日期:2014-05-17 浏览次数:20390 次
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Ajax Progress Bar</title> <script type="text/javascript"> var xmlHttp; var key; var bar_color = 'gray'; var span_id = "block"; var clear = " "; function createXMLHttpRequest() { if (window.ActiveXObject) { xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); } else if (window.XMLHttpRequest) { xmlHttp = new XMLHttpRequest(); } } function goo() { alert("a"); createXMLHttpRequest(); checkDiv(); var url = "ProgressBar.ashx?task=create"; var button = document.getElementById("go"); button.disabled = true; xmlHttp.open("GET", url, true); xmlHttp.onreadystatechange = goCallback; xmlHttp.send(null); alert("a") } function goCallback() { if (xmlHttp.readyState == 4) { if (xmlHttp.status == 200) { setTimeout("pollServer()", 2000); } } } function pollServer() { createXMLHttpRequest(); var url = "ProgressBar.ashx?task=poll&key=" + key; xmlHttp.open("GET", url, true); xmlHttp.onreadystatechange = pollCallback; xmlHttp.send(null); } function pollCallback() { if (xmlHttp.readyState == 4) { if (xmlHttp.status == 200) { var percent_complete = xmlHttp.responseXML.getElementsByTagName("percent")[0].firstChild.data; var index = processResult(percent_complete); for (var i = 1; i <= index; i++) { var elem = document.getElementById("block" + i); elem.innerHTML = clear; elem.style.backgroundColor = bar_color; var next_cell = i + 1; if (next_cell > index && next_cell <= 9) { document.getElementById("block" + next_cell).innerHTML = percent_complete + "%"; } } if (index < 9) { setTimeout("pollServer()", 2000); } else { document.getElementById("complete").innerHTML = "Complete!"; document.getElementById("go").disabled = false; } } } } function processResult(percent_complete) { var ind; if (percent_complete.length == 1) { ind = 1; } else if (percent_complete.length == 2) { ind = percent_complete.substring(0, 1); } else { ind = 9; } return ind; } function checkDiv() { var progress_bar = document.getElementById("progressBar"); if (progress_bar.style.visibility == "visible") { clearBar()