Can I make a Twitter Follow Button from an external JavaScript file? - javascript

My site calls an external JavaScript file to create the footer on every page. I would like to include a follow button in the footer. However, all of the examples on the developer page are geared toward creating the button from an HTML file with embedded script, and I am not experienced enough with JS to figure out how to rewrite the code to work without the HTML. I have already tried storing the whole HTML blob as a string and writing it to the document. I also took the JS out of the blob and added it to the file, but that didn't work either.
Here is the HTML they provide, and I tried to extract
Follow #dbb0
<script>
!function(d,s,id){
var js,fjs=d.getElementsByTagName(s)[0];
if(!d.getElementById(id)){
js=d.createElement(s);
js.id=id;
js.src="//platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);
}
}(document,"script","twitter-wjs");
</script>

To answer your main question: yes it's possible.
You should use the DOM, innerHTML (be careful with this) or jQuery to create a very similar html structure, and then add it to your document.
You should ask more specific questions to get further, this is too vague :)

Related

Better way to write HTML instead of document.write()

On my website I have a menu button that goes on every page and also a comments section. Instead of copying and pasting this into every single HTML file I created a JavaScript file that creates all of the HTML via the document.write function. This works fine, but as it is getting more and more lengthy and complicated it is also getting harder and harder to find elements and attributes since they are all squashed in one line.
I want to know if there is a better way to do this because I feel this is not the correct way due to it being so messing and disorganized.
I am just using a JavaScript file. It would look something like this:
document.write("<div id="id"></div>");
but with a lot more HTML.
I would suggest templating with a server side language such as PHP. This will allow you to format your different sections so that they are easily readable. Also it will work even if JavaScript is turned off on the browser.
<html>
<head></head>
<?php require("menu.php"); ?>
<!-- HTML body content -->
<?php require("comments.php"); ?>
</html>
If you want to stick with a client side approach then you can just put your menu and comments into separate html files and use jQuery to load it using
$('#Menu').load('menu.html');
$('#CommentSection').load('comments.html');
You can use jquery
Put your button in its own .html file like button.html with .load() in main html file.
$('#WhereYouWantItID').load('whatfolder/button.html');
This will load the button.html file to a specific target on your page

BabylonJS Execute Script from External File

I'm having a (simple) issue, but I have no idea how to fix it. Essentially, every tutorial I have come across for Babylon puts all of the Javascript code inside < script > tags in the main HTML page.
However, I would like to have all of my Javascript code inside a separate file. I have tried every way of loading it as I could think of, though I am a novice at Javascript (I am decent at C++, and I can see the similarities); yet I was unable to make it load. (It works fine when called from the HTML page itself).
Does anyone know what (if anything) I can do in order to be able to load my scripts from external files, and still get everything to work? Thanks in advance!
2 options:
register to the DOMContentLoaded event in your external JS file
reference your JS file with the tag at the end of the HTML page
You can find a sample in one of my tutorials here: http://blogs.msdn.com/b/davrous/archive/2014/11/18/understanding-collisions-amp-physics-by-building-a-cool-webgl-babylon-js-demo-with-oimo-js.aspx
Enjoy and thanks for using Babylon.js! :)
David

sigma.js How to plug a plugin on my own page

I'm totally new at coding and i have some trouble using the dragNodes plugin. I can make the plugin work by itself with the generated random graph example, but I am struggling to make it work with my own graph.
I don't understand what to put in the html. I tried to put only that:
`<script src="sigma.js/plugins/sigma.plugins.dragNodes/sigma.plugins.dragNodes.js"></script>sigma.plugins.dragNodes(s, s.renderers[0]);`
and it doesn't make my nodes move. I think I have to change the content of "s" and "s.renderers[0]" but I cannot find where., and I don't know how to do it...
Basically, I would love if anyone could give me some explanations about how to plug a plugin in my page?
If you could help me, I'm lost and that would be awesome! Thank you a lot!
I think you are mixing up two things:
How to use script into html
How to include external js files in a web page.
In order to insert javascript directly into an html page you have to use the script tag as follow (called inline js):
<body>
<script>
// some inline js
var a = 1;
</script>
</body>
In order to include js from an external file you have to reference the file with the src attribute just like you did.
<script src="sigma.js/plugins/sigma.plugins.dragNodes/sigma.plugins.dragNodes.js"></script>
The only thing that you missed is that sigma.plugins.dragNodes(s, s.renderers[0]); is also some js code, you thus have to put it into script tags to that it can be interpreted as such by the browser.
Here is what you probably are trying to write:
<script src="sigma.js/plugins/sigma.plugins.dragNodes/sigma.plugins.dragNodes.js">
</script>
<script>
sigma.plugins.dragNodes(s, s.renderers[0]);
</script>
Having all this into <body>tags.
I should also mention that to render your graph using sigma you should have an instance of sigma in your page, and in your case it should be called s.
To learn more about js/web programming I would advise this: http://www.codecademy.com/
As far as documentation for sigma is concerned check out their tutorial: http://sigmajs.org/
In addition to Nicolas Joseph's answer (put javascript in script tag), you should also download the js library that is required and save the html file in the appropriate path.
For example if your file.html is in a directory dir (dir/file/.html)
Then the command:
<script src="sigma.js/plugins/sigma.plugins.dragNodes/sigma.plugins.dragNodes.js">
</script>
will search for a file named sigma.plugins.dragNodes.js in the following path:
dir/sigma.js/plugins/sigma.plugins.dragNodes/sigma.plugins.dragNodes.js
To check out which librarires you are missing you should open debug mode in your browser (right click->inspect element) and check the console tab.
Cheers

