如何逐个淡入class为data的元素？调用fadeIn方法报错求助

Hey there! I see you're trying to get your .data elements to fade in one after another, but hitting errors when using index-based calls. Let's break down the problem and fix it step by step.

Why Your Current Code Fails #

When you use $(".data")[0], you're accessing the raw DOM element from the jQuery collection, not a jQuery object. Methods like fadeIn() and delay() are jQuery-specific—they won't work on native DOM nodes. That's exactly why you're seeing errors!

Step 1: Set Initial Hidden State #

First, your .data elements need to be hidden by default so fadeIn() has something to animate. You can do this either in CSS:

.data {
  width: 74%;
  background: red;
  height: 20px;
  position: absolute;
  right: 13%;
  display: none; /* Add this line to hide elements initially */
  display: flex;
  text-align: center;
}

Or with jQuery (if you don't want to modify your CSS):

$(".data").hide();

Step 2: Implement Sequential Fade-In #

Here are two reliable ways to make the elements fade in one after another:

Method 1: Target Elements Individually (For Small Fixed Sets) #

Use jQuery's .eq() method to get a jQuery object for each index, then chain delay() and fadeIn():

// Hide all elements first
$(".data").hide();

// Fade in each element with staggered delays
$(".data").eq(0).fadeIn(2000);
$(".data").eq(1).delay(2000).fadeIn(2000);
$(".data").eq(2).delay(4000).fadeIn(2000);
$(".data").eq(3).delay(6000).fadeIn(2000);

Method 2: Dynamic Loop (Best for Variable Number of Elements) #

Use .each() to loop through all .data elements, and use their index to calculate the delay dynamically—this works even if you add/remove elements later:

$(".data").hide().each(function(index) {
  // Delay increases by 2000ms for each subsequent element
  $(this).delay(index * 2000).fadeIn(2000);
});

Quick Breakdown of the Fix #

• .eq(index) returns a proper jQuery object (not a raw DOM node), so you can safely call jQuery methods on it.
• delay() adds a timed pause before the animation runs—using the element's index lets us stagger the timing perfectly.
• fadeIn(2000) animates the element from hidden to visible over 2 seconds.

内容的提问来源于stack exchange，提问作者Rnayak