Question

I’m trying to create a tab menu. And I need this coded in regular javascript, not jquery.

$(document).ready(function() {
//When page loads...
$(".general_info_content").hide(); //Hide all content
$("ul.general_info_tabs li:first").addClass("active").show(); //Activate first tab
$(".general_info_content:first").show(); //Show first tab content

//On Click Event
$("ul.general_info_tabs li").click(function() {

    $("ul.general_info_tabs li").removeClass("active"); //Remove any "active" class
    $(this).addClass("active"); //Add "active" class to selected tab
    $(".general_info_content").hide(); //Hide all tab content

    var activeTab = $(this).find("a").attr("href"); //Find the href attribute value to identify the active tab + content
    $(activeTab).fadeIn(); //Fade in the active ID content
    return false;
});
});

Answer 1

The core of what you want to do is below – I’m sure there are a thousand different ways to do each task:

Remove a CSS class from an element:

var classes = document.getElementById([id]).className.split(" ");
for(var i = 0; i < classes.length; i++)
    if(classes[i] == removeClass) 
          classes[i] = "";
document.getElementById([id]).className = classes.join(" ");

Add a CSS class to an element:

document.getElementById([i]).className += " " + addClassName;

Hide an element:

document.getElementById([i]).style.display = "none";

Fade an element:

// not tested, but based on tested/used code
function fade(el, opacity, fadeInTime) {
     if (opacity < 100) {
          el.style.opacity = opacity / 100;
          el.style.filter = "alpha(opacity=" + opacity + ")";
          opacity += 5;

          setTimeout(function () { fade(el, opacity, fadeInTime); }, fadeInTime / 5);
     }
}

To find all elements by CSS and tag name:

var matches = new Array();
var all = document.getElementByTagName(searchTagName);
for(var i = 0; i < all.length; i++){
     if(all[i].className.replace(searchClassName, "") != all[i].className) {
           matches.push(all[i].className);
     }
}
// do something with (i.e., return or process) matches

And for the record, I find it encouraging, not unreasonable, that a person using the jQuery library wants to know how to do get things done with native JS/DOM.