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[英]How to group array of objects by value of object and sum the result in new property
[英]How to sum value of a property in an array of objects with AngularJs
因此,我從 nodejs api 到我的 angular 應用程序中獲得了一系列結果,它看起來像這樣
[ { "session": "2019/2020", "harmattan": [ { "course_code": "CSC104", "title": "Object Oriented Programming", "unit": 2, "status": "C", "result": { "updatedAt": "2020-12-04T11:11:54.557Z", "_id": "5fca1a8daac49e44a40a80e6", "matric_no": "U19CYS1076", "ca": 3, "exam": 48, "total": 51, "point": 3, "grade": "C" } }, { "course_code": "CSC105", "title": "Problem Solving", "unit": 3, "status": "R", "result": { "updatedAt": "2020-12-04T11:11:54.557Z", "_id": "5fca1aaaaac49e44a40a8105", "matric_no": "U19CYS1076", "ca": 3, "exam": 48, "total": 51, "point": 3, "grade": "C" } } ], "rain": [ { "course_code": "CSC101", "title": "Modelling and Simulation", "unit": 3, "status": "C", "result": { "updatedAt": "2020-12-04T11:25:38.901Z", "_id": "5fca1cd729eca3320c6245cc", "matric_no": "U19CYS1076", "ca": 3, "exam": 48, "total": 51, "point": 3, "grade": "C" } }, { "course_code": "CSC102", "title": "Introduction to Computer Science", "unit": 2, "status": "C", "result": { "updatedAt": "2020-12-04T11:25:38.901Z", "_id": "5fca1d2829eca3320c6245eb", "matric_no": "U19CYS1076", "ca": 3, "exam": 48, "total": 51, "point": 3, "grade": "C" } }, { "course_code": "CSC103", "title": "Data Structures", "unit": 2, "status": "E", "result": { "updatedAt": "2020-12-04T11:25:38.901Z", "_id": "5fca1d5429eca3320c62460a", "matric_no": "U19CYS1076", "ca": 3, "exam": 48, "total": 51, "point": 3, "grade": "C" } } ] }, { "session": "2020/2021", "harmattan": [ { "course_code": "CSC104", "title": "Object Oriented Programming", "unit": 2, "status": "C", "result": { "updatedAt": "2020-12-04T11:11:54.557Z", "_id": "5fca1a8daac49e44a40a80e6", "matric_no": "U19CYS1076", "ca": 3, "exam": 48, "total": 51, "point": 3, "grade": "C" } }, { "course_code": "CSC105", "title": "Problem Solving", "unit": 3, "status": "R", "result": { "updatedAt": "2020-12-04T11:11:54.557Z", "_id": "5fca1aaaaac49e44a40a8105", "matric_no": "U19CYS1076", "ca": 3, "exam": 48, "total": 51, "point": 3, "grade": "C" } } ], "rain": [ { "course_code": "CSC101", "title": "Modelling and Simulation", "unit": 3, "status": "C", "result": { "updatedAt": "2020-12-04T11:25:38.901Z", "_id": "5fca1cd729eca3320c6245cc", "matric_no": "U19CYS1076", "ca": 3, "exam": 48, "total": 51, "point": 3, "grade": "C" } }, { "course_code": "CSC102", "title": "Introduction to Computer Science", "unit": 2, "status": "C", "result": { "updatedAt": "2020-12-04T11:25:38.901Z", "_id": "5fca1d2829eca3320c6245eb", "matric_no": "U19CYS1076", "ca": 3, "exam": 48, "total": 51, "point": 3, "grade": "C" } }, { "course_code": "CSC103", "title": "Data Structures", "unit": 2, "status": "E", "result": { "updatedAt": "2020-12-04T11:25:38.901Z", "_id": "5fca1d5429eca3320c62460a", "matric_no": "U19CYS1076", "ca": 3, "exam": 48, "total": 51, "point": 3, "grade": "C" } } ] } ]
現在,我打算在前端實現的是:
讓我向您展示我的前端代碼現在的樣子
<div *ngFor="let result of results">
<div *ngIf="result.harmattan.length > 0">
<table class="table table-striped">
<thead>
<tr>
<th colspan="2">PROGRAM: {{userData?.department | uppercase}}</th>
<th>ACADEMIC YEAR: {{result.session}}</th>
<th colspan="2">SEMESTER: HARMATTAN</th>
</tr>
<tr class="thead-light">
<th>COURSE CODE</th>
<th>COURSE NAME</th>
<th>UNIT</th>
<th>GRADE</th>
<th>CREDIT POINT</th>
</tr>
</thead>
<tr *ngFor="let first of result.harmattan" >
<td>{{first.course_code}}</td>
<td>{{first.title}}</td>
<td>{{first.unit}}</td>
<td>{{first.result.grade}}</td>
