如何使用Liferay和JavaScript为多个文件创建下载按钮?

时间:2017-10-18 15:05:46

标签: javascript liferay liferay-6 jszip

我在点击时尝试按下按钮,它会以zip文件的形式下载文件。我试图从给定的URL将文件加载到Zip中。 我正在使用Liferay 6.1。

JSP文件中的脚本声明是否正确?

我已经在liferay-portlet.xml中指定了jszip.js。

<footer-portlet-javascript>/js/jszip.js</footer-portlet-javascript>

我是否必须使用Liferay AUI Taglib标签或简单的javaScript标签才能完成工作?

<aui:script></aui:script><script type="text/javascript"></script>或liferay-portlet.xml

我的脚本是否正确下载多个文件?

<c:if test="<%= multi_files_urls != null && multi_files_urls.size() > 1 %>">
    <aui:button onClick="downloadFiles(<%= multi_files_urls %>)" value="Download files"></aui:button>
</c:if>

<script type="text/javascript">
 function downloadFiles(multi_files_urls) {
     for (var url in multi_files_urls )
        JSZipUtils.getBinaryContent(url, function(err, data) {
        if(err) {
            throw err;
        }
        JSZip.loadAsync(data).then(function () {
         var zip = new JSZip(data);
            });
        });

     zip.then(function(content) {
            saveAs(content, "my_documents.zip");
    });
}
</script>

我收到以下错误:

  

(index):1未捕获的ReferenceError:未定义zip       在downloadFiles((索引):1)       在HTMLInputElement.onclick((index):1)

更新

我尝试了<header-portlet-javascript>/js/jszip.js</header-portlet-javascript><script type="text/javascript" src="<%=request.getContextPath()%>/js/jszip.js"></script>,但它没有用。

我点了这个链接:Unable to include css and JS files in Liferay Portlet JSP Page

2 个答案:

答案 0 :(得分:0)

我没有检查,但看起来这完全独立于Liferay以及您如何嵌入代码:错误消息显示zip is not definedzip被定义的唯一位置是在此函数中,它立即超出范围:

 JSZip.loadAsync(data).then(function () {
    var zip = new JSZip(data);
 });

因此,当代码运行时,它不在范围内:

 zip.then(function(content) {
    saveAs(content, "my_documents.zip");
 });

你必须进一步声明 zip,以便当你想要使用它时它仍然在范围内(但是,很可能,初始化它你当前的位置初始化)。由于我没有使用JSZip库和使用async关键字的经验,我不确定是否只需重新排序,或者如果时间仅在其预期用途之后初始化zip - 我会留下这个由你决定。

尝试在单个HTML页面中进行复制,因为我没有看到Liferay会给游戏带来的复杂性是导致问题的原因。这可能会使其更容易理解。当它运行时,将其嵌入Liferay。

答案 1 :(得分:0)

更新(解决方案)

1-我将js文件添加到liferay-portlet.xml文件中。

    <footer-portlet-javascript>/js/jquery-1.8.3.min.js</footer-portlet-javascript>
    <footer-portlet-javascript>/js/jszip.js</footer-portlet-javascript>
    <footer-portlet-javascript>/js/jszip-utils.js</footer-portlet-javascript>
    <footer-portlet-javascript>/js/FileSaver.js</footer-portlet-javascript>
    <footer-portlet-javascript>/js/downloader.js</footer-portlet-javascript>
    <footer-portlet-javascript>/js/helpers.js</footer-portlet-javascript>

2-在我的视图中.jsp

<form action="#" id="download_form">
                <% 
                    PortletURL actionURL = renderResponse.createRenderURL(); 
                    List<DLFileEntry> list = (List<DLFileEntry>) request.getAttribute("listFiles");
                    DateFormat dateFormat = new SimpleDateFormat("MMM yyyy");

                    OrderByComparator orderByComparator = OrderByComparatorFactoryUtil.create("DLFileEntry", "modifiedDate", false);
                    Collections.sort(list,orderByComparator);
                %>

                <p class="hide" id="result"></p>
                <aui:button id="download_files" type="submit" value="Download files"></aui:button>

