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Detailed explanation of JS imitation Alipay input text input box amplification component
Detailed explanation of JS imitation Alipay input text input box amplification component
This article mainly brings you an example of a JS imitation Alipay input text input box amplification component. The editor thinks it is quite good, so I will share it with you now and give it as a reference for everyone. Let’s follow the editor to take a look, I hope it can help everyone.
You can display a digital magnifying glass behind when inputting
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>JS 仿支付宝input文本输入框放大组件</title>
<script src="js/jquery.min.js"></script>
<style>
* { margin: 0; padding: 0; border-width: 1px; }
.parentCls {margin:5px 60px 0;}
.js-max-input {border: solid 1px #ffd2b2; position:relative;background: #fffae5;padding: 0 10px 0 10px;font-size:20px;color: #ff4400}
.inputElem4{ width: 300px; height: 36px; border: 1px solid #E0E0E0; padding-left: 10px; line-height: 36px; font-size: 14px; }
</style>
</head>
<body>
<p class="parentCls">
<input type="text" class="inputElem4" autocomplete = "off" maxlength="18"/>
</p>
<script src="js/jq22.js"></script>
<script>
// 初始化
$(function(){
new TextMagnifier({
inputElem: '.inputElem4',
align: 'bottom',
splitType: [6,4,4,4]
});
});
</script>
</body>
</html>/**
* JS 仿支付宝的文本输入框放大组件
*/
function TextMagnifier(options) {
this.config = {
inputElem : '.inputElem', // 输入框目标元素
parentCls : '.parentCls', // 目标元素的父类
align : 'right', // 对齐方式有 ['top','bottom','left','right']四种 默认为top
splitType : [3,4,4], // 拆分规则
delimiter : '-' // 分隔符可自定义
};
this.cache = {
isFlag : false
};
this.init(options);
}
TextMagnifier.prototype = {
constructor: TextMagnifier,
init: function(options) {
this.config = $.extend(this.config,options || {});
var self = this,
_config = self.config,
_cache = self.cache;
self._bindEnv();
},
/*
* 在body后动态添加HTML内容
* @method _appendHTML
*/
_appendHTML: function($this,value) {
var self = this,
_config = self.config,
_cache = self.cache;
var html = '',
$parent = $($this).closest(_config.parentCls);
if($('.js-max-input',$parent).length == 0) {
html += '<p class="js-max-input"></p>';
$($parent).append(html);
}
var value = self._formatStr(value);
$('.js-max-input',$parent).html(value);
},
/*
* 给目标元素定位
* @method _position
* @param target
*/
_position: function(target){
var self = this,
_config = self.config;
var elemWidth = $(target).outerWidth(),
elemHeight = $(target).outerHeight(),
elemParent = $(target).closest(_config.parentCls),
containerHeight = $('.js-max-input',elemParent).outerHeight();
$(elemParent).css({"position":'relative'});
switch(true){
case _config.align == 'top':
$('.js-max-input',elemParent).css({'position':'absolute','top' :-elemHeight - containerHeight/2,'left':0});
break;
case _config.align == 'left':
$('.js-max-input',elemParent).css({'position':'absolute','top' :0,'left':0});
break;
case _config.align == 'bottom':
$('.js-max-input',elemParent).css({'position':'absolute','top' :elemHeight + 4 + 'px','left':0});
break;
case _config.align == 'right':
$('.js-max-input',elemParent).css({'position':'absolute','top' :0,'left':elemWidth + 2 + 'px'});
break;
}
},
/**
* 绑定事件
* @method _bindEnv
*/
_bindEnv: function(){
var self = this,
_config = self.config,
_cache = self.cache;
// 实时监听输入框值的变化
$(_config.inputElem).each(function(index,item){
$(item).keyup(function(e){
var value = $.trim(e.target.value),
parent = $(this).closest(_config.parentCls);
if(value == '') {
self._hide(parent);
}else {
var html = $.trim($('.js-max-input',parent).html());
if(html != '') {
self._show(parent);
}
}
self._appendHTML($(this),value);
self._position($(this));
});
$(item).unbind('focusin');
$(item).bind('focusin',function(){
var parent = $(this).closest(_config.parentCls),
html = $.trim($('.js-max-input',parent).html());
if(html != '') {
self._show(parent);
}
});
$(item).unbind('focusout');
$(item).bind('focusout',function(){
var parent = $(this).closest(_config.parentCls);
self._hide(parent);
});
});
},
/**
* 格式化下
* @method _formatStr
*/
_formatStr: function(str){
var self = this,
_config = self.config,
_cache = self.cache;
var count = 0,
output = [];
for(var i = 0, ilen = _config.splitType.length; i < ilen; i++){
var s = str.substr(count,_config.splitType[i]);
if(s.length > 0){
output.push(s);
}
count+= _config.splitType[i];
}
return output.join(_config.delimiter);
},
/*
* 显示 放大容器
* @method _show
*/
_show: function(parent) {
var self = this,
_config = self.config,
_cache = self.cache;
if(!_cache.isFlag) {
$('.js-max-input',parent).show();
_cache.isFlag = true;
}
},
/*
* 隐藏 放大容器
* @method hide
* {public}
*/
_hide: function(parent) {
var self = this,
_config = self.config,
_cache = self.cache;
if(_cache.isFlag) {
$('.js-max-input',parent).hide();
_cache.isFlag = false;
}
}
};Rendering
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