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resources/assets/js/demos/demo-product-landing.js

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+/*
+Name: 			Product Landing
+Written by: 	Okler Themes - (http://www.okler.net)
+Theme Version:	12.1.0
+*/
+
+(($ => {
+    /*
+	Quantity
+	*/
+    $('.quantity .plus').on('click',function(){
+        const $qty=$(this).parents('.quantity').find('.qty');
+        const currentVal = parseInt($qty.val());
+        if (!isNaN(currentVal)) {
+            $qty.val(currentVal + 1);
+        }
+    });
+
+    $('.quantity .minus').on('click',function(){
+        const $qty=$(this).parents('.quantity').find('.qty');
+        const currentVal = parseInt($qty.val());
+        if (!isNaN(currentVal) && currentVal > 0) {
+            $qty.val(currentVal - 1);
+        }
+    });
+})).apply( this, [ jQuery ]);