我在 React 中有一个由 jQuery UI 提供支持的可排序列表。当我拖放列表中的项目时,我想更新数组,以便将列表的新顺序存储在那里。然后使用更新后的数组重新渲染页面。即 this.setState({data: _todoList});
目前,当您拖放某个项目时,jQuery UI DnD 可以工作,但该项目在 UI 中的位置不会改变,即使页面使用更新后的数组重新呈现也是如此。即在 UI 中,即使定义其位置的数组已成功更新,该项目也会恢复到其原来在列表中的位置。
如果您拖放该项目两次,它就会移动到正确的位置。
// Enable jQuery UI Sortable functionality
$(function() {
$('.bank-entries').sortable({
axis: "y",
containment: "parent",
tolerance: "pointer",
revert: 150,
start: function (event, ui) {
ui.item.indexAtStart = ui.item.index();
},
stop: function (event, ui) {
var data = {
indexStart: ui.item.indexAtStart,
indexStop: ui.item.index(),
accountType: "bank"
};
AppActions.sortIndexes(data);
},
});
});
// This is the array that holds the positions of the list items
var _todoItems = {bank: []};
var AppStore = assign({}, EventEmitter.prototype, {
getTodoItems: function() {
return _todoItems;
},
emitChange: function(change) {
this.emit(change);
},
addChangeListener: function(callback) {
this.on(AppConstants.CHANGE_EVENT, callback);
},
sortTodo: function(todo) {
// Dynamically choose which Account to target
targetClass = '.' + todo.accountType + '-entries';
// Define the account type
var accountType = todo.accountType;
// Loop through the list in the UI and update the arrayIndexes
// of items that have been dragged and dropped to a new location
// newIndex is 0-based, but arrayIndex isn't, hence the crazy math
$(targetClass).children('form').each(function(newIndex) {
var arrayIndex = Number($(this).attr('data-array-index'));
if (newIndex + 1 !== arrayIndex) {
// Update the arrayIndex of the element
_todoItems[accountType][arrayIndex-1].accountData.arrayIndex = newIndex + 1;
}
});
// Sort the array so that updated array items move to their correct positions
_todoItems[accountType].sort(function(a, b){
if (a.accountData.arrayIndex > b.accountData.arrayIndex) {
return 1;
}
if (a.accountData.arrayIndex < b.accountData.arrayIndex) {
return -1;
}
// a must be equal to b
return 0;
});
// Fire an event that re-renders the UI with the new array
AppStore.emitChange(AppConstants.CHANGE_EVENT);
},
}
function getAccounts() {
return { data: AppStore.getTodoItems() }
}
var Account = React.createClass({
getInitialState: function(){
return getAccounts();
},
componentWillMount: function(){
AppStore.addChangeListener(this._onChange);
// Fires action that triggers the initial load
AppActions.loadComponentData();
},
_onChange: function() {
console.log('change event fired');
this.setState(getAccounts());
},
render: function(){
return (
<div className="component-wrapper">
<Bank data={this.state.data} />
</div>
)
}
});
最佳答案
技巧是在 Sortable 的 stop
事件中调用 sortable('cancel')
,然后让 React 更新 DOM。
componentDidMount() {
this.domItems = jQuery(React.findDOMNode(this.refs["items"]))
this.domItems.sortable({
stop: (event, ui) => {
// get the array of new index (http://api.jqueryui.com/sortable/#method-toArray)
const reorderedIndexes = this.domItems.sortable('toArray', {attribute: 'data-sortable'})
// cancel the sort so the DOM is untouched
this.domItems.sortable('cancel')
// Update the store and let React update (here, using Flux)
Actions.updateItems(Immutable.List(reorderedIndexes.map( idx => this.state.items.get(Number(idx)))))
}
})
}
关于jquery-ui - jQuery UI 可使用 React.js 进行排序,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29725136/