I am setting up the nginx for our office eCommerce website.i create a lets encrypt ssl and the certificate is working fine. i checked on ssl shopper. I want to configure the ssl only for store not for all the site.so i redirect the store from 80 to 443 and only the store want to work ssl. but after i configure
on nginx some buttons (javascriptvoid) not working. its says mixed content , so when i check on view source its shows the url of the buttons are still http in store page.(it should be https) .

i check with everything, i reconfigure nginx, check the tomcat side, all are oky.i dont knwo what is the issue.

my nginx configuration is here for you

(The(/sub) sub location is the one which i want to work https)

NGINX configuration

upstream backend_front {
    ip_hash;

    server tomcat_serverip:8080;

}

server {
    listen       80;
    server_name  www.domianname.com;

    charset utf-8;

   access_log  /var/log/nginx/80access.log main;

     location / {
    proxy_pass   http://backend_front;

        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }


    location /sub/ {

        if ($http_x_forwarded_proto != 'https') {
            return       301 https://$server_name$request_uri;
        }

       proxy_pass   http://backend_front;

        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

    }

}

server {
    listen       443 ssl;
    server_name  www.domainname.my;

    ssl on;
    ssl_certificate         /etc/letsencrypt/live/fullch.pem;
    ssl_certificate_key     /etc/letsencrypt/live/privkey.pem;

    ssl_session_cache shared:SSL:20m;
    ssl_session_timeout 15m;

    ssl_prefer_server_ciphers       on;
    ssl_protocols                   TLSv1 TLSv1.1 TLSv1.2;
    ssl_ciphers                     ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:!aNULL:!MD5:!DSS;


    charset utf-8;
    access_log  /var/log/nginx/443access.log main;

    add_header Strict-Transport-Security "max-age=31536000";


        root /data/resources/;

location /sub/ {

       proxy_pass   http://backend_front;

        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;


    }

    location / {
        proxy_pass   http://backend_front;

        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
}


  # for static files caching 
    location ~ .*\.(html|jsp)?$ {
        proxy_pass http://backend_front;

        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
    }

    location ~ .*\.(gif|jpg|jpeg|bmp|png|ico|txt|js|css)$ {
        root /data/resources/;
        expires 20m;
    }    # for static files caching -- end 

    location ~ /favicon\.ico {
        root html;
    }

    location ~ /\. {
        deny all;
    }
}

The view source result for the buttons

<a href="javascript:void(0)" url="http://www.example.com/store/account.htm" onclick="tiaozhuan(this)" style="padding:0px">Manage Account</a>
<a href="javascript:void(0)" url="http://www.example.com/store/order.htm" onclick="tiaozhuan(this)" style="padding:0px">My Orders</a>

When I click on the button this error message showing on google chrome element console (but for http its working fine.)

jquery-1.8.3.min.js:2 Mixed Content: The page at 'https://www.example.com/store/account.htm' was loaded over HTTPS, but requested an insecure XMLHttpRequest endpoint 'http://www.example.com/isLogin.htm'. This request has been blocked; the content must be served over HTTPS.
send    @   jquery-1.8.3.min.js:2
ajax    @   jquery-1.8.3.min.js:2
tiaozhuan   @   account.htm:155
onclick @   account.htm:77

please help me guys on this.i am stuck on thi for last 1 week to fix this.i am not a programmer i am a sys admin. and new for nginx.please help on this.