How to Effectively Select and Activate Controls on AJAX-Driven Websites?

Selecting and Activating the Right Controls on an AJAX-Driven Site

When creating scripts to interact with dynamic, AJAX-driven websites, it's crucial to understand the underlying page structure and event handlers. Here's a step-by-step guide to effectively locate and manipulate elements on these websites.

1. Inspect Page Elements and Events

Using browser tools like Firebug or the DOM inspector, identify the CSS/jQuery selectors for elements you want to interact with. These tools also reveal the events attached to each element.

2. Map Events to Actions

Determine the sequence of events that trigger the desired actions. For instance, selecting a dropdown may involve a mousedown event, not a click.

3. Use WaitForKeyElements

The waitForKeyElements function is used to handle elements that are dynamically created or modified by JavaScript. It allows you to specify CSS selectors and a callback function to execute when the elements appear.

4. Sequence Actions

Use waitForKeyElements to create a series of steps, simulating user interactions in the correct order. Each callback function should perform actions and/or trigger events on the respective elements.

Example: Nike Auto-Buy Script

Goal: Automatically select shoe size, add to cart, and checkout on Nike.com sneaker pages.

Implementation:

waitForKeyElements(
    "div.footwear form.add-to-cart-form span.sizeDropdown a.size-dropdown",
    function(jNode) {
        triggerMouseEvent(jNode[0], "mousedown");
    }
);

waitForKeyElements(
    "ul.selectBox-dropdown-menu li a:contains('10')",
    function(jNode) {
        if ($.trim(jNode.text()) === "10") {
            triggerMouseEvent(jNode[0], "mouseover");
            triggerMouseEvent(jNode[0], "mousedown");
            triggerMouseEvent(jNode[0], "mouseup");
        }
    }
);

waitForKeyElements(
    "div.footwear form.add-to-cart-form span.sizeDropdown a.selectBox span.selectBox-label:contains('(10)')",
    function(jNode) {
        var addToCartButton = $(
            "div.footwear form.add-to-cart-form div.product-selections div.add-to-cart"
        );
        triggerMouseEvent(addToCartButton[0], "click");
    }
);

waitForKeyElements(
    "div.mini-cart div.cart-item-data a.checkout-button:visible",
    function(jNode) {
        triggerMouseEvent(jNode[0], "click");
    }
);

Explanation:

1. Step 1: Trigger a mousedown event on the shoe size dropdown.
2. Step 2: On dropdown open, select the desired shoe size ("10").
3. Steps 3 and 4: Wait for the display of the selected shoe size and click the "Add to Cart" button.
4. Step 5: When the mini-cart appears, click the "Checkout" button.

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