Server-Side Pagination Using ASP.NET Core and Angular 8 - Part Three
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Join For FreeIntroduction
In this article, we will learn how to create server-side paging, which is very useful whenever we have to display a large number of records.
This article will be the final part of our three-part series. You can check out the first and second parts by clicking on the below links:
- Server Side Pagination using ASP.NET Core and Angular 8-Part 1
- Server Side Pagination using ASP.NET Core and Angular 8-Part 2
In the second part, we implemented a previous and next button. In this last part, we are sorting our data on click on headings in ascending and descending order.
So here, we are displaying the number of records. With that, our program will calculate the number of pages, but in one page, we can see only the selected records, so rather than fetching all the records at one time, we are going to fetch records based on pages. This will increase our performance.
How Will it Work?
In Part 2, we were working on the Prev and Next button and their logic. Here we are sorting the records based on ascending and descending order, so when we click on the header column name it will get the related number of records in order by column name.
Back End
We will do the back-end code using SQL server. In the first part, we already have created a database and necessary tables, so no need to create it again. However, we will make a small change in the stored procedure. So we are sorting the data ascending or descending after we click on table headings on the screen. For that, I am using case statements so that it will manipulate records according to column name.
SQL
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1
USE [Company]
2
GO
3
/****** Object: StoredProcedure [dbo].[Usp_GetAllCompanies] Script Date: 1/17/2020 11:05:09 PM ******/
4
SET ANSI_NULLS ON
5
GO
6
SET QUOTED_IDENTIFIER ON
7
GO
8
ALTER Proc [dbo].[Usp_GetAllCompanies]
9
@PageNo INT ,
10
@PageSize INT ,
11
@SortOrder VARCHAR(200)
12
As
13
Begin
14
15
Select * From (Select ROW_NUMBER() Over (
16
Order by
17
CASE WHEN @SortOrder = 'CompanyName_ASC' THEN CompanyName
18
END ASC,
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CASE WHEN @SortOrder = 'CompanyName_DESC' THEN CompanyName
20
END DESC,
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CASE WHEN @SortOrder = 'City_ASC' THEN City
22
END ASC,
23
CASE WHEN @SortOrder = 'City_DESC' THEN City
24
END DESC,
25
CASE WHEN @SortOrder = 'State_ASC' THEN [State]
26
END ASC,
27
CASE WHEN @SortOrder = 'State_DESC' THEN [State]
28
END DESC,
29
CASE WHEN @SortOrder = 'Owner_ASC' THEN [Owner]
30
END ASC,
31
CASE WHEN @SortOrder = 'Owner_DESC' THEN [Owner]
32
END DESC,
33
CASE WHEN @SortOrder = 'Year_ASC' THEN PublishYear
34
END ASC,
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CASE WHEN @SortOrder = 'Year_DESC' THEN PublishYear
36
END DESC
37
38
) AS 'RowNum', *
39
from [CompanyDetails]
40
)t where t.RowNum Between ((@PageNo-1)*@PageSize +1) AND (@PageNo*@pageSize)
41
42
End
Front End
This is a stepwise process where we are going to change some of the code in some files without wasting any time adding components and services.
Step 1
Let's copy this HTML code and replace it to the pagination.html file. Some change compared to the previous part of the code. Here we are adding a new click event called "sortByHeading". By default, it will fetch the records with company Name in ascending order. If we click that same heading, it will again hit the API and fetch the records in descending order. Also, I am applying CSS for the heading color, so if you click on a different header, then it will fetch the records based on that header name in ascending order and active color will apply to that particular header.
