thinkphp5加layui实现图片上传功能（带图片预览）

目录

• 1、引入文件
• 2、HTML部分
• 3、功能实现
• 4、后台处理
• 图片上传
• 保存内容

<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>

<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">&#xe67c;</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>

<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>

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)));
}

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')));
}