让IE支持placeholder属性

来源:互联网 发布:部落冲突12本建筑数据 编辑:程序博客网 时间:2024/05/16 07:02
html 5 有个很棒的属性,placeholder,在鼠标聚焦到input输入框上面时候,提示文字会消失,失去焦点之后,又会出现:

但是在不支持html5的低版本的浏览器中,placeholder属性是无效的,为了解决这个问题,因此,人为的去实现placeholder属性:
/*
 * jQuery placeholder, fix for IE6,7,8,9
 * @author JENA
 * @since 20131115.1504
 * @website ishere.cn
 */
var JPlaceHolder = {
    //检测
    _check :function(){
        return'placeholder' in document.createElement('input');
    },
    //初始化
    init :function(){
        if(!this._check()){
            this.fix();
        }
    },
    //修复
    fix :function(){
        jQuery(':input[placeholder]').each(function(index, element) {
            varself = $(this), txt = self.attr('placeholder');
            self.wrap($('<div></div>').css({position:'relative', zoom:'1', border:'none', background:'none', padding:'none', margin:'none'}));
            varpos = self.position(), h = self.outerHeight(true), paddingleft = self.css('padding-left');
            varholder = $('<span></span>').text(txt).css({position:'absolute', left:pos.left, top:pos.top, height:h, lienHeight:h, paddingLeft:paddingleft, color:'#aaa'}).appendTo(self.parent());
            self.focusin(function(e) {
                holder.hide();
            }).focusout(function(e) {
                if(!self.val()){
                    holder.show();
                }
            });
            holder.click(function(e) {
                holder.hide();
                self.focus();
            });
        });
    }
};
//执行
jQuery(function(){
    JPlaceHolder.init();   
});


将上述JS引入页面中,inuput即可显示提示信息(兼容IE10以下)

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