IE,HTML5,表单,placeholder，具体代码如下：
(function ($) {
$.fn.placeholder = function (options) {
var defaults = {
pColor: "#ccc",
pActive: "#999",
pFont: "14px",
activeBorder: "#080",
posL: 8,
zIndex: "99"
},
opts = $.extend(defaults, options);
//
return this.each(function () {
if ("placeholder" in document.createElement("input")) return;
$(this).parent().css("position", "relative");
var isIE = $.browser.msie,
version = $.browser.version;
//不支持placeholder的浏览器
var $this = $(this),
msg = $this.attr("placeholder"),
iH = $this.outerHeight(),
iW = $this.outerWidth(),
iX = $this.position().left,
iY = $this.position().top,
oInput = $("<label>", {
"class": "test",
"text": msg,
"css": {
"position": "absolute",
"left": iX + "px",
"top": iY + "px",
"width": iW - opts.posL + "px",
"padding-left": opts.posL + "px",
"height": iH + "px",
"line-height": iH + "px",
"color": opts.pColor,
"font-size": opts.pFont,
"z-index": opts.zIndex,
"cursor": "text"
}
}).insertBefore($this);
//初始状态就有内容
var value = $this.val();
if (value.length > 0) {
oInput.hide();
};
//
$this.on("focus", function () {
var value = $(this).val();
if (value.length > 0) {
oInput.hide();
}
oInput.css("color", opts.pActive);
//
if(isIE && version < 9){
var myEvent = "propertychange";
}else{
var myEvent = "input";
}
$(this).on(myEvent, function () {
var value = $(this).val();
if (value.length == 0) {
oInput.show();
} else {
oInput.hide();
}
});
}).on("blur", function () {
var value = $(this).val();
if (value.length == 0) {
oInput.css("color", opts.pColor).show();
}
});
//
oInput.on("click", function () {
$this.trigger("focus");
$(this).css("color", opts.pActive)
});
//
$this.filter(":focus").trigger("focus");
});
}
})(jQuery)
调用方法：
//解决IE下不支持placeholder
if($.browser.msie) {
$(":input[placeholder]").each(function(){
$(this).placeholder();
});
}
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