Added function to validate HTTP URL

web/static/custom/custom.js

@@ -2531,3 +2531,15 @@ function highlight_search(search_keyword, content){
 	var reg = new RegExp('('+search_keyword+')', 'gi');
 	return content.replace(reg, '<mark>$1</mark>');
 }
+
+
+function validURL(str) {
+	// checks for valid http url
+  var pattern = new RegExp('^(https?:\\/\\/)?'+ // protocol
+    '((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|'+ // domain name
+    '((\\d{1,3}\\.){3}\\d{1,3}))'+ // OR ip (v4) address
+    '(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*'+ // port and path
+    '(\\?[;&a-z\\d%_.~+=-]*)?'+ // query string
+    '(\\#[-a-z\\d_]*)?$','i'); // fragment locator
+  return !!pattern.test(str);
+}