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fixes #170, fixes #266 ... reimplementing throttle in terms of debounce.

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This commit is contained in:
Jeremy Ashkenas
2011-10-24 13:13:24 -04:00
parent cfec39fd4e
commit b4d9503340
2 changed files with 43 additions and 19 deletions
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42
underscore.js
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@@ -520,8 +520,29 @@
return _.delay.apply(_, [func, 1].concat(slice.call(arguments, 1)));
};
// Internal function used to implement `_.throttle` and `_.debounce`.
var limit = function(func, wait, debounce) {
// Returns a function, that, when invoked, will only be triggered at most once
// during a given window of time.
_.throttle = function(func, wait) {
var timeout, context, args, throttling, finishThrottle;
finishThrottle = _.debounce(function(){ throttling = false; }, wait);
return function() {
context = this; args = arguments;
var throttler = function() {
timeout = null;
func.apply(context, args);
finishThrottle();
};
if (!timeout) timeout = setTimeout(throttler, wait);
if (!throttling) func.apply(context, args);
if (finishThrottle) finishThrottle();
throttling = true;
};
};
// Returns a function, that, as long as it continues to be invoked, will not
// be triggered. The function will be called after it stops being called for
// N milliseconds.
_.debounce = function(func, wait) {
var timeout;
return function() {
var context = this, args = arguments;
@@ -529,24 +550,11 @@
timeout = null;
func.apply(context, args);
};
if (debounce) clearTimeout(timeout);
if (debounce || !timeout) timeout = setTimeout(throttler, wait);
clearTimeout(timeout);
timeout = setTimeout(throttler, wait);
};
};
// Returns a function, that, when invoked, will only be triggered at most once
// during a given window of time.
_.throttle = function(func, wait) {
return limit(func, wait, false);
};
// Returns a function, that, as long as it continues to be invoked, will not
// be triggered. The function will be called after it stops being called for
// N milliseconds.
_.debounce = function(func, wait) {
return limit(func, wait, true);
};
// Returns a function that will be executed at most one time, no matter how
// often you call it. Useful for lazy initialization.
_.once = function(func) {