Css: Replacing A Text On Hover, But Smooth Transition To The New Text Does Not Work?

The scenario: If a user hovers over a text (e.g. an h1-tag), it should change to a new text. The new text should appear smoothly. What I've done so far: I was able to replace a t

Solution 1:

Here is a really simple sample

(This hidden snippet use pseudo elements instead of the visible's inner div's)

div, div:after, div:before {
    height: 100px;
    width: 100px;
    position: absolute;
    font-size: 40px;
    color: black
}

div:after {
    content: "New";
    opacity: 0;
}
div:before {
    content: "Old";
    opacity: 1;
}

div:after, div:before {
    transition: opacity 0.5s linear;
}

.wrap:hover:before {
    opacity: 0;
}
.wrap:hover:after {
    opacity: 1;
}

<divclass="wrap"></div>

div {
    height: 100px;
    width: 100px;
    position: absolute;
    font-size: 40px;
    color: black
}

.new {
    opacity: 0;
}

.old, .new {
    transition: opacity 0.5s linear;
}

.wrap:hover.old {
    opacity: 0;
}
.wrap:hover.new {
    opacity: 1;
}

<divclass="wrap"><divclass="new">New</div><divclass="old">Old</div></div>

Solution 2:

OK, so first part, you cannot animate the display property, you need a work-around. To do this we fall back to what we can animate, opacity and width/height

For what you are trying to accomplish, I'd use two spans inside the <h1> - one with each text version. Since spans are inline elements we give them display: block so we can control there dimensions more cleanly.

.my_div {
  background-color: red;
  transition: all 500ms ease-in-out;
}
.my_div:hover {
  background-color: green;
}
h1 {
  overflow: hidden;
}
.old-text,
.new-text {
  display: block;
  overflow: hidden;
  transition: all 500ms ease-in-out;
}
.old-text {
  height: auto;
  opacity: 1;
  width: auto;
}
.new-text {
  color: #fff;
  height: 0;
  opacity: 0;
  width: 0;
}
.my_div:hover.old-text {
  height: 0px;
  opacity: 0;
  width: 0px;
}
.my_div:hover.new-text {
  height: auto;
  opacity: 1;
  width: auto;
}

<divclass="my_div"><h1class="title"><spanclass="old-text">This is the old text</span><spanclass="new-text">A wild text appears!</span></h1></div>

Solution 3:

The question has already been answered, but I think the best approach would be to use a pseudo element. It's very simple and clean. BUT: you lose the transition effect.

.MySpecialTag:before
{
    content: "The old text";
}
.MySpecialTag:hover:before
{
    content: "The new text";
}

<h1class="MySpecialTag"></h1>