title: Angular Material Data Table is not getting filled with data
body: <p>I am using Angular Material and want to show a data table inside a custom modal and the data is not getting filled in, even not the header titles. Everything is empty.</p>
  
  <p>Here is my History modal component:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>import { Component, OnInit } from "@angular/core";
  
  @Component({
    selector: "app-history",
    templateUrl: "./history.component.html",
    styleUrls: ["./history.component.scss"]
  })
  export class HistoryComponent implements OnInit {
    displayedColumns = ["position", "name", "weight", "symbol"];
    dataSource = ELEMENT_DATA;
  
    constructor() { }
  
    ngOnInit() {
    }
  
  }
  
  export interface Element {
    name: string;
    position: number;
    weight: number;
    symbol: string;
  }
  const ELEMENT_DATA: Element[] = [
    {position: 1, name: "Hydrogen", weight: 1.0079, symbol: "H"},
    {position: 2, name: "Helium", weight: 4.0026, symbol: "He"},
    {position: 3, name: "Lithium", weight: 6.941, symbol: "Li"},
    {position: 4, name: "Beryllium", weight: 9.0122, symbol: "Be"},
    {position: 5, name: "Boron", weight: 10.811, symbol: "B"},
    {position: 6, name: "Carbon", weight: 12.0107, symbol: "C"},
    {position: 7, name: "Nitrogen", weight: 14.0067, symbol: "N"},
    {position: 8, name: "Oxygen", weight: 15.9994, symbol: "O"},
    {position: 9, name: "Fluorine", weight: 18.9984, symbol: "F"},
    {position: 10, name: "Neon", weight: 20.1797, symbol: "Ne"},
    {position: 11, name: "Sodium", weight: 22.9897, symbol: "Na"},
    {position: 12, name: "Magnesium", weight: 24.305, symbol: "Mg"},
    {position: 13, name: "Aluminum", weight: 26.9815, symbol: "Al"},
    {position: 14, name: "Silicon", weight: 28.0855, symbol: "Si"},
    {position: 15, name: "Phosphorus", weight: 30.9738, symbol: "P"},
    {position: 16, name: "Sulfur", weight: 32.065, symbol: "S"},
    {position: 17, name: "Chlorine", weight: 35.453, symbol: "Cl"},
    {position: 18, name: "Argon", weight: 39.948, symbol: "Ar"},
    {position: 19, name: "Potassium", weight: 39.0983, symbol: "K"},
    {position: 20, name: "Calcium", weight: 40.078, symbol: "Ca"},
  ];</code></pre>
  <pre class="snippet-code-css lang-css prettyprint-override"><code>:host {
    display: flex;
  }
  
  .example-container {
    display: flex;
    flex-direction: column;
    min-width: 300px;
    overflow: auto;
    max-height: 500px;
  }
  
  .mat-header-cell.mat-sort-header-sorted {
    color: black;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;h2 mat-dialog-title&gt;History&lt;/h2&gt;
  &lt;!-- &lt;mat-dialog-content class="example-container"&gt; --&gt;
    &lt;div class="example-container"&gt;
      &lt;mat-table #table [dataSource]="dataSource" matSort&gt;
  
        &lt;!-- Position Column --&gt;
        &lt;ng-container matColumnDef="position"&gt;
          &lt;th mat-header-cell *matHeaderCellDef mat-sort-header&gt; No. &lt;/th&gt;
          &lt;td mat-cell *matCellDef="let element"&gt; {{element.position}} &lt;/td&gt;
        &lt;/ng-container&gt;
  
        &lt;!-- Name Column --&gt;
        &lt;ng-container matColumnDef="name"&gt;
          &lt;th mat-header-cell *matHeaderCellDef mat-sort-header&gt; Name &lt;/th&gt;
          &lt;td mat-cell *matCellDef="let element"&gt; {{element.name}} &lt;/td&gt;
        &lt;/ng-container&gt;
  
        &lt;!-- Weight Column --&gt;
        &lt;ng-container matColumnDef="weight"&gt;
          &lt;th mat-header-cell *matHeaderCellDef mat-sort-header&gt; Weight &lt;/th&gt;
          &lt;td mat-cell *matCellDef="let element"&gt; {{element.weight}} &lt;/td&gt;
        &lt;/ng-container&gt;
  
        &lt;!-- Symbol Column --&gt;
        &lt;ng-container matColumnDef="symbol"&gt;
          &lt;th mat-header-cell *matHeaderCellDef mat-sort-header&gt; Symbol &lt;/th&gt;
          &lt;td mat-cell *matCellDef="let element"&gt; {{element.symbol}} &lt;/td&gt;
        &lt;/ng-container&gt;
  
