javascript - ComboBox typeAhead 可以工作，但 valueField 在某些行为条件下为空

Question

请在此处请求健全性检查...

ExtJS 4.2 组合框 Typeahead 可以工作，但在以下条件下检索 valueField 时出现问题:-

1) 如果用户键入一个值，然后单击其他位置而不是按 Enter 键或单击选择组合列表，则 valueField 为空，但会出现所选值。

2)假设组合框项目被正确选择，如果我输入一个附加字符然后退格该字符，组合框将无法再找到 valueField..它几乎就像重置了自己一样。

fiddle 示例

<强> https://fiddle.sencha.com/#fiddle/je1

如何重现

如果在组合框中输入 Maggie，您将在控制台窗口中看到 valueField ID，如果追加一个字符然后退格该字符，则控制台窗口中的 ID 为空

(您需要打开控制台窗 Eloquent 能查看输出)

forceSelection 无法解决此问题，因为我有一个模板，并且它不接受组合框中不属于商店的条目，并且我需要对 valueField 使用 sumID，因为我需要检索并传递该值到服务器。

Answer 1

谢谢大家，拥有如此出色的社区真是太棒了!

我能够通过使用forceSelection并覆盖setValue来解决这个问题，从而允许通过forceSelection选择不在商店中但在组合中的模板项。在我看来，从使用组合框开始，为了获得良好的外观和感觉，forceSelection 是最佳选择。

这是我的覆盖，请参阅语句//覆盖开始

这是一个快速修复，当我回到办公室时我会完善陈述，下面我将我凭内存粘贴的解决方案，你明白了。

setValue: function(value, doSelect) {
        var me = this,
            valueNotFoundText = me.valueNotFoundText,
            inputEl = me.inputEl,
            i, len, record,
            dataObj,
            matchedRecords = [],
            displayTplData = [],
            processedValue = [];

        if (me.store.loading) {
            // Called while the Store is loading. Ensure it is processed by the onLoad method.
            me.value = value;
            me.setHiddenValue(me.value);
            return me;
        }

        // This method processes multi-values, so ensure value is an array.
        value = Ext.Array.from(value);

        // Loop through values, matching each from the Store, and collecting matched records
        for (i = 0, len = value.length; i < len; i++) {
            record = value[i];
            if (!record || !record.isModel) {
                record = me.findRecordByValue(record);
            }
            // record found, select it.
            if (record) {
                matchedRecords.push(record);
                displayTplData.push(record.data);
                processedValue.push(record.get(me.valueField));
            }
            // record was not found, this could happen because
            // store is not loaded or they set a value not in the store
            else {
            //start of override

            // 'Select All Names' is the template item that was added                                     // to the combo box,  it looks like an entry from the store         
            // but it is not in the store
            if (me.forceSelection && me.getDisplayValue() === 'Select All Names'){
                    processedValue.push(value[i]);
                    dataObj = {};
                    dataObj[me.displayField] = value[i];
                    displayTplData.push(dataObj);
                }
                //end of override

                if (!me.forceSelection) {
                    processedValue.push(value[i]);
                    dataObj = {};
                    dataObj[me.displayField] = value[i];
                    displayTplData.push(dataObj);
                    // TODO: Add config to create new records on selection of a value that has no match in the Store
                }
                // Else, if valueNotFoundText is defined, display it, otherwise display nothing for this value
                else if (Ext.isDefined(valueNotFoundText)) {
                    displayTplData.push(valueNotFoundText);
                }
            }
        }

    // Set the value of this field. If we are multiselecting, then that is an array.
    me.setHiddenValue(processedValue);
    me.value = me.multiSelect ? processedValue : processedValue[0];
    if (!Ext.isDefined(me.value)) {
        me.value = null;
    }
    me.displayTplData = displayTplData; //store for getDisplayValue method
    me.lastSelection = me.valueModels = matchedRecords;

    if (inputEl && me.emptyText && !Ext.isEmpty(value)) {
        inputEl.removeCls(me.emptyCls);
    }

    // Calculate raw value from the collection of Model data
    me.setRawValue(me.getDisplayValue());
    me.checkChange();

    if (doSelect !== false) {
        me.syncSelection();
    }
    me.applyEmptyText();

    return me;
},