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 is not appears mobile keyboard unless touch.

please find out the solution. Thanks in advance

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