回答編集履歴
1
TreeWalkerでの例を追加。
test
CHANGED
@@ -3,3 +3,103 @@
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そこで、幅を固定し、text-overflow: ellipsis を使うのはどうでしょうか?
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[https://developer.mozilla.org/ja/docs/Web/CSS/text-overflow](https://developer.mozilla.org/ja/docs/Web/CSS/text-overflow)
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-- 追記。
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ノード操作をした一例です。ちょっとうんざりしてくるのではないでしょうか?
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```JavaScript
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function isHalf(code) {
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return (code >= 0x0 && code < 0x81) || (code == 0xf8f0) || (code >= 0xff61 && code < 0xffa0) || (code >= 0xf8f1 && code < 0xf8f4);
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}
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function truncateTextNode(textNode) {
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var text = textNode.nodeValue;
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var newText = '';
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for (var i = 0; i < text.length; i++) {
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var c = text.charCodeAt(i);
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var cost = isHalf(c) ? 0.5 : 1;
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if (cost > remain) {
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remain = -1;
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textNode.nodeValue = newText;
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return;
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}
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newText += text.charAt(i);
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remain -= cost;
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}
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textNode.nodeValue = newText;
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}
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var remain = 50;
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var root = document.querySelector('p.txt');
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var tw = document.createTreeWalker(root);
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var node;
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while (node = tw.nextNode()) {
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switch (node.nodeType) {
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case document.ELEMENT_NODE:
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if (remain < 0) {
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node.setAttribute('data-remove', '1');
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}
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break;
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case document.TEXT_NODE:
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truncateTextNode(node);
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break;
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}
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}
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if (remain < 0) {
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$(root.querySelectorAll('[data-remove]')).remove();
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root.appendChild(document.createTextNode('…'));
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}
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```
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