如何使select2占位符用于搜索输入 [英] How make select2 placeholder for search input

问题描述

如何为select2 jQuery插件制作占位符。在StackOverflow上，许多人回答了如何在那里制作占位符，但是关于元素的占位符。我需要为搜索框指定占位符，请参阅图片。

How to make placeholder for select2 jQuery plugin. On StackOverflow many answers how to make placeholder there, but they about element's placeholder. I need to specify a placeholder for the search box, see pic.

推荐答案

我有同样的需求，我最终为 Select2 插件编写了一个小扩展。

I had the same need and I had ended up writing a small extension for the Select2 plugin.

有一个插件的新选项 searchInputPlaceholder ，以便为搜索输入字段设置占位符。

There is a new option for the plugin, searchInputPlaceholder, in order to set a placeholder for the 'search' input field.

在插件的js文件后面添加以下代码：

Add the following code right after the plugin's js file:

(function($) {

    var Defaults = $.fn.select2.amd.require('select2/defaults');

    $.extend(Defaults.defaults, {
        searchInputPlaceholder: ''
    });

    var SearchDropdown = $.fn.select2.amd.require('select2/dropdown/search');

    var _renderSearchDropdown = SearchDropdown.prototype.render;

    SearchDropdown.prototype.render = function(decorated) {

        // invoke parent method
        var $rendered = _renderSearchDropdown.apply(this, Array.prototype.slice.apply(arguments));

        this.$search.attr('placeholder', this.options.get('searchInputPlaceholder'));

        return $rendered;
    };

})(window.jQuery);

用法：

使用 searchInputPlaceholder 选项初始化select2插件：

Initialize the select2 plugin with the searchInputPlaceholder option:

$("select").select2({
    // options 
    searchInputPlaceholder: 'My custom placeholder...'
});

演示：

JsFiddle 上的演示。

Github回购：

https ：//github.com/andreivictor/select2-searchInputPlaceholder

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