在悬停时立即显示标题属性

Question

是否有可能在鼠标悬停时立即显示锚标记的标题属性,而不仅仅是在秒之后.JavaScript/jQuery和CSS中的任何解决方案都很好.

Answer 1

title属性的处理取决于浏览器,并且没有定义任何API来控制它,更少在规范中指定.这包括延迟,显示的持续时间,使用的字体,字体大小等.

有迹象表明,可以使用其他技术替代的title属性.其他答案中提到了其中一些.请注意,简单的"CSS工具提示"可以简单灵活地在纯CSS中实现.使用这些技术时,要显示的数据通常不属于title属性,因为它的处理依赖于浏览器,因此存在显示特殊工具提示和浏览器实现的风险title.尽管可以防止后者,但是当启用脚本时,使用对任何内容都没有默认效果的属性(例如data-title=...或)会更简单data-tooltip=....

Answer 2

一种方法:

// textFrom : String, the attribute from which the text
//            should come,
// delta :    String or Number, the distance from the cursor at
//            which the tooltip should appear
function instantTooltips(textFrom, delta) {
  // if delta exists, and can be parsed to a number, we use it,
  // otherwise we use the default of 5:
  delta = parseFloat(delta) ? parseFloat(delta) : 5;

  // function to handle repositioning of the created tooltip:
  function reposition(e) {
    // get the tooltip element:
    var tooltip = this.nextSibling;
    // setting the position according to the position of the
    // pointer:
    tooltip.style.top = (e.pageY + delta) + 'px';
    tooltip.style.left = (e.pageX + delta) + 'px';
  }

  // get all elements that have an attribute from which we
  // want to get the tooltip text from:
  var toTitle = document.querySelectorAll('[' + textFrom + ']'),
    //create a span element:
    span = document.createElement('span'),
    // find if we should use textContent or innerText (IE):
    textProp = 'textContent' in document ? 'textContent' : 'innerText',
    // caching variables for use in the upcoming forEach:
    parent, spanClone;
  // adding a class-name (for CSS styling):
  span.classList.add('createdTooltip');
  // iterating over each of the elements with a title attribute:
  [].forEach.call(toTitle, function(elem) {
    // reference to the element's parentNode:
    parent = elem.parentNode;
    // cloning the span, to avoid creating multiple elements:
    spanClone = span.cloneNode();
    // setting the text of the cloned span to the text
    // of the attribute from which the text should be taken:
    spanClone[textProp] = elem.getAttribute(textFrom);

    // inserting the created/cloned span into the
    // document, after the element:
    parent.insertBefore(spanClone, elem.nextSibling);

    // binding the reposition function to the mousemove
    // event:
    elem.addEventListener('mousemove', reposition);

    // we're setting textFrom attribute to an empty string
    // so that the CSS will still apply, but which
    // shouldl still not be shown by the browser:
    elem.setAttribute(textFrom, '');
  });
}

// calling the function:
instantTooltips('title', 15);

[title] {
  display: block;
  margin: 0 0 1em 0;
}

/*
  hiding, and styling, the elements we'll be creating
*/
[title] + span.createdTooltip {
  display: none;
  border: 2px solid #f90;
  background-color: rgba(255, 255, 255, 0.8);
  padding: 0.2em 0.5em;
  border-radius: 0.75em;
}

/*
  showing the created elements on hovering the element we want to
  show tooltips for
*/
[title]:hover + span.createdTooltip {
  display: block;
  position: absolute;
}

<span title="This is the span's title">A span element</span>
<img src="http://placekitten.com/g/250/250" title="A kitten." />
<input title="This is an input element's title." value="This input has a title" />

参考文献:

• 条件('三元')运算符.
• document.createElement().
• document.querySelectorAll().
• Element.classList.
• in运营商.
• Node.cloneNode().
• Node.nextSibling.
• Node.parentNode.
• parseFloat().
• typeof.

Answer 3

Bootstraps ToolTip 插件在这方面做得非常好，并且响应速度更快/更快。

只需要默认的引导文件即可运行。

CSS 可以更改以满足您的要求。

更多信息和示例可以在此处显示：

http://getbootstrap.com/javascript/#tooltips