我能够获得输入[placeholder]元素的句柄,但是尝试获取占位符属性的值是返回undefined – $(“input [placeholder]”).attr(“placeholder”).

我正在使用jquery 1.6.2.

这是jsfiddle.我修改了代码以在兼容html5的浏览器中工作,仅用于测试目的.

HTML

<input type="text" name="email" size="10" placeholder="EMAIL ADDRESS">

jQuery的

function SupportsInputPlaceholder() {
    var i = document.createElement("input");
    return "placeholder" in i;
}

$(document).ready(function(){
    if(!SupportsInputPlaceholder()) {
        //set initial value to placeholder attribute
        $("input[placeholder]").val($("input[placeholder]").attr("placeholder"));

        //create event handlers for focus and blur
        $("input[placeholder]").focus(function() {
            if($(this).val() == $(this).attr("placeholder")) {
                $(this).val("");
            }
        }).blur(function() {
            if($(this).val() == "") {
                $(this).val($(this).attr("placeholder"));
            }
        });
    }
});

感谢您的帮助,
乙