当用户单击下拉菜单时如何隐藏下拉菜单 [英] How to hide a dropdown when the user clicks outside of it
问题描述
下面是我正在使用的输入下拉列表的简化版本。
其作用的基本摘要是:如果您专注于输入,则下拉列表出现。如果单击下拉菜单中的选项之一,则该选项将填充输入,并且下拉菜单将消失。这是通过 onfocus
和我称为 dropdown();
和 undropdown()的函数实现的;
。
我陷入了困境,当有人点击其他地方时,我无法使下拉菜单消失。如果我使用 onblur
,它会成功隐藏下拉列表,但是如果单击某个选项,它将不会填充输入,这是因为 onblur
函数首先运行,因此 input();
函数不会运行,因为下拉列表已被隐藏。
如果在主体标签或其他父标签上放置 onclick
,则它会认为 onfocus
作为单击,在其中运行 dropdown();
函数,然后运行 undropdown();
立即功能,因此下拉菜单不会出现,因为功能重叠。
我希望能帮助您弄清楚如何对函数进行排序,以使它们以正确的顺序执行而不会彼此重叠。
JSFiddle可用此处。
函数输入(pos){var dropdown = document.getElementsByClassName('drop'); var li = dropdown [0] .getElementsByTagName( li); document.getElementsByTagName('input')[0] .value = li [pos] .innerHTML; undropdown(0);}函数dropdown(pos){document.getElementsByClassName('content')[pos] .style.display = block} function undropdown(pos){document.getElementsByClassName('content')[pos]。 style.display = none;}
.drop {职位:相对显示:inline-block;垂直对齐:顶部;溢出:可见;}。content {显示:无; list-style-type:无;边框:1px实线#000;填充:0;边距:0;位置:绝对; z索引:2;宽度:100%;最大高度:190px;溢出-y:滚动;}。content li {填充:12px 16px;显示:块; margin:0;}
< div class = drop > <输入type = text name = class placeholder = Class onfocus = dropdown(0) /> < ul class = content> < li onclick = input(0)>选项1< / li> < li onclick = input(1)>选项2< / li> < li onclick = input(2)>选项3< / li> < li onclick = input(3)>选项4< / li> < / ul>< / div>
PS:在除了上述问题外,我建议您进行编辑以使该问题的标题更好,以便遇到类似问题的人可以更轻松地找到它。
在这种情况下,可以在 onblur
上调用一个函数,该函数将触发 undropdown(0);
很小的setTimeout之后几乎立即执行。像这样:
function set(){
setTimeout(function(){
undropdown(0) ;
},100);
}
HTML
< input type = text name = class placeholder = Class onfocus = dropdown(0) onblur = set() / >
不需要其他更改。
函数输入(pos){var dropdown = document.getElementsByClassName('drop'); var li = dropdown [0] .getElementsByTagName( li); document.getElementsByTagName('input')[0] .value = li [pos] .innerHTML; undropdown(0);}函数dropdown(pos){document.getElementsByClassName('content')[pos] .style.display = block} function undropdown(pos){document.getElementsByClassName('content')[pos]。 style.display = none;} function set(){setTimeout(function(){undropdown(0);},100);}
.drop {position:relative;显示:inline-block;垂直对齐:顶部;溢出:可见; } .content {display:none; list-style-type:无;边框:1px实线#000;填充:0;边距:0;位置:绝对; z索引:2;宽度:100%;最大高度:190px;溢出y:滚动; } .content li {padding:12px 16px;显示:块;边距:0; }
< div class = drop> < input type = text name = class placeholder = Class onfocus = dropdown(0) onblur = set() /> < ul class = content> < li onclick = input(0)>选项1< / li> < li onclick = input(1)>选项2< / li> < li onclick = input(2)>选项3< / li> < li onclick = input(3)>选项4< / li> < / ul> < / div>
Below is a simplified version of the input dropdown I am working with.
A basic summary of what it does is: if you focus on the input, a dropdown appears. If you click one of the options in the dropdown, the option populates the input and the dropdown disappears. This is achieved using onfocus
and a functions I called dropdown();
and undropdown();
.
I'm in a dilemma, where I'm unable to make the dropdown disappear when someone clicks elsewhere. If I use onblur
, it successfully hides the dropdown, but if you click on an option it doesn't populate the input, this is because, the onblur
function runs first and, therefore, the input();
function doesn't not run because the dropdown is already hidden.
If you put an onclick
on the body tag, or other parent, it considers the onfocus
as a click, where it run's the dropdown();
function then the undropdown();
function immediately so the dropdown never appears since the functions overlap.
I would appreciate help on figuring out how to order the functions so that they are executed in the right order without overlapping with each other.
JSFiddle available here.
function input(pos) {
var dropdown = document.getElementsByClassName('drop');
var li = dropdown[0].getElementsByTagName("li");
document.getElementsByTagName('input')[0].value = li[pos].innerHTML;
undropdown(0);
}
function dropdown(pos) {
document.getElementsByClassName('content')[pos].style.display = "block"
}
function undropdown(pos) {
document.getElementsByClassName('content')[pos].style.display = "none";
}
.drop {
position: relative;
display: inline-block;
vertical-align: top;
overflow: visible;
}
.content {
display: none;
list-style-type: none;
border: 1px solid #000;
padding: 0;
margin: 0;
position: absolute;
z-index: 2;
width: 100%;
max-height: 190px;
overflow-y: scroll;
}
.content li {
padding: 12px 16px;
display: block;
margin: 0;
}
<div class="drop">
<input type="text" name="class" placeholder="Class" onfocus="dropdown(0)"/>
<ul class="content">
<li onclick="input(0)">Option 1</li>
<li onclick="input(1)">Option 2</li>
<li onclick="input(2)">Option 3</li>
<li onclick="input(3)">Option 4</li>
</ul>
</div>
PS: In addition to the above problem, I would appreciate suggestion for edits to get a better title for this question such that someone experiencing a similar problem could find it more easily.
In this case, On onblur
you could call a function which fires the undropdown(0);
after a very tiny setTimeout almost instantly. Like so:
function set() {
setTimeout(function(){
undropdown(0);
}, 100);
}
HTML
<input type="text" name="class" placeholder="Class" onfocus="dropdown(0)" onblur="set()" />
No other change is required.
function input(pos) {
var dropdown = document.getElementsByClassName('drop');
var li = dropdown[0].getElementsByTagName("li");
document.getElementsByTagName('input')[0].value = li[pos].innerHTML;
undropdown(0);
}
function dropdown(pos) {
document.getElementsByClassName('content')[pos].style.display= "block"
}
function undropdown(pos) {
document.getElementsByClassName('content')[pos].style.display= "none";
}
function set() {
setTimeout(function(){
undropdown(0);
}, 100);
}
.drop {
position: relative;
display: inline-block;
vertical-align:top;
overflow: visible;
}
.content {
display: none;
list-style-type: none;
border: 1px solid #000;
padding: 0;
margin: 0;
position: absolute;
z-index: 2;
width: 100%;
max-height: 190px;
overflow-y: scroll;
}
.content li {
padding: 12px 16px;
display: block;
margin: 0;
}
<div class="drop">
<input type="text" name="class" placeholder="Class" onfocus="dropdown(0)" onblur="set()" />
<ul class="content">
<li onclick="input(0)">Option 1</li>
<li onclick="input(1)">Option 2</li>
<li onclick="input(2)">Option 3</li>
<li onclick="input(3)">Option 4</li>
</ul>
</div>
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