Fix undefined canvas element issues in BitPdfReader (#9479) #9480
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WalkthroughThe pull request introduces a modification to the Changes
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Actionable comments posted: 1
🧹 Outside diff range and nitpick comments (2)
src/BlazorUI/Bit.BlazorUI.Extras/Components/PdfReader/BitPdfReader.ts (2)
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82-87: Consider refactoring canvas element retrieval logicThe current approach of trying two different element IDs could be improved for better maintainability and consistency.
Consider these improvements:
- Create a dedicated method for canvas retrieval to centralize the logic
- Document the expected DOM structure and element ID patterns
- Consider using a more explicit naming convention for multi-page scenarios
Example refactor:
private static getCanvasElement(config: BitPdfReaderConfig, pageNumber: number): HTMLCanvasElement | null { // Try single-canvas mode let canvas = document.getElementById(config.id) as HTMLCanvasElement; if (canvas) return canvas; // Try multi-page mode canvas = document.getElementById(`${config.id}-${pageNumber}`) as HTMLCanvasElement; return canvas; }This would make the canvas retrieval logic more maintainable and easier to modify if the DOM structure changes.
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89-121: Improve error handling and status reporting in renderPage methodThe current error handling is minimal and doesn't provide feedback about failures.
Consider enhancing error handling:
- public static async renderPage(id: string, pageNumber: number) { + public static async renderPage(id: string, pageNumber: number): Promise<boolean> { const config = BitPdfReader._bitPdfReaders.get(id); - if (!config || !config.pdfDoc) return; + if (!config || !config.pdfDoc) { + console.warn(`BitPdfReader: Invalid configuration or PDF document for ID ${id}`); + return false; + } - if (config.isRendering[pageNumber]) return; - if (pageNumber < 1 || pageNumber > config.pdfDoc.numPages) return; + if (config.isRendering[pageNumber]) { + console.warn(`BitPdfReader: Page ${pageNumber} is already rendering`); + return false; + } + if (pageNumber < 1 || pageNumber > config.pdfDoc.numPages) { + console.error(`BitPdfReader: Invalid page number ${pageNumber}`); + return false; + } config.isRendering[pageNumber] = true; try { // ... existing rendering code ... + return true; + } catch (error) { + console.error(`BitPdfReader: Failed to render page ${pageNumber}:`, error); + return false; } finally { config.isRendering[pageNumber] = false; } }This would:
- Provide meaningful error messages
- Return rendering status to the caller
- Help with debugging by logging specific failure points
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📒 Files selected for processing (1)
src/BlazorUI/Bit.BlazorUI.Extras/Components/PdfReader/BitPdfReader.ts(1 hunks)
🔇 Additional comments (1)
src/BlazorUI/Bit.BlazorUI.Extras/Components/PdfReader/BitPdfReader.ts (1)
98-99: Verify canvas handling across different usage patterns
While the fix addresses the immediate issue, let's verify it works across different scenarios.
This will help ensure the fix works with all existing usage patterns in the codebase.
✅ Verification successful
Canvas null check is properly implemented and safe
The code implements a robust canvas handling pattern:
- First attempts to get canvas by primary ID
- Falls back to page-specific canvas ID if primary fails
- Safely returns if no canvas is found
- Subsequent canvas operations are protected by this null check
The implementation is correct and follows defensive programming practices, ensuring no operations are attempted on undefined canvas elements.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Search for different canvas usage patterns in the codebase
echo "Checking canvas element usage patterns..."
rg -l "getElementById.*canvas" --type ts
# Look for potential test files
echo "Checking for related test files..."
fd -e test.ts -e spec.ts "BitPdfReader"
# Check for related component usage
echo "Checking component usage..."
rg "BitPdfReader" --type razor
Length of output: 380
Script:
#!/bin/bash
# Let's try a broader search for canvas-related code and component usage
echo "Checking canvas element usage patterns..."
rg "getElementById.*canvas|getContext.*canvas" --type typescript
echo "Checking BitPdfReader component usage..."
rg "BitPdfReader"
# Look for the component definition
echo "Checking component definition..."
fd "BitPdfReader"
Length of output: 10283
Script:
#!/bin/bash
# Let's check the specific canvas handling in the TypeScript file
echo "Checking canvas handling in BitPdfReader.ts..."
rg -A 5 -B 5 "canvas" src/BlazorUI/Bit.BlazorUI.Extras/Components/PdfReader/BitPdfReader.ts
# Check for any error handling patterns around canvas
echo "Checking error handling patterns..."
rg "if.*(!|null|undefined).*canvas" src/BlazorUI/Bit.BlazorUI.Extras/Components/PdfReader/BitPdfReader.ts
Length of output: 1515
closes #9479
Summary by CodeRabbit