I think I might be going crazy at this point. I had an ASP page working yesterday, and came in today to Firebug telling me it cannot detect the JavaScript on the page. Love it when things change after not touching them.
So I start trying to figure out what is happening. I tried slimming down the code, this answer, restarting Firefox, saving the page under a new name and loading the new one, and adding a ridiculous amount of code I generally consider unnecessary. I even tried removing everything from the page and changing it to this:
<script>
alert("yay");
</script>
Does not trigger alert, and Firebug says "No JavaScript on this page". I've been looking for explanations for almost 2 hours and cannot figure out what is happening. I know I did not deactivate anything because other pages will show JavaScript and function properly. I also know that no add-ons are causing it.
I am using Firefox 28.0 (also tried on 27.0.1). Opening the page in Chrome triggers the alert.
(Damn I meant to post this as a comment).
As you responded I'll re-popualate...
I create jsfiddle,
<body>
<script>
alert("yay");
</script>
</body>
Also ensure your browser has javascript enabled.
You should follow the instructions on the Firebug's first aid page.
I assume it's either some Firebug setting or a conflict with another extension. (I see at least YSlow and FlashFirebug installed.)
To check that you can create a new profile and just install Firebug.
Closing the tab and opening the same link in a new tab seemed to resolve the issue.
I'm not sure if any of the prior attempts factored in, so I will list them as well. To be clear, none of these worked, but may have paved the way in some fashion.
Restarting Firefox
"Clear Activation List" on Firebug
Save page under new filename and load the new page
Uninstalling add-ons (all of them)
Create new profile and load page on that profile
Add a <!DOCTYPE html> to the top
Add type="text/javascript" to script tags
Add charset="utf-8" to script tags
Add <meta charset="utf-8"> in <head>
Related
I'm working on a web application that requires me to use a modalpopup I recently made within a user control. Everything works as expected, but somehow after a PostBack, and not always, the panel used in the modal flickers (blink) on the screen very briefly.
I have read on dozens of forums saying that I needed to add "display:none;" to the style tag of this panel. This usually "helps", and most of the postbacks don't show the panel, but some do. Seems that the property is being ignored somehow, but I can't find where, how, when.
I have also tried debuging the javascript with firebug, tested all page events and even tried taking a look at the ajax modalpopupextender sourcecode, but couldn't fix this issue.
The browser I HAVE to make this web application work is Mozilla Firefox 3.5.10, that is the current version on the company I work for. This can't be changed due to corporate policies.
Due to quality and user experience issues that arise with this flickering, I leave it as is, so if anyone can help me out I'd appreciate that. I'm also on a rather tight schedule, so any quick help will be appreciated too, as I'm ready to try and test changes on the go.
Please let me know of any doubts or questions.
Thanks in advance.
If your CSS is in an external file, it's possible that the HTML is being loaded and rendered before the CSS is downloaded, causing the flicker. If this is the case, then adding style="display:none" directly to the HTML tag ought to fix it.
The following works for me:
<script type="text/javascript">
window.onbeforeunload = function () {
document.getElementById("PanelDialog").style.display = "none";
}
</script>
I have a bookmarklet that launches a window.open javascript function to open a small window with my bookmarklet -- an external feature used to communicate between any visted site and my server. I'd like for a favicon to show up when the bookmarklet is added to the bookmark toolbar. I realize that the bookmarklet is javascript, there is no domain tied to it so it's going to be either difficult or impossible to achieve this goal.
My understanding of the problem:
Favicons are easy to understand, a link within the head of an HTML doc. The browser can pull this when bookmarking an actual site by reference. However, as you see my bookmarklet is ran off a javascript launch code where there exists no HTML, therefor no link to a favicon. I'm not ready to give up yet though, I feel that there's some injection that can be made...