        &lt;tr mat-header-row *matHeaderRowDef="displayedColumns"&gt;&lt;/tr&gt;
        &lt;tr mat-row *matRowDef="let row; columns: displayedColumns;"&gt;&lt;/tr&gt;
      &lt;/mat-table&gt;
    &lt;/div&gt;
  &lt;!-- &lt;/mat-dialog-content&gt; --&gt;
  &lt;mat-dialog-actions&gt;
    &lt;button mat-button [mat-dialog-close]="true"&gt;OK&lt;/button&gt;
  &lt;/mat-dialog-actions&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>Here is my Angular Material import module which I import into same module where I declare my <code>HistoryComponent</code>:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>import { NgModule } from "@angular/core";
  
  import {
    MatToolbarModule,
    MatButtonModule,
    MatButtonToggleModule,
    MatIconModule,
    MatCardModule,
    MatOptionModule,
    MatSelectModule,
    MatFormFieldModule,
    MatExpansionModule,
    MatListModule,
    MatCheckboxModule,
    MatSidenavModule,
    MatInputModule,
    MatDatepickerModule,
    MatNativeDateModule,
    MatDialogModule,
    MatTableModule,
    MatSortModule,
  } from "@angular/material";
  
  const materialModules = [
    MatToolbarModule,
    MatButtonModule,
    MatButtonToggleModule,
    MatIconModule,
    MatCardModule,
    MatOptionModule,
    MatSelectModule,
    MatFormFieldModule,
    MatExpansionModule,
    MatListModule,
    MatCheckboxModule,
    MatSidenavModule,
    MatInputModule,
    MatDatepickerModule,
    MatNativeDateModule,
    MatDialogModule,
    MatTableModule,
    MatSortModule,
  ];
  
  @NgModule ({
    imports: [...materialModules],
    exports: [...materialModules],
  })
  export class MaterialModule { }</code></pre>
  </div>
  </div>
  </p>
  
  <p>The <code>HistoryComponent</code> is declared and also added to the entryComponents array.</p>
  
  <p>When I open the modal in the browser, no data is displayed in the table:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;mat-table _ngcontent-c19="" class="mat-table" matsort="" role="grid" ng-reflect-data-source="[object Object],[object Object"&gt;
  &lt;tr _ngcontent-c19="" mat-header-row="" class="ng-star-inserted" style=""&gt;&lt;/tr&gt;
  &lt;tr _ngcontent-c19="" mat-row="" class="ng-star-inserted" style=""&gt;&lt;/tr&gt;
  &lt;tr _ngcontent-c19="" mat-row="" class="ng-star-inserted" style=""&gt;&lt;/tr&gt;
  &lt;tr _ngcontent-c19="" mat-row="" class="ng-star-inserted" style=""&gt;&lt;/tr&gt;
  &lt;tr _ngcontent-c19="" mat-row="" class="ng-star-inserted" style=""&gt;&lt;/tr&gt;
  &lt;tr _ngcontent-c19="" mat-row="" class="ng-star-inserted" style=""&gt;&lt;/tr&gt;
  &lt;tr _ngcontent-c19="" mat-row="" class="ng-star-inserted" style=""&gt;&lt;/tr&gt;
  &lt;tr _ngcontent-c19="" mat-row="" class="ng-star-inserted" style=""&gt;&lt;/tr&gt;
  &lt;tr _ngcontent-c19="" mat-row="" class="ng-star-inserted" style=""&gt;&lt;/tr&gt;
  &lt;tr _ngcontent-c19="" mat-row="" class="ng-star-inserted" style=""&gt;&lt;/tr&gt;
  &lt;tr _ngcontent-c19="" mat-row="" class="ng-star-inserted" style=""&gt;&lt;/tr&gt;
  &lt;tr _ngcontent-c19="" mat-row="" class="ng-star-inserted" style=""&gt;&lt;/tr&gt;
  &lt;tr _ngcontent-c19="" mat-row="" class="ng-star-inserted" style=""&gt;&lt;/tr&gt;
  &lt;tr _ngcontent-c19="" mat-row="" class="ng-star-inserted" style=""&gt;&lt;/tr&gt;
  &lt;tr _ngcontent-c19="" mat-row="" class="ng-star-inserted" style=""&gt;&lt;/tr&gt;
  &lt;tr _ngcontent-c19="" mat-row="" class="ng-star-inserted" style=""&gt;&lt;/tr&gt;
  &lt;tr _ngcontent-c19="" mat-row="" class="ng-star-inserted" style=""&gt;&lt;/tr&gt;
  &lt;tr _ngcontent-c19="" mat-row="" class="ng-star-inserted" style=""&gt;&lt;/tr&gt;
  &lt;tr _ngcontent-c19="" mat-row="" class="ng-star-inserted" style=""&gt;&lt;/tr&gt;
  &lt;tr _ngcontent-c19="" mat-row="" class="ng-star-inserted" style=""&gt;&lt;/tr&gt;
  &lt;tr _ngcontent-c19="" mat-row="" class="ng-star-inserted" style=""&gt;&lt;/tr&gt;&lt;/mat-table&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>What is hapenning here? I am not getting any errors or whatsoever.</p>
  
  <blockquote>
    <p>StackBlitz example here: <a href="https://stackblitz.com/edit/angular-assyye" rel="nofollow noreferrer">https://stackblitz.com/edit/angular-assyye</a> but suddenly it is working there and I have no clue why.</p>
  </blockquote>