PhantomJS frozen stuck at blank terminal after trying use $.ajax

The code you're sharing appears to be using PhantomJS (a headless engine for running JavaScript in the browser without a graphical interface), and there are a few points where you might encounter problems. Here are some suggestions for potential errors and how to fix them:

Incorrect use of Promise within page.evaluate: Promises cannot be used directly within page.evaluate because the page.evaluate context runs in PhantomJS's virtual browser, and Promise is a modern feature that isn't fully supported in this context.

Solution: To handle promises within page.evaluate, you can use a callback approach or ensure that the asynchronous logic is well-organized so as not to interfere with the PhantomJS execution flow.

Problem with phantom.exit(): Using phantom.exit() may cause the process to terminate before page.evaluate or page.open completes. This method is asynchronous and runs outside the main program flow.

Solution: Ensure that phantom.exit() only runs after all operations have completed. This can be controlled by moving phantom.exit() inside the promise or after the last major operation.

Potential issue when using page.includeJs: Loading an external JavaScript file inside page.includeJs is also asynchronous. The JavaScript code that executes the AJAX request may not execute correctly if page.evaluate doesn't wait for the external library to fully load.

Solution: You can pass the callback function to page.includeJs to ensure the code runs after the jQuery file has successfully loaded.

Calling console.log inside page.evaluate: While this should work, keep in mind that the console.log inside page.evaluate runs in the context of the web page, not PhantomJS, so you'll need to listen for console messages properly.

var page = require('webpage').create();
console.log('required webpage');

page.onConsoleMessage = function(msg) {
    console.log(msg);
};
console.log('added message event handler');

page.open('', function() {
    console.log('page.opened \nnow in page context');
    page.render('opened.png');

    page.includeJs("https://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js", function() {
        console.log('jquery included');
        page.evaluate(function() {
            console.log('evaluating');

            function getMessages() {
                var deferred = new WebPage().create();
                deferred.content = new Promise(function(resolve, reject) {
                    $.ajax({
                        url: 'https://www.example.com/myrequest.php',
                        type: 'POST',
                        data: {
                            mychar_id: 32,
                            offset: 0,
                            limit: 10
                        },
                        success: function(data) {
                            if (data.trim() === '') {
                                console.log("received null");
                                reject("Received null data");
                            } else {
                                resolve(data);
                            }
                        },
                        error: function(xhr, status, error) {
                            console.log('AJAX Error:', error);
                            reject(error);
                        }
                    });
                });

                return deferred;
            }

            getMessages().then(data => {
                console.log(data);
            }).catch(error => {
                console.error(error);
            });

            console.log("extending jquery.");
            // JQuery stuff goes here.
            console.log('Final markup.');
            console.log(document.body.innerHTML);
        });

        page.render('done.png');
        console.log('exiting');
        phantom.exit();
    });
});