XMLHttpRespone is empty and status 0

Question 1

I am trying to parse XML document from java script with the below code

var xhr = new XMLHttpRequest();
 xhr.onreadystatechange = function () {
 if (this.responseXML != null) {
 Caption(this.video, this.responseXML);
 } else {
 throw new Error("Can't read resource");
 }
 };
 xhr.video = obj;
 xhr.open("GET", "Br001.xml", true);
 xhr.send("");

But I am getting status=0 and responseXML = NULL.

FollowUp:

After changing the onreadystatechange as below i am getting readyState=1 and status=0 and responsexml=NULL and getting only one callback

xhr.onreadystatechange = function () {
 if (this.readyState == 4
 && this.status == 200) {
 if (this.responseXML != null) {
 Caption(this.video, this.responseXML);
 } else {
 throw new Error("Can't read resource");
 }
 }
};

Question 2

readyState goes through multiple stages before the response is available. You have to wait for readyState to change to 4:

xhr.onreadystatechange = function () {
 if (this.readyState === 4) {
 if (this.responseXML != null) {
 Caption(this.video, this.responseXML);
 } else {
 throw new Error("Can't read resource");
 }
 }
};

It's also best to check status (e.g., to make sure it's 200 <= status < 300 (as 2xx are the "ok" responses), although your this.responseXML != null is probably good enough for this use.

Question 3

@BrunoLM: Thanks. Feel free to just jump in on those.

Question 4

@T.JCrowder Please check the question, i have edited.

Question 5

@akshay: If you're doing this loading the file from your local drive (e.g., file://... rather than http://... or https://...), most browsers disallow ajax calls from file://... resources.

Question 6

I found the problem. Its with the path name. now getting readyState=4

T.J. Crowder 1.1m201 gold badges2k silver badges2k bronze badges · Accepted Answer · 2013-12-21 14:56:23Z

3

readyState goes through multiple stages before the response is available. You have to wait for readyState to change to 4:

xhr.onreadystatechange = function () {
 if (this.readyState === 4) {
 if (this.responseXML != null) {
 Caption(this.video, this.responseXML);
 } else {
 throw new Error("Can't read resource");
 }
 }
};

It's also best to check status (e.g., to make sure it's 200 <= status < 300 (as 2xx are the "ok" responses), although your this.responseXML != null is probably good enough for this use.

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edited Dec 21, 2013 at 15:03

answered Dec 21, 2013 at 14:56

T.J. Crowder's user avatar

T.J. Crowder

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4 Comments

T.J. Crowder

T.J. Crowder Over a year ago

@BrunoLM: Thanks. Feel free to just jump in on those.

2013年12月21日T15:00:02.107Z+00:00

akshay

akshay Over a year ago

@T.JCrowder Please check the question, i have edited.

2013年12月21日T15:10:21.893Z+00:00

T.J. Crowder

T.J. Crowder Over a year ago

@akshay: If you're doing this loading the file from your local drive (e.g., file://... rather than http://... or https://...), most browsers disallow ajax calls from file://... resources.

2013年12月21日T15:17:23.943Z+00:00

akshay

akshay Over a year ago

I found the problem. Its with the path name. now getting readyState=4

2013年12月21日T15:23:26.62Z+00:00

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