如何使.innerText忽略不可见元素的不可见子元素? [英] How can I make `.innerText` ignore invisible children of an invisible element?
问题描述
以下测试代码的结果:
div[0].innerText === "aaaaa zzzzz"
div[1].innerText === "aaaaainvisiblezzzzz"
如何强制innerText
为div[1]
赋予与div[0]
相同的结果?
How can I force innerText
to give the same result for div[1]
as it gives for div[0]
?
我尝试将div[1]
附加到临时文档中,但是由于该文档并未真正显示,因此没有帮助.仅将其附加到字面上可见的文档中即可.
I’ve tried to append div[1]
to a temporary document but, since the document wasn’t actually displayed, it didn’t help. Only appending it to a literally visible document works.
var div = [];
div[0] = document.getElementById("visible");
div[1] = div[0].cloneNode(true);
show(0);
show(1);
function show(i) {
document.getElementById("output").innerHTML +=
"<p>div[" + i + "].innerText === <code>" +
div[i].innerText.replace(/\n/g, "") + "</code></p>";
}
#visible {display: block; font-family: sans-serif; font-size: larger; color: red;}
code {background-color: lightgray; padding: 0 .318em;}
<div id="visible">
<span style="display: inline">aaaaa</span>
<span style="display: none">invisible</span>
<span style="display: inline">zzzzz</span>
</div>
<div id="output"></p>
推荐答案
仅将其附加到用户真正可见的文档中即可.
Only appending it to a document literally visible to the user works.
但是用户不必一定要看到它. :-)如果添加它,请抓住innerText
,然后将其删除,用户将永远不会看到它:
But the user doesn't necessarily have to see that. :-) If you append it, grab innerText
, and then remove it, the user will never see it:
var div = [];
div[0] = document.getElementById("visible");
div[1] = div[0].cloneNode(true);
show(0);
document.body.appendChild(div[1]); // *****
show(1);
document.body.removeChild(div[1]); // *****
function show(i) {
document.getElementById("output").innerHTML +=
"<p>div[" + i + "].innerText === <code>" +
div[i].innerText.replace(/\n/g, "") + "</code></p>";
}
#visible {display: block; font-family: sans-serif; font-size: larger; color: red;}
code {background-color: lightgray; padding: 0 .318em;}
<div id="visible">
<span style="display: inline">aaaaa</span>
<span style="display: none">invisible</span>
<span style="display: inline">zzzzz</span>
</div>
<div id="output"></p>
或者,由于该元素不在DOM中,因此CSS不能使它不可见,而只能是内联样式.除了您的display: none
和visibility: hidden
(例如,opacity: 0
不会这样做)之外,我想不出其他任何会使文本被排除在innerText
外的内联样式,所以这很简单排除那些元素并标准化非pre
元素的空格:
Alternately, since the element isn't in the DOM, it can't be made invisible by CSS, only inline styles. I can't think of any other inline style that would make the text get left out of innerText
other than your display: none
and visibility: hidden
(opacity: 0
, for instance, doesn't do it), so it's trivial to exclude those and normalize whitespace for non-pre
elements:
function getInnerText(element) {
var node, text = "";
if (element.style.display.toLowerCase() !== "none" && element.style.visibility.toLowerCase() !== "hidden") {
for (node = element.firstChild; node; node = node.nextSibling) {
if (node.nodeType === 3) {
text += node.nodeValue;
} else if (node.nodeType === 1) {
text += getInnerText(node);
}
}
}
// Normalize all whitespace if not "pre"
if (element.tagName !== "PRE" && element.style.whiteSpace.toLowerCase().indexOf("pre") == -1) {
text = text.replace(/\s+/g, ' ');
}
return text;
}
这很可能需要进行调整(我认为它不能正确处理<div>stuff<pre>big gap</pre></div>
),但是如果您不想使用上面的第一个解决方案,则可以执行此操作...
That may well need tweaking (I don't think it handles <div>stuff<pre>big gap</pre></div>
properly), but you can run with the idea if you don't want to use the first solution above...
示例:
var div = [];
div[0] = document.getElementById("visible");
div[1] = div[0].cloneNode(true);
show(0);
document.body.appendChild(div[1]); // *****
show(1);
document.body.removeChild(div[1]); // *****
function show(i) {
document.getElementById("output").innerHTML +=
"<p>div[" + i + "].innerText === <code>" +
getInnerText(div[i]).replace(/\n/g, "") + "</code></p>";
}
function getInnerText(element) {
var node, text = "";
if (element.style.display.toLowerCase() !== "none" && element.style.visibility.toLowerCase() !== "hidden") {
for (node = element.firstChild; node; node = node.nextSibling) {
if (node.nodeType === 3) {
text += node.nodeValue;
} else if (node.nodeType === 1) {
text += getInnerText(node);
}
}
}
// Normalize all whitespace if not "pre"
if (element.tagName !== "PRE" && element.style.whiteSpace.toLowerCase().indexOf("pre") == -1) {
text = text.replace(/\s+/g, " ");
}
return text;
}
#visible {display: block; font-family: sans-serif; font-size: larger; color: red;}
code {background-color: lightgray; padding: 0 .318em;}
<div id="visible">
<span style="display: inline">aaaaa</span>
<span style="display: none">invisible</span>
<span style="display: inline">zzzzz</span>
</div>
<div id="output"></p>
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