layer弹出窗口在弹出时指定了area，弹出后，如果当前页面（iframe）大小比弹出的窗口小，那么就会出现无法操作弹出窗口的尴尬情况。如图:
弹出窗口比当前页面大,这时，唯有放大整个页面才能看到完全的弹出窗口，才可以操作。
layui 为我们提供了 layer.style(); 方法来重新跳整窗口的大小 , 然后我们只需要写一个函数,得到当前document的宽度和高度, 判断弹出框是否大于document来调整窗口大小
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <link rel="stylesheet" href="layui/css/layui.css" media="all"> </head> <body> <button id="dianji">点击</button> <form class="layui-form" action="" id="id"> <div class="layui-form-item"> <label class="layui-form-label">单行输入框</label> <div class="layui-input-block"> <input type="text" name="title" lay-verify="title" autocomplete="off" placeholder="请输入标题" class="layui-input"> </div> </div> <div class="layui-form-item"> <label class="layui-form-label">验证必填项</label> <div class="layui-input-block"> <input type="text" name="username" lay-verify="required" lay-reqtext="用户名是必填项，岂能为空？" placeholder="请输入" autocomplete="off" class="layui-input"> </div> </div> <div class="layui-form-item"> <div class="layui-inline"> <label class="layui-form-label">验证手机</label> <div class="layui-input-inline"> <input type="tel" name="phone" lay-verify="required|phone" autocomplete="off" class="layui-input"> </div> </div> <div class="layui-inline"> <label class="layui-form-label">验证邮箱</label> <div class="layui-input-inline"> <input type="text" name="email" lay-verify="email" autocomplete="off" class="layui-input"> </div> </div> </div> </form> <script src="layui/layui.all.js"></script> <script type="text/javascript"> var layerIndex; var layerInitWidth; var layerInitHeight; var $; layui.use([‘form‘, ‘jquery‘], function () { var form = layui.form; $ = layui.jquery; $("#dianji").click(function () { layer.open({ type: 1, area: [‘500px‘, ‘900px‘], content: $(‘#id‘), //这里content是一个DOM，注意：最好该元素要存放在body最外层，否则可能被其它的相对元素所影响 btn: [‘按钮一‘, ‘按钮二‘, ‘按钮三‘] , yes: function (index, layero) { //按钮【按钮一】的回调 } , btn2: function (index, layero) { //按钮【按钮二】的回调 //return false 开启该代码可禁止点击该按钮关闭 } , btn3: function (index, layero) { //按钮【按钮三】的回调 //return false 开启该代码可禁止点击该按钮关闭 } , cancel: function () { //右上角关闭回调 //return false 开启该代码可禁止点击该按钮关闭 }, success: function (layero, index) { //获取当前弹出窗口的索引及初始大小 layerIndex = index; layerInitWidth = $("#layui-layer" + layerIndex).width(); layerInitHeight = $("#layui-layer" + layerIndex).height(); resizeLayer(layerIndex, layerInitWidth, layerInitHeight); form.render(); } }); }) }); function resizeLayer(layerIndex, layerInitWidth, layerInitHeight) { var windowWidth = $(document).width(); var windowHeight = $(document).height(); var minWidth = layerInitWidth > windowWidth ? windowWidth : layerInitWidth; var minHeight = layerInitHeight > windowHeight ? windowHeight : layerInitHeight; console.log("win:", windowWidth, windowHeight); console.log("lay:", layerInitWidth, layerInitHeight); console.log("min:", minWidth, minHeight); layer.style(layerIndex, { top: 0, width: minWidth, height: minHeight }); } </script> </body> </html>
效果图:
原文：https://www.cnblogs.com/yysbolg/p/11371438.html