问题
I am trying to work with Jquery UI slider where I can have multiple handles:
$(function () {
var handlers = [25, 50, 75];
$("#slider").slider({
min: 0,
max: 100,
values: handlers,
slide: function (evt, ui) {
for (var i = 0, l = ui.values.length; i < l; i++) {
if (i !== l - 1 && ui.values[i] > ui.values[i + 1]) {
return false;
}
else if (i === 0 && ui.values[i] < ui.values[i - 1]) {
return false;
}
}
}
});
});
Please note that one handler can't overlap and I will need to set the handler dynamically on load, and save the handler positions on change.
The thing that i am trying to accomplish is to color the ui-content betweent the handler to different colors. I have attached the an Image.
Please advice if this is possible.
回答1:
One possibility would be to set the slider background to a CSS gradient and to update the gradient stops in code when the slider values change:
$(function () {
// the code belows assume the colors array is exactly one element bigger
// than the handlers array.
var handlers = [25, 50, 75];
var colors = ["#ff0000", "#00ff00", "#0000ff", "#00ffff"];
updateColors(handlers);
$("#slider").slider({
min: 0,
max: 100,
values: handlers,
slide: function (evt, ui) {
updateColors(ui.values);
}
});
function updateColors(values) {
var colorstops = colors[0] + ", "; // start left with the first color
for (var i=0; i< values.length; i++) {
colorstops += colors[i] + " " + values[i] + "%,";
colorstops += colors[i+1] + " " + values[i] + "%,";
}
// end with the last color to the right
colorstops += colors[colors.length-1];
/* Safari 5.1, Chrome 10+ */
var css = '-webkit-linear-gradient(left,' + colorstops + ')';
$('#slider').css('background-image', css);
}
});
http://jsfiddle.net/LLfWd/60/
This code works for chrome and safari. My guess is you just have to generate multiple gradient strings (for -moz-linear-gradient, -ms-linear-gradient, etc...) the way I did it for -webkit-linear-gradient here.
回答2:
(⌐■_■) Hello there, my code attached below implements (i) 3 JQuery UI Slider handles which means 4 ranges, (ii) non-collision of range values, (iii) coloring of ranges, (iv) title tooltip on handle and (v) display of range values. Please note that I am using an old JQuery version. Also, it has a pattern which means it can likely be re-coded to support >=4 handles elegantly as well.
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Test Slider</title>
<link type="text/css" href="css/jquery-ui-1.7.2.custom.css" rel="stylesheet" />
<script src="js/jquery-1.3.2.min.js" type="text/javascript"></script>
<script src="js/jquery-ui-1.7.2.custom.min.js" type="text/javascript"></script>
</head>
<body>
<style>
div.demo { padding: 10px !important; };
</style>
<div class="demo">
<p>
<label>% Style:</label>
<input type="text" id="weightage_style" style="border:0; color:#f6931f; font-weight:bold;" />
<br />
<label>% Design:</label>
<input type="text" id="weightage_design" style="border:0; color:#f6931f; font-weight:bold;" />
<br />
<label>% Correctness:</label>
<input type="text" id="weightage_correctness" style="border:0; color:#f6931f; font-weight:bold;" />
<br />
<label>% Others:</label>
<input type="text" id="weightage_others" style="border:0; color:#f6931f; font-weight:bold;" />
<br />
</p>
<div id="weightage_slider" style="font-size:12px;width:300px;"></div>
</div>
<script>
$( "#weightage_slider" ).slider({
min: 0,
max: 100,
orientation: "horizontal",
step: 1,
values: [ 10, 40, 90 ], // set three handles
slide: function( event, ui ) {
// NOTE: during slide, the following sequence occurs: (i) change ui.value (ii) call this function (iii) move the slider handle
// these four lines update the display of handle ranges
$( "#weightage_style" ).val( "0" + " - " + $( "#weightage_slider" ).slider('values', 0) );
$( "#weightage_design" ).val( $( "#weightage_slider" ).slider('values', 0) + " - " + $( "#weightage_slider" ).slider('values', 1) );
$( "#weightage_correctness" ).val( $( "#weightage_slider" ).slider('values', 1) + " - " + $( "#weightage_slider" ).slider('values', 2) );
$( "#weightage_others" ).val( $( "#weightage_slider" ).slider('values', 2) + " - " + "100" );
if ( ui.handle == $( "#weightage_slider_0" ).get(0) ) {
if(ui.values[ 0 ] >= ui.values[ 1 ]){
$( "#weightage_slider" ).slider('values', 0, ui.values[ 1 ]); // triggers change event
return false;
} else {
// handle-0 will move
// update display of colored handle ranges
$( "#weightage_slider_a" ).css('left', '0%');
