How to check if a query string value is present via JavaScript?

Question

How can I check if the query string contains a q= in it using JavaScript or jQuery?

Answer 1

The plain javascript code sample which answers your question literally:

return location.search.indexOf('q=')>=0;

The plain javascript code sample which attempts to find if the q parameter exists and if it has a value:

var queryString=location.search;
var params=queryString.substring(1).split('&');
for(var i=0; i