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[英]How to display the contents of a JSON object with multiple arrays in angular html?
[英]How to display nested json arrays into html table with material angular
我正在嘗試將嵌套的 json 數組顯示到我的材料 angular 表中。 如果我的 json 沒有嵌套的 arrays,我的數據工作正常。
Json
{
"rows": [
{
"mst": {
"field": "createDate",
"value": "2017-06-02"
},
"gsc": {
"field": "Account/Audit/Creation/Date",
"value": "2017-06-02"
}
},
{
"mst": {
"field": "startDate"
},
"gsc": {
"field": "startDate"
}
},
{
"mst": {
"field": "status",
"value": "ACTIVE"
},
"gscs": [
{
"field": "Account/LineOfBusiness/Type~Status",
"value": "C~A"
},
{
"field": "Account/LineOfBusiness/Type~Status",
"value": "I~A"
}
],
"gscvalue": "Active"
},
{
"mst": {
"field": "statusDate"
},
"gsc": {
"field": "statusDate"
}
},
{
"mst": {
"field": "statusReason"
},
"gsc": {
"field": "statusReason"
}
},
{
"mst": {
"field": "deliveryMethod",
"value": "PAPER"
},
"gscs": [
{
"field": "Electronic",
"value": "N"
},
{
"field": "ElectronicOutsourced",
"value": "N"
},
{
"field": "Hardcopy",
"value": "Y"
}
],
"gscvalue": "Paper"
},
{
"mst": {
"field": "statementFormat",
"value": "Standard"
},
"gsc": {
"field": "?"
}
},
{
"mst": {
"field": "statementLanguagePreference",
"value": "Spanish"
},
"gsc": {
"field": "Account/Language",
"value": "S"
},
"gscvalue": "Spanish"
},
{
"mst": {
"field": "type",
"value": "RES"
},
"gsc": {
"field": "Account/Type",
"value": "RES"
}
}
]
}
HTML
<div class="example-container mat-elevation-z8" *ngIf="rows?.length>0">
<table mat-table [dataSource]="dataSource">
<ng-container matColumnDef="mst Fields">
<th mat-header-cell *matHeaderCellDef> mst Fields </th>
<td mat-cell *matCellDef="let row" class="tablePadding"> {{row.mst.field}} </td>
</ng-container>
<ng-container matColumnDef="mst">
<th mat-header-cell *matHeaderCellDef> mst value </th>
<td mat-cell *matCellDef="let row"> {{row.mst.value}} </td>
</ng-container>
<ng-container matColumnDef="gsc Fields">
<th mat-header-cell *matHeaderCellDef> gsc Fields </th>
<td mat-cell *matCellDef="let row"> {{row.gsc.field}} </td>
</ng-container>
<ng-container matColumnDef="gsc">
<th mat-header-cell *matHeaderCellDef> gsc value </th>
<td mat-cell *matCellDef="let row"> {{row.gsc.value}} </td>
</ng-container>
<tr mat-header-row *matHeaderRowDef="displayedColumns; sticky: true"></tr>
<tr mat-row *matRowDef="let row; columns: displayedColumns; let row"></tr>
模態的.ts
export class ResultField {
field: string;
value: string;
valueList: string[];
}
export class ResultRow {
mst: ResultField;
gsc: ResultField;
gscs: ResultField[];
gscValue: String;
}
我當前的表將一直顯示數據,直到達到 mst.field{status}。 我收到一個錯誤
SystemComponent.html:29 ERROR TypeError: Cannot read property 'field' of undefined
我知道這個錯誤的出現是因為我的 html 中的當前邏輯。 我該如何解決這個問題?
因此,我不希望 gscs.field 在單獨的列中,我希望將這些值放入 gsc.field 列和 gsc.value 列中的 gscValue 。
試圖
<ng-container matColumnDef="gsc Fields">
<th mat-header-cell *matHeaderCellDef> gsc Fields </th>
<td mat-cell *matCellDef="let row" *ngIf="row.gsc.field"> {{row.gsc.field}} </td>
<td mat-cell *matCellDef="let row" *ngIf="row.gsc.field"> {{row.gscs.field}} </td>
</ng-container>
但是對於 angular 邏輯,標簽中只能有一個 * 指令。
我最接近的參考是需要在材料數據表中顯示嵌套 JSON Object但沒有可靠的答案。
嘗試 2
我嘗試使用更簡單的方法來打印我的數據。
<div>
<h1>Testing</h1>
<div *ngFor="let row of rows">
<!-- <p *ngIf="row.gsc.field">{{row.gsc.field}}</p>
<p *ngIf="row.gsc.value">{{row.gsc.value}}</p> -->
<p>{{row.mst.field}}</p>
<p>{{row.mst.value}}</p>
<div *ngFor= "let gscs of row.gscs">
<p *ngIf="gscs.field">{{gscs.field}}</p>
<p *ngIf="gscs.value">{{gscs.value}}</p>
</div>
<p *ngIf = "row.gscvalue">{{row.gscvalue}}</p>
</div>
</div>
使用此代碼片段,我可以提取嵌套值,但是當我取消注釋這兩行時,我得到與上面相同的錯誤。
<!-- <p *ngIf="row.gsc.field">{{row.gsc.field}}</p>
<p *ngIf="row.gsc.value">{{row.gsc.value}}</p> -->
錯誤類型錯誤:無法讀取未定義的屬性“字段”
使用上面提供的 JSON,我想創建一個如下圖所示的表。
好像你只需要嵌套你的ngIf
:
<ng-container matColumnDef="gsc Fields">
<th mat-header-cell *matHeaderCellDef> gsc Fields </th>
<td mat-cell *matCellDef="let row">
<ng-container *ngIf="row.gsc?.field; else fieldArray">
{{row.gsc.field}}
</ng-container>
<ng-template #fieldArray>
<div class="sub-cell" *ngFor="let field of row.gscs"> <!-- need the appropriate css -->
{{field.field}} {{field.value}}
</div>
</ng-template>
</td>
</ng-container>
在你的價值列中,你想要更多:
<ng-container matColumnDef="gsc">
<th mat-header-cell *matHeaderCellDef> gsc value </th>
<td mat-cell *matCellDef="let row"> {{row.gsc?.value || row.gscvalue}} </td>
</ng-container>
不確定這是 100%,但應該接近
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