这是一个香草JavaScript解决方案:

var cells = document.getElementsByClassName("cell"); for(const cell of cells) { cell.addEventListener('mouseenter', setTitleIfNecessary, false); } function setTitleIfNecessary() { if(this.offsetWidth < this.scrollWidth) { this.setAttribute('title', this.innerHTML); } } .cell { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; border: 1px; border-style: solid; width: 120px; } <div class="cell">hello world!</div> <div class="cell">hello mars! kind regards, world</div>

这就是我最终基于https://stackoverflow.com/a/13259660/1714951所做的，并在元素不再溢出时添加title属性的删除。这是纯JS (ES6)，使用事件委托的性能(当使用几个元素与同一类)和保护子句的可读性:

// You may want to change document by an element closer to your target
// so that the handler is not executed as much
document.addEventListener( 'mouseenter', event => {
    let eventTarget = event.target;
    // This could be easily applied to text-truncate instead of my-class if you use bootstrap
    if ( !eventTarget.classList?.contains( 'my-class' ) ) {
        return;
    }
    if ( eventTarget.offsetWidth < eventTarget.scrollWidth ) {
        eventTarget.setAttribute( 'title', eventTarget.innerText );
        return;
    }
    eventTarget.removeAttribute( 'title' );
}, true );

这是我的jQuery插件:

(function($) {
    'use strict';
    $.fn.tooltipOnOverflow = function() {
        $(this).on("mouseenter", function() {
            if (this.offsetWidth < this.scrollWidth) {
                $(this).attr('title', $(this).text());
            } else {
                $(this).removeAttr("title");
            }
        });
    };
})(jQuery);

用法:

$("td, th").tooltipOnOverflow();

编辑:

我已经为这个插件做了一个要点。 https://gist.github.com/UziTech/d45102cdffb1039d4415

我有CSS类，它决定在哪里放省略号。在此基础上，我做以下操作(元素集可能不同，我写那些，使用省略号，当然它可以是一个单独的类选择器):

$(document).on('mouseover', 'input, td, th', function() {
    if ($(this).css('text-overflow') && typeof $(this).attr('title') === 'undefined') {
        $(this).attr('title', $(this).val());
    }
});

我创建了一个jQuery插件，使用Bootstrap的工具提示，而不是浏览器内置的工具提示。请注意，这还没有测试与旧的浏览器。

JSFiddle: https://jsfiddle.net/0bhsoavy/4/

$.fn.tooltipOnOverflow = function(options) {
    $(this).on("mouseenter", function() {
    if (this.offsetWidth < this.scrollWidth) {
        options = options || { placement: "auto"}
        options.title = $(this).text();
      $(this).tooltip(options);
      $(this).tooltip("show");
    } else {
      if ($(this).data("bs.tooltip")) {
        $tooltip.tooltip("hide");
        $tooltip.removeData("bs.tooltip");
      }
    }
  });
};

下面是另外两个纯CSS解决方案:

在适当的位置显示截短的文本:

.overflow { overflow: hidden; -ms-text-overflow: ellipsis; text-overflow: ellipsis; white-space: nowrap; } .overflow:hover { overflow: visible; } .overflow:hover span { position: relative; background-color: white; box-shadow: 0 0 4px 0 black; border-radius: 1px; } <div> <span class="overflow" style="float: left; width: 50px"> <span>Long text that might overflow.</span> </span> Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ad recusandae perspiciatis accusantium quas aut explicabo ab. Doloremque quam eos, alias dolore, iusto pariatur earum, ullam, quidem dolores deleniti perspiciatis omnis. </div>

显示任意的“工具提示”:

.wrap { position: relative; } .overflow { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; pointer-events:none; } .overflow:after { content:""; display: block; position: absolute; top: 0; right: 0; width: 20px; height: 15px; z-index: 1; border: 1px solid red; /* for visualization only */ pointer-events:initial; } .overflow:hover:after{ cursor: pointer; } .tooltip { /* visibility: hidden; */ display: none; position: absolute; top: 10; left: 0; background-color: #fff; padding: 10px; -webkit-box-shadow: 0 0 50px 0 rgba(0,0,0,0.3); opacity: 0; transition: opacity 0.5s ease; } .overflow:hover + .tooltip { /*visibility: visible; */ display: initial; transition: opacity 0.5s ease; opacity: 1; } <div> <span class="wrap"> <span class="overflow" style="float: left; width: 50px">Long text that might overflow</span> <span class='tooltip'>Long text that might overflow.</span> </span> Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ad recusandae perspiciatis accusantium quas aut explicabo ab. Doloremque quam eos, alias dolore, iusto pariatur earum, ullam, quidem dolores deleniti perspiciatis omnis. </div>