下面代码实测通过，直接copy到本地运行即可。
<!DOCTYPE html>
<html> <head>
<meta charset="UTF-8">
<title></title>
<script src="https://cdn.bootcss.com/angular.js/1.2.14/angular.min.js"></script>
<style>
.yf-input-container {
position: relative;
font-size: 14px;
margin-bottom: 10px;
} .yf-input-container input {
height: 20px;
line-height: 20px;
}
</style>
</head> <body>
<div ng-controller="superPoolCtrl">
<div class="yf-input-container">
姓名：<input type="text" ng-model="name" yf-placeholder="请输入姓名" />
</div>
<div class="yf-input-container">
电话：<input type="text" ng-model="tel" yf-placeholder="请输入电话" />
</div>
<div>
<div class="yf-input-container">
职位：<input type="text" ng-model="job" yf-placeholder="请输入职位" />
</div>
</div>
</div>
<script>
var moduleName = 'bidmeApp';
var app = angular.module(moduleName, [])
.controller('superPoolCtrl', ['$scope', '$rootScope', '$timeout', function($scope, $rootScope, $timeout) {
$timeout(function() {
$scope.tel = "13800138000";
}, 1000);
$scope.name = "http://www.cnblogs.com/chenchenghua/";
}])
.directive('yfPlaceholder', function() {
return {
restrict: 'A', //指令取属性
scope: false, //与父级共享作用域
replace: true,
require: '',
template: function(elem, attr) {
return '<input />'
},
link: function(scope, element, attr) {
var inputEle = element[0];
var supportPlaceholder = "placeholder" in document.createElement("input") ? true : false;
if(supportPlaceholder) {
inputEle.setAttribute('placeholder', attr.yfPlaceholder);
} else {
function insertAfter(newElement, targetElement) { // newElement是要追加的元素 targetElement 是指定元素的位置
var parent = targetElement.parentNode; // 找到指定元素的父节点
if(parent.lastChild == targetElement) { // 判断指定元素的是否是节点中的最后一个位置 如果是的话就直接使用appendChild方法
parent.appendChild(newElement, targetElement);
} else {
parent.insertBefore(newElement, targetElement.nextSibling);
};
};
var node = angular.element(document.createElement('span'));
node.css({
position: 'absolute',
zIndex: '1',
color: '#A9A9A9',
top: inputEle.offsetTop + 'px',
left: inputEle.offsetLeft + 'px',
width: inputEle.offsetWidth + 'px',
height: inputEle.offsetHeight + 'px',
lineHeight: inputEle.offsetHeight + 'px',
textIndent: '5px',
cursor: 'text'
}).text(attr.yfPlaceholder);
angular.element(inputEle).after(node); node.on('click', function(a, b, c) { //点击placeholder，隐藏。input获取焦点
node.css({
"display": 'none'
});
inputEle.focus();
}); angular.element(inputEle).on('blur', function() { //input失去焦点时，做判断
if(inputEle.value.length < 1) {
node.css({
"display": 'block'
});
}
}); angular.element(inputEle).on('focus', function() { //input失去焦点时，做判断
if(inputEle.value.length < 1) {
node.css({
"display": 'none'
});
}
}); scope.$watch(attr.ngModel, function(newVal, oldVal) { //监听，比如开始有值或者异步请求回显，placeholder隐藏
if(!!newVal && newVal.length > 0) {
node.css({
"display": 'none'
});
}
});
}
}
};
});
angular.bootstrap(document.body, [moduleName]);
</script>
</body> </html>
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
欢迎转载，转载请注明作者：飘飞的夏秋 和出处 http://www.cnblogs.com/chenchenghua/p/6757736.html