I had a java script code in asp.net ,It's works fine in all browser but when javascript is disabled in browser the script is not working ,so can anyone suggest me where to write the code
so can anyone suggest me where to write the code
You don't have much choices left other than doing it on the server. Of course there are some levels of interaction that are possible only to be made with javascript. For example things like AJAX calls, subscription to events in DOM elements like onchange, ... If the user disables javascript your site will become less dynamic, that's for sure.
If you absolutely need to use javascript you could tell the user that your site requires it in order to work properly.
unfortunately there is no way around it...if javascript is disabled...then give users a message to turn it back on.
You could alert the user using the noscript-tag that he or she should turn it javascript back on
<noscript>
Javascript is disabled
</noscript>
Related
I have a short snippet of jquery code that I use to pick and submit a specific choice in a drop-down menu on a website.
For now, I've pasted the code into the console, but I would like to set up some form of simple local module with a button, that when clicked runs the jquery code on the specific website.
I don't know much coding aside from a bit VBA, so I'm unsure what's the best way to go about this. Intuitively, I imagine that it shouldn't be that difficult of a task, but I can't quite wrap my head around how I set it up and if it's even possible to click a button in a local module that then performs an action on a webpage.
Really hoping some of you might be able to give me some guidance. Any help is appreciated!
Best regards
Magnus
Ideally, I would like to do this in VBA, but i'm unsure if it's possible to run jquery scripts from VBA. I'm using Chrome Browser by the way.
I am using the OpenWebkitSharp browser in a VB.NET project. What I am trying to do is use WebkitBrowser1.Navigate to display some HTML in the browser "on the fly". This works great for basic HTML, but Javascript does not appear to work at all in this scenario. For example, I have...
WebKitBrowser1.DocumentText = "<!DOCTYPE html><html><head><script>alert('This is an alert'); </script></head><body><p>This is some text</p></body></html>"
The body text appears just fine, but there is never a Javascript alert. I made sure that Javascript is enabled in the Webkit browser, so that's not the issue.
If I use the Navigate method to display a local page that contains Javascript (ie WebkitBrowser1.Navigate("path/to/local/file"), then the Javascript works perfectly. But it doesn't work at all when setting the HTML using WebKitBrowser1.DocumentText.
For this particular project, I need to generate the HTML code and display it "on the fly", so I can't use WebKitBrowser1.Navigate. I have to use WebkitBrowser1.DocumentText instead (or something similar).
Any ideas?
Or might there be a better way to accomplish this?
Thanks!
I ran into a similar situation recently, and while I'm still looking for that solution that allows what you're describing, here's what I decided to do as a workaround:
-Save HTML to temporary file
-Load temp file into WebKit control on form.
I'm considering making my own modifications to OpenWebKitSharp however, to see if I can make this happen. Basically, it seems like HTML loaded through DocumentText follows a different render path than loaded through Navigate.
I run a forum and there's an option to enable full html coding in posts. However, it does not have the option to disable javascript and tags, to my chagrin. For security reasons, I wanted to disable them, which brings me to the question: is there any way via jquery or javascript to accomplish this? I have been searching for it but to no avail.
Note: All posts are enclosed in <div class="postcolor"></div> tags.
Thank you!
This question is actually more complicated then you think. Even if you remove script tags, what happens when the user inserts something like <a href="javascript:function();">,, or Javascript is disabled?
It would be much better to use a server-side language to do this processing for you. Since PHP is a commonly used server-side language, here's PHP's strip_tags() function (as an example):
$allowed_tags = "<p><strong><i>";
strip_tags($post, $allowed_tags);
No. User can disable javascript. Use (PHP) function instead
define('ALLOWED_TAGS', '<p><b><div><table><tr><td>'); //and more
strip_tags($message, ALLOWED_TAGS);
My site heavily depends upon Javascript and if I turn it off my website looks real ugly.
I want to force the user to use Javascript by show him a notification to turn it on, else prompt him that site can't be viewed.
What do I do to achieve this?
Have a look here:
noscript tag
All you can do is test that javascript is turned on or not, and show a notification that the site is best viewed with javascript turned on.
<script type="text/javascript">
document.write("Hello World!")
</script>
<noscript>
Your browser does not support JavaScript!
</noscript>
Also, feel free to google 'html script tag' and see http://www.w3schools.com/tags/tag_noscript.asp
First off, be warned that forcing the user to do anything is usually considered quite rude. Lots of people keep javascript either disabled entirely or severely restricted precisely because some twerp wanted to use it to force them to do something or look at something.
With that said, you can include some text in <noscript></noscript> tags. That text will only show if the browser doesn't have javascript, or has it disabled.
