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FormData form data submission form and upload image detailed explanation

小云云Original: 2018-03-20 16:12:062853browse

Using the FormData form data object in H5, the name and value of all form elements in the form can be combined into a request string and submitted to the background. You can use some key-value pairs to simulate a series of form controls through js, and you can also use the send() method of XMLHttpRequest to submit the form asynchronously.

<body>
	<p>
		<h2>无刷新方式收集表单数据</h2>
		<form>
			<p>用户名 : <input type="text" name="username" value="jnjk" /></p>
			<p>密 码 : <input type="password" name="password" value="123456" /></p>
			<p>邮 箱 : <input type="text" name="email" value="jnjk@qq.com" /></p>
			<p>头 像 : <input type="file" name="headimg" value="" /></p>
			<img src="" id="headimg" />
			<p style="text-align:center;"><input type="submit"  value="提交" /></p>
		</form>
	</p>
</body>

There are ordinary text characters submitted in the form, and file files submitted. All form field data can be obtained using the FormData object.

<script type="text/javascript">
	var fm = document.getElementsByTagName("form")[0];
	var himg = document.getElementById("headimg");
	fm.addEventListener("submit",function(e){
		//使用 FormData 表单数据对象,收集表单数据
		//var fdata = new FormData(fm);	//收集fm的表单信息
		var fdata = new FormData(this);	//收集fm的表单信息
		
		var xhr = new XMLHttpRequest();
		xhr.onreadystatechange = function(){
			if(xhr.readyState == 4 && xhr.status == 200){
				var msg = xhr.responseText;
				eval("var return_obj = "+msg);		//将返回的json字符串转化为对象
				console.log(return_obj);
				if(return_obj.status){
					himg.setAttribute(&#39;src&#39;,return_obj.data.headimg);
					himg.setAttribute(&#39;style&#39;,&#39;display:block&#39;);
				}else{
					alert(return_obj.data);
				}
			}
		}
		xhr.open(&#39;post&#39;,&#39;data.php&#39;);
		xhr.send(fdata);
		
		e.preventDefault();	//阻止浏览器默认动作
	});
</script>

data.php

<?php

$data = $_POST;					//普通表单域
$file = $_FILES[&#39;headimg&#39;];		//文件上传

if($file[&#39;error&#39;] > 0) exit(json_encode(array(&#39;status&#39;=>0,&#39;data&#39;=>&#39;文件异常&#39;)));

$save_path = &#39;./upload/&#39;.date(&#39;Ymd&#39;).&#39;/&#39;;
if(!is_dir($save_path)){
	mkdir(iconv("GBK","UTF-8",$save_path),0777,true); 
}
$name = $file[&#39;name&#39;];

$true_name = $save_path.$name;
$upres = move_uploaded_file($file[&#39;tmp_name&#39;],$true_name);   //修改文件存储位置
if($upres){
	$data[&#39;headimg&#39;] = $true_name;
	echo json_encode(array(&#39;status&#39;=>1,&#39;data&#39;=>$data));
}else{
	echo json_encode(array(&#39;status&#39;=>0,&#39;data&#39;=>&#39;upload error&#39;));
}

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