🤖
AI Answer
## Step-by-Step Solution
### 1. Set Up Your Angular Standalone Component
- Create a new Angular standalone component using the Angular CLI:
```bash
ng generate component diagram --standalone
```
### 2. Import FormsModule
- In your component file (e.g., `diagram.component.ts`), import `FormsModule`:
```typescript
import { FormsModule } from '@angular/forms';
import { Component } from '@angular/core';
```
- Add `FormsModule` to the `imports` array of your component's decorator:
```typescript
@Component({
selector: 'app-diagram',
standalone: true,
templateUrl: './diagram.component.html',
styleUrls: ['./diagram.component.css'],
imports: [FormsModule]
})
export class DiagramComponent {
// Component logic will go here
}
```
### 3. Create the Template
- In `diagram.component.html`, set up a textarea for user input and a div for the rendered diagram:
```html
<textarea [(ngModel)]="mermaidCode" (ngModelChange)="renderDiagram()"></textarea>
<div #diagramContainer></div>
```
### 4. Implement Component Logic
- In `diagram.component.ts`, define properties and methods:
```typescript
import { Component, ViewChild, ElementRef, AfterViewInit } from '@angular/core';
import mermaid from 'mermaid';
import svgPanZoom from 'svg-pan-zoom';
@Component({
// ...
})
export class DiagramComponent implements AfterViewInit {
mermaidCode: string = ''; // This will hold user input
@ViewChild('diagramContainer') diagramContainer!: ElementRef;
ngAfterViewInit() {
this.renderDiagram(); // Initial rendering
}
renderDiagram() {
try {
mermaid.render('diagram', this.mermaidCode, (svgCode) => {
this.diagramContainer.nativeElement.innerHTML = svgCode;
svgPanZoom(this.diagramContainer.nativeElement.querySelector('svg'), {
zoomEnabled: true,
controlIconsEnabled: true,
panEnabled: true,
});
});
} catch (error) {
console.error('Error rendering diagram:', error);
}
}
}
```
### 5. Handle Type Errors
- Ensure that the `mermaid` and `svg-pan-zoom` libraries are correctly installed:
```bash
npm install mermaid svg-pan-zoom
```
- Add type definitions for Mermaid.js if necessary:
```bash
npm install --save-dev @types/mermaid
```
### 6. Optimize Code for Performance
- Avoid unnecessary render calls by debouncing user input or using Angular’s change detection strategies. Consider using `ngZone` if rendering becomes heavy.
### 7. Testing and Validation
- Ensure that the component is tested with various Mermaid.js inputs and that the SVG pan and zoom functionalities work as expected.
### Conclusion
This Angular component allows for dynamic diagram rendering using Mermaid.js, providing a smooth user experience with zooming and panning capabilities. Make sure to handle errors gracefully and maintain good coding practices.