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我需要在“复选框”选择模式下的primefaces树,但一次只能选择一个且只能选择一个节点。默认情况下,当选择节点时,primefaces树会选择所有的后代,而这实际上是我想要更改的。Primefaces树复选框单选
有人能帮我弄明白吗?
我需要在“复选框”选择模式下的primefaces树,但一次只能选择一个且只能选择一个节点。默认情况下,当选择节点时,primefaces树会选择所有的后代,而这实际上是我想要更改的。Primefaces树复选框单选
有人能帮我弄明白吗?
我终于找到了一种方法,通过查看Javascript source code of the tree来实现此目的。你可以例如创建一个缓存先前选择的节点的单例。通过使用树的“onNodeClick”属性,您可以调用一个Javascript函数,在小部件在内部设置新选定节点之前取消选择之前的节点(并且可能会在使用ajax事件时发布新选择)。
更新:
我修改了一个facelet和JavaScript来搜索树,在初始化预选节点。请注意,预选节点必须可见才能正常工作。有关扩展父节点的详细信息,请参阅this answer。
豆:
@Named
@ViewScoped
public class BackingBean implements Serializable {
private TreeNode rootTreeNode;
// IMPORTANT: Use array!
private TreeNode[] selected;
public TreeNode getRootTreeNode() {
if (rootTreeNode == null) {
rootTreeNode = new DefaultTreeNode("Root", null);
// init child tree nodes
}
return rootTreeNode;
}
public TreeNode[] getSelected() {
return selected;
}
public void setSelected(TreeNode[] selected) {
this.selected = selected;
}
}
的facelet:
<p:tree id="tree"
onNodeClick="TREE_SELECTION.updateSelection(node, event)"
propagateSelectionDown="false" propagateSelectionUp="false"
selection="#{backingBean.selected}" selectionMode="checkbox"
value="#{backingBean.rootTreeNode}"
var="data"
widgetVar="treeWidget">
<p:treeNode>
<h:outputText value="#{dataWrapper.label}" />
</p:treeNode>
</p:tree>
的Javascript:
<script type="text/javascript">
// singleton for tree selection
var TREE_SELECTION = {
init: function (treeWidgetVar) {
this.treeWidget = PF(treeWidgetVar);
this.selectedNode = this.treeWidget.jq.find('.ui-treenode-selected');
},
treeWidget: null,
selectedNode: null,
updateSelection: function (node, event) {
// get the checkbox state of the clicked node
var checkbox = node.find('> .ui-treenode-content > .ui-chkbox'),
checked = checkbox.find('> .ui-chkbox-box > .ui-chkbox-icon').hasClass('ui-icon-check');
if (checked) {
// checkbox is going to be unchecked
this.selectedNode = null;
return;
}
// check for previously selected node
if (this.selectedNode !== null) {
// get the checkbox of the previously selected node
checkbox = this.selectedNode.find('> .ui-treenode-content > .ui-chkbox');
// update tree
this.treeWidget.uncheck(checkbox);
this.treeWidget.removeFromSelection(this.treeWidget.getRowKey(this.selectedNode));
}
// cache selected node
this.selectedNode = node;
}
};
// initialize singleton when document is loaded
$(function() {
TREE_SELECTION.init('treeWidget');
});
</script>