Contenteditable：按删除或退格键时如何完全删除跨度

Question

我有一个 contenteditable div，如下面的 HTML 所示（由 | 标记的插入符号）。

我想在按 backspace 或 delete 时删除 span.label（即跨度充当单个字母，因此对于用户来说，它看起来好像 Name 在一次按键中被删除）

<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

您可以在 div 上监听 onKeyDown 事件：

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

这是事件监听处理程序：

        document.addEventListener('keydown', function (e) {
            var keycode = event.keyCode;
            console.log(keycode);
            if (keycode === 8 || keycode === 46) {
                var spnLables = document.querySelectorAll('#editable span.label');
                if (spnLables.length) {
                    Array.prototype.forEach.call(spnLables, function (thisnode) {
                        document.getElementById('editable').removeChild(thisnode);
                    });

                }

            }
        });

Answer 2

您需要检查光标是否位于跨度结束的确切位置，如果是 - 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>

I didn't implement the del key functionality, but the general idea is there and I think you can complete it based on the above example

Contenteditable：按删除或退格键时如何完全删除跨度

Contenteditable: How to completely remove span when pressing del or backspace

html

javascript

range

selection