I have this Login/Signup link on which when user clicks,it pops up a login window.
Now when a user has to login he can simply login through this pop window.
This is the code for the login/signup link
<a id="modal_trigger" href="#modal" style="margin-top:6px; margin-right:14px">Login|Signup</a>
Given is the Jquery for the pop up window
  $("#modal_trigger").leanModal({top : 50, overlay : 0.6, closeButton: ".modal_close" });
$(function(){
    // Calling Login Form
    $("#login_form").click(function(){
        $(".social_login").hide();
        $(".user_login").show();
        return false;
    });
    // Calling Register Form
    $("#register_form").click(function(){
        $(".social_login").hide();
        $(".user_register").show();
        $(".header_title").text('Register');
        return false;
    });
    // Going back to Social Forms
    $(".back_btn").click(function(){
        $(".user_login").hide();
        $(".user_register").hide();
        $(".social_login").show();
        $(".header_title").text('Login');
        return false;
    });
})
Note : i have tried this document.getElementById('modal_trigger').click(); and possibly this might be a duplication of this question How do I programmatically click a link with javascript? but i don't seem to get my answer.
Question : Pop up window comes only comes up when user clicks the 'Login/Signup' hyperlink.How do i make this pop up to come programmingly ?
Update:
$( document ).ready(function() {
    $("#modal_trigger")[0].click();
});
$( document ).ready(function() {
    $(function() {
        $("#modal_trigger").leanModal({top: 50, overlay: 0.6, closeButton: ".modal_close"});
        $(function () {
            // Calling Login Form
            $("#login_form").click(function () {
                $(".social_login").hide();
                $(".user_login").show();
                return false;
            });
            // Calling Register Form
            $("#register_form").click(function () {
                $(".social_login").hide();
                $(".user_register").show();
                $(".header_title").text('Register');
                return false;
            });
            // Going back to Social Forms
            $(".back_btn").click(function () {
                $(".user_login").hide();
                $(".user_register").hide();
                $(".social_login").show();
                $(".header_title").text('Login');
                return false;
            });
        })
    });
});
Tried This one as well.Didn't work.
CODEPEN : http://codepen.io/monkeytempal/pen/VvKLMe Here is the working code in codepen.

 
     
     
     
     
    