Home php教程 PHP源码 PHP判断file框是否已选择文件(支持多文件)

PHP判断file框是否已选择文件(支持多文件)

Jun 08, 2016 pm 05:22 PM
file input quot

本例子要告诉你几种处理办法,一是用js 或者是jquery遍历判断,另一种是传给php之后利用tmp_name值来判断,方法都简单下面我们一起来看看。

<script>ec(2);</script>

单个表单时

 代码如下 复制代码



文件上传:


//判断pic文件框是否已经选择文件
if (!empty($_FILES['file']['tmp_name'])) {
echo '已选择文件';
}else {
echo '请选择文件';
}
//PS:$_FILES后面的['tmp_name']一定不要忘写,它表示是一个临时的意思
?>

当然这个可以先用JS去判断一下,方法如下:

 代码如下 复制代码

<script><br /> var send=document.getElementById("send");<br /> send.onclick=function() {<br /> var file=document.getElementById("file").value;<br /> if (file.length<1) {<br /> alert('请选择图片');<br /> return false;<br /> }<br /> }<br /> </script>

多文件上传时


表单中有多个
提交表单时需要判断其中至少要有一个input已经选择好文件。

 代码如下 复制代码









使用jQuery进行判断:

 代码如下 复制代码

var fileFlag = false;
$("input[name='uploadfile']").each(function(){
if($(this).val()!="") {
fileflag = true;
return false;
}
});
if(fileFlag) {
alert("已有选择好文件的");
}

只要fileFlag为true,就可以退出each循环,不需要再对剩下的input进行判断。
在each中使用return false退出循环,使用return true结束当前次循环,进行下一次循环。

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