arranging data in html table columns using angular 2

I am facing a challenge where I require each column of a table to be sorted in ascending order every time it is clicked. The sorting logic implemented is a standard JavaScript method. While this method works well in most scenarios, it encounters issues when the data contains numbers with varying digits.

Below is the code snippet:

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({
  name: 'orderBy'
})
export class OrderByPipe implements PipeTransform {

  transform(records: Array<any>, args?: any): any {

    return records.sort(function(a, b){

      if(a[args.property] === null){
        return 1 * args.direction;
      }
      else if(b[args.property] === null){
        return -1 * args.direction;
      }
      else if(a[args.property] < b[args.property]){
        return -1 * args.direction;
      }
      else if( a[args.property] > b[args.property]){
        return 1 * args.direction;
      }
      else{
        return 0;
      }
    });
  };

}

The above implementation fails to correctly sort values like 844401, 76574893632, 717613, and 6304420005555.

Instead of sorting them in descending order of magnitude as expected (76574893632 before 844401), it arranges them differently.

Answer №1

Referencing the MDN documentation:

When a compareFunction is not provided, elements are sorted by converting them to strings and comparing them in Unicode code point order. This means that "Banana" would come before "cherry". In a numeric sort scenario, where 9 comes before 80, the conversion of numbers to strings can lead to unexpected outcomes like "80" coming before "9" in Unicode order.

The code snippet here accepts an Array parameter of type any, so it's important for you to determine what data you're passing into the pipe.

Here are some possibilities:

  • If you provide an Array of strings such as

    ["844401", "76574893632", "717613", "6304420005555"]
    and use .sort() on it, the result will be
    6304420005555,717613,76574893632,844401

  • If you pass in an Array of numbers like

    [844401, 76574893632, 717613, 6304420005555]
    and utilize .sort(), the values will be treated as Unicode strings resulting in the same sorting outcome as above:
    6304420005555,717613,76574893632,844401

  • The third possibility, which seems to align with your intention, involves supplying an Array of numbers in this format:

    [844401, 76574893632, 717613, 6304420005555]
    . To ensure correct numerical sorting, you must use a compareFunction with the sort method like so: .sort( (a,b) => { return a-b } ). This will yield the desired result:
    717613,844401,76574893632,6304420005555

I've created an implementation for you on plunkr, accessible here.

Hopefully, this explanation clarifies things for you. Feel free to ask if you have any further inquiries.

Answer №2

Ensure that your numerical comparisons are accurately parsed as integers, not strings, to avoid unexpected results. Comparing numeric values as strings may lead to misleading outcomes.

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