keyboard appear when ready in mobile browser with using only javascript or jquery?

Is there any way to show keyboard with selected edit text. I used focus() which is perfectly work for in browser. I am able to edit text when browser is ready. Below is my code

$(document).ready(function() {
    var allSelects = document.getElementsByTagName("p");
    var lastSelect = allSelects[allSelects.length - 1];
    lastSelect.focus();

    $("#main_container").click(function() {

        lastSelect.focus();

    });
});

but when I load this site in mobile device then it not load mobile keyboard unless touch.

Here web-page for understanding page and here code code please find out the solution. Thanks in advance.

from keyboard appear when ready in mobile browser with using only javascript or jquery?