【自定义编辑器系列】FlexGrid中如何使用dropdowntree组件

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我们知道，在FlexGrid中默认双击单元格时，只有普通的输入框可供用户键盘输入内容，
能否把功能丰富的Input组件引入到FlexGrid中呢？答案是肯定的，这个示例告诉我们没什么不可能：
https://demo.grapecity.com.cn/wijmo/demos/Grid/CustomCells/CustomEditors/purejs

自定义编辑器，实际上就是利用了FlexGrid的beginningEdit等事件，替换掉原生的input元素，
引入自定义的元素来实现原生input所不具备的功能。示例中演示了数字、下拉、日期三种input组件，
但实际应用中，我们的数据类型可能是多种多样的，比如今天讲到的，DropdownTree组件，如图：

想在FlexGrid中加入这个组件，面临的第一个问题是，WijmoJS本身并没有这个组件的实现，不过没关系，
关于这个问题，我直接给出解决方案，大家可以直接下载附件的“DropDownTree.js”，这个js文件扩展了wijmo的功能，
实现了这个功能，大家可以直接引用到项目中即可，如下：

new wijmo.input.DropDownTree()

复制代码

好了，有了这个组件，第二步就是把它集成到FlexGrid中。我们利用“自定义编辑器”这个示例的基本结构，
通过一些修改，来实现集成DropDownTree的功能，如下：

