Formatting the string value

Question

Formatting the string value

Having trouble formatting the input value. Take a look at this code snippet:

<input
  type="text"
  class="form-control"
  name="time"
  formControlName="time"
  (input)="convertToMinute($event.target.value)"
/>

Here is the function in question:

 convertToMinute(value: string) {
    console.log(value);
    let minute = value.slice(0, 2);
    let seconds = value.slice(2, 4);
    let result = minute + ":" + seconds;
    console.log(result);
  }

The issue occurs when entering 500, resulting in 50:0 instead of 05:00. How can this be fixed?

angular typescript

Answer 1

Answer №1

We offer a variety of built-in pipes for easy data manipulation. For more details, you can refer to the documentation provided at https://angular.io/api/common/DatePipe. The 4th option seems to align with what you are searching for.

{{ dateObj | date }}               // output: 'Jun 15, 2015'
{{ dateObj | date:'medium' }}      // output: 'Jun 15, 2015, 9:43:11 PM'
{{ dateObj | date:'shortTime' }}   // output: '9:43 PM'
{{ dateObj | date:'mm:ss' }}       // output: '43:11'

Answer 2

We offer a variety of built-in pipes for easy data manipulation. For more details, you can refer to the documentation provided at https://angular.io/api/common/DatePipe. The 4th option seems to align with what you are searching for.

{{ dateObj | date }}               // output: 'Jun 15, 2015'
{{ dateObj | date:'medium' }}      // output: 'Jun 15, 2015, 9:43:11 PM'
{{ dateObj | date:'shortTime' }}   // output: '9:43 PM'
{{ dateObj | date:'mm:ss' }}       // output: '43:11'

Answer 3

Answer №2

If you need to add padding to a raw value, you can utilize the padStart() method.

For more information on how to use padStart(), check out: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/padStart

let raw_val = '500';

let full_val = raw_val.padStart(4, '0');


let minutes = full_val.slice(0,2);
let seconds = full_val.slice(2);

console.log(`${minutes}:${seconds}`);

The expected output of the code is:

 "05:00"

You can also view and edit this code snippet on JS Bin here: https://jsbin.com/ruyerafepe/edit?js,console

Answer 4

If you need to add padding to a raw value, you can utilize the padStart() method.

For more information on how to use padStart(), check out: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/padStart

let raw_val = '500';

let full_val = raw_val.padStart(4, '0');


let minutes = full_val.slice(0,2);
let seconds = full_val.slice(2);

console.log(`${minutes}:${seconds}`);

The expected output of the code is:

 "05:00"

You can also view and edit this code snippet on JS Bin here: https://jsbin.com/ruyerafepe/edit?js,console

Answer 5

Answer №3

When the input type is text, it seems that the pipe option might not be effective.

 function convertToMinute(value: string) {
       console.log(value);
       let seconds = value.slice(value.length-2, value.length);
       console.log(seconds);
       let minute = '';
       if((value.length-seconds.length)<2) {
         minute = '0'+value.slice(0, 1);
       } else {
         minute = value.slice(0, 2);
       }

       let result = minute + ":" + seconds;
       console.log(result);
  }

Answer 6

When the input type is text, it seems that the pipe option might not be effective.

 function convertToMinute(value: string) {
       console.log(value);
       let seconds = value.slice(value.length-2, value.length);
       console.log(seconds);
       let minute = '';
       if((value.length-seconds.length)<2) {
         minute = '0'+value.slice(0, 1);
       } else {
         minute = value.slice(0, 2);
       }

       let result = minute + ":" + seconds;
       console.log(result);
  }

Formatting the string value

Answer №1

Answer №2

Answer №3

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