                <liferay-ui:search-container iteratorURL="<%= actionURL %>"
                    delta="10" emptyResultsMessage="no-documents">
                    <liferay-ui:search-container-results total="<%= list.size() %>"
                        results="<%= ListUtil.subList(list, searchContainer.getStart(), searchContainer.getEnd()) %>" />
                    <liferay-ui:search-container-row modelVar="file"
                        className="DLFileEntry">
                        <%
                            ThemeDisplay themeDisplay = (ThemeDisplay) request.getAttribute(WebKeys.THEME_DISPLAY);
                            String pdfUrl = "", excelUrl = "";
                            String logo ="", vendor="", technology="", productType="", flashType="";

                            long globalGroupId = GroupLocalServiceUtil.getCompanyGroup(PortalUtil.getDefaultCompanyId()).getGroupId();

                            if(file.getExtension().equalsIgnoreCase("pdf"))
                                pdfUrl = "<a target='_blank' href='"+ themeDisplay.getPortalURL() + themeDisplay.getPathContext() + "/documents/" + globalGroupId + StringPool.SLASH + file.getUuid()+"' ><img src='/flash-table-portlet/images/pdf.png' width='20px'/> </a>";
                            else if(file.getExtension().equalsIgnoreCase("xlsx") || file.getExtension().equalsIgnoreCase("xls") || file.getExtension().equalsIgnoreCase("csv") )
                                excelUrl = "<a target='_blank' href='"+ themeDisplay.getPortalURL() + themeDisplay.getPathContext() + "/documents/" + globalGroupId + StringPool.SLASH + file.getUuid()+"' ><img src='/flash-table-portlet/images/excel.png' width='20px'/> </a>";

                            try{
                                Map<String, Fields> fieldsMap = file.getFieldsMap(file.getFileVersion().getFileVersionId());
                                for (Fields fields : fieldsMap.values()) {
                                    vendor =  fields.get("vendor").getValue().toString().replace("[\"", "").replace("\"]", "");
                                    if(vendor.equalsIgnoreCase("other"))
                                        logo="<strong>other</strong>";
                                    else
                                        logo = "<img src='/flash-table-portlet/images/vendor/"+vendor.toLowerCase()+".gif' style='max-width:120px' />";
                                    technology= fields.get("technology").getValue().toString().replace("[\"", "").replace("\"]", "");
                                    productType =  fields.get("producttype").getValue().toString().replace("[\"", "").replace("\"]", "");
                                    flashType =  fields.get("flashtype").getValue().toString().replace("[\"", "").replace("\"]", "");
                                }
                            }catch(Exception ex){
                                ex.printStackTrace();
                            }
                        %>

                        <%! String file_name = ""; %>

                        <%
                            String fileUrl = themeDisplay.getPortalURL() + themeDisplay.getPathContext() + "/documents/" + globalGroupId + StringPool.SLASH + file.getUuid();
                            file_name = file.getTitle() + "." + file.getExtension();
                         %>

                        <liferay-ui:search-container-column-text name="Checkbox">
                            <input type="checkbox" data-url="<%= fileUrl %>"
                                name="<%= file_name %>" />
                        </liferay-ui:search-container-column-text>
                        <liferay-ui:search-container-column-text name='date'
                            cssClass="txt-capitalize width-10"
                            value="<%= dateFormat.format(file.getModifiedDate()) %>" />
                        <liferay-ui:search-container-column-text name='vendor'
                            cssClass="width-10" value="<%= logo %>" />
                        <liferay-ui:search-container-column-text name='technology'
                            cssClass="width-10" value="<%= technology %>" />
                        <liferay-ui:search-container-column-text name='product-type'
                            cssClass="width-12" value="<%= productType %>" />
                        <liferay-ui:search-container-column-text name='flash-type'
                            cssClass="width-12" value="<%= flashType %>" />
                        <liferay-ui:search-container-column-text name='model'
                            cssClass="width-25" value="<%= file.getTitle() %>" />
                        <liferay-ui:search-container-column-text name='executive-summary'
                            cssClass="width-10" value="<%= pdfUrl %>" />
                        <liferay-ui:search-container-column-text name='excel-file'
                            cssClass="width-10" value="<%= excelUrl %>" />
                    </liferay-ui:search-container-row>
                    <liferay-ui:search-iterator
                        searchContainer="<%= searchContainer %>"
                        paginate="${fn:length(listFiles) ge 10}" />
                </liferay-ui:search-container>
            </form>

一切顺利!