jQuery in CSS style sheet

I’m working on making my web site fade in and out every time I click a link to another page. I need to use jQuery to do this. Do I need to put the jQuery code on every page or can I write jQuery into the CSS Stylesheet? If so, how do I format the CSS Stylesheet to accept jQuery?
I’m experimenting with the code from this forum post: Fade Out between pages – CSS-Tricks
Edit to question based on comments
So, I now know that I can’t put JavaScript in CSS file. What’s the best way to put JavaScript code that applies to all pages in a site? I want to write this transition code and then not have to write/edit it into every page.
Save the JavaScript in a file with the extension .js, for example main.js. Then give it a public URL, in a similar way that your CSS files are accessible from a URL. An example URL: http://example.com/js/main.js. You might do that by putting it in a js folder in your public_html folder on your server – it depends on your server.
Then, near the end of each page’s HTML, right above </body>, add this HTML tag:
<script src="/js/main.js"></script>
The script tag with a src attribute will load the JavaScript at the given URL and then run it immediately.
I recommend putting it at the end of your <body> element and not inside the <head> because the script prevents the rest of the page from loading and displaying to the user while the script runs. If you make the script run only at the very end of the page, the page is already loaded and the user can see all of its content.
you need to do a $.fadeout on the window.beforeunload event, bye
PD: in a js file, not in a stylesheet, you can´t use JS in a stylesheet. bye.

Programmatically remove <script src="/unwanted.js".. /> reference

I have partial control of a web page where by I can enter snippets of code at various places, but I cannot remove any preexisting code.
There is a script reference midway through the page
<script src="/unwanted.js" type="text/javascript"></script>
but I do not want the script to load. I cannot access the unwanted.js file. Is there anyway I can use javascript executing above this refernce to cause the unwanted.js file not to load?
Edit: To answer the comments asking what and why:
I'm setting up a Stack Exchange site and the WMD* js file loads halfway down the page. SE will allow you to insert HTML in various parts of the page - so you can have your custom header and footer etc. I want to override the standard WMD code with my own version of it.
I can get around the problem by just loading javascript after the original WMD script loads and replacing the functions with my own - but it would be nice not to have such a large chunk of JS load needlessly.
*WMD = the mark down editor used here at SO, and on the SE sites.
In short, you can't. Even if there is a hack, it would heavily depend on the way browsers parse the HTML and load the scripts and hence wouldn't be compatible with all browsers.
Please tell us exactly what you can and cannot do, and (preferably; this sounds fascinating) why.
If you can, try inserting <!-- before the script include and --> afterwards to comment it out.
Alternatively, look through the script file and see if there's any way that you could break it or nullify its effects. (this would depend entirely on the script itself; if you want more specific advice, please post more details, or preferably, the script itself.
Could you start an HTML comment above it and end below it in another block?
What does the contents of unwanted.js look like?
You can remove a script from the DOM after it is called by using something simple such as:
s = document.getElementById ("my_script");
s.parentNode.removeChild(s);
This will stop all functions of the script but will not take it out of user's cache. However like you wanted it can't be used.
Basically you can't unless you have access to the page content before you render it.
If you can manipulate the HTML before you send it off to the browser, you can write a regular expression that will match the desired piece of code, and remove it.

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