我是extjs
的新手,我使用过树形面板。我写了一些代码,用于选中和取消选中树控件的复选框。我有像下面这样的树的结构。
|-Parent 1
|- Child 1
|- Child 2
|- Sub child 2.1
|- Sub child 2.2
|- Child 3
|- Child 4
|- Sub child 4.1
|- Sub child 4.2
|- Child 5
|- Child 6
|-Parent 2
|- Child 1
|- Child 2
|- Sub child 2.1
|- Child 3
在listener中,我编写了检查和取消检查节点的代码,假设所有节点都被选中,用户取消选中Sub child 2.3
,那么Child 2
和Parent 1
都会被取消检查,这是正常工作的。
现在的问题是,每当这个check/uncheck事件发生时,它都会触发一个DB调用。我想让它像一次一样,让它完成所有的check/uncheck操作,然后单次调用db,而不是每次都调用。我很困惑,怎么才能做到这一点?下面是相同的代码。
items: [
Ext.create('Ext.tree.Panel', {
checkPropagation: 'both',
itemId: 'datasourceCustodianTree',
rootVisible: false,
store: {
fields: ['value'],
root: {
expanded: true,
children: treeData,
text: 'Source:',
}
},
listeners: {
checkchange: function (node, checked, options) {
var list1 = [], list2 = [], list3 = [];
var tree = me.down('#datasourceTree');
// Propagate change downwards (for all children of current node).
var setChildrenCheckedStatus = function (current) {
if (current.parentNode) {
var parent = current.parentNode;
current.set('checked', parent.get('checked'));
suspendEvent = true;
}
if (current.hasChildNodes()) {
current.eachChild(arguments.callee);
}
};
if (node.hasChildNodes()) {
node.eachChild(setChildrenCheckedStatus);
}
// Propagate change upwards (if all siblings are the same, update parent).
var updateParentCheckedStatus = function (current) {
if (current.parentNode) {
var parent = current.parentNode;
var checkedCount = 0;
parent.eachChild(function (n) {
checkedCount += (n.get('checked') ? 1 : 0);
});
// Children have same value if all of them are checked or none is checked.
var sameValue = (checkedCount == parent.childNodes.length) || (checkedCount == 0);
if (sameValue) {
var checkedValue = (checkedCount == parent.childNodes.length);
parent.set('checked', checkedValue);
suspendEvent = true;
} else {
// Not all of the children are checked, so uncheck the parent.
parent.set('checked', false);
suspendEvent = false;
}
updateParentCheckedStatus(parent);
}
}
updateParentCheckedStatus(node);
this.getChecked().forEach(function (item) {
if (item.data.parentId !== "root" && item.isLeaf()) {
if (item.data.listFor.toLowerCase() === 'item1') {
list1.push(item.data.value);
} else if (item.data.listFor.toLowerCase() === 'item2') {
list2.push(item.data.value);
} else if (item.data.listFor.toLowerCase() === 'item3') {
list3.push(item.data.value);
}
}
});
// DB Call to get data on any checkchange event.
me.updateData(list1, list2, list3);
}
}
})
]
如何避免这样的操作?我试着让它成为resumeEvent('checkchange')
之后的suspendEvent('checkchange');
。但这并不起作用,因为它只会调用此事件一次。
现在我不知所措,该怎么办?
https://stackoverflow.com/questions/56424249
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