我的问题非常类似于“
Trim text to 340 chars”，但在jQuery中。听起来很直接，但是当我搜索时，我找不到任何参考。
好的，我有一个div $(‘#content’)我想剪裁文本到’x’的字符数字让我们说’600’，但我不希望它打破自己的话！喜欢不是’的Ques …’但是问题…’。
文字的其余部分会发生什么？嗯，我隐藏它，并将要求显示！但是请等待，它应该首先删除“…”，并在其隐藏之后显示文本。
以下是$(‘#content’)的示例结构：
<div id="content">
<p>Once upon a midnight dreary,while I pondered weak and weary,Over many a quaint and curIoUs volume of forgotten lore.</p>
<p>Writing example text is very boring.</p>
<p>Specially when you are dumb enough not to copy and paste. Oh!</p>
<p>Once it sheltered the rogues and rapscallions of the British Empire; Now Kangaroo Island is ready and waiting for some derring-do of your own. Venture into the rugged wilds of the island,traversing untamed bushland and pristine beaches seeking out seal,penguin and sea lion colonies. Meet the land loving locals - koalas,goannas,echidnas and the island's own species of kangaroo. </p>
</div>
如何加载：
Once upon a midnight dreary,while I
pondered weak and weary,Over many a
quaint and curIoUs volume of forgotten
lore.Writing example text is… [Read
More]
点击“阅读更多”后：
Once upon a midnight dreary,Over many a
quaint and curIoUs volume of forgotten
lore.Writing example text is very boring.
Specially when you are dumb enough not
to copy and paste. Oh!Once it sheltered the rogues and
rapscallions of the British Empire;
Now Kangaroo Island is ready and
waiting for some derring-do of your
own. Venture into the rugged wilds of
the island,traversing untamed
bushland and pristine beaches seeking
out seal,penguin and sea lion
colonies. Meet the land loving locals
– koalas,echidnas and the island’s own species of kangaroo.
解决方法
该代码假设标签将始终保持平衡，而没有更近的标签将是< br /> (尽管如果需要，这可以很容易地补救)。
#content {
width: 800px;
clear:both;
clip:auto;
overflow: hidden;
}
.revealText {
background: white; /* Strange problem in ie8 where the sliding animation goes too far
if revealText doesn't have a background color! */
}
.hiddenText {
}
.readMore {
cursor: pointer;
color: blue;
}
.ellipsis {
color: black;
}
$('document').ready(function() {
truncate('#content');
$('.readMore').live('click',function() {
var $hidden = $('.hiddenText');
if($hidden.is(':hidden')) {
$hidden.show();
$(this).insertAfter($('#content')).children('.readMoreText').text(' [Read Less] ').siblings().hide();
} else {
$(this).appendTo($('.revealText')).children('.readMoreText').text(' [Read More] ').siblings().show();
$hidden.hide();
}
});
$('.readMore').click();
function truncate(element) {
$(element + ' p').css({display: 'inline'});
var theText = $(element).html(); // Original Text
var item; // Current tag or text area being iterated
var convertedText = '<span class="revealText">'; // String that will represent the finished result
var limit = 154; // Max characters (though last word is retained in full)
var counter = 0; // Track how far we've come (compared to limit)
var lastTag; // Hold a reference to the last opening tag
var lastOpenTags = []; // Stores an array of all opening tags (they get removed as tags are closed)
var NowHiding = false; // Flag to set to show that we're Now in the hiding phase
theText = theText.replace(/[\s\n\r]{2,}/g,' '); // Consolidate multiple white-space characters down to one. (Otherwise the counter will count each of them.)
theText = theText.replace(/(<[^<>]+>)/g,'|*|SPLITTER|*|$1|*|SPLITTER|*|'); // Find all tags,and add a splitter to either side of them.
theText = theText.replace(/(\|\*\|SPLITTER\|\*\|)(\s*)\|\*\|SPLITTER\|\*\|/g,'$1$2'); // Find consecutive splitters,and replace with one only.
theText = theText.replace(/^[\s\t\r]*\|\*\|SPLITTER\|\*\||\|\*\|SPLITTER\|\*\|[\s\t\r]*$/g,''); // Get rid of unnecessary splitter (if any) at beginning and end.
theText = theText.split(/\|\*\|SPLITTER\|\*\|/); // Split theText where there's a splitter. Now we have an array of tags and words.
for(var i in theText) { // Iterate over the array of tags and words.
item = theText[i]; // Store current iteration in a variable (for convenience)
lastTag = lastOpenTags[lastOpenTags.length - 1]; // Store last opening tag in a variable (for convenience)
if( !item.match(/<[^<>]+>/) ) { // If 'item' is not a tag,we have text
if(lastTag && item.charat(0) == ' ' && !lastTag[1].match(/span|SPAN/)) item = item.substr(1); // Remove space from beginning of block elements (like IE does) to make results match cross browser
if(!NowHiding) { // If we haven't started hiding yet...
counter += item.length; // Add length of text to counter.
if(counter >= limit) { // If we're past the limit...
var length = item.length - 1; // Store the current item's length (minus one).
var position = (length) - (counter - limit); // Get the position in the text where the limit landed.
while(position != length) { // As long as we haven't reached the end of the text...
if( !!item.charat(position).match(/[\s\t\n]/) || position == length ) // Check if we have a space,or are at the end.
break; // If so,break out of loop.
else position++; // Otherwise,increment position.
}
if(position != length) position--;
var closeTag = '',openTag = ''; // Initialize open and close tag for last tag.
if(lastTag) { // If there was a last tag,closeTag = '</' + lastTag[1] + '>'; // set the close tag to whatever the last tag was,openTag = '<' + lastTag[1] + lastTag[2] + '>'; // and the open tag too.
}
// Create transition from revealed to hidden with the appropriate tags,and add it to our result string
var transition = '<span class="readMore"><span class="ellipsis">...</span><span class="readMoreText"> [Read More] </span></span>' + closeTag + '</span><span class="hiddenText">' + openTag;
convertedText += (position == length) ? (item).substr(0) + transition
: (item).substr(0,position + 1) + transition + (item).substr(position + 1).replace(/^\s/,' ');
NowHiding = true; // Now we're hiding.
continue; // Break out of this iteration.
}
}
} else { // Item wasn't text. It was a tag.
if(!item.match(/<br>|<BR>/)) { // If it is a <br /> tag,ignore it.
if(!item.match(/\//)) { // If it is not a closing tag...
lastOpenTags.push(item.match(/<(\w+)(\s*[^>]*)>/)); // Store it as the most recent open tag we've found.
} else { // If it is a closing tag.
if(item.match(/<\/(\w+)>/)[1] == lastOpenTags[lastOpenTags.length - 1][1]) { // If the closing tag is a paired match with the last opening tag...
lastOpenTags.pop(); // ...remove the last opening tag.
}
if(item.match(/<\/[pP]>/)) { // Check if it is a closing </p> tag
convertedText += ('<span class="paragraphBreak"><br> <br> </span>'); // If so,add two line breaks to form paragraph
}
}
}
}
convertedText += (item); // Add the item to the result string.
}
convertedText += ('</span>'); // After iterating over all tags and text,close the hiddenText tag.
$(element).html(convertedText); // Update the container with the result.
}
});
<div id="content">
<p>Once upon a midnight dreary,echidnas and the island's own species of kangaroo. </p>
</div>
原文地址：https://www.jb51.cc/jquery/182940.html
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