<td>{{first.result.point * first.unit}}</td>
</tr>
<p>Total Units: **value**</p>
<p>Total Points: **value**</p>
<p>GPA: **value**</p>
<p>Cumulative Total Units: **value**</p>
<p>Cumulative Total Points: **value**</p>
<pCumulative GPA: **value**</p>
</table>
</div>
<br>
<div *ngIf="result.rain.length > 0">
<table class="table table-striped">
<thead>
<tr>
<th colspan="2">PROGRAM: {{userData?.department | uppercase}}</th>
<th>ACADEMIC YEAR: {{result.session}}</th>
<th colspan="2">SEMESTER: RAIN</th>
</tr>
<tr class="thead-light">
<th>COURSE CODE</th>
<th>COURSE NAME</th>
<th>UNIT</th>
<th>GRADE</th>
<th>CREDIT POINT</th>
</tr>
</thead>
<tr *ngFor="let second of result.rain">
<td>{{second.course_code}}</td>
<td>{{second.title}}</td>
<td>{{second.unit}}</td>
<td>{{second.result.grade}}</td>
<td>{{second.result.point * second.unit}}</td>
</tr>
<p>Total Units: **value**</p>
<p>Total Points: **value**</p>
<p>GPA: **value**</p>
<p>Cumulative Total Units: **value**</p>
<p>Cumulative Total Points: **value**</p>
<pCumulative GPA: **value**</p>
</table>
</div>
<br>
</div>
現在讓我向您展示我正在談論的圖形 output的圖形表示
鑰匙
以下是我在 typescript 文件中的內容,如果需要的話。
ngOnInit() { this.resultService.getResults() .subscribe(responseData => { this.results = responseData.results; console.log(this.results); this.userData = responseData.userData; }); }
我會在評論區。
謝謝。
可能不是最好的解決方案,但試試這個:
html:
<div *ngFor="let result of resultData; let i = index">
<div *ngIf="result.harmattan.length > 0">
<table class="table table-striped">
<thead>
<tr>
<!-- <th colspan="2">PROGRAM: {{userData?.department | uppercase}}</th> -->
<th>ACADEMIC YEAR: {{result.session}}</th>
<th colspan="2">SEMESTER: HARMATTAN</th>
</tr>
<tr class="thead-light">
<th>COURSE CODE</th>
<th>COURSE NAME</th>
<th>UNIT</th>
<th>GRADE</th>
<th>CREDIT POINT</th>
</tr>
</thead>
<tr *ngFor="let first of result.harmattan" >
<td>{{first.course_code}}</td>
<td>{{first.title}}</td>
<td>{{first.unit}}</td>
<td>{{first.result.grade}}</td>
<td>{{first.result.point * first.unit}}</td>
</tr>
<p>Total Units: {{ totalUnits(result.harmattan) }}</p>
<p>Total Points: {{ totalPoints(result.harmattan) }}</p>
<p>GPA: {{ totalGPA(result.harmattan) }}</p>
<p>Cumulative Total Units: {{cumulativeUnits(result.harmattan, i, 'harmattan')}}</p>
<p>Cumulative Total Points: {{cumulativePoints(result.harmattan, i, 'harmattan')}}</p>
<p> Cumulative GPA: {{cumulativeGPA(result.harmattan, i, 'harmattan')}}</p>
</table>
</div>
<br>
<br>
<div *ngIf="result.rain.length > 0">
<table class="table table-striped">
<thead>
<tr>
<!-- <th colspan="2">PROGRAM: {{userData?.department | uppercase}}</th> -->
<th>ACADEMIC YEAR: {{result.session}}</th>
<th colspan="2">SEMESTER: RAIN</th>
</tr>
<tr class="thead-light">
<th>COURSE CODE</th>
<th>COURSE NAME</th>
<th>UNIT</th>
<th>GRADE</th>
<th>CREDIT POINT</th>
</tr>
</thead>
<tr *ngFor="let second of result.rain">
<td>{{second.course_code}}</td>
<td>{{second.title}}</td>
<td>{{second.unit}}</td>
<td>{{second.result.grade}}</td>
<td>{{second.result.point * second.unit}}</td>
</tr>
<p>Total Units: {{ totalUnits(result.rain) }}</p>
<p>Total Points: {{ totalPoints(result.rain) }}</p>
<p>GPA: {{ totalGPA(result.rain) }}</p>
<p>Cumulative Total Units: {{cumulativeUnits(result.rain, i, 'rain')}}</p>
<p>Cumulative Total Points: {{cumulativePoints(result.rain, i, 'rain')}}</p>
<p>Cumulative GPA: {{cumulativeGPA(result.rain, i, 'rain')}}</p>
</table>
</div>
ts文件:
cumulativeUnits(result, session, semester){
let tnu = 0
var tnuHarmattan = 0;
let thisSemester = 0;
if(session == 0){
if (semester == 'harmattan'){
for(let item of this.resultData[0].harmattan){
tnuHarmattan += item.unit;
}
return tnuHarmattan;
}
