Created
July 8, 2019 22:23
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Throttle and debounce
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function throttle(delay, no_trailing, callback, debounce_mode) { | |
var timeout_id, | |
last_exec = 0; | |
if ( typeof no_trailing !== "boolean" ) { | |
debounce_mode = callback; | |
callback = no_trailing; | |
no_trailing = undefined; | |
} | |
function wrapper() { | |
var that = this, | |
elapsed = +new Date() - last_exec, | |
args = arguments; | |
function exec() { | |
last_exec = +new Date(); | |
callback.apply( that, args ); | |
} | |
function clear() { timeout_id = undefined; } | |
if ( debounce_mode && !timeout_id ) { exec(); } | |
timeout_id && clearTimeout( timeout_id ); | |
if ( debounce_mode === undefined && elapsed > delay ) { | |
exec(); | |
} | |
else if ( no_trailing !== true ) { | |
timeout_id = setTimeout( debounce_mode ? clear : exec, debounce_mode === undefined ? delay - elapsed : delay ); | |
} | |
} | |
if ( $.guid ) { | |
wrapper.guid = callback.guid = callback.guid || $.guid++; | |
} | |
return wrapper; | |
} | |
export { throttle }; |
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