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Javascript color display


Javascript color display

By : Will Zhang
Date : November 22 2020, 10:48 AM
this one helps. I'm trying to create an HTML file from a js file using node.js! My question is why do the colors not display in the html file. I created the string for the hex values, but in the html file the colors are not shown. , You're missing the CSS key,
change this
code :
format="<li style =\""+color+"\">"+color+"</li>";
format = "<li style =\"color : " + color + "\">" + color + "</li>";
<li style="#ffffff">#ffffff</li>


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Why does TPanel's color property display the wrong color when using a hex color value?

Why does TPanel's color property display the wrong color when using a hex color value?


By : user3607244
Date : March 29 2020, 07:55 AM
I hope this helps . I am using Delphi 2010 and if I create a new VCL application, drop a TPanel on the form and set its "color" property to "clInactiveCaptionText" it shows the correct color. , RGB color values are actually specified as BGR.
So if you want:
JavaScript not changing display type or color in IE

JavaScript not changing display type or color in IE


By : user3807008
Date : March 29 2020, 07:55 AM
Hope that helps IE unfortunately does not support document.getElementsByClassName.
Add your own support
code :
document.getElementsByClassName = function(class_name) {
    var docList = this.all || this.getElementsByTagName('*');
    var matchArray = new Array();
    var re = new RegExp("(?:^|\\s)"+class_name+"(?:\\s|$)");
    for (var i = 0; i < docList.length; i++) {
        if (re.test(docList[i].className) ) {
            matchArray[matchArray.length] = docList[i];
        }
    }
    return matchArray;
}
function switchCat(cat) {
    $(".lower-ul").css({
        display:"none"
    });
    $(".lower-cat-title").css({
        color:"white"
    });
    if (cat != -1) {
        $("lower-cat-"+cat).css({
            display:"block"
        });
        $("lower-cat-title-"+cat).css({
            color:"yellow"
        });
    }
}
Colorize or replace the color of a textured image by a specified color using javascript and HTML5 canvas.Like color blen

Colorize or replace the color of a textured image by a specified color using javascript and HTML5 canvas.Like color blen


By : Justin
Date : March 29 2020, 07:55 AM
wish helps you Here's an interactive solution. Run it from localhost and specify a valid image.
code :
<!DOCTYPE html>
<html>
<head>
<script>
function byId(e){return document.getElementById(e);}
function newEl(tag){return document.createElement(tag);}
function newTxt(txt){return document.createTextNode(txt);}

window.addEventListener('load', mInit, false);

function mInit()
{
    var srcImg = byId('srcImg');

    byId('hueSlider').style.width = srcImg.width + "px";
    var destImg = byId('dstImg');
    destImg.width = srcImg.width;
    destImg.height = srcImg.height;
}

function colorize()
{
    var curHue = byId('hueSlider').value;
    var curSat = byId('satSlider').value;// / 100.0;
    var curLum = byId('lumSlider').value / 100.0;
    byId('hueVal').innerHTML = curHue;
    byId('satVal').innerHTML = curSat;
    byId('lumVal').innerHTML = curLum;

    var dst = byId('dstImg');
    var dstCtx = dst.getContext('2d');
    var img = byId('srcImg');
    dstCtx.drawImage(img, 0, 0);

    var dstImgData = dstCtx.getImageData(0,0,dst.width,dst.height);
    var i, j, r,g,b,hsl,rgb, index;
    if (byId('colCheckBox').checked)
    {
        console.log('colourizing');
        for (j=0; j<dst.height; j++)
        {
            for (i=0; i<dst.width; i++)
            {
                index = (i + j*dst.width) * 4;              // 4 bytes/pixel, set index to point to r component of x,y in dst image
                r = dstImgData.data[index+0];
                g = dstImgData.data[index+1];
                b = dstImgData.data[index+2];
                hsl = rgb2hsl (r, g, b);

                hsl.h = curHue;
                //if (hsl.h > 359)
                //  hsl.h -= 360;
                hsl.s = curSat;

                hsl.l *= curLum;

                rgb = hsl2rgb(hsl.h, hsl.s, hsl.l);
                dstImgData.data[index+0] = rgb.r;
                dstImgData.data[index+1] = rgb.g;
                dstImgData.data[index+2] = rgb.b;
            }
        }
        dstCtx.putImageData(dstImgData,0,0);
    }
}

