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Refactor handleKeydown Method for Improved Readability and Maintainability #804

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Refactor handleKeydown Method for Improved Readability and Maintainability #804

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a4188c8
refactor the handlekeydown code
shivam-daksh Oct 20, 2024
1bb1471
lint fix by commenting the unused code
shivam-daksh Oct 21, 2024
75f07a2
row highlight fix when tab key pressed
shivam-daksh Oct 23, 2024
6163a15
Fix the infinite loop of Tab key over table cells
shivam-daksh Oct 25, 2024
c518276
adding the lost comments during refactoring
shivam-daksh Oct 27, 2024
f41e333
Merge branch 'learningequality:develop' into refactor-handlekeydown
shivam-daksh Nov 15, 2024
b6f712e
fixing the tab and shift+tab key functionality
shivam-daksh Nov 16, 2024
0708628
highlight rows and columns
shivam-daksh Nov 17, 2024
fff71d4
tab and shift+tab working but first cell of table not getting focused
shivam-daksh Nov 17, 2024
4b61140
Merge branch 'refactor-handlekeydown' of https://github.com/shivam-da…
shivam-daksh Nov 17, 2024
59e33b9
sort the columns only from header row
shivam-daksh Nov 20, 2024
0f5bd96
utilize updateFocusState function in arrow keys handling
shivam-daksh Nov 20, 2024
354df74
change parameter name of updateFocusState function
shivam-daksh Nov 20, 2024
021bf28
modify the shift+tab conditions
shivam-daksh Nov 20, 2024
c153871
replace ternary if-else for readability
shivam-daksh Nov 23, 2024
e84bb62
change tab behavior comment
shivam-daksh Nov 23, 2024
ed52699
remove redundant code from tab functionality
shivam-daksh Nov 23, 2024
15d86e5
Merge remote-tracking branch 'origin/develop' into refactor-handlekey…
shivam-daksh Dec 5, 2024
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212 changes: 113 additions & 99 deletions lib/KTable/index.vue
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Original file line number Diff line number Diff line change
Expand Up @@ -331,156 +331,170 @@
* - header highlight
*/
handleKeydown(event, rowIndex, colIndex) {
const key = event.key;
switch (event.key) {
case 'ArrowUp':
case 'ArrowDown':
case 'ArrowLeft':
case 'ArrowRight':
this.handleArrowKeys(event.key, rowIndex, colIndex);
break;
case 'Enter':
this.handleEnterKey(rowIndex, colIndex);
break;
case 'Tab':
this.handleTabKey(event, rowIndex, colIndex);
break;
default:
break;
}
},

handleArrowKeys(key, rowIndex, colIndex) {
const totalRows = this.rows.length;
const totalCols = this.headers.length;

const lastRowIndex = totalRows - 1;
const lastColIndex = totalCols - 1;
let nextRowIndex = rowIndex;
let nextColIndex = colIndex;

switch (key) {
case 'ArrowUp':
if (rowIndex === -1) {
nextRowIndex = totalRows - 1;
nextRowIndex = lastRowIndex;
} else {
nextRowIndex = rowIndex - 1;
}
break;
case 'ArrowDown':
if (rowIndex === -1) {
nextRowIndex = 0;
} else if (rowIndex === totalRows - 1) {
} else if (rowIndex === lastRowIndex) {
nextRowIndex = -1;
} else {
nextRowIndex = (rowIndex + 1) % totalRows;
nextRowIndex = rowIndex + 1;
}
break;
case 'ArrowLeft':
if (rowIndex === -1) {
if (colIndex > 0) {
nextColIndex = colIndex - 1;
} else {
nextColIndex = totalCols - 1;
nextRowIndex = totalRows - 1;
nextColIndex = lastColIndex;
}
if (colIndex === 0) {
nextRowIndex = lastRowIndex;
} else {
nextRowIndex = -1;
}
} else if (colIndex > 0) {
nextColIndex = colIndex - 1;
} else {
nextColIndex = totalCols - 1;
nextRowIndex = rowIndex > 0 ? rowIndex - 1 : -1;
if (colIndex > 0) {
nextColIndex = colIndex - 1;
} else {
nextColIndex = lastColIndex;
}
if (colIndex === 0) {
if (rowIndex > 0) {
nextRowIndex = rowIndex - 1;
} else {
nextRowIndex = -1;
}
} else {
nextRowIndex = rowIndex;
}
}
break;
case 'ArrowRight':
if (colIndex === totalCols - 1) {
if (rowIndex === totalRows - 1) {
nextColIndex = 0;
if (colIndex === lastColIndex) {
nextColIndex = 0;
if (rowIndex === lastRowIndex) {
nextRowIndex = -1;
} else {
nextColIndex = 0;
nextRowIndex = rowIndex + 1;
}
} else {
nextColIndex = colIndex + 1;
}
break;
case 'Enter':
if (rowIndex === -1 && this.sortable) {
this.handleSort(colIndex);
}
break;
case 'Tab': {
// Identify all focusable elements inside the current cell
const currentCell = this.getCell(rowIndex, colIndex);
}
this.updateFocusState(nextRowIndex, nextColIndex);
event.preventDefault();
},

