javascript - Accessing props in .then (Reactredux) - Stack Overflow

admin管理员组

文章数量:1317365

My project is using react, redux, and redux-thunk.

I want to wait for my function to end before launching a function that clear my page. Unofortunately i have a problem accessing my function in .then

Here was my previous code without promise and then :

this.props.dispatch(ScheduleAction(..))
this.props.deleteTab()

the problem was that sometime deleteTab() is called before sending the info to my server so not very good.

then i did :

Promise.resolve(this.props.dispatch(ScheduleAction(..)))
  .then(function(response) {
         this.props.deleteTab();
         console.log("TabDeleted !!!");
         return response
   })

The problem now is that i can't access this.props.deleteTab();

And i have this as error :

Uncaught (in promise) TypeError: Cannot read property 'props' of undefined

If anyone have an idea on how to fix that by accessing props in .then, thanks in advance !!

My project is using react, redux, and redux-thunk.

I want to wait for my function to end before launching a function that clear my page. Unofortunately i have a problem accessing my function in .then

Here was my previous code without promise and then :

this.props.dispatch(ScheduleAction(..))
this.props.deleteTab()

the problem was that sometime deleteTab() is called before sending the info to my server so not very good.

then i did :

Promise.resolve(this.props.dispatch(ScheduleAction(..)))
  .then(function(response) {
         this.props.deleteTab();
         console.log("TabDeleted !!!");
         return response
   })

The problem now is that i can't access this.props.deleteTab();

And i have this as error :

Uncaught (in promise) TypeError: Cannot read property 'props' of undefined

If anyone have an idea on how to fix that by accessing props in .then, thanks in advance !!

• javascript
• reactjs
• redux
• promise
• redux-thunk

Share Improve this question Follow asked Apr 19, 2018 at 10:25 foufrixfoufrix 1,46644 gold badges2222 silver badges4949 bronze badges 1

• have you tried of defining this.props outside of your promise? Or you can also pass this.props as parameter in your .then() function parameter. – Nah Commented Apr 19, 2018 at 10:32

Add a ment  | 

3 Answers 3

Sorted by: Reset to default 10

Try this. You don't have access to this inside then. If you use arrow methods as below, you should be able to access it.

Promise.resolve(this.props.dispatch(ScheduleAction(..)))
  .then((response)=> {
         this.props.deleteTab();
         console.log("TabDeleted !!!");
         return response
   })

The problem you have here is that you lost the context of this keyword, which means this now is undefined.

Since you can access this.props outside the promise, what you want is to bind this inside your promise function by doing smth like this

Promise.resolve(this.props.dispatch(ScheduleAction(..)))
  .bind(this)
  .then(function(response) {
         this.props.deleteTab();
         console.log("TabDeleted !!!");
         return response
   })

hope this method work for you

const $this = this;
const { dispatch } = this.props;

Promise.resolve(dispatch(ScheduleAction(..)))
.then(function(response) {
  $this.deleteTab();
  console.log("TabDeleted !!!");
  return response;
})

本文标签： javascriptAccessing props in then (Reactredux)Stack Overflow