伪元素和SELECT标签 [英] Pseudo elements and SELECT tag

问题描述

我尝试在Google上搜索，但找不到它。 SELECT标签是否允许使用：after 选择器以便在其后创建伪元素？

I've tried searching it on Google but couldn't find it. Does the SELECT tag allows to use the :after selector in order to create a pseudo element after it?

我在Mac上尝试使用Chrome，Safari和Firefox，似乎无法正常工作。

I've tried on Chrome, Safari and Firefox on Mac and it doesn't seem to work.

推荐答案

好吧，它看起来像SELECT标签不允许：after或：在pseudos之前，因为它们是由每个供应商定制的，所以很难修改它们， t allow：before或：after伪元素。

Well, it looks like the SELECT tags doesn't allow :after or :before pseudos because they are customized by each vendor, so it's quite hard to modify them and that's because they don't allow :before or :after pseudo elements on them.

对于所有看到这个的人来说，使用jQuery和最小修改创建一个自定义SELECT元素是一个很好的选择。 。创建一个选择，然后使用jQuery来编辑它：

To everyone who sees this, there's a good option to create a custom SELECT element with jQuery and minimal modification... Create a select and then use jQuery to edit it:

// Iterate over each select element
$('select').each(function() {

// Cache the number of options
var $this = $(this),
    numberOfOptions = $(this).children('option').length;

// Hides the select element
$this.addClass('s-hidden');

// Wrap the select element in a div
$this.wrap('<div class="select"></div>');

// Insert a styled div to sit over the top of the hidden select element
$this.after('<div class="styledSelect"></div>');

// Cache the styled div
var $styledSelect = $this.next('div.styledSelect');

// Show the first select option in the styled div
$styledSelect.text($this.children('option').eq(0).text());

// Insert an unordered list after the styled div and also cache the list
var $list = $('<ul />', {
    'class': 'options'
}).insertAfter($styledSelect);

// Insert a list item into the unordered list for each select option
for (var i = 0; i < numberOfOptions; i++) {
    $('<li />', {
        text: $this.children('option').eq(i).text(),
        rel: $this.children('option').eq(i).val()
    }).appendTo($list);
}

// Cache the list items
var $listItems = $list.children('li');

// Show the unordered list when the styled div is clicked (also hides it if the div is clicked again)
$styledSelect.click(function(e) {
    e.stopPropagation();
    $('div.styledSelect.active').each(function() {
        $(this).removeClass('active').next('ul.options').hide();
    });
    $(this).toggleClass('active').next('ul.options').toggle();
});

// Hides the unordered list when a list item is clicked and updates the styled div to show the selected list item
// Updates the select element to have the value of the equivalent option
$listItems.click(function(e) {
    e.stopPropagation();
    $styledSelect.text($(this).text()).removeClass('active');
    $this.val($(this).attr('rel'));
    $list.hide();
    /* alert($this.val()); Uncomment this for demonstration! */
});

// Hides the unordered list when clicking outside of it
$(document).click(function() {
    $styledSelect.removeClass('active');
    $list.hide();
});

});

http： //jsfiddle.net/tovic/ZTHkQ/

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