I try to set an interval in a .ts file but I don't understand how to use a function in the same file in the interval.
To explain :
My interval setting :
this.task = setInterval(function () {
this.refreshData();
}, 300);
And my function in the same ts file :
refreshData() : void{
console.log('update...');
}
When I run on my device, I have this error :
04-19 10:38:57.535 21374-21374/com.ionicframework.app722890 I/chromium: [INFO:CONSOLE(79432)] "TypeError: this.refreshData is not a function
at file:///android_asset/www/build/main.js:10987:18
at t.invokeTask (file:///android_asset/www/build/polyfills.js:3:10284)
at Object.onInvokeTask (file:///android_asset/www/build/main.js:39626:37)
at t.invokeTask (file:///android_asset/www/build/polyfills.js:3:10220)
at e.runTask (file:///android_asset/www/build/polyfills.js:3:7637)
at invoke (file:///android_asset/www/build/polyfills.js:3:11397)
at e.args.(anonymous function) (file:///android_asset/www/build/polyfills.js:2:30193)", source: file:///android_asset/www/build/main.js (79432)
I try this way but I doesn't work :
this.task = setInterval(this.refreshData(), 300);
This call my function only one time.
Someone have an idea ?
use arrow function
this.task = setInterval(() => {
this.refreshData();
}, 300);
or store context like this
let self = this;
this.task = setInterval(function () {
self.refreshData();
}, 300);
or using bind
this.task = setInterval((function () {
this.refreshData();
}).bind(this), 300);
if only one function call:
this.task = setInterval(this.refreshData.bind(this), 300);
you could learn more about this with https://github.com/getify/You-Dont-Know-JS/tree/1st-ed/this%20%26%20object%20prototypes/ch1.md
You should use setInterval() with => arrow, as I mentioned below
setInterval(() => {
console.log('timer');
//you can call function here
},5000);
100% working.
try this:
setInterval(this.refreshData, 300);