Поправлена структура, разделы в подразделы до 3.3

ИЭТР-тест/Develop/app/js/Number-Input-Spinner-jQuery-Nice-Number/dist/jquery.nice-number.css

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+.nice-number {
+  display: inline-flex;
+  justify-content: stretch;
+}
+.nice-number button{
+  width: 26px;
+  height: 26px;
+  padding: 0;
+  margin: 0;
+  border-radius: 2px 0 0 2px;
+}
+.nice-number input+button{
+  border-radius: 0 2px 2px 0;
+}
+
+.nice-number input {
+  vertical-align: middle;
+  -moz-appearance: textfield;
+  box-sizing: content-box;
+  margin: 0;
+  text-align: center;
+}
+
+.nice-number input::-webkit-inner-spin-button,
+.nice-number input::-webkit-outer-spin-button {
+  -webkit-appearance: none;
+  margin: 0;
+}

ИЭТР-тест/Develop/app/js/Number-Input-Spinner-jQuery-Nice-Number/dist/jquery.nice-number.js

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+(function ($) {
+  $.fn.niceNumber = function(options) {
+    var settings = $.extend({
+      autoSize: true,
+      autoSizeBuffer: 1,
+      buttonDecrement: '-',
+      buttonIncrement: "+",
+      buttonPosition: 'around'
+    }, options);
+
+    return this.each(function(){
+      var currentInput = this,
+          $currentInput = $(currentInput),
+          attrMax = null,
+          attrMin = null;
+
+      // Handle max and min values
+      if (
+        typeof $currentInput.attr('max') !== typeof undefined
+        && $currentInput.attr('max') !== false
+      ) {
+        attrMax = parseFloat($currentInput.attr('max'));
+      }
+
+      if (
+        typeof $currentInput.attr('min') !== typeof undefined
+        && $currentInput.attr('min') !== false
+      ) {
+        attrMin = parseFloat($currentInput.attr('min'));
+      }
+
+      // Fix issue with initial value being < min
+      if (
+        attrMin
+        && !currentInput.value
+      ) {
+        $currentInput.val(attrMin);
+      }
+
+      // Generate container
+      var $inputContainer = $('<div/>',{
+          class: 'nice-number'
+        })
+        .insertAfter(currentInput);
+
+      // Generate interval (object so it is passed by reference)
+      var interval = {};
+
+      // Generate buttons
+      var $minusButton = $('<button/>')
+        .attr('type', 'button')
+        .html(settings.buttonDecrement)
+        .on('mousedown mouseup mouseleave', function(event){
+          changeInterval(event.type, interval, function(){
+            if (
+              attrMin == null
+              || attrMin < parseFloat(currentInput.value)
+            ) {
+              currentInput.value--;
+            }
+          });
+
+          // Trigger the input event here to avoid event spam
+          if (
+            event.type == 'mouseup'
+            || event.type == 'mouseleave'
+          ) {
+            $currentInput.trigger('input');
+          }
+        });
+
+      var $plusButton = $('<button/>')
+        .attr('type', 'button')
+        .html(settings.buttonIncrement)
+        .on('mousedown mouseup mouseleave', function(event){
+          changeInterval(event.type, interval, function(){
+            if (
+              attrMax == null
+              || attrMax > parseFloat(currentInput.value)
+            ) {
+              currentInput.value++;
+            }
+          });
+
+          // Trigger the input event here to avoid event spam
+          if (
+            event.type == 'mouseup'
+            || event.type == 'mouseleave'
+          ) {
+            $currentInput.trigger('input');
+          }
+        });
+
+      // Append elements
+      switch (settings.buttonPosition) {
+        case 'left':
+          $minusButton.appendTo($inputContainer);
+          $plusButton.appendTo($inputContainer);
+          $currentInput.appendTo($inputContainer);
+          break;
+        case 'right':
+          $currentInput.appendTo($inputContainer);
+          $minusButton.appendTo($inputContainer);
+          $plusButton.appendTo($inputContainer);
+          break;
+        case 'around':
+        default:
+          $minusButton.appendTo($inputContainer);
+          $currentInput.appendTo($inputContainer);
+          $plusButton.appendTo($inputContainer);
+          break;
+      }
+
+      // Nicely size input
+      if (settings.autoSize) {
+        $currentInput.width(
+          $currentInput.val().length+settings.autoSizeBuffer+"ch"
+        );
+        $currentInput.on('keyup input',function(){
+          $currentInput.animate({
+            'width': $currentInput.val().length+settings.autoSizeBuffer+"ch"
+          }, 200);
+        });
+      }
+    });
+  };
+
+  function changeInterval(eventType, interval, callback) {
+    if (eventType == "mousedown") {
+      interval.timeout = setTimeout(function(){
+        interval.actualInterval = setInterval(function(){
+          callback();
+        }, 100);
+      }, 200);
+      callback();
+    } else {
+      if (interval.timeout) {
+        clearTimeout(interval.timeout);
+      }
+      if (interval.actualInterval) {
+        clearInterval(interval.actualInterval);
+      }
+    }
+  }
+}(jQuery));

ИЭТР-тест/Develop/app/js/Number-Input-Spinner-jQuery-Nice-Number/dist/jquery.nice-number.min.css

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+.nice-number{display:inline-flex;justify-content:stretch}.nice-number input{vertical-align:middle;-moz-appearance:textfield;box-sizing:content-box;margin:0;text-align:center}
+.nice-number input::-webkit-inner-spin-button,.nice-number input::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}

ИЭТР-тест/Develop/app/js/Number-Input-Spinner-jQuery-Nice-Number/dist/jquery.nice-number.min.js

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+!function(t){t.fn.niceNumber=function(n){var a=t.extend({autoSize:!0,autoSizeBuffer:1,buttonDecrement:"-",buttonIncrement:"+",buttonPosition:"around"},n);return this.each(function(){var n=this,u=t(n),o=null,i=null;void 0!==u.attr("max")&&!1!==u.attr("max")&&(o=parseFloat(u.attr("max"))),void 0!==u.attr("min")&&!1!==u.attr("min")&&(i=parseFloat(u.attr("min"))),i&&!n.value&&u.val(i);var r=t("<div/>",{class:"nice-number"}).insertAfter(n),l={},p=t("<button/>").attr("type","button").html(a.buttonDecrement).on("mousedown mouseup mouseleave",function(t){e(t.type,l,function(){(null==i||i<parseFloat(n.value))&&n.value--}),"mouseup"!=t.type&&"mouseleave"!=t.type||u.trigger("input")}),m=t("<button/>").attr("type","button").html(a.buttonIncrement).on("mousedown mouseup mouseleave",function(t){e(t.type,l,function(){(null==o||o>parseFloat(n.value))&&n.value++}),"mouseup"!=t.type&&"mouseleave"!=t.type||u.trigger("input")});switch(a.buttonPosition){case"left":p.appendTo(r),m.appendTo(r),u.appendTo(r);break;case"right":u.appendTo(r),p.appendTo(r),m.appendTo(r);break;case"around":default:p.appendTo(r),u.appendTo(r),m.appendTo(r)}a.autoSize&&(u.width(u.val().length+a.autoSizeBuffer+"ch"),u.on("keyup input",function(){u.animate({width:u.val().length+a.autoSizeBuffer+"ch"},200)}))})};function e(t,e,n){"mousedown"==t?(e.timeout=setTimeout(function(){e.actualInterval=setInterval(function(){n()},100)},200),n()):(e.timeout&&clearTimeout(e.timeout),e.actualInterval&&clearInterval(e.actualInterval))}}(jQuery);