Is there a way to dynamically change row colors based on the date order in a table?
In my mat table, I have a date field and I'm looking to highlight rows with the closest date in red and gradually transition to green for the furthest dates.
Is there a way to dynamically change row colors based on the date order in a table?
In my mat table, I have a date field and I'm looking to highlight rows with the closest date in red and gradually transition to green for the furthest dates.
Within this Stack Overflow thread, you can find a method for blending two colors together. If you create a function like this:
blendColors(colorA:string, colorB:string, amount:number) {
const [rA, gA, bA] = (colorA.match(/\w\w/g) || []).map((c) => parseInt(c, 16));
const [rB, gB, bB] = (colorB.match(/\w\w/g) || []).map((c) => parseInt(c, 16));
const r = Math.round(rA + (rB - rA) * amount).toString(16).padStart(2, '0');
const g = Math.round(gA + (gB - gA) * amount).toString(16).padStart(2, '0');
const b = Math.round(bA + (bB - bA) * amount).toString(16).padStart(2, '0');
return '#' + r + g + b;
}
You can apply the function to set the background color of HTML elements like so:
<tr mat-row
[style.background-color]="blendColors('#FF0000','#00FF00',i/dataSource.length)"
*matRowDef="let row; let i=index; columns: displayedColumns;">
</tr>
This will result in a gradient effect from red to green going downwards on each row. To customize the color transition further, consider adjusting the formula within the blendColors function by changing the value passed in place of i/dataSource.length.
For a practical demonstration, check out the code on StackBlitz.
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