How to make this code work ...
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Ben Duncan
Jun 4, 2019, 3:23:11 PM6/4/19
to Web2py
Ok, the following is code from w3 schools:
The code is as follows :
<!DOCTYPE html>
<html>
<body>
<div id="demo">
<h2>The XMLHttpRequest Object</h2>
<button type="button" onclick="loadDoc()">Change Content</button>
</div>
<script>
function loadDoc() {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("demo").innerHTML =
this.responseText;
}
};
xhttp.open("GET", "ajax_info.txt", true);
xhttp.send();
}
</script>
</body>
</html>
<html>
<body>
<div id="demo">
<h2>The XMLHttpRequest Object</h2>
<button type="button" onclick="loadDoc()">Change Content</button>
</div>
<script>
function loadDoc() {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("demo").innerHTML =
this.responseText;
}
};
xhttp.open("GET", "ajax_info.txt", true);
xhttp.send();
}
</script>
</body>
</html>
The question is how do I get this code to run under web2py ?
Thanks ...
Ben Duncan
DBA / Chief Software Architect
Mississippi State Supreme Court
Electronic Filing Division
Anthony
Jun 4, 2019, 5:35:09 PM6/4/19
to web2py-users
What are you trying to do? That code should work fine in web2py, as it's just Javascript. You just need to have it call a web2py URL. Of course, web2py includes some built-in mechanisms for handling Ajax requests, such as the ajax() Javascript function and the LOAD() helper to create Ajax components.
Anthony
Ben Duncan
Jun 4, 2019, 6:16:12 PM6/4/19
to Web2py
I've been trying to run it ... When you click on the button it does nothing
Ben Duncan
DBA / Chief Software Architect
Mississippi State Supreme Court
Electronic Filing Division
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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Dave S
Jun 4, 2019, 9:00:44 PM6/4/19
to web2py-users
On Tuesday, June 4, 2019 at 3:16:12 PM UTC-7, Ben Duncan wrote:
I've been trying to run it ... When you click on the button it does nothingBen DuncanDBA / Chief Software ArchitectMississippi State Supreme CourtElectronic Filing Division
When I replace the "ajax-info.txt" with a real URL (that is, one for a web2py function on my server, and which returns a txt file), I see the network access, including a response with HTTP status 303. For some reason (cookie management?) it doesn't work for me to login via a separate tab, and each time I click the button I get a different cookie. I've been poking at sending credentials, but I still get the 303 response and I apparently am not setting the Authorization header as I think I am, but only setting Access-Control-Request-Headers to "authorization". And there is also "allow origin" issues, because file://tmp/test.html comes from a different address than the server.
HTH
/dps
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Dave S
Jun 4, 2019, 9:18:18 PM6/4/19
to web2py-users
$
On Tuesday, June 4, 2019 at 6:00:44 PM UTC-7, Dave S wrote:
On Tuesday, June 4, 2019 at 3:16:12 PM UTC-7, Ben Duncan wrote:I've been trying to run it ... When you click on the button it does nothingBen DuncanDBA / Chief Software ArchitectMississippi State Supreme CourtElectronic Filing Division
When I replace the "ajax-info.txt" with a real URL (that is, one for a web2py function on my server, and which returns a txt file), I see the network access, including a response with HTTP status 303. For some reason (cookie management?) it doesn't work for me to login via a separate tab, and each time I click the button I get a different cookie. I've been poking at sending credentials, but I still get the 303 response and I apparently am not setting the Authorization header as I think I am, but only setting Access-Control-Request-Headers to "authorization". And there is also "allow origin" issues, because file://tmp/test.html comes from a different address than the server.
HTH
/dps
The cross-site and authorization issues go away when you host the file on the server (say, .../applications/myapp/static/test.html)
/dps
Val K
Jun 5, 2019, 1:11:43 AM6/5/19
to web2py-users
Try xhttp.withCredentials = true
Dave S
Jun 5, 2019, 5:05:36 AM6/5/19
to web2py-users
On Tuesday, June 4, 2019 at 10:11:43 PM UTC-7, Val K wrote:
Try xhttp.withCredentials = true
I did. The tricky part is that using a file on the browser's host, the first request is OPTIONS.
/dps
Val K
Jun 5, 2019, 6:30:46 AM6/5/19
to web2py-users
Yes, file:// is even another protocol, so using http transport in this case is out of all standards. But it should work fine with regular web2py app (over http)
Ben Duncan
Jun 5, 2019, 8:54:23 AM6/5/19
to Web2py
Put some console logs in to see ....strange ...
