up_pic_test.js

这是基于jsp的相册管理系统。数据库是mysql

var xmlRequest_uppic = '';
function submitForm()
{//实现提交功能
alert('in up_pic_test.js submitForm()');
	var url = submitEnable();
	xmlRequest_uppic = createXMLHttpRequest();
	//xmlRequest_uppic.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	xmlRequest_uppic.open('post',url);
	xmlRequest_uppic.onreadystatechange = upPicResponse;
	xmlRequest_uppic.send(null);
}
var iCount = 0;
function upPicResponse()
{
 alert('in upPicResponse ' + iCount++);
 alert(xmlRequest_uppic.readyState);
if (xmlRequest_uppic.readyState == 4)
   {
    alert('in state == 2 ' + xmlRequest_uppic.status);
     if (xmlRequest_uppic.status == 200)
     {
       alert('status');
       document.getElementById('message_up_pic').innerHTML = 'ok';
     }
     
   }
   
}

function submitEnable()
{
    var photoType = document.getElementById('photoType').value;
	var photoName = document.getElementById('photoName').value;
	var up_file = document.getElementById('up_file').value;
	if ( !isNotNull(photoType)) 
     {
    	return false;
    }
	if ( !isNotNull(photoName))
     {
    	return false;
    }
	if ( !isNotNull(up_file))
     {
    	return false;
    }
    var url = "doUpload.pho?photoTyp="+photoType+"&photoName="+photoName+"&up_file="+up_file;
   // var content = '';
	return url;
}


//begin showImg
function showImg()
{
	if (!checkImg(document.getElementById('up_file').value))
    {
		//alert('图片格式不识别.请选择gif和jpg格式的图片');//错误出
		document.getElementById('up_form').reset();
		return false;
	}
	
	document.getElementById('img_div').style.display='block'
	document.getElementById('img_show').src= document.getElementById('up_file').value;
	return true;
	
}
function resetAll()
{//清空所有文本框以及与之有关的图片显示
	if(!confirm('确认要全部清空吗?')) 
	{
    	return false;
    }
	document.getElementById('up_form').reset();
	document.getElementById('img_div').style.display='none';
    document.getElementById('img_show').src= '';
    
}

function checkImg(str)
{
	var index = str.lastIndexOf('.') ;
	
	if (index > -1)
	{
		var sub = str.substring(index);
		return match(sub);
	}
	return match(str);
}

function match(str)
{
	str =str.toLowerCase();
	var matchStr = new Array(3);
	matchStr[0]='.gif';
	matchStr[1]='.jpg';
	for (var i=0;i<matchStr.length;i++)
	{
		if (matchStr[i] == str)
		{
		   return true;
		}
	}
	return false;
}

//end checkImg() all


function isNotNull(str)
{ //如果str是非空字符串则返回true;
	if (typeof(str) == 'undefined') return false;
	if (typeof(str) != 'string')return false;
	if (str =='') return false;
	if (str.length < 1) return false;
	return true;
}