我希望select元素的默认选项值的宽度更短。当用户选择另一个选项时,select元素应自行调整大小,以便整个文本始终在元素中可见。
我在问题Auto resizing the SELECT element according to selected OPTION's width中找到了一个解决方案,但它不适用于bootstrap,我不知道为什么。
这是我的尝试:
$(document).ready(function() {
$('select').change(function(){
$("#width_tmp").html($('select option:selected').text());
// 30 : the size of the down arrow of the select box
$(this).width($("#width_tmp").width()+30);
});
});
.btn-select {
color: #333;
background-color: #f5f5f5;
border-color: #ccc;
padding:7px;
}
select {
width: 60px;
}
#width_tmp{
display : none;
}
<link href="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.2/css/bootstrap.css" rel="stylesheet"/>
<link href="//cdnjs.cloudflare.com/ajax/libs/font-awesome/4.3.0/css/font-awesome.css" rel="stylesheet"/>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.2/js/bootstrap.js"></script>
<div class="form-group">
<div class="input-group">
<span class="input-group-btn">
<select class="btn btn-select align-left">
<option>All</option>
<option>Longer</option>
<option>A very very long string...</option>
</select>
<span id="width_tmp"></span>
</span>
<input type="text" class="form-control" placeholder="Search by...">
<span class="input-group-btn">
<button class="btn btn-default" type="button">
<i class="fa fa-search"></i>
</button>
</span>
</div>
</div>
答案 0 :(得分:8)
出现此问题是因为#width_tmp
嵌套在.input-group-btn
下,因此它从bootstrap继承了font-size: 0;
属性。因此,元素的计算宽度始终为零:
要解决此问题,只需移动<span id="width_tmp"></span>
,使其不在输入组内。
更好的选择是使用插件来处理整个操作的开始。这是我刚刚掀起的一个。
该插件动态创建并销毁span
,因此不会使您的HTML混乱。这有助于区分问题,并允许您将该功能委派给另一个文件,并轻松地在多个页面中重复使用多个元素。
(function($, window){
var arrowWidth = 30;
$.fn.resizeselect = function(settings) {
return this.each(function() {
$(this).change(function(){
var $this = $(this);
// create test element
var text = $this.find("option:selected").text();
var $test = $("<span>").html(text);
// add to body, get width, and get out
$test.appendTo('body');
var width = $test.width();
$test.remove();
// set select width
$this.width(width + arrowWidth);
// run on start
}).change();
});
};
// run by default
$("select.resizeselect").resizeselect();
})(jQuery, window);
您可以通过以下两种方式之一初始化插件:
HTML - 将班级.resizeselect
添加到任何选择元素:
<select class="btn btn-select resizeselect">
<option>All</option>
<option>Longer</option>
<option>A very very long string...</option>
</select>
JavaScript - 在任何jQuery对象上调用.resizeselect()
:
$("select").resizeselect()
(function($, window){
var arrowWidth = 30;
$.fn.resizeselect = function(settings) {
return this.each(function() {
$(this).change(function(){
var $this = $(this);
// create test element
var text = $this.find("option:selected").text();
var $test = $("<span>").html(text);
// add to body, get width, and get out
$test.appendTo('body');
var width = $test.width();
$test.remove();
// set select width
$this.width(width + arrowWidth);
// run on start
}).change();
});
};
// run by default
$("select.resizeselect").resizeselect();
})(jQuery, window);
.btn-select {
color: #333;
background-color: #f5f5f5;
border-color: #ccc;
padding:7px;
}
<link href="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.2/css/bootstrap.css" rel="stylesheet"/>
<link href="//cdnjs.cloudflare.com/ajax/libs/font-awesome/4.3.0/css/font-awesome.css" rel="stylesheet"/>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.2/js/bootstrap.js"></script>
<div class="form-group">
<div class="input-group">
<span class="input-group-btn">
<select class="btn btn-select resizeselect">
<option>All</option>
<option>Longer</option>
<option>A very very long string...</option>
</select>
</span>
<input type="text" class="form-control" placeholder="Search by...">
<span class="input-group-btn">
<button class="btn btn-default" type="button">
<i class="fa fa-search"></i>
</button>
</span>
</div>
</div>