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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

Reproducible example in QML:

import QtQuick 2.12 import QtQuick.Window 2.12 import QtQuick.Controls 2.0  Window {     visible: true     width: 640     height: 480      Component.onCompleted: getPage(logResults)      function logResults(results) {         console.log("RESULTS: " + results)     }      function getPage(callback) {         var xhttp = new XMLHttpRequest();         var url = "https://www.google.com/"          xhttp.onreadystatechange = function() {             if (xhttp.readyState === 4 && xhttp.status === 200) {                 console.log("calling callback")                 callback(xhttp.responseText)                             }         };         xhttp.open("GET", url);         xhttp.send();     } } 

Output I get:

qml: calling callback 

Output I expect:

qml: calling callback qml: RESULTS:  

The xhttp.responseText is not empty or undefined, in fact the console.log() throws no errors. Reformat the code like so:

        xhttp.onreadystatechange = function() {             if (xhttp.readyState === 4 && xhttp.status === 200) {                 console.log("Am I alive?")                 console.log("response text: " + xhttp.responseText)                 console.log("I am alive")             }         }; 

then I get output:

qml: Am I alive? qml: I am alive 

Why does XMLHttpRequest responseText not exist? Why does it kill the console.log() and not throw an 'undefined' or some other error? Is there a better way to scrape the html from this web page?

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