How do I display tooltip text for HTML <input> element using CSS style and data-title attribute?

问题

I am attempting to display tooltip like text using the data-title attribute for an HTML control.

I used the following technique for a element, and it works fine.

HTML Element:

<span class="spanNewID" data-title="Tooltip Text">816631-20319G14440 </span>

CSS Style:

span.spanNewID[data-title]:hover:after {
    opacity: 1;
    transition: all 0.1s ease 0.5s;
    visibility: visible;
}

span.spanNewID[data-title]:after {
    content: attr(data-title);
    background-color: lightblue;
    color: #111;
    font-size: 12pt;
    font-weight: bold;
    position: absolute;
    padding: 1px 5px 2px 5px;
    bottom: -1.6em;
    left: 100%;
    white-space: nowrap;
    box-shadow: 1px 1px 3px #222222;
    opacity: 0;
    border: 1px solid #111111;
    z-index: 99999;
    visibility: hidden;
}

span.spanNewID[data-title] {
    position: relative;
}

The above code snippet works to correctly display my css based tooltip.

I am trying to apply the same selector to an element. Consider the following:

HTML Element:

<input type="submit" value="Click Me" class="inuse" data-title="Input ELement Help"> </input>

CSS Style:

input.inuse[data-title]:hover:after {
    opacity: 1;
    transition: all 0.1s ease 0.5s;
    visibility: visible;
}

input.inuse[data-title]:after {
    content: attr(data-title);
    background-color: lightblue;
    color: #111;
    font-size: 12pt;
    font-weight: bold;
    position: absolute;
    padding: 1px 5px 2px 5px;
    bottom: -1.6em;
    left: 100%;
    white-space: nowrap;
    box-shadow: 1px 1px 3px #222222;
    opacity: 0;
    border: 1px solid #111111;
    z-index: 99999;
    visibility: hidden;
}

input.inuse[data-title] {
    position: relative;
}

The hover text/tooltip does not display in this case. I do not see any errors. There are no visible changes on the page. I attempted to use the css selector in the Chrome "CSS Selector Tester" and the selector works as expected.

What am I missing/doing wrong here?

Thanks,JohnB

回答1:

I did a bit of Googling myself, and came up with some interesting information. First off, pseduo-selectors :before and :after should be used on container elements.

Potentially you could use <button></button> instead of <input> and achieve the effect you desire:

.inuse[data-title]:hover:after {
    opacity: 1;
    transition: all 0.1s ease 0.5s;
    visibility: visible;
}

.inuse[data-title]:after {
    content: attr(data-title);
    background-color: lightblue;
    color: #111;
    font-size: 12pt;
    font-weight: bold;
    position: absolute;
    padding: 1px 5px 2px 5px;
    bottom: -1.6em;
    left: 100%;
    white-space: nowrap;
    box-shadow: 1px 1px 3px #222222;
    opacity: 0;
    border: 1px solid #111111;
    z-index: 99999;
    visibility: hidden;
}

.inuse[data-title] {
    position: relative;
}

<button type="submit" value="Click Me" class="inuse" data-title="Input ELement Help">Click Me</button>

Or, and I'm sure you've considered this but it's worth mentioning anyway, just use the title attribute:

<input type="submit" value="Click Me" class="inuse" data-title="Input ELement Help" title="Input ELement Help">

来源：https://stackoverflow.com/questions/57154686/how-do-i-display-tooltip-text-for-html-input-element-using-css-style-and-data