Contenteditable:如何在按del或退格时完全删除跨度

Question

我有一个contenteditable div,如下面的HTML所示(插入标记为|).

我想span.label在按下时删除backspace或delete(即跨度作为单个字母,因此对于用户来说,它看起来好像Name在一个单键中被删除)

<div contenteditable="true">
   Hallo, <span class="label">Name</span>|,
   this is a demonstration of placeholders!
   Sincerly, your
   <span class="label">Author</span>
</div>

Answer 1

您需要检查光标是否位于跨度结束的确切位置,如果是,请将其删除:

document.querySelector('div').addEventListener('keydown', function(event) {
    // Check for a backspace
    if (event.which == 8) {
        s = window.getSelection();
        r = s.getRangeAt(0)
        el = r.startContainer.parentElement
        // Check if the current element is the .label
        if (el.classList.contains('label')) {
            // Check if we are exactly at the end of the .label element
            if (r.startOffset == r.endOffset && r.endOffset == el.textContent.length) {
                // prevent the default delete behavior
                event.preventDefault();
                if (el.classList.contains('highlight')) {
                    // remove the element
                    el.remove();
                } else {
                    el.classList.add('highlight');
                }
                return;
            }
        }
    }
    event.target.querySelectorAll('span.label.highlight').forEach(function(el) { el.classList.remove('highlight');})
});

span.label.highlight {
    background: #E1ECF4;
    border: 1px dotted #39739d;
}

<div contenteditable="true">
 Hallo, <span class="label">Name</span>|,
 this is a demonstration of placeholders!
</div>

我没有实现del关键功能,但总体思路就在那里,我认为你可以根据上面的例子来完成它