我正在使用XMLHttpRequest执行ajax请求以显示请求的进度.它与html文件一起运行很好但是evt.lengthComputable用PHP文件返回false.
xhr: function()
{
console.log('xhr');
var xhr = new XMLHttpRequest();
xhr.addEventListener('loadend', uploadComplete, false);
function uploadComplete(event) {
console.log('uploadComplete');
//do stuff
}
//Download progress
xhr.addEventListener("progress", function(evt){
console.log([evt.lengthComputable, evt.loaded, evt.total]);
if (evt.lengthComputable) {
var percentComplete = (evt.loaded / evt.total) * 100;
}
}, false);
return xhr;
}
Thanx帮助:)!
解决方法:
因为PHP文件是动态的,所以需要设置正确的Content-Length标头:
<?
ob_start();
/* your code here */
$length = ob_get_length();
header('Content-Length: '.$length."\r\n");
header('Accept-Ranges: bytes'."\r\n");
ob_end_flush();