Sometimes you need to make lower case of the user input value or string. Using JQuery its very easy all you need to call
toLowerCase() method of the string and it will convert the input string to all lower case;
var stringVal = "Hello World"
stringVal = stringVal.toLowerCase();
//result will be : hello world
toLowerCase() method is supported by all the major web browser.
if you want to convert input string into uppercase please refer below post
JQuery convert string into uppercase