This site makes use of a SHA-1 Certificate; it’s recommended you use certificates with signature algorithms that use hash functions stronger than SHA-1.
In function loaddoc loadajax:14:11
readystate= 1 loadajax:18:11
status= 0 loadajax:19:11
This site makes use of a SHA-1 Certificate; it’s recommended you use certificates with signature algorithms that use hash functions stronger than SHA-1.
readystate= 2 loadajax:18:11
status= 404 loadajax:19:11
readystate= 3 loadajax:18:11
status= 404 loadajax:19:11
readystate= 4 loadajax:18:11
status= 404
ajax_info is just a text file that Iv'e created that looks like :
<p>Ajax is not a programming language</p>
<p>
<h1>AJAX</h1>
AJAX IS A technique for accessing webs ervers from a web page
</p>
<p>AJAX stands for ASYNCHRONOUS Javascript and XML/JSON</p>
<p>
<h1>AJAX</h1>
AJAX IS A technique for accessing webs ervers from a web page
</p>
<p>AJAX stands for ASYNCHRONOUS Javascript and XML/JSON</p>
Ben Duncan
DBA / Chief Software Architect
Mississippi State Supreme Court
Electronic Filing Division
On Wed, Jun 5, 2019 at 5:30 AM Val K <valq...@gmail.com> wrote:
Yes, file:// is even another protocol, so using http transport in this case is out of all standards. But it should work fine with regular web2py app (over http)
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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Dave S
Jun 5, 2019, 3:45:00 PM6/5/19
to web2py-users
And where did you put the file? From the 404, it wasn't where your server-side was looking for it.
My file was in the myapp/uploads directory, and I had "download/" in the URL (the fun things at the bottom of controllers/default.py work for me pretty much without change).
(I moved the test html+javascript into static, and explicitly loaded it it with "myapp/static/test.html". Putting it on the server got rid of the xsite issues.)
/dps
On Wed, Jun 5, 2019 at 5:30 AM Val K <valq...@gmail.com> wrote:
Yes, file:// is even another protocol, so using http transport in this case is out of all standards. But it should work fine with regular web2py app (over http)
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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Dave S
Jun 5, 2019, 3:47:51 PM6/5/19
to web2py-users
On Wednesday, June 5, 2019 at 3:30:46 AM UTC-7, Val K wrote:
Yes, file:// is even another protocol, so using http transport in this case is out of all standards. But it should work fine with regular web2py app (over http)
Since I found a way to successfully demonstrate the javascript working, it is quite possible I will not ever pursue the file:// x-site issues. I've done OPTIONS handling in node.js before, and I think I can see how to do it in the front end (nginx), but I don't have a reason to pursue it at present.
/dps
Dave S
Jun 5, 2019, 10:51:02 PM6/5/19
to web2py-users
Although looking through some of my long-open tabs, I see mcm's cors_origin decorator from October '16, and curiosity might provoke me.
-d
Ben Duncan
Jun 6, 2019, 8:03:54 AM6/6/19
to Web2py
Ok, moving it to static makes it work fine. It was in view/default
Any IDEAS on what / why this works this way ?
Thanks ...
Ben Duncan
DBA / Chief Software Architect
Mississippi State Supreme Court
Electronic Filing Division
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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Dave S
Jun 6, 2019, 3:52:16 PM6/6/19
to web2py-users
On Thursday, June 6, 2019 at 5:03:54 AM UTC-7, Ben Duncan wrote:
Ok, moving it to static makes it work fine. It was in view/defaultAny IDEAS on what / why this works this way ?Thanks ...Ben DuncanDBA / Chief Software ArchitectMississippi State Supreme CourtElectronic Filing Division
View isn't really a typical search path ... it's tied to the controller/function naming system.
/dps
On Wed, Jun 5, 2019 at 9:51 PM Dave S <snide...@gmail.com> wrote:
--
On Wednesday, June 5, 2019 at 12:47:51 PM UTC-7, Dave S wrote:
On Wednesday, June 5, 2019 at 3:30:46 AM UTC-7, Val K wrote:Yes, file:// is even another protocol, so using http transport in this case is out of all standards. But it should work fine with regular web2py app (over http)
Since I found a way to successfully demonstrate the javascript working, it is quite possible I will not ever pursue the file:// x-site issues. I've done OPTIONS handling in node.js before, and I think I can see how to do it in the front end (nginx), but I don't have a reason to pursue it at present.
/dps
Although looking through some of my long-open tabs, I see mcm's cors_origin decorator from October '16, and curiosity might provoke me.
-d
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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