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A PHP Error was encountered

Severity: Notice

Message: Undefined index: userid

Filename: views/question.php

Line Number: 191

Backtrace:

File: /var/www/html/cnasolution/site/application/views/question.php
Line: 191
Function: _error_handler

File: /var/www/html/cnasolution/site/application/controllers/Questions.php
Line: 419
Function: view

File: /var/www/html/cnasolution/site/index.php
Line: 315
Function: require_once

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How to run this AJAX JavaScript Coding?

My Source from W3 Schools : https://www.w3schools.com/js/tryit.asp?filename=tryjson_ajax_array

When I running this ajax example in w3 source it's running successfully.

When I try to execute the same code in my local its' not running .The code is below.

Is there I need any server for running this example.

ajax.html

    

Use the XMLHttpRequest to get the content of a file.

json_demo.txt

{     "name":"John",     "age":31,     "pets":[         { "animal":"dog", "name":"Fido" },         { "animal":"cat", "name":"Felix" },         { "animal":"hamster", "name":"Lightning" }     ] } 

How to run this file in my local computer? Help me to begin my Ajax Learning......

Download script demo [LINK] [Origin]
Download script demo [LINK 2] [Onedrive] Download script demo [LINK 2] [Google drive]