CODEWITHSUNDEEP
javascriptangulartypescript
Zabs
Zabs

Reputation: 14142

Angular 4 - argument of type string[] is not assignable to type parameter of type 'string'

I have the following function that shows the following error in the TSlinting - Can anyone suggest why I am getting this error?

Argument of type 'string[]' is not assignable to type parameter of type 'string'

cancelEvent(id): any {
    let pages: Array<string> = [];
    let requestParams = new HttpParams().set('pages[]', pages);
}

Upvotes: 0

Views: 601

Answers (2)

khawar jamil
khawar jamil

Reputation: 166

HttpParams().set can set only string values.However you can do something like below

   let pages: Array<string> = [];
    let requestParams = new HttpParams().set('pages[]', pages.join(','));

and use split() to get values back into array.

Upvotes: 1

Sajeetharan
Sajeetharan

Reputation: 222532

You cannot set String[] in headers, it should be of type string,

The definition of the set method is:

set(param: string, value: string): HttpParams;

so value can be only a string.

let requestParams = new HttpParams().set('pages[]', pages); // it should be string

Upvotes: 3

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