How to Display Tooltips Only When Text is Truncated with Ellipsis?

Showing Tooltips Only When Ellipsis is Applied

Web developers often encounter situations where dynamic content needs to be contained within a fixed width, leading to the use of ellipsis styles to truncate the overflow. In such scenarios, providing additional information through tooltips can enhance the user experience, but it's desirable to display the tooltip only when the ellipsis is visible.

To achieve this, one approach involves using JavaScript to detect the presence of ellipsis and dynamically add the tooltip content only when it's applicable. Utilizing the built-in ellipsis functionality and jQuery, the following code accomplishes this task:

<code class="javascript">$('.mightOverflow').bind('mouseenter', function() {
    var $this = $(this);

    if (this.offsetWidth < this.scrollWidth && !$this.attr('title')) {
        $this.attr('title', $this.text());
    }
});</code>

This code employs the mouseenter event to bind a hover handler to elements with the mightOverflow class. Within the handler, it checks if the element's width is less than its scroll width, indicating the presence of ellipsis. If so, and the element does not yet have a title attribute, the tooltip content is dynamically added using the element's text as the tooltip's content.

This technique ensures that the tooltip appears only when the ellipsis is visible, providing an unobtrusive and informative enhancement to the user interface.

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