how to post associative array in ionic 3 - laravel

Question

When i try to post a data in associative array to rest api using ionic.
Only empty data receive in server side.
Is this method is correct or suggest any other method
public login(credentials) {
let apiUrl = this.urlService.apiUrl + 'oauth/access_token';
let headers = new Headers({'Content-Type' : 'application/x-www-form-urlencoded'});
let options = new RequestOptions({
headers: headers});
var postcredn=new Array();
postcredn['username'] = "karthik#abcde.in";
postcredn['password'] = "05550";
postcredn['grant_type'] = "password";
postcredn['client_id'] = "Outfit1548669";
postcredn['client_secret'] = "a10620c85033abd17716cda245";
console.log('iii'+postcredn['username'] );
return new Promise((resolve, reject) => {
this.http.post(apiUrl, postcredn, options)
.subscribe(res => {
resolve(JSON.parse(JSON.stringify(res)));
console.log('json'+ JSON.stringify(postcredn));
}, (err) => {
reject(err);
console.log(apiUrl);
});
});
}
} console.log(apiUrl);
});
});
}
}
Thanks in advance

Answer 1

Please rewrite following code:
First you need to create interface like:
export interface Postdata{
username: String;
password:String;
grant_type:String;
client_id: String;
client_secret: String;
}
Then import it and set its value:
var postcredn:Postdata;
postcredn={
username:'karthik#abcde.in',
password:'05550',
grant_type:'password',
client_id:'Outfit1548669',
client_secret:'a10620c85033abd17716cda245'
}
Finally post it via post method:
return new Promise((resolve, reject) => {
this.http.post(apiUrl, postcredn, options)
.subscribe(res => {
resolve(JSON.parse(JSON.stringify(res)));
console.log('json'+ JSON.stringify(postcredn));
}, (err) => {
reject(err);
console.log(apiUrl);
});
});

Answer 2

Associative arrays in Javascript are technically Objects and can't be instantiated via new Array(). To create one you can use any of new Object() or {}. So from the code you posted, you will define it as var postcredn=new Object(); or var postcredn={};
In your Laravel code, you can access it as you would an associative array in PHP.