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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
/* Source: https://underscorejs.org/underscore-esm.js During a given window of time. Normally, the throttled function will run as much as it can, without ever going more than once per `wait` duration; but if you'd like to disable the execution on the leading edge, pass `{leading: false}`. To disable execution on the trailing edge, ditto. */ function throttle(func, wait, options) { var timeout, context, args, result; var previous = 0; if (!options) options = {}; var later = function () { previous = options.leading === false ? 0 : Date.now(); timeout = null; result = func.apply(context, args); if (!timeout) context = args = null; }; var throttled = function () { var _now = Date.now(); if (!previous && options.leading === false) previous = _now; var remaining = wait - (_now - previous); context = this; args = arguments; if (remaining <= 0 || remaining > wait) { if (timeout) { clearTimeout(timeout); timeout = null; } previous = _now; result = func.apply(context, args); if (!timeout) context = args = null; } else if (!timeout && options.trailing !== false) { timeout = setTimeout(later, remaining); } return result; }; throttled.cancel = function () { clearTimeout(timeout); previous = 0; timeout = context = args = null; }; return throttled; }
Lodash and underscore are 2 popular utility libraries.