$( "#weightage_slider_a" ).css('width', (ui.values[ 0 ] + '%'));
$( "#weightage_slider_b" ).css('left', (ui.values[ 0 ] + '%'));
$( "#weightage_slider_b" ).css('width', ((ui.values[1] - ui.values[0]) + '%'));
}
}
if ( ui.handle == $( "#weightage_slider_1" ).get(0) ) {
if(ui.values[ 1 ] <= ui.values[ 0 ]){
$( "#weightage_slider" ).slider('values', 1, ui.values[ 0 ]); // triggers change event
return false;
}else if(ui.values[ 1 ] >= ui.values[ 2 ]){
$( "#weightage_slider" ).slider('values', 1, ui.values[ 2 ]); // triggers change event
return false;
}else{
// handle-1 will move
// update display of colored handle ranges
$( "#weightage_slider_b" ).css('left', (ui.values[ 0 ] + '%'));
$( "#weightage_slider_b" ).css('width', ((ui.values[1] - ui.values[0]) + '%'));
$( "#weightage_slider_c" ).css('left', (ui.values[ 1 ] + '%'));
$( "#weightage_slider_c" ).css('width', ((ui.values[2] - ui.values[1]) + '%'));
}
}
if ( ui.handle == $( "#weightage_slider_2" ).get(0) ) {
if(ui.values[ 2 ] <= ui.values[ 1 ]){
$( "#weightage_slider" ).slider('values', 2, ui.values[ 1 ]); // triggers change event
return false;
} else{
// handle-2 will move
// update display of colored handle ranges
$( "#weightage_slider_c" ).css('left', (ui.values[ 1 ] + '%'));
$( "#weightage_slider_c" ).css('width', ((ui.values[2] - ui.values[1]) + '%'));
$( "#weightage_slider_d" ).css('left', (ui.values[ 2 ] + '%'));
$( "#weightage_slider_d" ).css('width', ((100 - ui.values[2]) + '%'));
}
}
},
change: function( event, ui ) {
// because slide event has function that changes handles' value programmatically, the following is necessary
// these four lines update the display of handle ranges
$( "#weightage_style" ).val( "0" + " - " + $( "#weightage_slider" ).slider('values', 0) );
$( "#weightage_design" ).val( $( "#weightage_slider" ).slider('values', 0) + " - " + $( "#weightage_slider" ).slider('values', 1) );
$( "#weightage_correctness" ).val( $( "#weightage_slider" ).slider('values', 1) + " - " + $( "#weightage_slider" ).slider('values', 2) );
$( "#weightage_others" ).val( $( "#weightage_slider" ).slider('values', 2) + " - " + "100" );
// update display of colored handle ranges
$( "#weightage_slider_a" ).css('left', '0%');
$( "#weightage_slider_a" ).css('width', (ui.values[ 0 ] + '%'));
$( "#weightage_slider_b" ).css('left', (ui.values[ 0 ] + '%'));
$( "#weightage_slider_b" ).css('width', ((ui.values[1] - ui.values[0]) + '%'));
$( "#weightage_slider_c" ).css('left', (ui.values[ 1 ] + '%'));
$( "#weightage_slider_c" ).css('width', ((ui.values[2] - ui.values[1]) + '%'));
$( "#weightage_slider_d" ).css('left', (ui.values[ 2 ] + '%'));
$( "#weightage_slider_d" ).css('width', ((100 - ui.values[2]) + '%'));
}
});
// label each slider handle
$( "#weightage_slider > a" ).each(function(index){
$(this).attr('id', 'weightage_slider_' + index);
$(this).attr('title', 'slider handle ' + index);
});
// the following four div tags result in the display of colored handle ranges
// the following left attributes and width attributes should be consistent with slider initialization - values array
$('#weightage_slider').append("<div id='weightage_slider_a' class='ui-slider-range' style='left:0%;width:10%;background-color:#41d862;'></div>");
$('#weightage_slider').append("<div id='weightage_slider_b' class='ui-slider-range' style='left:10%;width:30%;background-color:#41b7d8;'></div>");
$('#weightage_slider').append("<div id='weightage_slider_c' class='ui-slider-range' style='left:40%;width:50%;background-color:#d841b7;'></div>");
$('#weightage_slider').append("<div id='weightage_slider_d' class='ui-slider-range' style='left:90%;width:10%;background-color:#d86241;'></div>");
// these four lines display the initial handle ranges
$( "#weightage_style" ).val( "0" + " - " + $( "#weightage_slider" ).slider('values', 0) );
$( "#weightage_design" ).val( $( "#weightage_slider" ).slider('values', 0) + " - " + $( "#weightage_slider" ).slider('values', 1) );
$( "#weightage_correctness" ).val( $( "#weightage_slider" ).slider('values', 1) + " - " + $( "#weightage_slider" ).slider('values', 2) );
$( "#weightage_others" ).val( $( "#weightage_slider" ).slider('values', 2) + " - " + "100" );
</script>
</body>
Bug: If handles are dragged to most left, they become "stuck", so you might want to have a reset button to restore handles' position.
来源：https://stackoverflow.com/questions/10485075/slider-with-multiple-handle-and-background-color-for-content