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How to convert XHTML nested list to pdf using iText?

I have XHTML content and I have to create a PDF file from this content on the fly. I am using iText pdf converter. I've tried the easy way, but I always get bad results after calling the XMLWorkerHelper parser.

XHTML: <ul> <li>First <ol> <li>Second</li> <li>Second</li> </ol> </li> <li>First</li> </ul>

Expected value:           

  •              
  • The first                  
    •                           
    • Second                          
    • Second                
                              
  • The first          

Result in PDF format:

  • First second second
  • The first

As a result, there is no nested list. I need a solution to call the parser, not instantiate the iText document.

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2 answers


Please take a look at the NestedListHtml example

For this example, I take the list.html code snippet :

<ul>
  <li>First
    <ol>
      <li>Second</li>
      <li>Second</li>
    </ol>
  </li>
  <li>First</li>
</ul>

And I parse it into ElementList

:

// CSS
CSSResolver cssResolver =
    XMLWorkerHelper.getInstance().getDefaultCssResolver(true);

// HTML
HtmlPipelineContext htmlContext = new HtmlPipelineContext(null);
htmlContext.setTagFactory(Tags.getHtmlTagProcessorFactory());
htmlContext.autoBookmark(false);

// Pipelines
ElementList elements = new ElementList();
ElementHandlerPipeline end = new ElementHandlerPipeline(elements, null);
HtmlPipeline html = new HtmlPipeline(htmlContext, end);
CssResolverPipeline css = new CssResolverPipeline(cssResolver, html);

// XML Worker
XMLWorker worker = new XMLWorker(css, true);
XMLParser p = new XMLParser(worker);
p.parse(new FileInputStream(HTML));

Now I can add this list to Document

:

for (Element e : elements) {
    document.add(e);
}


Or I can list this list in Paragraph

:

Paragraph para = new Paragraph();
for (Element e : elements) {
    para.add(e);
}
document.add(para);

You will get the desired output as shown in nested_list.pdf

You cannot add nested lists to PdfPCell

or to ColumnText

. For example: this won't work:

PdfPTable table = new PdfPTable(2);
table.addCell("Nested lists don't work in a cell");
PdfPCell cell = new PdfPCell();
for (Element e : elements) {
    cell.addElement(e);
}
table.addCell(cell);
document.add(table);

This is due to a limitation in the classroom ColumnText

, which has been around for many years. We appreciated the problem and the only way to fix it would be to rewrite it completely ColumnText

. This is not an item on our current technical roadmap.

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Here's a workaround for nested ordered and unordered lists.

The rich text editor I am using sets the "ql-indent-1/2/2 /" class attribute for the li attributes, based on the attribute that adds the start and end ul / ol tags.



public String replaceIndentSubList(String htmlContent) {
    org.jsoup.nodes.Document document = Jsoup.parseBodyFragment(htmlContent);
    Elements element_UL = document.select("ul");
    Elements element_OL = document.select("ol");
    if (!element_UL.isEmpty()) {
        htmlContent = replaceIndents(htmlContent, element_UL, "ul");
    }
    if (!element_OL.isEmpty()) {
        htmlContent = replaceIndents(htmlContent, element_OL, "ol");
    }
    return htmlContent;
}


public String replaceIndents(String htmlContent, Elements element, String tagType) {
    String attributeKey = "class";
    String startingULTgas = "<" + tagType + ">";
    String endingULTags = "</" + tagType + ">";
    int lengthOfQLIndenet = new String("ql-indent-").length();
    HashMap<String, String> startingLiTagMap = new HashMap<String, String>();
    HashMap<String, String> lastLiTagMap = new HashMap<String, String>();
    Pattern regex = Pattern.compile("ql-indent-\\d");
    HashSet<String> hash_Set = new HashSet<String>();
    Elements element_Tag = element.select("li");
    for (org.jsoup.nodes.Element element2 : element_Tag) {
        org.jsoup.nodes.Attributes att = element2.attributes();
        if (att.hasKey(attributeKey)) {
            String attributeValue = att.get(attributeKey);
            Matcher matcher = regex.matcher(attributeValue);
            if (matcher.find()) {
                if (!startingLiTagMap.containsKey(attributeValue)) {
                    startingLiTagMap.put(attributeValue, element2.toString());
                }
                hash_Set.add(matcher.group(0));
                if (!startingLiTagMap.get(attributeValue)
                        .equalsIgnoreCase(element2.toString())) {
                    lastLiTagMap.put(attributeValue, element2.toString());
                }
            }
        }
    }
    System.out.println(htmlContent);
    Iterator value = hash_Set.iterator();
    while (value.hasNext()) {
        String liAttributeKey = (String) value.next();
        int noOfIndentes = Integer
                .parseInt(liAttributeKey.substring(lengthOfQLIndenet));
        if (noOfIndentes > 1)
            for (int i = 1; i < noOfIndentes; i++) {
                startingULTgas = startingULTgas + "<" + tagType + ">";
                endingULTags = endingULTags + "</" + tagType + ">";
            }
        htmlContent = htmlContent.replace(startingLiTagMap.get(liAttributeKey),
                startingULTgas + startingLiTagMap.get(liAttributeKey));
        if (lastLiTagMap.get(liAttributeKey) != null) {
            System.out.println("Inside last Li Map");
            htmlContent = htmlContent.replace(lastLiTagMap.get(liAttributeKey),
                    lastLiTagMap.get(liAttributeKey) + endingULTags);
        }
        else {
            htmlContent = htmlContent.replace(startingLiTagMap.get(liAttributeKey),
                    startingLiTagMap.get(liAttributeKey) + endingULTags);
        }
        startingULTgas = "<" + tagType + ">";
        endingULTags = "</" + tagType + ">";
    }
    System.out.println(htmlContent);[enter image description here][1]
    return htmlContent;
}
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