absolute独立使用之下拉框最佳实践

时间:2022-11-21 08:43:48

absolute独立使用之下拉框最佳实践         absolute独立使用之下拉框最佳实践

说明:传统的做法是给外部盒子relative定位,再给弹出框absolute定位,而这里我们将absolute独立使用

html

    <div class="search">
<ul id="result">
<li><a href="#">分享:CSS深入理解之float浮动</a></li>
<li><a href="#">案例:CSS圆角进化论</a></li>
<li><a href="#">案例:CSS Sprite雪碧图应用</a></li>
<li><a href="#">案例:CSS3 3D 特效</a></li>
</ul>
<input type="text" class="search-input" placeholder="课程搜索">
<a href="javascript:;" class="search-btn">搜索</a>
</div>

css

        .search{margin:20px;overflow:hidden;}
.search .search-input{width:200px;line-height:18px; padding:10px; margin:; border:0 none;font-size:12px;font-family:inherit; float: left; }
.search.focus{border-color: #2ea7e0; }
.search .search-input:focus{outline:0 none;}
.search .search-btn{width:38px;height:38px;float:left;background: url(images/search.png);text-indent:-9em;overflow:hidden; }
.search.focus .search-btn{background-position:0 -38px;}
#result{
display:none;
position:absolute;
width:260px;
margin:39px 0 0 -1px;
padding-left:;
list-style-type:none;
border:1px solid #e6e8e9;
background-color:#fff;
box-shadow:0px 1px 2px #d5d7d8;
font-size:12px;
}
#result>li{line-height:30px;padding-left:12px; }
#result>li:hover{background-color:#f9f9f9;}
#result a {display:block;color: #5e5e5e;text-decoration: none; }
#result a:hover {color:#000; }

javascript

(function() {
var input = document.getElementsByTagName("input")[0],
result = document.getElementById("result"); if (input && result) {
input.onfocus = function() {
this.parentNode.className = "search focus";
if (this.value !== "") {
result.style.display = "block";
}
};
input.onblur = function() {
if (this.value === "") {
this.parentNode.className = "search";
}
result.style.display = "none";
}; // IE7 that wrap a DIV for avoid bad effect from float
if (!document.querySelector) {
var div = document.createElement("div");
input.parentNode.insertBefore(div, input);
div.appendChild(result);
}
// events of datalist
if ("oninput" in input) {
input.addEventListener("input", function() {
if (this.value.trim() != "") {
result.style.display = "block";
} else {
result.style.display = "none";
}
});
} else {
// IE6-IE8
input.onpropertychange = function(event) {
event = event || window.event;
if (event.propertyName == "value" && /focus/.test(this.parentNode.className)) {
if (this.value != "") {
result.style.display = "block";
} else {
result.style.display = "none";
}
}
};
}
} })();