As of now, the bookmarklet launch code looks like this:
Current Script -- bookmarklet, no favicon (note all code is formated with line breaks -- won't work in all browsers, normally its one line)
javascript:void(window.open(
'http://mydomain.com/bookmarklet/form?u='
+encodeURIComponent(location.href)+
't='+encodeURIComponent(document.title),
'test','status=0,toolbar=0,location=0,menubar=0,
resizable=false,scrollbars=false,height=379,width=379'
));
The closest thing I've found to a solution is as follows, but it doesn't open a new window -- just creates a new tab with the html as the page:
Working favicon, no bookmarklet window
javascript:'<!DOCTYPE html>
<html><head>
<title>Hello World</title>
<link rel="icon" type="image/png" href="http://www.tapper-ware.net/devel/js/JS.Bookmarklets/icons/next.png" />
</head>
<body>Hello World</body>
</html>';
I have tried a combination of the two but it didn't seem to use the icon. I'd be curious to know if anyone can see a type of workaround.. I think it could be possible, I just don't think it's set up correctly as I've been trying.
My hybrid of the two -- bookmarklet but no favicon
javascript:'<!DOCTYPE html>
<html><head>
<title>Hello World</title>
<link rel="icon" type="image/png" href="http://www.tapper-ware.net/devel/js/JS.Bookmarklets/icons/next.png" />
</head><body>Hello World</body></html>';
window.open('http://mydomain.com/bookmarklet/form?u='
+encodeURIComponent(location.href)+
'&t='+encodeURIComponent(document.title),
'test',
'status=0,toolbar=0,location=0,menubar=0,resizable=false,
scrollbars=false,height=379,width=379').void(0);
What I did was use the html structure before firing window.open(), this successfully opened my bookmarklet in a new window, but no favicon showed up for the bookmark icon.
Logical Solution:
My thoughts on this would be to have the bookmarklet point to a page that is simply an HTML file with a favicon link and the launch script in the <head>. However, I don't want this opening in a new tab with a blank HTML file that then launches a popup.. Workaround..?
There exists a similar question but I did not seem to find the answer I'm looking for:
How to have favicon / icon set when bookmarklet dragged to toolbar?
Source for the working javascript favicon (no bookmarklet however):
http://www.tapper-ware.net/blog/?p=97
I'd be interested in what your current knowledge/thoughts on this would be
I tried and retried, and my first conclusion was: "It can't be done (at least not in FF4 on Ubuntu 11.04)". You need (I guess) a simple solution for your site visitors (drag&drop, add bookmark with 1 click ...).
I have found a workaround, it does it's job, but it is a little buggy (maybe someone can help fix it).
PROS:
add a icon to the bookmarklet
it uses windows.open
doesn't leave empty pages behind
CONS:
it reloads the current page (instead of leave a page behind)
Can't make Firefox POP-ul blocker allow "javascript:" generated HTML page to load POP-ups, so you need to hit allow every time
This is the code:
Bookmarklet
This is a link that you put on your page, the user needs to drag&drop this link to the bookmark bar (you can use something like Add Bookmark Script for adding it as a bookmark with 1 click), The bookmark has no icon until the user click's it at least once.
So how it supose to work:
1. redirect the user to the generated HTML page from the bookmarklet (that makes the ICON posible)
2. onLoad open the window you need using "windows.open"
3. redirect the page back using "history.back(-1)"
In theory everithing happens so fast, that the user does't see the new page, just that the current page is reloading, and a new windows appear.
The problem:
1. I use setTimeout for history.back beacause window.open is blocked by Firefox, so I need to click allow every single time (if somebody can fix this ... we have a chance of using this, develop it further :) )
I know THIS is not a reliable solution, but this is the only solution I've got so far.
Hope this helps a little. :)
Some of the things that I've tried that might possibly get you going a bit more:
Append a new link element to the current document:
javascript: var newLink = document.createElement('link');
newLink.setAttribute('rel','icon');
newLink.setAttribute('type','image/png');
newLink.setAttribute('href','http://www.tapper-ware.net/devel/js/JS.Bookmarklets/icons/next.png');
document.querySelector('head').appendChild(newLink);
void(0);
Note that I was using the querySelector due to IE testing (though works in modern browsers as well). With Chrome and FF, I kept getting invalid character when trying to create the element, so I had to do piecewise attribute setting.
Tried using base64 encoded image string using the "data:image/png;base64,iVBORw0KGgoAAAA..." URI schema, but that didn't help anything due to the fact that I still had to set it to the current HTML text (which I could do, but ran into the same problem as you above of no bookmarklet).
Maybe this can't be done due to cross site scripting concerns? Not sure... Either way, really curious to see what you come up with (if you manage to come up with anything).
"I don't want this opening in a new tab with a blank HTML file that then launches a popup.. Workaround..?"
