Explain this query

Question

Hi, Can anyone explain this query? $(function() { var pgurl = window.location.href.substr(window.location.href.lastIndexOf("/") +1 ); $(".menu li a").each(function() { if ($(this).attr("href") == pgurl || $(this).attr("href") == '') $(this).addClass("active"); }); }); and why we add '1' in 3rd line (highlight with red color)? Thanks in advance.

Anubhav Chaudhary · Answer

It will give everything after last "/", and as obvious it would be your page name, so page name is fetched using this code.

Rajeesh Menoth · Answer

Hi, lastIndexOf() finds the last occurrence of your string in the string you're searching.So the first lastIndexOf() finds the last "/" in the href attribute of the link.+1 is needed, so that the url still contains the last "/". Ref : http://www.trans4mind.com/personal_development/JavaScript2/lastIndexOf.htm

Arjunan Selvam · Answer

Hi The highlighted code is used to retrieve the page name from the given url.If you want to understand it clearly,open your chrome -> Go to "Console" and do the following steps to understand clearly. For example - Visit the following URL for our testing & copy,paste in the console to check http://www.w3schools.com/jsref/jsref_substr.asp 1. window.location.href Result - "http://www.w3schools.com/" 2. window.location.href.lastIndexOf("/") Result - 30 3. window.location.href.substr(window.location.href.lastIndexOf("/") +1); Result - "jsref_substr.asp" Do these in the browser as i said,You will get a clear picture. Please mark this as answer once you feel this as right solution.

Karthikeyan K · Answer

Hi sir Try this 1. http://befused.com/javascript/get-filename-url 2. http://www.trans4mind.com/personal_development/JavaScript2/lastIndexOf.htm