Home/ Questions/Q 8425425
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-10T04:16:01+00:00

Simple question: How does jQuery know what display mode an element should use when

  • 0

Simple question: How does jQuery know what display mode an element should use when using fadeIn?

What I mean, is that it appears to use the proper display mode for any element that I fadeIn, even when I set display:none initially in my CSS – images are using inline, divs are using block, etc.

I looked into the jQuery source code on GitHub, but I couldnt locate what I was looking for.

Reason I ask is because I am making a little plugin myself, using fade (but with Animate, since there is more than 1 property that needs animation).

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    It uses $.data to store it:

    console.log($._data( elem, "olddisplay" ));

    The underscore means that it can access data that is not normally available through $.data or $.fn.data. Basically this is for internal use only and you should not touch it.

    If the element is set to display:none through CSS, and you fade it in, jQuery still knows to make it inline etc. In this case, it uses the function 

    // Try to determine the default display value of an element
function css_defaultDisplay( nodeName ) {

    Which would give "inline" for a nodeName === "span"

    • 0