带有图像的 DIV 内的文本分页

本文介绍了带有图像的 DIV 内的文本分页的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我想在某个 div 中对文本进行分页，以便它适合允许的区域
逻辑很简单:
1. 将文本拆分成单词
2.逐字添加并计算元素高度
3.如果超出高度-创建下一页

I want to paginate a text in some div so it will fit the allowed area
Logic is pretty simple:
1. split text into words
2. add word by word into and calculate element height
3. if we exceed the height - create next page

效果很好

这是我使用过的 JS 函数:

here is JS function i've used:

function paginate() {
    var newPage = $('<pre class="text-page" />');
    contentBox.empty().append(newPage);
    var betterPageText='';
    var pageNum = 0;
    var isNewPage = false;

    var lineHeight = parseInt(contentBox.css('line-height'), 10);

    var wantedHeight = contentBox.height() - lineHeight;

    for (var i = 0; i < words.length; i++) {        
        if (isNewPage) {
            isNewPage = false;
        } else {            
            betterPageText = betterPageText + ' ' + words[i];
        }
        newPage.text(betterPageText + ' ...');
        if (newPage.height() >= wantedHeight) {
            pageNum++;
            if (pageNum > 0) {
                betterPageText = betterPageText + ' ...';
            }

            newPage.text(betterPageText);
            newPage.clone().insertBefore(newPage)            

            betterPageText = '...';
            isNewPage = true;
        } else {            
            newPage.text(betterPageText);
        }        
    }

    contentBox.craftyslide({ height: wantedHeight });
}

但是当我添加图像时，它会破坏一切.在这种情况下，文本会溢出绿色"区域.

But when i add an image it break everything. In this case text overflows 'green' area.

工作小提琴:http://jsfiddle/74W​​4N/7/

有没有更好的方法来分页文本和计算元素高度?

推荐答案

通过使用 jQuery.clone() 方法解决，并对原始 HTML 元素的隐藏副本执行所有计算

Solved by using jQuery.clone() method and performing all calculations on hidden copy of original HTML element

function paginate() {

     var section = $('.section');

     var cloneSection = section.clone().insertAfter(section).css({ position: 'absolute', left: -9999, width: section.width(), zIndex: -999 });

     cloneSection.css({ width: section.width() });

     var descBox = cloneSection.find('.holder-description').css({ height: 'auto' });

     var newPage = $('<pre class="text-page" />');
     contentBox.empty();
     descBox.empty();
     var betterPageText = '';
     var pageNum = 0;
     var isNewPage = false;

     var lineHeight = parseInt(contentBox.css('line-height'), 10);

     var wantedHeight = contentBox.height() - lineHeight;
     var oldText = '';

     for (var i = 0; i < words.length; i++) {
        if (isNewPage) {
           isNewPage = false;
           descBox.empty();
        }
        betterPageText = betterPageText + ' ' + words[i];

        oldText = betterPageText;

        descBox.text(betterPageText + ' ...');
        if (descBox.height() >= wantedHeight) {

           if (i != words.length - 1) {
              pageNum++;

              if (pageNum > 0) {
                 betterPageText = betterPageText + ' ...';
              }

              oldText += ' ... ';
           }

           newPage.text(oldText);
           newPage.clone().appendTo(contentBox);

           betterPageText = '... ';
           isNewPage = true;
        } else {
           descBox.text(betterPageText);
           if (i == words.length - 1) {
              newPage.text(betterPageText).appendTo(contentBox);
           }
        }
     }

     if (pageNum > 0) {
        contentBox.craftyslide({ height: wantedHeight });
     }

     cloneSection.remove();
}

现场演示:http://jsfiddle/74W​​4N/19/

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