How do you calculate the div bg color from blue to lightblue to gray based on a percentage value? ex. if the value equals 100%, the div's bg color is #0000FF
; if the value equals 50%, it's light blue; if the value equals 0, the bg color is gray.
Does there have a algorithm work on this?
Thanks for any help.
First, you'll want the hexadecimal value in RGB. For that, you can use this function:
function hexToRgb(hex) {
return {
r: parseInt(hex.substring(1, 3), 16),
g: parseInt(hex.substring(3, 5), 16),
b: parseInt(hex.substring(5, 7), 16)
};
}
Then, just apply the weights to each component:
function blendColors(colorA, colorB, weight) {
return {
r: Math.floor(colorA.r * (1 - weight) + colorB.r * weight),
g: Math.floor(colorA.g * (1 - weight) + colorB.g * weight),
b: Math.floor(colorA.b * (1 - weight) + colorB.b * weight)
};
}
You can make a json object and directly refer to it while changing the color
var colorMap = new Object();
colorMap["100%"] = "#0000FF";
colorMap["50%"] = "lightBlue";
colorMap["0%"] = "gray";
and then use this map whenevr you change the background color
var percentageValue = '100%'; //you can pass this value inside a function also
document.getElementById("obj").style.background-color=colorMap[percentageValue];
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