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<link href="css/wijmo.min.css" rel="stylesheet" />
<script src="js/wijmo.min.js"></script>
<script src="js/wijmo.nav.min.js"></script>
<script src="js/wijmo.grid.min.js"></script>
<script src="js/wijmo.grid.filter.min.js"></script>
<script src="js/wijmo.input.min.js"></script>
<script src="js/wijmo.culture.zh.min.js"></script>
<script src="js/DropDownTree.js"></script>
<style>
body {
margin-bottom: 24px;
}
.wj-flexgrid {
max-height: 300px;
}
</style>
</head>
<body>
<div class="container-fluid">
<div id="theGrid">
</div>
</div>
<script>
class CustomGridEditor {
/**
* Initializes a new instance of a CustomGridEditor.
*/
constructor(flex,binding, edtClass, options) {
// console.log(binding, edtClass, options)
// save references
this._grid = flex;
// this._col = flex.columns.getColumn(binding);
this._col = flex.rows[binding];
this._binding = flex.columns[binding];
console.log( flex.rows )
console.log( this._col )
// create editor
this._ctl = new edtClass(document.createElement('div'), options);
// connect grid events
flex.beginningEdit.addHandler(this._beginningEdit, this);
flex.sortingColumn.addHandler(() => {
this._commitRowEdits();
});
flex.scrollPositionChanged.addHandler(() => {
if (this._ctl.containsFocus()) {
flex.focus();
}
});
flex.selectionChanging.addHandler((s, e) => {
if (e.row != s.selection.row) {
this._commitRowEdits();
}
});
// connect editor events
this._ctl.addEventListener(this._ctl.hostElement, 'keydown', (e) => {
switch (e.keyCode) {
case wijmo.Key.Tab:
case wijmo.Key.Enter:
e.preventDefault(); // TFS 255685
this._closeEditor(true);
this._grid.focus();
// forward event to the grid so it will move the selection
var evt = document.createEvent('HTMLEvents');
evt.initEvent('keydown', true, true);
'altKey,metaKey,ctrlKey,shiftKey,keyCode'.split(',').forEach((prop) => {
evt[prop] = e[prop];
});
this._grid.hostElement.dispatchEvent(evt);
break;
case wijmo.Key.Escape:
this._closeEditor(false);
this._grid.focus();
break;
}
});
// close the editor when it loses focus
this._ctl.lostFocus.addHandler(() => {
setTimeout(() => {
if (!this._ctl.containsFocus()) {
this._closeEditor(true); // apply edits and close editor
this._grid.onLostFocus(); // commit item edits if the grid lost focus
}
});
});
// commit edits when grid loses focus
this._grid.lostFocus.addHandler(() => {
setTimeout(() => {
if (!this._grid.containsFocus() && !CustomGridEditor._isEditing) {
this._commitRowEdits();
}
});
});
// open drop-down on f4/alt-down
this._grid.addEventListener(this._grid.hostElement, 'keydown', (e) => {
// open drop-down on f4/alt-down
this._openDropDown = false;
if (e.keyCode == wijmo.Key.F4 ||
(e.altKey && (e.keyCode == wijmo.Key.Down || e.keyCode == wijmo.Key.Up))) {
var colIndex = this._grid.selection.col;
console.log( this._grid.selection.col)
if (colIndex > -1 && this._grid.rows[colIndex] == this._col) {
this._openDropDown = true;
this._grid.startEditing(true);
e.preventDefault();
}
}
// commit edits on Enter (in case we're at the last row, TFS 268944)
if (e.keyCode == wijmo.Key.Enter) {
this._commitRowEdits();
}
}, true);
// close editor when user resizes the window
// REVIEW: hides editor when soft keyboard pops up (TFS 326875)
window.addEventListener('resize', () => {
if (this._ctl.containsFocus()) {
this._closeEditor(true);
this._grid.focus();
}
});
}
// gets an instance of the control being hosted by this grid editor
get control() {
return this._ctl;
};
// 遍历查找树节点
_findNode(treeNode, key, val, nodeArr){
if(treeNode.dataItem && treeNode.dataItem[key] == val){
nodeArr.push(treeNode);
}else if(treeNode.nodes && treeNode.nodes.length>0){
for(let i=0; i<treeNode.nodes.length; i++){
if(treeNode.nodes[i].dataItem[key] == val){
nodeArr.push(treeNode.nodes[i]);
}else{
this._findNode(treeNode.nodes[i], key, val, nodeArr);
}
}
}
};
// handle the grid's beginningEdit event by canceling the built-in editor,
// initializing the custom editor and giving it the focus.
_beginningEdit(grid, args) {
// check that this is our column
// console.log(args)
if (grid.columns[args.col] != this._binding) {
// console.log(grid.columns[args.col])/
return;
}
// check that this is not the Delete key
// (which is used to clear cells and should not be messed with)
var evt = args.data;
if (evt && evt.keyCode == wijmo.Key.Delete) {
return;
}
// cancel built-in editor
args.cancel = true;
// save cell being edited
this._rng = args.range;
CustomGridEditor._isEditing = true;
// initialize editor host
var rcCell = grid.getCellBoundingRect(args.row, args.col), rcBody = document.body.getBoundingClientRect(), ptOffset = new wijmo.Point(-rcBody.left, -rcBody.top), zIndex = (args.row < grid.frozenRows || args.col < grid.frozenColumns) ? '3' : '';
wijmo.setCss(this._ctl.hostElement, {
position: 'absolute',
left: rcCell.left - 1 + ptOffset.x+8,
top: rcCell.top - 1 + ptOffset.y+8,
width: rcCell.width + 1,
height: grid.rows[args.row].renderHeight + 1,
borderRadius: '0px',
zIndex: zIndex,
});
// initialize editor content
/**
这句代码是负责在展开下拉前更新下拉状态的
在此处清空勾选状态即可。
*/
if (!wijmo.isUndefined(this._ctl['checkedItems']) && this._ctl['checkedItems'].length > 0) {
this._ctl['checkedItems'] = [];
}
// 这里设置回填数据
var cellVal = grid.getCellData(args.row, args.col);
var valArr = null;
if(cellVal && cellVal.length > 0){
valArr = cellVal.split(",");
}
if(valArr){
var treeData = this._treeData;
var findNode = this._findNode;
var _this = this;
var checkedNodes = [];
for(let i=0; i<valArr.length; i++){
this._ctl.nodes.forEach(function(node){
findNode.call(_this, node, "header", valArr[i], checkedNodes);
});
}
checkedNodes.forEach(function(node){
node.isChecked = true;
});
}
/*
else {
throw 'Can\'t set editor value/text...';
}
*/
// start editing item
var ecv = grid.editableCollectionView, item = grid.rows[args.row].dataItem;
if (ecv && item && item != ecv.currentEditItem) {
setTimeout(function () {
grid.onRowEditStarting(args);
ecv.editItem(item);
grid.onRowEditStarted(args);