HTML
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1
<div class="row">
2
<div class="col-12 col-md-12">
3
<div class="card">
4
<div class="card-header">
5
<div class="row">
6
<div>
7
Companies 1-{{pageSize}} (Total:{{totalCompaniesCount}})
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</div>
9
10
<div style="margin: auto;" class="add-row add-row-rel top-paging">
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<span class="cpp">Companies per page:</span>
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<a (click)="setRecPerPage(small)" [ngClass]="smallPageRow? 'active':'mr-2'">{{small}}</a>
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<a (click)="setRecPerPage(medium)" [ngClass]="mediumPageRow? 'active':'mr-2'">{{medium}}</a>
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<a (click)="setRecPerPage(large)" [ngClass]="largePageRow? 'active':'mr-2'">{{large}}</a>
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</div>
16
</div>
17
18
</div>
19
<div class="card-body position-relative">
20
<div class="tbl-note-dentist">
21
Sort list by select <span>table headers</span>, click again to reorder
22
ascending/descending
23
</div>
24
<div class="table-responsive cnstr-record companie-tbl">
25
<table class="table table-bordered heading-hvr">
26
<thead>
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<tr>
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<th style="cursor: pointer;" [ngClass]="order =='CompanyName'? 'headActive':''"
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(click)="sortByHeading('CompanyName')" width="80">Company Name.</th>
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<th style="cursor: pointer;" [ngClass]="order =='City'? 'headActive':''"
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(click)="sortByHeading('City')" width="75">City</th>
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<th [ngClass]="order =='State'? 'headActive':''" style="cursor: pointer;"
33
(click)="sortByHeading('State')">State
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</th>
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<th [ngClass]="order =='Owner'? 'headActive':''" style="cursor: pointer;" (click)="sortByHeading('Owner')"
36
width="75">CEO
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</th>
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<th [ngClass]="order =='Year'? 'headActive':''" style="cursor: pointer; width:250px"
39
(click)="sortByHeading('Year')">Publish Year</th>
40
</tr>
41
</thead>
42
<tbody>
43
<tr *ngFor="let item of companies">
44
<td>{{item.CompanyName}}</td>
45
<td>{{item.City}}</td>
46
<td>{{item.State}}</td>
47
<td>{{item.Owner}}</td>
48
<td>{{item.PublishYear}}</td>
49
50
</tr>
51
</tbody>
52
</table>
53
54
55
</div>
56
<!-- Code by pagination -->
57
<div class="container mw-100">
58
<div class="row">
59
<div class="col-md-3"> </div>
60
<div *ngIf="companies !=0" class="col-md-6">
61
<ul class="pagination justify-content-center">
62
<li class="page-item">
63
<a (click)="showPrevCompanies()"
64
[ngClass]="(paginationService.showNoOfCurrentPage ==1)?'notAllowed':'page-link'"
65
style="margin-top: 5px; margin-right: 20px;cursor: pointer;">Prev</a></li>
66
<li *ngFor="let page of pageField;let i=index" class="page-item">
67
<a (click)="showCompaniesByPageNumber(page,i)" [ngClass]="pageNumber[i] ? 'pageColor':'page-link'"
68
style=" margin-right: 5px;;margin-top: 5px;cursor: pointer;">{{page}}</a>
69
70
</li>
71
<li class="page-item"><a (click)="showNextCompanies()"
72
[ngClass]="(paginationService.disabledNextBtn)?'notAllowed':'page-link'"
73
style="margin-top: 5px;margin-left: 20px; cursor: pointer;">Next</a> </li>
74
</ul>
75
<div style="text-align: center;">
76
Page {{currentPage}} of Total page {{paginationService.exactPageList}}
77
</div>
78
</div>
79
</div>
80
</div>
81
</div>
82
</div>
83
</div>
84
</div>
Step 2
There are some changes in the CSS file, so just replace this code with pagination.component.css.
CSS
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1
@charset "utf-8";
2
/* CSS Document */
3
@media all{
4
*{padding:0px;margin:0px;}
5
div{vertical-align:top;}
6
img{max-width:100%;}
7
