color is not bound here yet.
            }

            attached () {
            // You need to wait till the attached or the bind function is
            // called to get the correct value in this.color.
            }
            }





            share|improve this answer



























              up vote
              0
              down vote













              I think you shouldn't put the decorator on the class but rather on a field as shown below:



              @inject(Element)
              export class Messagebarhost {

              public element: HTMLElement;
              @bindable color;


              constructor(element) {
              // this.color is not bound here yet.
              }

              attached () {
              // You need to wait till the attached or the bind function is
              // called to get the correct value in this.color.
              }
              }





              share|improve this answer

























                up vote
                0
                down vote










                up vote
                0
                down vote









                I think you shouldn't put the decorator on the class but rather on a field as shown below:



                @inject(Element)
                export class Messagebarhost {

                public element: HTMLElement;
                @bindable color;


                constructor(element) {
                // this.color is not bound here yet.
                }

                attached () {
                // You need to wait till the attached or the bind function is
                // called to get the correct value in this.color.
                }
                }





                share|improve this answer














                I think you shouldn't put the decorator on the class but rather on a field as shown below:



                @inject(Element)
                export class Messagebarhost {

                public element: HTMLElement;
                @bindable color;


                constructor(element) {
                // this.color is not bound here yet.
                }

                attached () {
                // You need to wait till the attached or the bind function is
                // called to get the correct value in this.color.
                }
                }






                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited Nov 20 at 7:37









                Jesse de Bruijne

                2,44851325




                2,44851325










                answered Nov 19 at 11:04









                Marwijn

                1,5661122




                1,5661122






























                     

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