// Collect focusable elements using native DOM methods
const focusableElements = [];
handleEnterKey(rowIndex, colIndex) {
if (rowIndex === -1 && this.sortable) {
this.handleSort(colIndex);
}
},

handleTabKey(event, rowIndex, colIndex) {
const totalRows = this.rows.length;
const totalCols = this.headers.length;
let nextRowIndex = rowIndex;
let nextColIndex = colIndex;

if (currentCell) {
const buttons = currentCell.getElementsByTagName('button');
const links = currentCell.getElementsByTagName('a');
const inputs = currentCell.getElementsByTagName('input');
const selects = currentCell.getElementsByTagName('select');
const textareas = currentCell.getElementsByTagName('textarea');
const currentCell = this.getCell(rowIndex, colIndex);
const focusableElements = this.getFocusableElements(currentCell);
const focusedElement = document.activeElement;

focusableElements.push(...buttons, ...links, ...inputs, ...selects, ...textareas);
}
// Include the cell itself as the first focusable element
const cellAndFocusableElements = [currentCell, ...focusableElements];
const focusedIndex = cellAndFocusableElements.indexOf(focusedElement);

const focusedElementIndex = focusableElements.indexOf(document.activeElement);
if (focusableElements.length > 0) {
if (!event.shiftKey) {
// if navigating between more focusable elements within the cell
if (focusedElementIndex < focusableElements.length - 1) {
focusableElements[focusedElementIndex + 1].focus();
event.preventDefault();
return;
} else {
if (colIndex < totalCols - 1) {
nextColIndex = colIndex + 1;
} else if (rowIndex < totalRows - 1) {
nextColIndex = 0;
nextRowIndex = rowIndex + 1;
} else {
// Allow default behavior when reaching the last cell
return;
}
}
} else {
if (focusedElementIndex < focusableElements.length - 1) {
// if navigating between more focusable elements within the cell
focusableElements[focusedElementIndex + 1].focus();
event.preventDefault();
return;
} else {
if (colIndex > 0) {
nextColIndex = colIndex - 1;
} else if (rowIndex > 0) {
nextColIndex = totalCols - 1;
nextRowIndex = rowIndex - 1;
} else {
// Allow default behavior when reaching the first cell
return;
}
}
}
if (!event.shiftKey) {
// Tab key navigation
if (focusedIndex < cellAndFocusableElements.length - 1) {
// Move to the next focusable element within the cell
cellAndFocusableElements[focusedIndex + 1].focus();
event.preventDefault();
return;
} else {
// Move to the next cell
if (colIndex < totalCols - 1) {
nextColIndex = colIndex + 1;
} else if (rowIndex < totalRows - 1) {
nextColIndex = 0;
nextRowIndex = rowIndex + 1;
} else {
if (!event.shiftKey) {
if (colIndex < totalCols - 1) {
nextColIndex = colIndex + 1;
} else if (rowIndex < totalRows - 1) {
nextColIndex = 0;
nextRowIndex = rowIndex + 1;
} else {
// Allow default behavior when reaching the last cell
return;
}
} else {
if (colIndex > 0) {
nextColIndex = colIndex - 1;
} else if (rowIndex > 0) {
nextColIndex = totalCols - 1;
nextRowIndex = rowIndex - 1;
} else {
// Allow default behavior when reaching the first cell
return;
}
}
return; // Allow default Tab behavior when reaching the end
}

break;
this.updateFocusState(nextRowIndex, nextColIndex);
event.preventDefault();
}

default:
} else {
// Shift+Tab key navigation
if (focusedIndex < cellAndFocusableElements.length - 1) {
// Move to the previous focusable element within the cell
cellAndFocusableElements[focusedIndex + 1].focus();
event.preventDefault();
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return;
} else {
// Move to the last focusable element of the previous cell
if (colIndex > 0) {
nextColIndex = colIndex - 1;
} else if (rowIndex > 0) {
nextColIndex = totalCols - 1;
nextRowIndex = rowIndex - 1;
} else {
return; // Allow default Shift+Tab behavior when at the beginning
}
this.updateFocusState(nextRowIndex, nextColIndex);
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event.preventDefault();
}
}

this.focusCell(nextRowIndex, nextColIndex);
},
updateFocusState(nextRowIndex, nextColIndex) {
this.focusedRowIndex = nextRowIndex === -1 ? null : nextRowIndex;
this.focusedColIndex = nextColIndex;

this.highlightHeader(nextColIndex);
this.focusCell(nextRowIndex, nextColIndex);
},
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event.preventDefault();
getFocusableElements(cell) {
if (!cell) return [];
const selectors = 'button, a, input, select, textarea';
return Array.from(cell.querySelectorAll(selectors));
},

getCell(rowIndex, colIndex) {
if (rowIndex === -1) {
return this.$refs[`header-${colIndex}`][0];
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