46 lines
1.2 KiB
JavaScript
46 lines
1.2 KiB
JavaScript
export function throttle(func, delay, options = {}) {
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let timeoutId;
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let lastExecTime = 0;
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let leadingExec = true;
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const { leading = true, trailing = true } = options;
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let cancelPendingExecution = false; // Flag to track cancellation
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const throttledFunction = function () {
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const context = this;
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const args = arguments;
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const elapsed = Date.now() - lastExecTime;
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function execute() {
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if (!cancelPendingExecution) { // Only execute if not cancelled
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func.apply(context, args);
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lastExecTime = Date.now();
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}
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}
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if (leadingExec && leading) {
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execute();
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leadingExec = false;
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const nextExecDelay = elapsed < delay ? delay - elapsed : 0;
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setTimeout(function () {
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leadingExec = true;
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}, nextExecDelay);
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} else if (!timeoutId && trailing) {
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timeoutId = setTimeout(function () {
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execute();
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timeoutId = null;
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}, delay - elapsed);
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}
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};
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// Add a cancel method to the throttled function
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throttledFunction.cancel = function () {
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cancelPendingExecution = true;
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clearTimeout(timeoutId);
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timeoutId = null;
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};
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return throttledFunction;
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}
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