我已经为问题准备了a complete example-
具有div和3个jQuery UI滑块的屏幕截图:
HTML代码:
<div id="myCanvas"></div>
<p>Select background color:
<span id="swatch"></span>
<div id="red"></div>
<div id="green"></div>
<div id="blue"></div>
</p>
CSS代码:
#myCanvas {
background: radial-gradient(#FFFFFF, #99CC99);
width: 300px;
height: 60px;
}
#red,
#green,
#blue {
width: 300px;
margin: 15px;
}
#swatch {
padding: 10px;
margin: 5px;
color: #FFF;
}
#red .ui-slider-range {
background: #ef2929;
}
#red .ui-slider-handle {
border-color: #ef2929;
}
#green .ui-slider-range {
background: #8ae234;
}
#green .ui-slider-handle {
border-color: #8ae234;
}
#blue .ui-slider-range {
background: #729fcf;
}
#blue .ui-slider-handle {
border-color: #729fcf;
}
JavaScript代码:
jQuery(document).ready(function($) {
$('#selectable').selectable();
$('#kukuSlider').slider();
function hexFromRGB(r, g, b) {
var hex = [
r.toString(16),
g.toString(16),
b.toString(16)
];
$.each(hex, function(nr, val) {
if (val.length === 1) {
hex[nr] = '0' + val;
}
});
return hex.join('').toUpperCase();
}
function refreshSwatch() {
var red = $('#red').slider('value'),
green = $('#green').slider('value'),
blue = $('#blue').slider('value'),
hex = '#' + hexFromRGB(red, green, blue);
$('#swatch').text(hex);
$('#swatch').css('background-color', hex);
// why does not the following line work?
$('#myCanvas').css('background', 'radial-gradient(#FFFFFF, ' + hex + ');');
console.log('background: ' + $('#myCanvas').css('background'));
}
$('#red, #green, #blue').slider({
orientation: 'horizontal',
range: 'min',
slide: refreshSwatch,
change: refreshSwatch,
max: 255,
value: 127
});
$('#red').slider('value', 255);
$('#green').slider('value', 140);
$('#blue').slider('value', 60);
});
问题:
尽管我叫[#myCanvas
div的背景色也不变
$('#myCanvas').css('background', 'radial-gradient(#FFFFFF, ' + hex + ');');
而且我也尝试用冒号调用类似的代码:
$('#myCanvas').css('background: radial-gradient(#FFFFFF, ' + hex + ');');
同时#swatch
范围的背景颜色变化很好。
;
。删除它。