Angular 4 params with json stringify

Question

I have to stringify some parameter to put it in a http patch request my method is something like this

let param = JSON.stringify({
code : this.code,
name : this.name,
fieldName: this.data
});

In that case I have a param like this:

code:3,name:'asdf',fieldName: 'col'

But I want the value of fieldName ond not the word fieldName... Is there a method to expand or evaluate this parameter name?

dfsq · Accepted Answer · 2017-07-07 14:30:49Z

5

If you want value of code variable to be used as a key name, then you need to use computed object property notation:

let param = JSON.stringify({
  [code]: this.code,
  [name]: this.name,
  [fieldName]: this.data
});

In the old days we would have to create object separately and assign variable keys in separate step using bracket notation:

let params = {}
params[code] = this.code
params[name] = this.name
params[fieldName] = this.data

let param = JSON.strigify(params)

answered Jul 7, 2017 at 14:30

dfsq

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2 Comments

Alessandro Celeghin Over a year ago

Thanks, I have another issue, maybe i'll open a new question...How can I prevent json stringify to convert Date? Apr 18 2017 00:00:00 GMT+0200 is stringified to: 2017-04-17T22:00:00.000Z

dfsq Over a year ago

Date will need to be represented somehow if you stringify it. You can always redefine toJSON method of date object to return whatever you need. const d = new Date; d.toJSON = () => 'Hello'; ....

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