<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>简单实现IE9及以下对placeholder的兼容性</title>
<style>
* {margin: 0;padding: 0;font-family: "Microsoft YaHei";font-size: 14px;}
.input-box {margin: 10px;position: relative;width: 100px;height: 30px;line-height: 30px;}
.input1 {width: 100%;height: 100%;padding-left: 5px;}
.input2 {width: 100%;height: 100%;padding-left: 10px;}
.placeholder {position: absolute;top: 0;z-index: 10;color: #888;}
</style>
</head>
<body>
<div class="input-box">
<input class="input1" type="text" placeholder="请输入标题">
</div>
<div class="input-box">
<input class="input2" type="text" placeholder="请输入文章">
</div>
<script src="jquery-1.11.3.js"></script>
<script>
$(function(){
// 兼容IE9下的placeholder
function placeholderSupport() {
return 'placeholder' in document.createElement('input');
}
if(!placeholderSupport()){ // 判断浏览器是否支持 placeholder
$("[placeholder]").each(function(){
var _this = $(this);
var left = _this.css("padding-left");
_this.parent().append('<span class="placeholder" data-type="placeholder" style="left: ' + left + '">' + _this.attr("placeholder") + '</span>');
if(_this.val() != ""){
_this.parent().find("span.placeholder").hide();
}
else{
_this.parent().find("span.placeholder").show();
}
}).on("focus", function(){
$(this).parent().find("span.placeholder").hide();
}).on("blur", function(){
var _this = $(this);
if(_this.val() != ""){
_this.parent().find("span.placeholder").hide();
}
else{
_this.parent().find("span.placeholder").show();
}
});
// 点击表示placeholder的标签相当于触发input
$("span.placeholder").on("click", function(){
$(this).hide();
$(this).siblings("[placeholder]").trigger("click");
$(this).siblings("[placeholder]").trigger("focus");
});
}
})
</script>
</body>
</html>