网站中很多表单都会用到上传图片，logo，照片，用户也会上传图片，这个时候网站就需要一个上传图片的功能，而且在上传后希望能预览一下看上传的对不对。
thinkphp5加layui实现图片上传功能（带图片预览）思路，异步传输图片并预览，将异步上传后的值返回表单隐藏域再提交。
1、引入文件
首先，要引入jquery文件，这是必须的
<link><script></script>
2、html部分
3、功能实现
<script> layui.use(['form','layer','upload'],function(){ $ = layui.jquery; var form = layui.form; layer = layui.layer; var upload = layui.upload; //执行实例 var uploadInst = upload.render({ elem: '#upload_img' //绑定元素 ,url: '/admins.php/admins/video/upload_img' //上传接口 ,accept:'images' ,done: function(res){ //上传完毕回调 $('#pre_img').attr('src',res.msg); $('input[name="img"]').val(res.msg); } ,error: function(){ //请求异常回调 } }); }); // 保存 function save(){ var title = $.trim($('input[name="title"]').val()); var url = $.trim($('input[name="url"]').val()); if(title == ''){ layer.msg('请输入影片名称',{'icon':2,'anim':6}); return; } if(url == ''){ layer.msg('请输入影片地址',{'icon':2,'anim':6}); return; } $.post('/admins.php/admins/video/save',$('form').serialize(),function(res){ if(res.code>0){ layer.msg(res.msg,{'icon':2,'anim':2}); }else{ layer.msg(res.msg,{'icon':1}); setTimeout(function(){parent.window.location.reload();},1000); } },'json'); } </script>
4、后台处理
图片上传
public function upload_img(){ $file = request()->file('file'); if($file==null){ exit(json_encode(array('code'=>1,'msg'=>'没有文件上传'))); } $info = $file->move(ROOT_PATH.'public'.DS.'uploads'); $ext = ($info->getExtension()); if(!in_array($ext,array('jpg','jpeg','gif','png'))){ exit(json_encode(array('code'=>1,'msg'=>'文件格式不支持'))); } $img = '/uploads/'.$info->getSaveName(); exit(json_encode(array('code'=>0,'msg'=>$img))); }
保存内容
public function save(){ $id = (int)input('post.id'); $data['title'] = trim(input('post.title')); $data['channel_id'] = (int)input('post.channel_id'); $data['charge_id'] = (int)input('post.charge_id'); $data['area_id'] = (int)input('post.area_id'); $data['img'] = trim(input('post.img')); $data['url'] = trim(input('post.url')); $data['keywords'] = trim(input('post.keywords')); $data['desc'] = trim(input('post.desc')); $data['status'] = (int)input('post.status'); if($data['title'] == ''){ exit(json_encode(array('code'=>1,'msg'=>'影片名称不能为空'))); } if($data['url'] == ''){ exit(json_encode(array('code'=>1,'msg'=>'影片地址不能为空'))); } if($id){ $this->db->table('video')->where(array('id'=>$id))->update($data); }else{ $data['add_time'] = time(); $this->db->table('video')->insert($data); } exit(json_encode(array('code'=>0,'msg'=>'保存成功'))); }
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