RGB Slider
The RGB slider implements three slider controls to generate a
RGB color. The background color of each slider is also
dynamically modified to reflect the colors that could be
generated by moving a single slider.
The logger is paused for performance reasons. Click "Resume" to re-enable it.
RGB
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Hex: #
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var r, g, b;
var dd;
function init() {
rgbInit();
}
function rgbInit() {
r = YAHOO.widget.Slider.getHorizSlider("rBG", "rthumb", 0, 128);
r.onChange = function(newVal) { listenerUpdate("r", newVal*2); };
g = YAHOO.widget.Slider.getHorizSlider("gBG", "gthumb", 0, 128);
g.onChange = function(newVal) { listenerUpdate("g", newVal*2); };
b = YAHOO.widget.Slider.getHorizSlider("bBG", "bthumb", 0, 128);
b.onChange = function(newVal) { listenerUpdate("b", newVal*2); };
initColor();
dd = new YAHOO.util.DD("ddRGB");
dd.setHandleElId("pickerHandle");
}
window.onload = init;
function initColor() {
var ch = " ";
d = document.createElement("P");
d.className = "rb";
r.getEl().appendChild(d);
d = document.createElement("P");
d.className = "rb";
g.getEl().appendChild(d);
d = document.createElement("P");
d.className = "rb";
b.getEl().appendChild(d);
for (var i=0; i<34; i++) {
d = document.createElement("SPAN");
d.id = "rBG" + i
// d.innerHTML = ch;
r.getEl().appendChild(d);
d = document.createElement("SPAN");
d.id = "gBG" + i
// d.innerHTML = ch;
g.getEl().appendChild(d);
d = document.createElement("SPAN");
d.id = "bBG" + i
// d.innerHTML = ch;
b.getEl().appendChild(d);
}
d = document.createElement("P");
d.className = "lb";
r.getEl().appendChild(d);
d = document.createElement("P");
d.className = "lb";
g.getEl().appendChild(d);
d = document.createElement("P");
d.className = "lb";
b.getEl().appendChild(d);
userUpdate();
}
function updateSliderColors() {
var curr, curg, curb;
curr = Math.min(r.getValue() * 2, 255);
curg = Math.min(g.getValue() * 2, 255);
curb = Math.min(b.getValue() * 2, 255);
YAHOO.log("updateSliderColor " + curr + ", " + curg + ", " + curb);
var d;
for (var i=0; i<34; i++) {
d = document.getElementById("rBG" + i);
d.style.backgroundColor =
"rgb(" + (i*8) + "," + curg + "," + curb + ")";
d = document.getElementById("gBG" + i);
d.style.backgroundColor =
"rgb(" + curr + "," + (i*8) + "," + curb + ")";
d = document.getElementById("bBG" + i);
d.style.backgroundColor =
"rgb(" + curr + "," + curg + "," + (i*8) + ")";
}
document.getElementById("swatch").style.backgroundColor =
"rgb(" + curr + "," + curg + "," + curb + ")";
document.getElementById("hexval").value =
YAHOO.util.Color.rgb2hex(curr, curg, curb);
}
function listenerUpdate(whichSlider, newVal) {
if (newVal == 256) {
newVal = 255;
}
document.getElementById(whichSlider + "val").value = newVal;
updateSliderColors();
}
function userUpdate(isHex) {
var v;
var f = document.forms['rgbform'];
if (isHex) {
var hexval = f["hexval"].value;
// shorthand #369
if (hexval.length == 3) {
var newval = "";
for (var i=0;i<3;i++) {
var a = hexval.substr(i, 1);
newval += a + a;
}
hexval = newval;
}
YAHOO.log("hexval:" + hexval);
if (hexval.length != 6) {
alert("illegal hex code: " + hexval);
} else {
var rgb = YAHOO.util.Color.hex2rgb(hexval);
// alert(rgb.toString());
if (YAHOO.util.Color.isValidRGB(rgb)) {
f['rval'].value = rgb[0];
f['gval'].value = rgb[1];
f['bval'].value = rgb[2];
}
}
}
// red
v = parseFloat(f['rval'].value);
v = ( isNaN(v) ) ? 0 : Math.round(v);
YAHOO.log("setValue, r: " + v);
r.setValue(Math.round(v) / 2);
v = parseFloat(f['gval'].value);
v = ( isNaN(v) ) ? 0 : Math.round(v);
YAHOO.log("setValue, g: " + g);
g.setValue(Math.round(v) / 2);
v = parseFloat(f['bval'].value);
v = ( isNaN(v) ) ? 0 : Math.round(v);
YAHOO.log("setValue, b: " + b);
b.setValue(Math.round(v) / 2);
updateSliderColors();
return false;
}
function userReset() {
var v;
var f = document.forms['rgbform'];
r.setValue(0);
g.setValue(0);
b.setValue(0);
}