本文介绍了bean中的方法，用于检查Primefaces数据表中的行是否仍在编辑中的处理方法，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
在基于JSF和Primefaces的Java应用程序中，我有一个表，用户可以在其中动态添加行以添加注释。
In a JSF and Primefaces based Java application, I have a table, where the user can dynamically add rows so as to add comments.
这是带有注释的表的代码。可以通过按按钮添加评论。按下按钮将在表格顶部添加注释。
如果用户按下复选图标将输入的文本保存到新行，则一切正常。但是，当保存整个页面（不包括代码）时，将仅保存作者和日期字段。所有输入的文本都会丢失。
Here is the code for a table with comments. Comments can be added by pressing a button. Pressing the button will add a comment to the top of the table.Everything works fine if the user presses the check icon to save the text entered into a new row. However, when saving the whole page (code not included), only the author and date fields will be saved. Any entered text is lost.
我正在尝试寻找一种方法，以查明是否仍在编辑Primefaces数据表中的一行，以便保存，或向用户显示警告。
I am trying to find a way to find out, whether a row in a Primefaces datatable is still being edited, so as to either save it, or show a warning to the user.
这是xhtml：
<div class="ui-g-6 no-vertical-padding">
<f:event type="preRenderView" listener="#{commentController.initPage()}"/>
<h:form id="CommentsForm">
<p:commandButton style="width: 1px; height: 1px; position: fixed; top: -1000px;"
action="#{mainController.save}" styleClass="cleanDirtyButton"/>
<p:fieldset legend="Comments" style="height: 309px">
<p:remoteCommand name="onCellEdit" update="commentTable" partialSubmit="true"
ignoreAutoUpdate="true"/>
<!--<h:inputHidden id="hiddenSizeId" value="#{commentForm.itemsSize}"/>-->
<!--<h:inputHidden id="hiddenIxId" value="#{commentForm.newItemIx}"/>-->
<!-- workarround -->
<h:inputHidden id="hiddenSizeId" value="1000000"/>
<h:inputHidden id="hiddenIxId" value="999999"/>
<script type="text/JavaScript">
function getNewItemPos() {
var noOfItems = $("#CommentsForm\\:hiddenSizeId").val();
var itemIx = $("#CommentsForm\\:hiddenIxId").val();
var bucketHt = $("#CommentsForm\\:commentTable .ui-datatable-scrollable-body").height();
var scrollHt = $("#CommentsForm\\:commentTable .ui-datatable-scrollable-body").prop("scrollHeight");
var itemHt = parseInt(scrollHt) / parseInt(noOfItems);
var noItemsInBucket = parseInt(bucketHt) / parseFloat(itemHt);
var itemNo = parseInt(itemIx) + 1;
var targetBucket = parseInt(itemNo) / parseFloat(noItemsInBucket);
var halfBucketHt = parseInt(bucketHt) / 2;
var scrollPos =
(parseInt(bucketHt) * (parseFloat(targetBucket) - 1)) + parseFloat(halfBucketHt);
var scrollPosInt = Math.round(parseFloat(scrollPos));
$('#CommentsForm\\:commentTable .ui-datatable-scrollable-body').animate({scrollTop: scrollPosInt});
}
function setCellFocus() {
$('.focus_comment:visible').delay().focus();
}
function cellEdit() {
setTimeout(setCellFocus, 1500);
$('.editTable .ui-datatable-data tr').last().find('span.ui-icon-pencil').each(function () {
jQuery(this).click()
});
}
</script>
<p:dataTable id="commentTable"
widgetVar="commentTableWidget"
value="#{projectForm.project.Comments}"
sortOrder="DESCENDING"
sortBy="#{comment.changedOn}"
var="comment"
editable="true"
rowIndexVar="rowIndex"
resizableColumns="true"
scrollable="true"
scrollRows="10"
liveScroll="true"
scrollHeight="212"
style="margin-top: 5px;"
emptyMessage="No comment found"
styleClass="ui-corner-all plus-button editTable noBackground">
<f:facet name="footer">
<p:commandButton id="addlink"
action="#{commentController.addComment()}"
oncomplete="getNewItemPos();cellEdit();setCellFocus();"
disabled="#{commentForm.editMode or !pR.hasPermission('PROJECTS:write')}"
process="@this"
partialSubmit="true"
update="commentTable"
value="Add Comment"
styleClass="table-plus-button"
icon="fa fa-plus" iconPos="right">
<p:ajax update=":CommentsForm:commentTable :CommentsForm:hiddenIxId :CommentsForm:hiddenSizeId"/>
</p:commandButton>
</f:facet>
<p:ajax event="rowEdit" listener="#{commentController.onRowEdit}"
update="commentTable"
oncomplete="if (args && !args.validationFailed) {onCellEdit();} else {$('.editTable tbody.ui-datatable-data tr td .deleteButton').hide();}"/>
<p:ajax event="rowEditCancel" listener="#{commentController.onRowCancel}"
onsuccess="onCellEdit();" update="commentTable"/>
<p:ajax event="rowEditInit" listener="#{commentForm.setEditMode(true)}"
update="addlink"
onstart="$('.editTable tbody.ui-datatable-data tr td .ui-icon-pencil').hide();$('.editTable tbody.ui-datatable-data tr td .deleteButton').hide();"/>
<p:column width="18%" headerText="date" sortBy="#{comment.changedOn}"
styleClass="align-top"
sortOrder="DESCENDING">
<h:outputText value="#{comment.changedOn eq null ?
