| objet |
01-31-2012 08:38 PM |
why readyState equal to zero
Hi,
the line 95
Code:
if (xhr.readyState == 4) {
equal to zero in function setWord();
1 - why ?
2 - did the browser run the code and when it come to line 95
it run but just one time if readyState equal to 4 the browser
continue successfully else (readyState equal to 0-3 ) then the browser will skip it and not wait to readyState parameter that will be equal to 4
Thanks :mad:;
the code:
Code:
var str = "";
var getString = "";
var tempDiv = "";
var newWord = "";
var xhr = false;
var url = "Favorite_Word.xml";
var msg = "";
var i,a;
function initAll() {
str = document.getElementById("word").value;
document.getElementById("word").className = "";
if (str != ""){
i = str.length;
a = i;
getstring = "";
tempDiv = "";
newWord = "";
checkFullInputField();
}
}
function checkFullInputField(){
if_There_Request_XML();
if (newWord!=""){
while (i>0&&i<=mycars[0].length)
{
msg ="i:=" + i + "' a=i:=" + a;popmenu();
if (str[a-i].toLowerCase()== mycars[0][a-i].toLowerCase())
{msg ="a - i= " + (a-i) + " ," + "i:= " + i + " " + " ,First str="+ str[a-i];popmenu();
getstring=getstring+str[a-i].toLowerCase();
i--;}
else {msg ="you are in else i:= " + i;popmenu();i=-5;}
}
if (i==0){msg = "inputfield.getstring=" + getstring;popmenu();}
else {msg = "inputfield.getstring=" + getstring + "<br />"+"inputfield_str_1:" + str.substring(0,getstring.length);popmenu();}
}
}
function popmenu(){
document.getElementById("popups").innerHTML = "";
var tempDiv = document.createElement("div");
tempDiv.innerHTML = msg;
tempDiv.className = "suggestions";
document.getElementById("popups").appendChild(tempDiv);
}
function if_There_Request_XML(){
getHTTPObject();
alert("There is xhr :=2");
if (xhr) {
xhr.onreadystatechange = setWord();
xhr.open("GET", url, true);
xhr.send(null);
alert("There is if xhr :=6");
}
else {
alert("Sorry, but I couldn't create an XMLHttpRequest");
}
}
function getHTTPObject()
{
if (window.XMLHttpRequest) {
xhr = new XMLHttpRequest();
alert("There is getHTTPObject firefox:=1");
}
else {
if (window.ActiveXObject) {
try {
xhr = new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e) { }
}
}
}
function setWord() {
var Node1 = "student";
var Node2 = "name";
if (xhr.readyState == 4) {
if (xhr.status == 200) {
if (xhr.responseXML) {
var wordData = xhr.responseXML.getElementsByTagName(Node1);
alert("wordData:=" + wordData + ":=5 " );
newWord = wordData[0].getElementsByTagName(Node2)[0].firstChild.nodeValue;
alert("newWord:=" + newWord );
}
}
}
else {
alert("There was a problem with the request " + xhr.status + ":=3 4");
}
}
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