else if (semester == 'rain'){
for(let item of this.resultData[0].harmattan){
tnuHarmattan += item.unit;
}
for(let item of this.resultData[0].rain){
tnu += item.unit;
}
return tnuHarmattan + tnu;
}
}
else{
if (semester == 'harmattan'){
for(let i:number = 0; i < session; i++){
for(let item of this.resultData[i].harmattan){
tnuHarmattan += item.unit;
}
for(let item of this.resultData[i].rain){
tnu += item.unit;
}
for(let item of result){
thisSemester += item.unit;
}
}
return tnuHarmattan + tnu + thisSemester;
}
else if (semester == 'rain'){
for(let i:number = 0; i <= session; i++){
for(let item of this.resultData[i].harmattan){
tnuHarmattan += item.unit;
}
for(let item of this.resultData[i].rain){
tnu += item.unit;
}
}
return tnuHarmattan + tnu;
}
}
}
cumulativePoints(result, session, semester){
let gpSemester = 0;
let guyCPRain = 0;
let guyCPharmattan = 0;
if(session == 0){
if (semester == 'harmattan'){
for(let item of this.resultData[0].harmattan){
guyCPharmattan += (item.result.point * item.unit);
}
return guyCPharmattan;
}
else if (semester == 'rain'){
for(let item of this.resultData[0].harmattan){
guyCPharmattan += (item.result.point * item.unit);
}
for(let item of this.resultData[0].rain){
guyCPRain += (item.result.point * item.unit);
}
return guyCPharmattan + guyCPRain;
}
}
else{
if (semester == 'harmattan'){
for(let i:number = 0; i < session; i++){
for(let item of this.resultData[i].harmattan){
guyCPharmattan += (item.result.point * item.unit);
}
for(let item of this.resultData[i].rain){
guyCPRain += (item.result.point * item.unit);
}
for(let item of result){
gpSemester += (item.result.point * item.unit);
}
}
return guyCPharmattan + guyCPRain + gpSemester;
}
else if (semester == 'rain'){
for(let i:number = 0; i <= session; i++){
for(let item of this.resultData[i].harmattan){
guyCPharmattan += (item.result.point * item.unit);
}
for(let item of this.resultData[i].rain){
guyCPRain += (item.result.point * item.unit);
}
}
return guyCPharmattan + guyCPRain;
}
}
}
cumulativeGPA(result, session, semester){
let tnu = 0
var tnuHarmattan = 0;
let thisSemester = 0;
let guyCPRain = 0;
let guyCPharmattan = 0;
let gpSemester = 0;
if(session == 0){
if (semester == 'harmattan'){
for(let item of this.resultData[0].harmattan){
guyCPharmattan += (item.result.point * item.unit);
tnuHarmattan += item.unit;
}
return guyCPharmattan / tnuHarmattan;
}
else if (semester == 'rain'){
for(let item of this.resultData[0].harmattan){
guyCPharmattan += (item.result.point * item.unit);
tnuHarmattan += item.unit;
}
for(let item of this.resultData[0].rain){
guyCPRain += (item.result.point * item.unit);
tnu += item.unit;
}
return ((guyCPharmattan + guyCPRain) / (tnuHarmattan + tnu)).toFixed(2);
}
}
else{
if (semester == 'harmattan'){
for(let i:number = 0; i < session; i++){
for(let item of this.resultData[i].harmattan){
guyCPharmattan += (item.result.point * item.unit);
tnuHarmattan += item.unit;
}
for(let item of this.resultData[i].rain){
guyCPRain += (item.result.point * item.unit);
tnu += item.unit;
}
for(let item of result){
thisSemester += item.unit;
gpSemester += (item.result.point * item.unit);
}
}
return ((guyCPharmattan + guyCPRain + gpSemester) / (tnuHarmattan + tnu + thisSemester)).toFixed(2);;
}
else if (semester == 'rain'){
for(let i:number = 0; i <= session; i++){
for(let item of this.resultData[i].harmattan){
guyCPharmattan += (item.result.point * item.unit);
tnuHarmattan += item.unit;
}
for(let item of this.resultData[i].rain){
guyCPRain += (item.result.point * item.unit);
tnu += item.unit;
}
}
return ((guyCPharmattan + guyCPRain) / (tnuHarmattan + tnu)).toFixed(2);
}
}
}
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