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 rel="stylesheet" type="text/css" href="__STATIC__/plugins/layui/css/layui.css" rel="external nofollow" ><script type="text/javascript" src="__STATIC__/plugins/layui/layui.js"></script>
2、HTML部分
<form class="layui-form"><div class="layui-input-inline"><button class="layui-btn layui-btn-sm" onclick="return false;" id="upload_img"><i class="layui-icon"></i>上传图片</button><img id="pre_img" <?php if($data['item']['img']){echo 'src="'.$data['item']['img'].'"';}?> style="height: 30px;" /><input type="hidden" name="img" value="{$data.item.img}"></div><div class="layui-form-item"><div class="layui-input-block"><button class="layui-btn" onclick="save()">保存</button></div></div></form>3、功能实现
<script type="text/javascript">layui.use(['form','layer','upload'],function(){$ = 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')));}到此这篇关于thinkphp5加layui实现图片上传功能（带图片预览）的文章就介绍到这了,更多相关thinkphp+layui图片上传内容请搜索以前的文章或继续浏览下面的相关文章希望大家以后多多支持！