一、效果与使用

 二、代码

/// 

//封闭在IIFE中
(Handsontable => {
    class MultiSelectEditor extends Handsontable.editors.BaseEditor {
        // ...rest of the editor code
        /**
        * Initializes editor instance, DOM Element and mount hooks.
        * 初始化编辑器实例，dom元素和挂载钩子函数
        */
        init() {
            // Create detached node, add CSS class and make sure its not visible
            //增加触发节点，增加class类并确保节点隐藏隐藏
            var ComboSelect = document.createElement("select");
            this.select = ComboSelect;
            Handsontable.dom.addClass(this.select, 'htSelectEditor');
            this.select.style.display = 'none';

            // Attach node to DOM, by appending it to the container holding the table
            this.hot.rootElement.appendChild(this.select);
        }
        //getValue() {
        //    return $(this.select).find("option:selected").text();
        //}

        //setValue(value) {
        //    this.select.value = value;
        //}
        ////编辑器的值加载到单元格
        getValue() {
            var n = parseInt(this.select.value);
            if (!isNaN(n)) {
                return n;
            }
            return this.select.value;
        }

        ////单元格的值加载到编辑器
        setValue(value) {
            $(this.select).find(`option[value='${value}']`).attr("selected", true);
        }

        //打开编辑器
        open() {
            this._opened = true;
            this.refreshDimensions();
            this.select.style.display = '';
        }

        //编辑器样式计算
        refreshDimensions() {
            this.TD = this.getEditedCell();

            // TD is outside of the viewport.
            if (!this.TD) {
                this.close();

                return;
            }
            const { wtOverlays } = this.hot.view.wt;
            const currentOffset = Handsontable.dom.offset(this.TD);
            const containerOffset = Handsontable.dom.offset(this.hot.rootElement);
            const scrollableContainer = wtOverlays.scrollableElement;
            const editorSection = this.checkEditorSection();
            let width = Handsontable.dom.outerWidth(this.TD) + 1;
            let height = Handsontable.dom.outerHeight(this.TD) + 1;
            let editTop = currentOffset.top - containerOffset.top - 1 - (scrollableContainer.scrollTop || 0);
            let editLeft = currentOffset.left - containerOffset.left - 1 - (scrollableContainer.scrollLeft || 0);
            let cssTransformOffset;

            switch (editorSection) {
                case 'top':
                    cssTransformOffset = Handsontable.dom.getCssTransform(wtOverlays.topOverlay.clone.wtTable.holder.parentNode);
                    break;
                case 'left':
                    cssTransformOffset = Handsontable.dom.getCssTransform(wtOverlays.leftOverlay.clone.wtTable.holder.parentNode);
                    break;
                case 'top-left-corner':
                    cssTransformOffset = Handsontable.dom.getCssTransform(wtOverlays.topLeftCornerOverlay.clone.wtTable.holder.parentNode);
                    break;
                case 'bottom-left-corner':
                    cssTransformOffset = Handsontable.dom.getCssTransform(wtOverlays.bottomLeftCornerOverlay.clone.wtTable.holder.parentNode);
                    break;
                case 'bottom':
                    cssTransformOffset = Handsontable.dom.getCssTransform(wtOverlays.bottomOverlay.clone.wtTable.holder.parentNode);
                    break;
                default:
                    break;
            }

            if (this.hot.getSelectedLast()[0] === 0) {
                editTop += 1;
            }
            if (this.hot.getSelectedLast()[1] === 0) {
                editLeft += 1;
            }

            const selectStyle = this.select.style;

            if (cssTransformOffset && cssTransformOffset !== -1) {
                selectStyle[cssTransformOffset[0]] = cssTransformOffset[1];
            } else {
                Handsontable.dom.resetCssTransform(this.select);
            }

            const cellComputedStyle = Handsontable.dom.getComputedStyle(this.TD, this.hot.rootWindow);

            if (parseInt(cellComputedStyle.borderTopWidth, 10) > 0) {
                height -= 1;
            }
            if (parseInt(cellComputedStyle.borderLeftWidth, 10) > 0) {
                width -= 1;
            }

            selectStyle.height = `${height}px`;
            selectStyle.minWidth = `${width}px`;
            selectStyle.top = `${editTop}px`;
            selectStyle.left = `${editLeft}px`;
            selectStyle.margin = '0px';
        }

        //获取当前单元格
        getEditedCell() {
            const { wtOverlays } = this.hot.view.wt;
            const editorSection = this.checkEditorSection();
            let editedCell;

            switch (editorSection) {
                case 'top':
                    editedCell = wtOverlays.topOverlay.clone.wtTable.getCell({
                        row: this.row,
                        col: this.col
                    });
                    this.select.style.zIndex = 101;
                    break;
                case 'corner':
                    editedCell = wtOverlays.topLeftCornerOverlay.clone.wtTable.getCell({
                        row: this.row,
                        col: this.col
                    });
                    this.select.style.zIndex = 103;
                    break;
                case 'left':
                    editedCell = wtOverlays.leftOverlay.clone.wtTable.getCell({
                        row: this.row,
                        col: this.col
                    });
                    this.select.style.zIndex = 102;
                    break;
                default:
                    editedCell = this.hot.getCell(this.row, this.col);
                    this.select.style.zIndex = '';
                    break;
            }

            return editedCell < 0 ? void 0 : editedCell;
        }

        focus() {
            this.select.focus();
        }

        close() {
            this._opened = false;
            this.select.style.display = 'none';
        }

        //读取选项配置到编辑器
        prepare(row, col, prop, td, originalValue, cellProperties) {
            // Remember to invoke parent's method
            super.prepare(row, col, prop, td, originalValue, cellProperties);
            const selectOptions = this.cellProperties.selectOptions;
            let options;

            if (typeof selectOptions === 'function') {
                options = this.prepareOptions(selectOptions(this.row, this.col, this.prop));
            } else {
                options = this.prepareOptions(selectOptions);
            }

            Handsontable.dom.empty(this.select);

            Handsontable.helper.objectEach(options, (value, key0) => {
                const optionElement = this.hot.rootDocument.createElement('OPTION');
                optionElement.value = value.valueField;

                Handsontable.dom.fastInnerHTML(optionElement, value.textField);
                this.select.appendChild(optionElement);
            });
        }
        prepareOptions(optionsToPrepare) {
            let preparedOptions = {};

            if (Array.isArray(optionsToPrepare)) {
                for (let i = 0, len = optionsToPrepare.length; i < len; i++) {
                    preparedOptions[i] = optionsToPrepare[i];
                }

            } else if (typeof optionsToPrepare === 'object') {
                preparedOptions = optionsToPrepare;
            }

            return preparedOptions;
        }
    }


    // Put editor in dedicated namespace
    //将编辑器添加到专用命名空间
    Handsontable.editors.MultiSelectEditor = MultiSelectEditor;
    // Register alias
    //编辑器注册别名
    Handsontable.editors.registerEditor('ComboSelect', MultiSelectEditor);

    //输入框渲染器
    function comboRender(instance, td, row, col, prop, value, cellProperties) {
        td.style["text-align"] = "center";
        const selectOptions = cellProperties.selectOptions;
        for (var i = 0; i < selectOptions.length; i++) {
            if (selectOptions[i].valueField == value) {
                td.innerHTML = selectOptions[i].textField;
                return value;
            }
        }
    }
    Handsontable.renderers.registerRenderer('comboRender', comboRender);

})(Handsontable);