javascript youtube like slider control
I've a question about implementing a slider control in a browser.
I need to playback data over time, in a browser. I will have one Worker filling the playback buffer by making calls to a REST api. The UI thread will then consume the buffer and playback the data to the user.
I want to simulate YouTube progress UI control. It shows you in a single UI control how much you've watc开发者_StackOverflow社区hed, and how much has been prefetched. Is it possible to adapt a slider control to do this ? The jQuery UI range slider isn't quite what I want
I currently use jQuery in my website, so would prefer a solution based on that framework.
You could just modify the jQuery UI slider a bit by using your own background image, then adjusting the width to show the load progress (demo):
$(function(){
var ytplayer = $('#player')[0],
// # seconds from YouTube API
duration = ytplayer.getDuration(),
// # bytes
totalBytes = ytplayer.getVideoBytesTotal(),
// start # bytes - may not be necessary
startBytes = ytplayer.getVideoStartBytes();
$("#slider").slider({
range: "max",
min: startBytes,
max: duration,
value: 1
})
// image: http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/blitzer/images/ui-bg_highlight-soft_15_cc0000_1x100.png
// with a 30% opacity
.css('background-image', 'url(http://i56.tinypic.com/fbjad2.png)');
// Loop to update slider
function loop() {
var time = ytplayer.getCurrentTime(),
// make loaded a percentage
loaded = 100 - (ytplayer.getVideoBytesLoaded() / totalBytes) * 100;
// set limit - no one likes negative widths
if (loaded < 0) { loaded = 0; }
// update time on slider
$('#slider')
.slider('option', 'value', time)
.find('.ui-widget-header').css('width', loaded + '%');
// repeat loop as needed
if (loaded < 0 || time < duration) {
setTimeout(loop, 500);
}
}
loop();
});
Maybe try also goog.ui.Slider from Google Closure library?
Click on the "demo" link on that page to see a demo.
You can overlay a transparent div on top of the slider which indicates how much data was pre-fetched (maybe using a table with increasing widths and a colourful but transparent background).
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