// code taken from nichabi.com
function hsl2rgb (h, s, l) {

    var r, g, b, m, c, x

    if (!isFinite(h)) h = 0
    if (!isFinite(s)) s = 0
    if (!isFinite(l)) l = 0

    h /= 60
    if (h < 0) h = 6 - (-h % 6)
    h %= 6

    s = Math.max(0, Math.min(1, s / 100))
    l = Math.max(0, Math.min(1, l / 100))

    c = (1 - Math.abs((2 * l) - 1)) * s
    x = c * (1 - Math.abs((h % 2) - 1))

    if (h < 1) {
        r = c
        g = x
        b = 0
    } else if (h < 2) {
        r = x
        g = c
        b = 0
    } else if (h < 3) {
        r = 0
        g = c
        b = x
    } else if (h < 4) {
        r = 0
        g = x
        b = c
    } else if (h < 5) {
        r = x
        g = 0
        b = c
    } else {
        r = c
        g = 0
        b = x
    }

    m = l - c / 2
    r = Math.round((r + m) * 255)
    g = Math.round((g + m) * 255)
    b = Math.round((b + m) * 255)

    return { r: r, g: g, b: b }
}


// code taken from nichabi.com
function rgb2hsl (r, g, b) 
{
    var max, min, h, s, l, d
    r /= 255
    g /= 255
    b /= 255
    max = Math.max(r, g, b)
    min = Math.min(r, g, b)
    l = (max + min) / 2
    if (max == min) {
        h = s = 0
    } else {
        d = max - min
        s = l > 0.5 ? d / (2 - max - min) : d / (max + min)
        switch (max) {
            case r:
                h = (g - b) / d + (g < b ? 6 : 0)
                break
            case g:
                h = (b - r) / d + 2
                break
            case b:
                h = (r - g) / d + 4
                break
        }
        h /= 6
    }
    h = Math.floor(h * 360)
    s = Math.floor(s * 100)
    l = Math.floor(l * 100)
    return { h: h, s: s, l: l }
}


</script>
<style>
body
{
    background: #888;
}
#hueVal, #satVal, #lumVal
{
    font-size: 0.8em;
    font-weight: bold;
    display: inline;
}
</style>
</head>
<body>
<img id='srcImg' src='handlebars.png'/><canvas id='dstImg'></canvas>
<br>
<label><input type='checkbox' id='colCheckBox' onchange='colorize()' />Colourize</label>
<br>
Hue<input id='hueSlider' onchange='colorize()' type='range' min='0' max='359'/><div id='hueVal'></div><br>
Saturation<input id='satSlider' onchange='colorize()' type='range' value='50' min='0' max='100'/><div id='satVal'></div><br>
Luminance<input id='lumSlider' onchange='colorize()' type='range' min='0' max='200'/><div id='lumVal'></div>
</body>
</html>
How to change the color of one variable to another color with a predefined color palette with javascript

How to change the color of one variable to another color with a predefined color palette with javascript


By : John Suslin
Date : March 29 2020, 07:55 AM
Does that help What you could do if you want to keep the change in your DB:
on select of a new color by the user, update the entity in your DB with $.post() method : https://api.jquery.com/jquery.post/
code :
$.post( url, { entityId: entityId, color: newColor }, function(){

    $('#yourElement').css('color', newColor);
} );
How to display color picker on button click, and on select of particular color i want to get a hex code of that color?

How to display color picker on button click, and on select of particular color i want to get a hex code of that color?


By : user2917618
Date : March 29 2020, 07:55 AM
this one helps. which is the best cocoapod of color pickets for ios application? , try below code:
code :
let str = yourSelectedColorVariable.hexStringFromColor
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