On my website, there is a variable called 'x' which represents a percentage. I am looking for a way to assign colors based on this percentage - with 0% being red and 100% being blue. For example, if 'x' is 50%, the color should be a mix of red and blue. If 'x' is 70%, the red intensity should be higher in the color combination, and so on for any other percentage 'x' may provide.
The hexadecimal code for red is ff0000 (decimal code is 16711680), and for blue it is 0000ff (decimal code is 255). To convert from hex to decimal, you can use the parseInt(hexcode, 16) function. The algorithm to calculate the percentage is: maximum value 16711680 is 100%; minimum value 255 is 0%. Therefore, the x% will be 255 + (16711680 - 255) * x / 100. This result can then be converted to hex using the toString(16) function. Here is an example:
$('#control').change(function(e){
var vl = $(this).val();
var min = 255; //blue color -> 0000ff
var max = 16711680; //red color -> ff0000
var current = 255 + Math.round(vl*(max-min)/100);
var hex = current.toString(16);
var currentHex = '#'+'0'.repeat(6-hex.length)+hex;
$('#colorcode').html(currentHex);
$('#box').css('backgroundColor', currentHex);
});<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type='range' value='0' min='0' max='100' id='control' style='width:200px;'>
<div id='colorcode'>Color code</div>
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