javascript - React, undefined this -

i'm calling function child component:

removeworkout: function (workoutid) {  return axios.delete('/delete', {         params: {           id: workoutid         }       }   .then(function(response){         this.componentdidmount();   }); }, 

server deletes record :

app.delete('/delete/:id?', (req, res) => {   exr.find({'_id':req.query.id}).remove().exec();   console.log("server deleting")   res.send("done") }); 

but this.componentdidmount doesn't work, because undefined. other functions work .

its binding issue, need bind context using .bind(this) or use arrow function, arrow function job you.

use this:

.then( (response) => {       this.componentdidmount();  }); 

or

.then( function(response) {       this.componentdidmount();  }.bind(this));