Angular material table with expandable action button at each row

Question

We are trying to achieve table design POC as given in following image which is having following features.

Issue is with following functionality

1) Expand and collapse behavior should be per row(Not for all rows at a time).
2) It should have value of particular row on click of any action from action-toolbar(i.e. Config, History, etc in image).

HTML

<ng-container matColumnDef="symbol">
<th mat-header-cell *matHeaderCellDef mat-sort-header> Symbol </th>
<td mat-cell *matCellDef="let element">
  <div [ngClass]="showFloatingButtons == true ? 'floating-pane-active' : 'floating-pane-deactive'"
    class="button-row">
    <mat-icon mat-fab *ngIf="showFloatingButtons == true" color="primary" class="floating-buttons">offline_pin
    </mat-icon>
    <mat-icon mat-fab *ngIf="showFloatingButtons == true" color="primary" class="floating-buttons">query_builder
    </mat-icon>
    <mat-icon mat-fab *ngIf="showFloatingButtons == true" color="primary" class="floating-buttons" disabled>restore
    </mat-icon>
    <mat-icon mat-fab *ngIf="showFloatingButtons == true" color="primary" class="floating-buttons">
      play_circle_filled</mat-icon>
    <mat-icon (click)="toggleFloat()" class="sky_blue">more_horiz</mat-icon>
  </div>
</td>

CSS

table {
  width: 100%;
}

.mat-form-field {
  font-size: 14px;
  width: 50%;
}

.mat-column-position {
  max-width: 100px;
  min-width: 10px;
}

.mat-column-name {
  max-width: 100px;
  min-width: 10px;
}

.example-trigger {
  display: inline-block;
}

.floating-buttons {
  z-index: 2;
  // position: fixed;
  overflow: auto;
  top: auto;
  left: auto;
}

.floating-pane-active {
  background-color: rgba(215, 228, 230, 0.39);
  border-top-left-radius: 25px;
  border-bottom-left-radius: 25px;
  background-position: right;
  background-repeat: repeat;
}

.floating-pane-deactive {
  background-color: rgba(215, 228, 230, 0.39);
  border-top-left-radius: 25px;
  border-bottom-left-radius: 25px;
  background-position: right;
  background-repeat: repeat;
  width: 30px;
}

.button-row {
  align-items: center;
  justify-content: space-around;
}

.action-buttons {
  width: 20px;
}

.sky_blue {
  color: skyblue;
}

.mat-column-symbol {
  word-wrap: break-word !important;
  white-space: unset !important;
  flex: 0 0 10% !important;
  width: 10% !important;
  overflow-wrap: break-word;
  word-wrap: break-word;

  word-break: break-word;

  -ms-hyphens: auto;
  -moz-hyphens: auto;
  -webkit-hyphens: auto;
  hyphens: auto;
  text-align: right;
}

TS(putting only important line)

showFloatingButtons = false;

Collapsed column icons

Expanded column icons

FYI: I've refered this link for expandable row table.

Please find demo code here on stackblitz for more.

PS: Main problem here is to achieve expanding single row icons at a time.

Answer 1

Your first problem is simple, you are using the same variable to show/hide elements, so it's a natural behavior that they appear/disappear together. You have to create a table where you store the state of each row (expanded or not), for this I created this table and initialized it in ngOnInit:

expanded = [];
for(var i: number = 0; i < ELEMENT_DATA.length; i++) {
    this.expanded[i] = false;
}

Then I changed your toggleFunction to change the value of that tables column instead:

toggleFloat(i:number) {
    this.expanded[i] = !this.expanded[i];
}

And in the HTML i changed the *ngIf conditions to use the new table instead of the old variable:

  <ng-container matColumnDef="symbol">
    <th mat-header-cell *matHeaderCellDef mat-sort-header> Symbol </th>
    <td mat-cell *matCellDef="let element; let i = index">
      <div [ngClass]="expanded[i] == true ? 'floating-pane-active' : 'floating-pane-deactive'"
        class="button-row">
        <mat-icon mat-fab *ngIf="expanded[i] == true" color="primary" class="floating-buttons">offline_pin
        </mat-icon>
        <mat-icon mat-fab *ngIf="expanded[i] == true" color="primary" class="floating-buttons">query_builder
        </mat-icon>
        <mat-icon mat-fab *ngIf="expanded[i] == true" color="primary" class="floating-buttons" disabled>restore
        </mat-icon>
        <mat-icon mat-fab *ngIf="expanded[i] == true" color="primary" class="floating-buttons">
          play_circle_filled</mat-icon>
        <mat-icon (click)="toggleFloat(i)" class="sky_blue">more_horiz</mat-icon>
      </div>
    </td>
  </ng-container>

Here is the stackblitz, solves your first problem, I didnt really understand what's your second problem though.