If what you after really is the visual effect, you can try launch the blank HTML in hidden iframe, then launch the javascript.
Hope that helps
I have a situation where I'm inserting javascript generated HTML code into a DIV. One would think this would be a no brainer, but for some reason, once the code is in, the status bar and tab loading graphics start up in both browsers and never stop again. The page continually appears to be loading data, but in reality, there's nothing more to load. Any idea why this may be happening? Solutions? I appreciate any help. Thanks!
Install the Firebug plug-in for Firefox. Open it up and got to the NET tab. That will allow you to see your network activity. Something on the server may be stalling. This will help you find it.
When I open Developer Tools in Google Chrome, I see all kinds of features like Profiles, Timelines, and Audits, but basic functionality like being able to set breakpoints both in js files and within html and javascript code is missing! I tried to use the javascript console, which itself is buggy - for example, once it encounters a JS error, I cannot get out of it unless I refresh the whole page. Can someone help?
Are you talking about code within <script> tags, or in the HTML tag attributes, like this?
Click
Either way, the debugger keyword like this will work:
Click
N.B. Chrome won't pause at debuggers if the dev tools are not open.
You can also set property breakpoints in JS files and <script> tags:
Click the Sources tab
Click the Show Navigator icon and select the a file
Double-click the a line number in the left-hand margin. A corresponding row is added to the Breakpoints panel (4).
Use the sources tab, you can set breakpoints in JavaScript there. In the directory tree underneath it (with the up and down arrow in it), you can select the file you want to debug. You can get out of an error by pressing resume on the right-hand side of the same tab.
You also can give a name to your script:
<script>
... (your code here)
//# sourceURL=somename.js
</script>
ofcourse replace "somename" by some name ;) and then you will see it in the chrome debugger at "Sources > top > (no domain) > somename.js" as a normal script and you will be able to debug it like other scripts
Refresh the page containing the script whilst the developer tools are open on the scripts tab. This will add a (program) entry in the file list which shows the html of the page including the script. From here you can add breakpoints.
Another intuitive simple trick to debug especially script inside html returned by ajax, is to temporary put console.log("test") inside the script.
Once you have fired the event, open up the console tab inside the developer tools.
you will see the source file link shown up at the right side of the "test" debug print statement. just click on the source (something like VM4xxx) and you can now set the break point.
P.S.: besides, you can consider to put "debugger" statement if you are using chrome, like what is being suggested by #Matt Ball
My situation and what I did to fix it:
I have a javascript file included on an HTML page as follows:
Page Name: test.html
<!DOCTYPE html>
<html>
<head>
<script src="scripts/common.js"></script>
<title>Test debugging JS in Chrome</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<div>
<script type="text/javascript">
document.write("something");
</script>
</div>
</body>
</html>
Now entering the Javascript Debugger in Chrome, I click the Scripts Tab, and drop down the list as shown above. I can clearly see scripts/common.js however I could NOT see the current html page test.html in the drop down, therefore I could not debug the embedded javascript:
<script type="text/javascript">
document.write("something");
</script>
That was perplexing. However, when I removed the obsolete type="text/javascript" from the embedded script:
<script>
document.write("something");
</script>
..and refreshed / reloaded the page, voila, it appeared in the drop down list, and all was well again.
I hope this is helpful to anyone who is having issues debugging embedded javascript on an html page.
I was having the same problem too, how to debug JavaScript that is inside <script> tags. But then I found it under the Sources tab, called "(index)", with parenthesis. Click the line number to set breakpoints.
This is Chrome 71.
Adding debugger; on top at my script worked for me.
I know the Q is not about Firefox but I did not want to add a copy of this question to just answer it myself.
For Firefox you need to add debugger; to be able to do what #matt-ball suggested for the script tag.
So on your code, you add debugger above the line you want to debug and then you can add breakpoints. If you just set the breakpoints on the browser it won't stop.
If this is not the place to add a Firefox answer given that the question is about Chrome. Don't :( minus the answer just let me know where I should post it and I'll happily move the post. :)
If you cannot see the "Scripts" tab, make sure you are launching Chrome with the right arguments. I had this problem when I launched Chrome for debugging server-side JavaScript with the argument --remote-shell-port=9222. I have no problem if I launch Chrome with no argument.
