Dojo：选择FilteringSelect的空值，而required = false

问题描述

请看这个代码：

dojo.require('dijit.form.FilteringSelect');
dojo.require('dojo.store.JsonRest');

dojo.declare('JsonFilteringSelect', dijit.form.FilteringSelect, {
    constructor: function (options) {
        dojo.declare.safeMixin(this, options);
        if (this.url) {
            this.store = new dojo.store.JsonRest({
                target: this.url
            });
        } else {
            console.log('JsonFilteringSelect: options.url is not defined');
        }
    }
});

var getPersonJsonFilteringSelect = new JsonFilteringSelect({
            url: '/person/get',
            name: 'Test',
            title: 'Test title',
            required: false,
            autoComplete:false,
            value: '',
            pageSize:10,
            queryExpr:'${0}'
        }, dojo.byId('select'));

getPersonJsonFilteringSelect.startup();
});

用例：假设我的FilteringSelect中有20个结果。

Use case: Suppose I have 20 results into my FilteringSelect.

1. 用户选择1个FilteringSelect的值。


2. 此值设置为
   FilteringSelect。


3. 但用户决定在
   空值上更改此值。


4. 据了解，因为必需：false FilteringSelect应允许
   设置空值，但不是。我在这里观察到这个行为：
   

1. User selects 1 value of FilteringSelect.
2. This value set as value ofFilteringSelect.
3. But after user decides to change this value on empty value.
4. As I understand, because required:false FilteringSelect should allowto set empty value, but it is not. I observe this behavior here:

1. 用户点击FilteringSelect文本框


2. 用户清除


3. 用户按Tab或其他元素点击 - FilteringSelect自动选择第一个值。

1. User clicks FilteringSelect textbox
2. User clears it
3. While user presses "Tab" or clicks by other element - FilteringSelect automatically selects first value.

我如何允许用户将空值设置为FilteringSelect？

How could I allow user to set empty value into FilteringSelect?

推荐答案

您应该添加一个空的条目（或者是否可能？我知道工作）到你的数据存储加载后（我会把它放在一开始），但在启动之前。

You should add an empty entry ("" or null maybe? I know "" works) to your data store after it's loaded (I'd put it at the beginning) but before startup of the widget.

FilteringSelect的必需问题很奇怪，因为它不会让您选择任意值 - 它必须是数据存储中的条目。然而，如果不需要它不应该不在乎吗？有时候Dojo很奇怪。

The "required" issue is strange with FilteringSelect because it won't let you select any arbitrary value -- it has to be an entry from the data store. Yet, if it's not required shouldn't it not care?... Dojo is strange sometimes.

这篇关于Dojo：选择FilteringSelect的空值，而required = false的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！