Generate paging with js

paging.ts

  public paging(current, pagesize, total) {
    const totalpages = Math.ceil(total / pagesize);
    const pageInfo = {
      // Assign to the scope in paging
      totalpages: totalpages,
      // clear array before pushing new items
      pageArr: [],
    };

    // if page is 1 or 0 return, no need of paging
    if (totalpages <= 1) {
      return pageInfo;
    }

    if (totalpages <= 5) {
      for (let i = 1; i <= totalpages; i++) {
        pageInfo.pageArr.push(i);
      }
    }

    if (totalpages > 5) {
      if (current <= 3) {
        for (let i = 1; i <= 5; i++) {
          pageInfo.pageArr.push(i);
        }
        pageInfo.pageArr.push('...');
        pageInfo.pageArr.push(totalpages);
        pageInfo.pageArr.push('Next');
      } else if (totalpages - current <= 3) {
        pageInfo.pageArr.push('Prev');
        pageInfo.pageArr.push(1);
        pageInfo.pageArr.push('..');
        for (let i = totalpages - 4; i <= totalpages; i++) {
          pageInfo.pageArr.push(i);
        }
      } else {
        pageInfo.pageArr.push('Prev');
        pageInfo.pageArr.push(1);
        pageInfo.pageArr.push('..');

        for (let i = current - 2; i <= current + 2; i++) {
          pageInfo.pageArr.push(i);
        }

        pageInfo.pageArr.push('...');
        pageInfo.pageArr.push(totalpages);
        pageInfo.pageArr.push('Next');
      }
    }

    return pageInfo;
  }