I came across this issue, however my inline function was withing an angularJS view. Therefore on the load i could not access the inline script to add the debug, as only the index.html was available in the sources tab of the debugger.
This meant that when i was opening the particular view with my inline (had no choice on this) it was not accessible.
The onlly way i was able to hit it was to put an erroneous function or call inside the inline JS function.
My solution included :
function doMyInline(data) {
//Throw my undefined error here.
$("select.Sel").debug();
//This is the real onclick i was passing to
angular.element(document.getElementById(data.id)).scope().doblablabla(data.id);
}
This mean when i clicked on my button, i was then prompted in the chrome consolse.
Uncaught TypeError: undefined is not a function
The important thing here was the source of this : VM5658:6 clicking on this allowed me to step through the inline and hold the break point there for later..
Extremely convoluted way of reaching it.. But it worked and might prove useful for when dealing with Single page apps which dynamically load your views.
The VM[n] has no significant value, and the n on equates to the script ID. This info can be found here : Chrome "[VM]"
Using Visual Studio (2012) I had the same issue and switching to IIS Express solved the problem!
The script tag's type attribute did not factor into it.
For some reason the Visual Studio Development Server does not provide everything Chrome needs to enable the breakpoints.
This is an extension of Rian Schmits' answer above. In my case, I had HTML code embedded in my JavaScript code and I couldn't see anything other than the HTML code. Maybe Chrome Debugging has changed over the years but right-clicking the Sources/Sources tab presented me with Add folder to workspace. I was able to add my entire project, which gave me access to all of my JavaScripts. You can find more detail in this link. I hope this helps somebody.
You have to add type="text/javascript" to the script blocks for them to be picked up as script. For example:
<script type="text/javascript"> ...your code here... </script>
for someone like me: just want to
(add breakpoint to) debug normal js code
<script> ... </script> inside/embedded html
Steps:
Sources -> Page -> Top -> find your html -> click -> right side show html and js script -> add breakpoint -> debug
I want to debug a javascript file that is embedded in the HEAD element.
I navigate to the site, see the code, and make a breakpoint:
(source: deviantsart.com)
But when I click on Reload, the script disappears and it doesn't stop at the breakpoint:
(source: deviantsart.com)
Debugging was working earlier so I know it works in general. What do I have to do so that Firebug always debugs my script?
I've noticed this behaviour before as well. It seems that it can happen if you refresh the page while the debugger is running (i.e. after you've hit your breakpoint and are stepping through code). This is far from conclusive, just something I've casually observed over time.
Also, I try to avoid having multiple tabs open with firebug active, as it seems to get confused.
Edit: just thought I'd add that I've seen this manifest itself in a few different ways:
the external script file does not appear at all in the scripts panel.
the external script file appears but firebug doesn't "see" it. You know this has happened because the line numbers beside the code where a breakpoint can be set won't be highlighted (used to be green but now appear to be just a darker shade than other lines). I've seen this happen with inline javascript on a HTML page (horrors!) as well.
the external script file is there, but you can only see a single screen full of code. Where "screen full" is the firebug panel viewport.
shut down firefox and then restart. sometimes firebug gets confused. also make sure you have the latest version.
You need activate the script tab
I'm not sure that having a <script> inside <head> (as opposed to, inside <body>) is actually legal HTML. If it's not, as I suspect, you can't fault Firebug for not supporting it well...!-)
The bugs in script processing that I know about are 1) jquery dynamic loading of scripts fails, 2) new Function() cannot be seen, 3) some kinds of document.write() cannot be seen.
Firebug processes script files in series with Firefox. This means that Firebug must be active when the page loads and it means that any exception in the path will cause the files to be mis-processed. If you opened firebug before loading and you still see problems, then the most likely fix is to install Firebug in a new Firefox profile. This causes you to get a completely fresh set of default options and you run Firebug without other extensions. As you re-add other extensions, look for problems in seeing scripts: then maybe you will discover what extension is interfering with the code path for processing scripts. I know this is a pain in the neck, but so is JS debugging without source ;-). We are working on testing with more Firebug and Firefox extensions installed to try to reduce these problems.
In our case it was the bundling of JS files.
It is not only FireFox, it is same for Chrome.
We moved the file out of the bundle and put it on the page where it needed to be referenced and it started working like charm.