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Everytime I think about using JavaScript (or any JS library) I see this red light in front of me. My only concern as usual is IE. So here is what I want to know:
1) Is JavaScript disabled by default in IE8 or IE9?
2) What about you, do you feel safe when including a JavaScript code in a site that may be viewed using IE 8 or 9?
3) I found so many problems when applying CSS rules to html5 tags in IE8 so I used Modernizr. However it depends on JavaScript to enable html5 tags so I could apply CSS rules to them in IE. Am I risking to lose CSS styling as well, by using Modernizr?
No JavaScript is not disabled by default in IE8/IE9
Yes I feel safe, because I code defensively with those browsers in mind if they're mentioned as requirements in the project spec.
Again, code for your requirements. If you have a real reason to believe that modernizr isn't going to cover your requirements, don't use it and style accordingly.
1) No, it is enabled by default
2) Safety is not a concern for you in that case. Nowadays, modern Javscript libraries even support IE quite well. They often implement workarounds for features not supported by IE, so that users just can't use all features the libraries has, but the scripts shouldn't crash any more.
That said, you still need to test your sites in IE.
Javascript has become a widely accepted standard finally.
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I learnt that the JavaScript syntax document.<a_form_name> is IE proprietary syntax (instead of document.forms.<a_form_name>). (reference: https://developer.mozilla.org/en-US/docs/Archive/Using_Web_Standards_in_your_Web_Pages/Using_the_W3C_DOM)
There are more other proprietary or dialect syntax, methods or functions on JavaScript/CSS/HTML.
Most of the dialects are works fine in latest browsers, but I think clean code is better for future maintenance.
I could not find the lint checker to notice the problems like that.
Do you have some tools or methodology to avoid or minimize the dialect from the JavaScript code?
You can use libraries such as jquery to manage browser compatibility.
Checkout more details on this website: https://developer.mozilla.org/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing/JavaScript
Some snippet from aforementioned website:
Historically, JavaScript was plagued with cross-browser compatibility
problems — back in the 1990s, the main browser choices back then
(Internet Explorer and Netscape) had scripting implemented in
different language flavours (Netscape had JavaScript, IE had JScript
and also offered VBScript as an option), and while at least JavaScript
and JScript were compatible to some degree (both based on the
ECMAScript specification), things were often implemented in
conflicting, incompatible ways, causing developers many nightmares.
Such incompatibility problems persisted well into the early 2000s, as
old browsers were still being used and still needed supporting. This
is one of the main reasons why libraries like jQuery came into
existence — to abstract away differences in browser implementations
(e.g. see the code snippet in How to make an HTTP request) so
developers only have to write one simple bit of code (see
jQuery.ajax()). jQuery (or whatever library you are using) will then
handle the differences in the background, so you don't have to.
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I made a site using a template someone else purchased and I made modifications to it quickly and uploaded it splurg .co
I am working on the live app and have been away from webDev for a while and would love to know why on my system in three different browsers the page seems to react differently. And what I can do to figure out how to fix each page / or my setup ?
the page in question and on my chrome does not show a backgoround image and in firefox it renders.
I am curious on how I can figure this out myself, I've look at dev tools and it appears to get the image just never loads it.
Since I checked the site at work using chrome ( and it worked there ) I added an screenshot, since it seems to just fail on my own personal system and no where else ?
This is a very common issue with different browsers. A google search on cross browser compatibility will give you a lot of reading material as well as resources to help solve the issue. Different browsers use different parsers and rendering engines. As such, different browsers yield different results of the same website. That is why IE is one of the most hated browsers by web developers. It usually has to do with CSS. For example, some CSS properties are not honored in certain browsers and sometimes you have to prefix the property with browser specific prefix to make it work like -moz-box-sizing Notice the -moz- prefix.
Also, if your template is using CSS3 that is a whole another bag of worms. Hope it was helpful and happy coding.
