document.getElementById disabled in ASP.NET site [closed] - javascript

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I found a nice site that build in ASP.NET. I want to try some things on it, like entering text into input field through console, with JavaScript, but it looks like it disabled. when I try to do:
document.getElementById("name");
I get null, on each element I try it. In the js files of site I see they are using getElementById in the code, but somehow it's disabled for me.

You need to use clientId. For example here is your server control
<asp:textbox id="txtName" runat="server/>
and now you want to access that with javascript then you need to do following.
document.getElementById("<%=txtName.ClientID%>").value;

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how to detect if a #hash tag is being entered in and input element [closed]

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Closed 8 years ago.
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My question is simple:
How do I make the use of JavaScript regex to detect whether a #hashtag is being entered in the input element? I have a function to convert the hashtag into a clickable link but it's PHP. I want a similar function but in jQuery the reason is that if a hashtag is entered then I can send a value to the PHP processor form.
Sorry there is no code as I dont know much about JavaScript regex, also, I could not find any good tutorials.
You are looking for this: (#\w*)
function hasNonStandard(inputElem) {
return /[#\w*]/.test(inputElem.value);
}

Who/what calls CSS? [closed]

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In his video tutorail
http://net.tutsplus.com/tutorials/php/codeigniter-from-scratch-day-1/
the author goes to the Codegnitor web site. At first (1:32) the site looks strange (like it did not have any CSS behind it), but when he refreshes it once more the site looks like it should (1:37).
Does anyone know what is the mechanism behind it? I guess that JavaScript calls CSS. Can anyone give me some more details/examples.
Namely I would like to have my site working just like that.
CSS gets activated by 2 possible methods.
Invocation by DOM when the html file is parsed.
Invocation of CSS forcefully by JavaScript's functions.
On this video second method has been used.

How to show page preview of url entered like facebook wall? [closed]

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Closed 9 years ago.
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I that small description of the page should appear when user enters the url.
I have textbox where user enters url. I want when url is entered small textarea and div should appear which gives the preview of that url page content.
Here is jQuery library using PHP with curl doing just that:
https://github.com/LeonardoCardoso/Facebook-Link-Preview
Facebook takes the image from the this element in your header:
<link rel="image_src" href="http://yoursite.com/thumbImage.jpg" >
You can also use the specific meta tag for facebook:
<meta property='og:image' content='http://yoursite.com/thumbImage.jpg'/>
Documentation here.
If none of them exist, then it it will take the first image on your site.

What happens after you call document.getElementById() in javascript? [closed]

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I am trying to refresh some div in my website dynamically.
//code changing the source
document.getElementById('#chatbox').src = document.getElementById('#chatbox').src; //refreshes the chatbox
alert("HERE");
The alert() function does not get executed after getElementbyId() is called.
What is going on?
You are trying to access src of undefined as there is probably no element with the id "#chatbox".
Remove the hash and it should work:
document.getElementById('chatbox').src
To debug take a look at your javascript error console or try
alert(document.getElementById('#chatbox')) // undefined
That's because it should be
document.getElementById('chatbox')
Perhaps you are confusing this with jQuery. With jQuery, you would use:
$('#chatbox')

Edit external CSS/SCSS with javascript [closed]

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I need to 'edit' a file that's already saved on my server, example:
<link rel="stylesheet" href="css/plugin.scss">
But not only that, I want to edit a certain specific line, in SASS you can define variables in css, basically, I'd like to search inside this file with JAVASCRIPT for the string:
'$increment:
And if it's found, find out what line it is on and replace that whole line with:
'$increment:10;
Basically I want to generate a downloadable file for the user that's custom depending on what settings they choose via a html input field.
If there's a simpler/better explanation I'm all ears :)
The javascript you seem to be referring to (jQuery) is a client-side language so you're not going to be able to do anything on your server with it. A js solution that could do this may be written in nodejs but you may be better served using something like Python, Rails, or even PHP.

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