html {font-smoothing:antialiased; osx-font-smoothing:grayscale;}
8
body{overflow:auto!important; width:100%!important;}
9
html, body{background-color:#e4e5e6;}
10
html {position:relative; min-height:100%;}
11
12
13
.card{border-radius:4px;}
14
.card-header:first-child {border-radius:4px 4px 0px 0px;}
15
16
/*Typekit*/
17
html, body{font-family:'Roboto', sans-serif; font-weight:400; font-size:13px;}
18
body{padding-top:52px;}
19
20
p{font-family:'Roboto', sans-serif; color:#303030; font-weight:400; margin-bottom:1rem;}
21
input, textarea, select{font-family:'Roboto', sans-serif;}
22
23
h1,h2,h3,h4,h5,h6{font-family:'Roboto', sans-serif; font-weight:700;}
24
h1{font-size:20px; color:#000000; margin-bottom:10px;}
25
h2{font-size:30px;}
26
h3{font-size:24px;}
27
h4{font-size:18px;}
28
h5{font-size:14px;}
29
h6{font-size:12px;}
30
31
.row {margin-right:-8px; margin-left:-8px;}
32
.col, .col-1, .col-10, .col-11, .col-12, .col-2, .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-9, .col-auto, .col-lg, .col-lg-1, .col-lg-10, .col-lg-11, .col-lg-12, .col-lg-2, .col-lg-3, .col-lg-4, .col-lg-5, .col-lg-6, .col-lg-7, .col-lg-8, .col-lg-9, .col-lg-auto, .col-md, .col-md-1, .col-md-10, .col-md-11, .col-md-12, .col-md-2, .col-md-3, .col-md-4, .col-md-5, .col-md-6, .col-md-7, .col-md-8, .col-md-9, .col-md-auto, .col-sm, .col-sm-1, .col-sm-10, .col-sm-11, .col-sm-12, .col-sm-2, .col-sm-3, .col-sm-4, .col-sm-5, .col-sm-6, .col-sm-7, .col-sm-8, .col-sm-9, .col-sm-auto, .col-xl, .col-xl-1, .col-xl-10, .col-xl-11, .col-xl-12, .col-xl-2, .col-xl-3, .col-xl-4, .col-xl-5, .col-xl-6, .col-xl-7, .col-xl-8, .col-xl-9, .col-xl-auto {padding-right:8px; padding-left:8px;}
33
34
.card-header{background-color:#f0f3f5; border-bottom:1px solid #c8ced3; font-size:13px; font-weight:600; color:#464646; text-transform:uppercase; padding:.75rem 8px;}
35
36
37
.cnstr-record th{white-space:nowrap;padding:.45rem .2rem; font-size:13px; border-bottom-width:0px!important;}
38
.cnstr-record thead{background:#f0f3f5;}
39
40
.cnstr-record .form-control{font-size:13px; padding:0px 0rem 0px 0.2rem; height:calc(2rem + 2px);}
41
.cnstr-record select.form-control{padding-left:.05rem;}
42
.cnstr-record .table td, .cnstr-record .table th {vertical-align:middle;}
43
.cnstr-record .table td{padding:.3rem;}
44
.cnstr-record .table td h4{margin:0px;}
45
46
.wp-50{width:50px;}
47
.wp-60{width:60px;}
48
.wp-70{width:70px;}
49
.wp-80{width:80px;}
50
.wp-90{width:90px;}
51
.wp-100{width:100px;}
52
.mw-auto{min-width:inherit;}
53
.expand-row{width:100%; border:solid 1px #596269; display:inline-block; border-radius:3px; width:16px; height:16px; vertical-align:top; background:#596269; color:#ffffff!important;}
54
.expand-row img{vertical-align:top; position:relative; top:2px;}
55
.sub-table th{font-weight:400; font-size:12px;}
56
.sub-table td{background:#efefef;}
57
.no-bg td{background:inherit;}
58
.mw-100{max-width:100%;}
59
60
61
62
.activeTabColor{
63
color: #fff;
64
background-color: #000000;
65
}
66
.page-item:first-child .page-link {
67
margin-left: 0;
68
border-top-left-radius: .25rem;
69
border-bottom-left-radius: .25rem;
70
}
71
72
.pageColor{
73
position: relative;
74
display: block;
75
padding: .5rem .75rem;
76
margin-left: -1px;
77
line-height: 1.25;
78
color: white!important;
79
background-color: black!important;
80
border: 1px solid #dee2e6;
81
}
82
.notAllowed{
83
position: relative;
84
display: block;
85
padding: .5rem .75rem;
86
margin-left: -1px;
87
line-height: 1.25;
88
color: #007bff;
89
background-color: #fff;
90
border: 1px solid #dee2e6;
91
cursor: not-allowed;
92
}
93
.page-link {
94
position: relative;
95
display: block;
96
padding: .5rem .75rem;
97
margin-left: -1px;
98
line-height: 1.25;
99
color: #007bff;
100
background-color: #fff;
101
border: 1px solid #dee2e6;
102
}
103
104
.mr-2{
105
background-color: #007bff;
106
color: white!important;
107
margin: 5px;
108
padding: 5px;
109
cursor: pointer;
110
}
111
.active{
112
background-color: black;
113
color: white!important;
114
margin: 5px;
115
padding: 5px;
116
cursor: pointer;
117
}
118
.headActive{
119
color: red;
120
}
121
122
}
Step 3
Copy the below code and replace it with pagination.component.ts 's
sortByHeading method.