}, 50); // wait for the grid to commit edits after losing focus
}
// activate editor
document.body.appendChild(this._ctl.hostElement);
this._ctl.focus();
setTimeout(() => {
// get the key that triggered the editor
var key = (evt && evt.charCode > 32)
? String.fromCharCode(evt.charCode)
: null;
// get input element in the control
var input = this._ctl.hostElement.querySelector('input');
// send key to editor
if (input) {
if (key) {
input.value = key;
wijmo.setSelectionRange(input, key.length, key.length);
var evtInput = document.createEvent('HTMLEvents');
evtInput.initEvent('input', true, false);
input.dispatchEvent(evtInput);
}
else {
input.select();
}
}
// give the control focus
if (!input && !this._openDropDown) {
this._ctl.focus();
}
// open drop-down on F4/alt-down
if (this._openDropDown && this._ctl instanceof wijmo.input.DropDown) {
this._ctl.isDroppedDown = true;
this._ctl.dropDown.focus();
}
}, 50);
}
// close the custom editor, optionally saving the edits back to the grid
_closeEditor(saveEdits) {
if (this._rng) {
var flexGrid = this._grid, ctl = this._ctl, host = ctl.hostElement;
// raise grid's cellEditEnding event
var e = new wijmo.grid.CellEditEndingEventArgs(flexGrid.cells, this._rng);
flexGrid.onCellEditEnding(e);
// save editor value into grid
if (saveEdits) {
/**
这里加一个判断，实现下拉tree回填逻辑
*/
if(!wijmo.isUndefined(ctl['checkedItems'])){
var vals = ctl['checkedItems'];
if(vals.length > 0){
var value = "";
vals.forEach(function(item){
if(item.header){
value += item.header + ","
}
})
if(value.length > 0){
value = value.substring(0, value.length-1);
}
this._grid.setCellData(this._rng.row, this._rng.col, value);
}else{
this._grid.setCellData(this._rng.row, this._rng.col, "");
}
}else if (!wijmo.isUndefined(ctl['value'])) {
this._grid.setCellData(this._rng.row, this._rng.col, ctl['value']);
}
else if (!wijmo.isUndefined(ctl['text'])) {
this._grid.setCellData(this._rng.row, this._rng.col, ctl['text']);
}
else {
throw 'Can\'t get editor value/text...';
}
this._grid.invalidate();
}
// close editor and remove it from the DOM
if (ctl instanceof wijmo.input.DropDown) {
ctl.isDroppedDown = false;
}
host.parentElement.removeChild(host);
this._rng = null;
CustomGridEditor._isEditing = false;
// raise grid's cellEditEnded event
flexGrid.onCellEditEnded(e);
}
}
// commit row edits, fire row edit end events (TFS 339615)
_commitRowEdits() {
var flexGrid = this._grid, ecv = flexGrid.editableCollectionView;
this._closeEditor(true);
if (ecv && ecv.currentEditItem) {
var e = new wijmo.grid.CellEditEndingEventArgs(flexGrid.cells, flexGrid.selection);
ecv.commitEdit();
setTimeout(() => {
flexGrid.onRowEditEnding(e);
flexGrid.onRowEditEnded(e);
flexGrid.invalidate();
});
}
}
}
//
document.readyState === 'complete' ? init() : window.onload = init;
//
function init() {
//
// create some random data
var countries = [
{ header: 'Electronics', img: 'resources/electronics.png', items: [
{ header: 'Trimmers/Shavers' },
{ header: 'Tablets' },
{ header: 'Phones', img: 'resources/phones.png', items: [
{ header: 'Apple' },
{ header: 'Motorola' },
{ header: 'Nokia' },
{ header: 'Samsung' }
]},
{ header: 'Speakers' },
{ header: 'Monitors' }
]}
];
var products = [
{ id: 0, name: 'Widget', unitPrice: 23.43 },
{ id: 1, name: 'Gadget', unitPrice: 12.33 },
{ id: 2, name: 'Doohickey', unitPrice: 53.07 }
];
var data = [];
var dt = new Date();
for (var i = 0; i < 10; i++) {
data.push({
id: i,
date: new Date(dt.getFullYear(), i % 12, 25, i % 24, i % 60, i % 60),
time: new Date(dt.getFullYear(), i % 12, 25, i % 24, i % 60, i % 60),
country: countries[0].header,
product: products[Math.floor(Math.random() * products.length)].name,
amount: Math.random() * 10000 - 5000,
discount: Math.random() / 4
});
}
//
// grid with custom editors
theGrid = new wijmo.grid.FlexGrid('#theGrid', {
keyActionTab: 'CycleOut',
autoGenerateColumns: false,
itemsSource: data,
columns: [
{ header: 'ID', binding: 'id', width: 40, isReadOnly: true },
{ header: 'Date', binding: 'date', format: 'd' ,"align":"right"},
{ header: 'Time', binding: 'time', format: 't' },
{ header: 'Country', binding: 'country' },
{ header: 'Product', binding: 'product' },
{ header: 'Amount', binding: 'amount', format: 'n2' }
],
beginningEdit: function (s, e) {
if (e.data.type == 'keypress' &&
!document.getElementById('quickEdit').checked) {
e.cancel = true;
}
},
itemFormatter: function (panel, r, c, cell) {//单元格的GridPanel，从0开始——单元格的行、列索引、单元格的HTML元素
var editRange = panel.grid.editRange;
// if (panel.cellType == wijmo.grid.CellType.Cell && editRange && editRange.row === r && editRange.col === c) {
// if(r==0){
// // if (grid.columns[c].binding == 'country') {
//
// console.log(panel.cellType == wijmo.grid.CellType.Cell)
// }
// }
}
});
new CustomGridEditor(theGrid, 3, wijmo.input.DropDownTree, {
itemsSource: countries
});
new CustomGridEditor(theGrid, 4, wijmo.input.DropDownTree, {
itemsSource: countries
});
// new CustomGridEditor(theGrid, 'amount', wijmo.input.InputNumber, {
// format: 'n2',
// step: 10
// });
//
// create an editor based on a ComboBox
// var multiColumnEditor = new CustomGridEditor(theGrid, 'product', wijmo.input.ComboBox, {
// headerPath: 'name',
// displayMemberPath: 'name',
// itemsSource: products
// });
//
// customize the ComboBox to show multiple columns
// var combo = multiColumnEditor.control;
// combo.listBox.formatItem.addHandler(function (s, e) {
// e.item.innerHTML = '<table><tr>' +
// '<td style="width:30px;text-align:right;padding-right:6px">' + e.data.id + '</td>' +
// '<td style="width:100px;padding-right:6px"><b>' + e.data.name + '</b></td>' +
// '<td style="width:80px;text-align:right;padding-right:6px">' +
// wijmo.Globalize.format(e.data.unitPrice, 'c') +
// '</td>' +
// '</tr></table>';
// });
}
</script>
</body>
</html>

复制代码

完整的实现，参考附件打包Demo。

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【自定义编辑器系列】FlexGrid中如何使用dropdowntree组件

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