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My html generated pages is working wrong with IE and correct with Safari. I found out https://github.com/trevorlinton/webkit.js project but it still in development and does not support IE. Does exist another ways to turn IE engine to WebKit using JavaScript?
I know about Chrome Frame plugin for IE but it is not what I want
My aim to change engine - my pages generated from another program and that program is anonced as partaly support of IE and full support of Chrome and Safari
So, i think - the easist way to solve problem of IE to turn IE engine to WebKit engine by Javascript
UPDATE
I found out a solution for IE - I made a patch to update my genenerated pages after reverse enginiring of generated pages and scripts - but I like more complex solution
Is it possible to change browser engine by javascript?
Replacing a browser engine from a webpage is a ridiculously dangerous thing even if it was possible. This would open up various security risks because it would allow the engine to be changed to a modified one that contains malicious code, for example, or outdated security technologies.
It is recommended that you actually bother to code with standards rather than just for a specific browser to avoid compatibility issues or broken pages on other browsers.
Providing all the vendor-specific prefixes as well as the standardized version in CSS instead of just one vendor-specific prefix in CSS will ensure greater compatibility across a wider range of web browser engines.
For HTML, ensure that your code is validated properly and closes all tags. Doing this will help improve compatibility on other browsers, as every browser engine uses a slightly different way of interpreting the code.
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Javascript : What are the different conditions when javascript work in IE but not in Firefox or some other browser?
one that i know of is that while using certain window events..
What other scenarios can cause javascript to not work properly?
The answer is too complex to fully list here. Use sites like http://caniuse.com that will tell you which JavaScript is available in which browser.
Generally speaking, all browsers implement JavaScript differently. Microsoft have long been stuck in their own world, implementing their own ways to do things, whereas everyone else seems to try and conform to the standards as much as possible. Microsoft are coming around to the "standards" way of doing things, and from what I hear, IE11 will be a massive step in this direction.
As already mentioned, you can use http://caniuse.com/ to find what you can and can't do in different browsers, but then you'll likely end up doing what many others have done...write your own API which works around these to achieve a task...which is a bit unnecessary, unless you can find a ground-breaking way to implement your API that will be beneficial to other developers.
APIs like jQuery already work around these differences. The aim with these libraries is to provide clean JavaScript, whilst being completely transparent from the underlying JavaScript implementation.
Also, look into "shim"/"polyfill" implementations. These are used when a core feature that is recognised as part of an ECMAScript version has not been implemented in the browser. These provide the implementation for you, if it is not natively supported.
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what tools do you use for writing jquery code and testing/debugging your code?
The Firebug plugin for firefox is essential - it lets you:
Debug your code (step into, out, etc)
Set watch variables and expressions
See contents of all requests and responses, as well as all content received
Time to download each resource
Inspect and modify the DOM, including viewing the DOM after it has been dynamically modified by JavaScript
And much more!
There are also debuggers available for Internet Explorer and other browsers, but none are quite as powerful as firebug.
Depending on the language, there are other resources available for debugging server side code that come in quite handy, too. But that is another question...
jsFiddle is very handy for quick snippet debugging. There are competitors such as jsbin, but fiddle remains my favorite, even though it's only in alpha at the moment.
Of course I think Chrome's developer tools and FireBug/Web Developer for Firefox are tremendously helpful as well...each tool has it's area that it helps with.
Lastly, let's not forget: the jQuery API itself, a tremendous resource for information.
Google Chrome Developer Tools are really powerful.
Also great for debugging CSS and HTML issues. The DOM highlighting is really handy.
Aptana might be what you are looking for. It has support for jQuery, debugging and also CSS, html and ruby, and is generally very nice to work with.
even if it is funny, I find IE 8 dev tools very convinient for js debug
console.log(); is your friend. Pick up its output with Firebug for Firefox, or the built-in consoles in the developer tools in Safari and Chrome (IE no help as usual).