TypeScript
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1
import { Component, OnInit } from '@angular/core';
2
import { ApiService } from './api.service';
3
import { PaginationService } from './pagination.service';
4
import { CompaniesPerPage } from './CompaniesPerPage';
5
6
@Component({
7
selector: 'app-pagination',
8
templateUrl: './pagination.component.html',
9
styleUrls: ['./pagination.component.css']
10
})
11
export class PaginationComponent implements OnInit {
12
13
companies = [];
14
pageNo: any = 1;
15
pageNumber: boolean[] = [];
16
sortOrder: any = 'CompanyName_ASC';
17
order:any='CompanyName';
18
//Pagination Variables
19
//Page Row variables
20
smallPageRow: boolean = true;
21
mediumPageRow: boolean = false;
22
largePageRow: boolean = false;
23
24
small = CompaniesPerPage.small;
25
medium = CompaniesPerPage.medium;
26
large = CompaniesPerPage.large;
27
28
pageField = [];
29
exactPageList: any;
30
paginationData: number;
31
companiesPerPage: any = CompaniesPerPage.small;
32
orderBy: string='Asc';
33
34
totalCompanies: any;
35
totalCompaniesCount: any;
36
currentPage = 1;
37
38
constructor(public service: ApiService, public paginationService: PaginationService) { }
39
40
ngOnInit() {
41
this.pageNumber[0] = true;
42
this.paginationService.temppage = 0;
43
this.getAllCompanies();
44
}
45
getAllCompanies() {
46
this.service.getAllCompanies(this.pageNo, this.companiesPerPage, this.sortOrder).subscribe((data: any) => {
47
this.companies = data;
48
this.getAllCompaniesCount();
49
})
50
}
51
getAllCompaniesCount() {
52
this.service.getAllCompaniesCount().subscribe((res: any) => {
53
this.totalCompaniesCount = res;
54
this.totalNoOfPages();
55
})
56
}
57
58
//Method For Pagination
59
totalNoOfPages() {
60
61
this.paginationData = Number(this.totalCompaniesCount / this.companiesPerPage);
62
let tempPageData = this.paginationData.toFixed();
63
if (Number(tempPageData) < this.paginationData) {
64
this.exactPageList = Number(tempPageData) + 1;
65
this.paginationService.exactPageList = this.exactPageList;
66
} else {
67
this.exactPageList = Number(tempPageData);
68
this.paginationService.exactPageList = this.exactPageList
69
}
70
this.paginationService.pageOnLoad();
71
this.pageField = this.paginationService.pageField;
72
73
}
74
showCompaniesByPageNumber(page, i) {
75
this.companies = [];
76
this.pageNumber = [];
77
this.pageNumber[i] = true;
78
this.pageNo = page;
79
this.currentPage =page;
80
this.getAllCompanies();
81
}
82
83
//Pagination Start
84
85
showPrevCompanies() {
86
87
if (this.paginationService.showNoOfCurrentPage != 1) {
88
this.paginationService.prevCompanies();
89
this.pageNumber = [];
90
this.pageNumber[0] = true;
91
this.currentPage = this.paginationService.pageField[0];
92
this.getAllCompanies();
93
}
94
95
}
96
97
showNextCompanies() {
98
99
if (this.paginationService.disabledNextBtn == false) {
100
this.pageNumber = [];
101
this.paginationService.nextCompanies();
102
this.pageNumber[0] = true;
103
this.currentPage = this.paginationService.pageField[0];
104
this.getAllCompanies();
105
}
106
}
107
sortByHeading(value: string, id) {
108
this.companies = [];
109
this.sortOrder = value;
110
this.order =value;
111
if (this.orderBy == "Desc") {
112
this.orderBy = "Asc"
113
this.sortOrder =this.sortOrder+'_ASC';
114
} else {
115
this.orderBy = "Desc";
116
this.sortOrder =this.sortOrder+'_DESC'
117
}
118
this.getAllCompanies();
119
}
120
121
setRecPerPage(noOfRec) {
122
123
this.companies = [];
124
this.pageNumber = [];
125
this.pageNumber[0] = true;
126
this.paginationService.temppage = 0;
127
if (noOfRec == CompaniesPerPage.small) {
128
this.smallPageRow = true;
129
this.mediumPageRow = false;
130
this.largePageRow = false;
131
this.companiesPerPage = noOfRec;
132
this.currentPage = 1;
133
this.pageNumber[0] = true;
134
this.getAllCompanies();
135
136
}
137
else if (noOfRec == CompaniesPerPage.medium) {
138
this.smallPageRow = false;
139
this.mediumPageRow = true;
140
this.largePageRow = false;
141
this.companiesPerPage = noOfRec;
142
this.currentPage = 1;
143
this.pageNumber[0] = true;
144
this.getAllCompanies();
145
146
} else {
147
this.smallPageRow = false;
148
this.mediumPageRow = false;
149
this.largePageRow = true;
150
this.companiesPerPage = noOfRec;
151
this.currentPage = 1;
152
this.pageNumber[0] = true;
153
this.getAllCompanies();
154
155
}
156
//this.pageSize = page;
157
}
158
}
Step 6
The pagination.service.ts file is the same; no changes needed here, but I am still mentioning it for reference.