For your question:
By default show the notification, and with JS + some sort of document/DOM Ready event just remove the notification. Try not to do this on window/onload because then you'll see the notification until ALL resources of that page have been loaded, which takes longer than dom ready. That way, everybody who doesn't have JS will see the message.
But ideally you'd just want to have a website that works with, or without javascript. Maybe unobtrusive javascript is a nice search term for you.
I watched an interesting talk by John Resig (The creator of JQuery) and he even mentions in his video, do not rely on Javascript.
You create a landing page that uses a <noscript> tag to inform the user that your web site doesn't work without Javascript. Then you go and pray $DEITY for forgiveness because you added to the general mire pool that is the web.
Okay i know that it's important for your website to work fine with javascript disabled.
In my opinion one way to start thinking about how to design such websites is to detect javascript at the homepage and if it's not enabled redirect to another version of website that does not javascript code and works with pure html (like gmail)
Another method that i have in mind is that for example think of a X (close button) on a dialog box on a webpage. What if pressing the X without any javascript interference lead to sending a request to the server and in the server side we hide that dialog next time we are rendering the page, And also we bind a javascript function to onclick of the link and in case of the javascript enabled it will hide the dialog instantly.
What do you think of this? How would you design a website to support both?
One way to deal with this is to :
First, create the site, without any javascript
Then, when every works, add javascript enhancements where suitable
This way, if JS is disabled, the "first" version of the site still works.
You can do exactly the same with CSS, naturally -- there is even one "CSS Naked Day" each day, showing what websites look like without CSS ^^
One example ?
You have a standard HTML form, that POSTs data to your server when submitted, and the re-creation of the page by the server displays a message like "thanks for subscriving"
You then add some JS + Ajax stuff : instead of reloading the whole page while submitting the form, you do an Ajax request, that only send the data ; and, in return, it displays "thanks for subscribing" without reloading the page
In this case, if javascript is disabled, the first "standard" way of doing things still works.
This is (part of) what is called Progressive enhancement
The usual method is what's called progressive enhancement.
Basically you take a simple HTML website, with regular forms.
The next enhancement is CSS - you make it look good.
Then you can enhance it further with Javascript - you can add or remove elements, add effects and so on.
The basic HTML is always there for old browsers (or those with script blockers, for example).
For example a form to post a comment might look like this:
<form action="post-comment.php" method="post" id="myForm">
<input type="text" name="comment">
</form>
Then you can enhance it with javascript to make it AJAXy
$('#myForm').submit(...);
Ideally the AJAX callback should use the same code as post-comment.php - either by calling the same file or via include, then you don't have to duplicate code.
In terms, it is not important to make your site work with JavaScript disabled. People who disable JavaScript are people who want to hack bugs into your site, they don't deserve to navigate it correctly. Don't waste your efforts with them. Everybody know the Web is unsurfable without JavaScript.
The only thing you have to be careful is about your forms: Don't ever trust filters in JavaScript, Always filter it again on server-side, ALWAYS!
Use Progressive Enhancement, study jquery to understand it. It takes some time till you get your head around it. For example your idea:
to detect javascript at the homepage
and if it's not enabled redirect to
another version of website that does
not javascript code and works with
pure html
how would you detect if javascript is disabled? not with javascript, obivously...
you're thinking the wrong way round: the most basic version has to be the default version, and then, if you detect more advanced capabilities, you can use them.
Try to avoid separate versions for different bowsers/capabilities for as long as you can. It's so much work to keep all versions in sync and up-do-date.
Some good ressources to get you started:
Understanding Progressive Enhancement
Progressive Enhancement with JavaScript
Test-Driven Progressive Enhancement
The best way is to design a page that works adequately without JS. Then add a <script> block at the bottom of the <body> section with code like this:
window.onload = function() {
// Do DOM manipulations to add JS functionality here. For instance...
document.getElementById('someInputField').onchange = function() {
// Do stuff here that you can't do in HTML, like on-the-fly validation
}
}
Study the jQuery examples. They show lots of things like this. This is called "unobtrusive JavaScript". Google for that to find more examples.
EDIT: The jQuery version of the above is:
$(document).ready(function() {
// Do DOM manipulations to add JS functionality here. For instance...
$('#someInputField').change(function() {
// Do stuff here that you can't do in HTML, like on-the-fly validation
});
});
I added this just to show the lower verbosity of jQuery vs. standard DOM manipulation. There is a minor difference between window.onload and document.ready, discussed in the jQuery docs and tutorials.
What you're aiming for is progressive enhancement. I'd go about this by first designing the site without the JavaScript and, once it works, start adding your JavaScript events via a library such as jQuery so that the behaviour of the site is completely separate from the presentation. This way you can provide a higher level of functionality and polish for those who have JavaScript enabled in their browsers and those who don't.