dijit filteringSelect with min length

问题:

I can't seem to find a way to require the filtering select input to be of a certain length. I've tried like this:

new dijit.form.FilteringSelect({
    'name': 'bla',
    'store': jsonRestStore,
    'searchAttr': "name",
    'pattern': '.{3,}',
    'regExp': '.{3,}'
});

but it doesn't change a thing. I want the filtering select to only query the store, if at least 3 characters have been entered. Can't be that exotic a requirement, can it? There are thousands of items behind that store, so querying that with just 1 or 2 characters is slow.

回答1:

I did a bit more searching and found this post on the dojo mailing list. To summarize, there is no way to native support in the FilteringSelect for it, but it is extremely easy to implement.

// custom min input character count to trigger search
minKeyCount: 3,

// override search method, count the input length
_startSearch: function (/*String*/key) {
    if (!key || key.length < this.minKeyCount) {
    this.closeDropDown();
    return;
    }
    this.inherited(arguments);
}

Also in the API Docs, there is a searchDelay attribute, which could be helpful in minimizes the number of queries.

searchDelay 
Delay in milliseconds between when user types something and we start searching based on that value