TypeScript
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1
import {
2
Injectable
3
} from '@angular/core';
4
import {
5
CompaniesPerPage
6
} from './CompaniesPerPage';
7
@Injectable()
8
export class PaginationService {
9
//Pagination Variables
10
pageNumberPerPage = 0;
11
pageNumberShow = CompaniesPerPage.displayNoOfPagesPerPage;
12
temppage: number = 0;
13
disabledNextBtn: boolean;
14
disabledPrevBtn: boolean = true;
15
pageField = [];
16
exactPageList: any;
17
prevtrue: boolean;
18
nexttrue: boolean;
19
currentPage = 1;
20
pageNumber: boolean[] = [];
21
showNoOfCurrentPage: any = 1;
22
showPageOnlyOntabsChange: boolean = true;
23
lastPage: any = 0;
24
constructor() {}
25
// On page load
26
pageOnLoad() {
27
if (this.temppage == 0) {
28
this.pageField = [];
29
for (var a = 0; a < this.pageNumberShow; a++) {
30
this.pageField[a] = this.temppage + 1;
31
this.temppage = this.temppage + 1;
32
if (this.exactPageList == this.pageField[a]) {
33
for (var b = 0; b < this.pageNumberShow - 7; b++) {
34
if (a == b) {
35
this.temppage = this.temppage - (b + 1);
36
this.prevtrue = false;
37
break;
38
}
39
}
40
this.disabledNextBtn = true;
41
break;
42
} else {
43
this.disabledNextBtn = false;
44
}
45
}
46
}
47
}
48
prevCompanies() {
49
this.pageNumber[0] = true;
50
this.nexttrue = true;
51
if (this.showNoOfCurrentPage != 1) {
52
this.disabledNextBtn = false;
53
this.showNoOfCurrentPage = this.showNoOfCurrentPage - 1;
54
if (this.prevtrue) {
55
if (this.lastPage == 0) {
56
this.temppage = this.temppage - 10;
57
this.prevtrue = false;
58
} else {
59
this.temppage = this.lastPage;
60
this.nexttrue = false;
61
this.prevtrue = false;
62
this.lastPage = 0;
63
}
64
}
65
for (var a = this.pageNumberShow - 1; a >= 0; a--) {
66
this.pageField[a] = this.temppage;
67
this.temppage = this.temppage - 1;
68
}
69
if (this.temppage == 0) {
70
this.showPageOnlyOntabsChange = false;
71
}
72
this.currentPage = this.pageField[0];
73
}
74
}
75
nextCompanies() {
76
if (this.disabledNextBtn == false) {
77
this.disabledPrevBtn = false;
78
this.pageField = [];
79
this.prevtrue = true;
80
this.showNoOfCurrentPage = this.showNoOfCurrentPage + 1;
81
this.pageNumber[0] = true;
82
if (this.nexttrue) {
83
this.temppage = this.temppage + 10;
84
this.nexttrue = false;
85
}
86
for (var a = 0; a < this.pageNumberShow; a++) {
87
this.pageField[a] = this.temppage + 1;
88
this.temppage = this.temppage + 1;
89
if (this.exactPageList == this.pageField[a]) {
90
this.lastPage = this.pageField[a];
91
this.lastPage = this.lastPage - (a + 1);
92
for (var b = 0; b < this.pageNumberShow - 7; b++) {
93
if (a == b) {
94
this.temppage = this.temppage - (b + 1);
95
//this.prevtrue = false;
96
break;
97
}
98
}
99
this.disabledNextBtn = true;
100
break;
101
} else {
102
this.disabledNextBtn = false;
103
}
104
}
105
this.currentPage = this.pageField[0];
106
}
107
}
108
}
The coding is done. Now, it's time to check the output by using the command
ng serve -o.
Conclusion
This article wraps up the complete series of server-side pagination. I explained how to display a selected number of records per page and a next and previous button by applying different approaches and sorting the data using a click on the header using Angular 8 and ASP.NET.
This is part 3 of server-side pagination.
This is the last part, so in the next article, we are going to learn new things. Time for some motivational quotes... "The secret of getting ahead is getting started". Last but not least, your feedback is very important so that I get a chance to improve myself. For that, I need your valuable comments. Good comments I will take as motivation and critique as the impetus for me to improve.
Please let me know if you liked and understood this article and how I could improve it. For any questions about this article regarding code or something, please leave a comment.
ASP.NET
Database
ASP.NET Core
AngularJS
code style
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