(comment.createdOn eq null ? '': comment.createdOn ) : comment.changedOn}">
<f:convertDateTime type="date" pattern="dd.MM.yyyy" timeZone="CET"/>
</h:outputText>
</p:column>
<p:column width="30%" headerText="Text">
<p:cellEditor>
<f:facet name="output">
<span style="width: 100%; height: 100%">
<h:outputText escape="true" style="white-space:pre-line;"
id="commentDisplay"
value="#{comment.text.length() > 200 ? comment.text.substring(0, 200).concat(' ...'): comment.text}">
</h:outputText>
<p:tooltip id="commentDisplayToolTip"
for="commentDisplay,commentDisplayToolTipTxt"
rendered="#{comment.text.length() gt 200}"
beforeShow="$('.ui-tooltip:visible').hide()"
myPosition="left bottom" atPosition="right bottom"
hideDelay="500">
<p:outputLabel id="commentDisplayToolTipTxt"
styleClass="scrollOutputLabel"
value="#{comment.text}"/>
</p:tooltip>
</span>
</f:facet>
<f:facet name="input">
<p:message for="text" id="nameMsg"/>
<p:inputTextarea value="#{comment.text}" id="text"
onkeypress="setConfirmUnload(true); if ((($.browser.mozilla && event.ctrlKey && event.keyCode==13) ||(($.browser.msie||$.browser.chrome) && event.ctrlKey))
&& ( ! (event.altKey && event.ctrlKey) ) )
{$('.editTable tbody.ui-datatable-data tr td .ui-icon-check:visible').click(); $('#buttonForm\\:speichern').addClass('unsaved'); setConfirmUnload(true); }"
title="Text"
styleClass="Wid90 input_mandatory focus_comment">
</p:inputTextarea>
</f:facet>
</p:cellEditor>
</p:column>
<p:column width="30%" headerText="author" sortBy="#{comment.changedBy}"
styleClass="align-top"
sortOrder="DESCENDING">
<h:outputText
value="#{comment.changedBy eq null ?
( comment.createdBy eq null ? '' : commentController.extractUserData(comment.createdBy))
:commentController.extractUserData(comment.changedBy)}"/>
</p:column>
<p:column width="83" id="editor" styleClass="NoPadding align-top">
<p:rowEditor/>
<h:panelGroup id="deleteSpan">
<p:commandButton id="delete" partialSubmit="true"
style="height: 41px;"
title="Löschen"
action="#{commentController.removeComment(comment)}"
update="commentTable"
process="@this commentTable"
immediate="true"
icon="fa fa-close"
iconPos="center"
styleClass="deleteButton Fright"
disabled="#{empty commentForm.project.Comments}">
<p:confirm header="Confirmation" message="Delete Comment?"
icon="ui-icon-alert"/>
</p:commandButton>
</h:panelGroup>
</p:column>
</p:dataTable>
</p:fieldset>
</h:form>
</div>
这是控制者：
@Named("commentController")
@RequestScoped
public class CommentController {
// this method is executed when pressing the add-comment button:
public void addComment() {
Comment comment = new Comment();
commentForm.setComment(comment);
final DataTable commentTable = (DataTable) FacesContext.getCurrentInstance().getViewRoot().findComponent("commentsForm:commentTable");
if (commentTable != null) {
commentTable.setValueExpression("sortBy", null);
commentTable.setValueExpression("sortOrder", null);
}
comment.setProject(projectForm.getProject);
projectForm.getProject().getComments().add(comment);
if (commentTable) {
commentTable.processValidators(getFacesContext());
}
}
// not really relevant for my question, because:
// this method is only called when properly ending the rowEdit by pressing the green check
public void onRowEdit(RowEditEvent event) {
Comment comment = (Comment) event.getObject();
if (!validateComment(comment)) {
getFacesContext().validationFailed();
} else {
if (comment.getId() != 0 && commentForm.getProject().getComments().contains(comment)) {
projectForm.getProject().getComments().set(commentForm.getProject().getComments().indexOf(comment), comment);
}
commentForm.setEditMode(false);
}
}
}
推荐答案
我能够通过添加
<p:ajax update="commentTable"/>
到
<p:inputTextarea...>
找到此信息后：
这篇关于bean中的方法，用于检查Primefaces数据表中的行是否仍在编辑中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！