I would like to create a fixed-position menu similar to Slashdot's comment filtration menu. How can I achieve this?

Have you ever noticed that Slashdot has a cool little feature that lets you adjust your comment threshold to filter out down-modded comments? When you scroll to the top of the page, it stays in one place, but as you continue scrolling down, it eventually switches to a fixed position and stays on your screen. (Check out an example here.)

So, my question is, how can I achieve the same effect of having a menu stay in one place when scrolled up and switch to a fixed position as the user scrolls down? I know that it will involve a combination of CSS and javascript. I'm not necessarily looking for a complete code example, but rather an explanation of the steps my code will need to take. Can you help me out?

javascriptcss

Answer №1

After some experimentation, I have come to a solution. Sharing it here in case it might benefit others. The implementation relies on the prototype framework and an internal library that provides essential functions like registerEvent, getElementX, and getElementY.

var MenuManager = Class.create({
    initialize: function initialize(menuElt) {
        this.menu = $(menuElt);
        this.homePosn = { x: getElementX(this.menu), y: getElementY(this.menu) };
        registerEvent(document, 'scroll', this.handleScroll.bind(this));
        this.handleScroll();
    },
    handleScroll: function handleScroll() {
        this.scrollOffset = document.viewport.getScrollOffsets().top;
        if (this.scrollOffset > this.homePosn.y) {
            this.menu.style.position = 'fixed';
            this.menu.style.top = 0;
            this.menu.style.left = this.homePosn.x;
        } else {
            this.menu.style.position = 'absolute';
            this.menu.style.top = null;
            this.menu.style.left = null;
        }
    }
});

To apply this functionality to your menu, simply instantiate the class with the menu's id.

Answer №2

Thank you for sharing this code with us. I've made some minor adjustments to ensure it is compatible with the latest version of Prototype framework.

var TableHeaderManager = Class.create({
    initialize: function initialize(headerElt) {
        this.tableHeader = $(headerElt);
        this.homePosn = { x: this.tableHeader.cumulativeOffset()[0], y: this.tableHeader.cumulativeOffset()[1] };
        Event.observe(window, 'scroll', this.handleScroll.bind(this));
        this.handleScroll();
    },
    handleScroll: function handleScroll() {
        this.scrollOffset = document.viewport.getScrollOffsets().top;
        if (this.scrollOffset > this.homePosn.y) {
            this.tableHeader.style.position = 'fixed';
            this.tableHeader.style.top = 0;
            this.tableHeader.style.left = this.homePosn.x;
        } else {
            this.tableHeader.style.position = 'absolute';
            this.tableHeader.style.top = null;
            this.tableHeader.style.left = null;
        }
    }
});

Answer №3

If you're interested in seeing a demonstration that is not related to the code provided, you can take a look at:

fixed-floating-elements

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