how to remove trailing html break from string? - javascript

I have a string below and I want to remove the trailing but I'm struggling. Any help?
This is a string<br>
next line<br>
So after my function, the string should be
This is a string<br>
next line
Doing this code below doesn't seem to be working. Well, it works but it doesn't clear out two trailing breaks.
mystring=mystring.replace(/<br>$/,'');
So if my string is actually:
This is a string<br>
next line<br>
<br>
then the code above just returns
This is a string<br>
next line
<br>

If you want to remove all trailing <br>s, then use a quantifier:
/(<br>\s*)+$/
\s matches any white space characters, so even if there is line break between continuous <br>s, it will still match.
DEMO

If it's the contents of an HTML element, you can just use jQuery to remove the element:
$('#container').children('br').last().remove();
If it's a string, you can do something like this (still leveraging jQuery):
var cleaner = $('<div />').html(mystring);
cleaner.children('br:last-child').remove();
mystring = cleaner.html();
I prefer this over splitting on a string or your current RegEx because you're not handling the scenario of a BR tag like this: <br />.
http://jsfiddle.net/TTg3p/

I tested your code, and it seems to work. I pasted the following into a file and then viewed in firefox, and clicked view source. The second br was not visible in the source.
<html>
<body>
<script>
var mystring = 'This is a string<br>\n next line<br>'
mystring=mystring.replace(/<br>$/,'');
document.write(mystring);
</script>
</html>
Perhaps your mystring variable has an actual linebreak (\n) at the end of it after the br, so your regular expression is not matching?

Try this:
mystring.split('<br>').slice(0,-1).join('<br>');
demo
:)

If you want to remove the last trailing <br> inside an element, you can use this:
const element = document.getElementById('element')
console.log('Before:', element.innerHTML)
const last = element.childNodes[element.childNodes.length - 1]
if (last.tagName === 'BR') last.remove()
console.log('After:', element.innerHTML)
<div id="element">Some text<br>other text<br></div>

Related

Create a line break in the text inside span

I am using the following HTML in the application:-
<span style="display:inline-block;white-space: pre-line">I would like to discuss this: {"incidentId":"TG00040","desc":"Patient Details","reportdetails":"Patient Name:Bhawana \n Grade:10th \n Teacher:Meeta"}</span>
But am not able to create line breaks in the text. I have also tried using \n,\r and br tag but nothing seems to break. The expected output is:-
I would like to discuss this: {"incidentId":"TG00040","desc":"Patient Details","reportdetails":"Patient Name:Bhawana Grade:10th Teacher:Meeta"}
If data displayed in span contain the character \n and you can't modify it before display it in dom
you can use a simple js function to replace all \n occurence by <br/>
var span = document.getElementById('my-data');
span.innerHTML = span.innerHTML.replaceAll('\\n', '<br/>');
<span id="my-data">I would like to discuss this: {"incidentId":"TG00040","desc":"Patient Details","reportdetails":"Patient Name:Bhawana \n Grade:10th \n Teacher:Meeta"}</span>
just be careful to mastered dom modification when you replace innerHTML. here there is no risk but if you have based replace on user input you can have xss issue
use <br> instead of \n. Do you want output like this with a line break?
<span style="display:inline-block;white-space: pre-line">I would like to discuss this: {"incidentId":"TG00040","desc":"Patient Details","reportdetails":"Patient Name:Bhawana <br> Grade:10th <br> Teacher:Meeta"}</span>

Regex to strip html tag with certain attribute

I have some invalidly-nested HTML like:
<form class="form1" method="get">
<div>
<input name="field1">
</form>
<form class="form2" method="get">
<input name="field1">
</form>
</div>
Yeah, it's a mess, don't ask. The invalid nesting is causing problems somewhere else. jQuery I think is expecting a closing </div>, and only finding it at the last one. It's then treating the second <form> tag as invalid, and also discarding the closing </form> immediately above it, and assuming everything between lines 1 and 9 are one form.
If I output these to the console:
$('.form1).html() - all of line 1 - 9
$('.form2).html() - undefined
So what I'm trying to do is treat the whole thing as a string, and use regex to strip out form2. I'm expecting a regex something like:
formText.replace(/(<form\b[^>]*>)[^<>]*(<\/form>)/gi, "");
but I'm not sure how to reference the specific form with class=form2.
There's also a problem with it being a multi-line string.
Update: added more detail, outlining why jQuery's remove() method isn't working. jQuery only thinks there's one form unfortunately.
Don't use regex to parse HTML. Since you're using jQuery, just use .remove():
$(function() {
$(".form2").remove();
});
JSFiddle
I ended up using:
formText = formText.replace(/(<form\b[^>]*form2+.*>[\s\S]+<\/form>)/gi, "");
The [\s\S] matches all characters including \n and \r to cover the newlines.
I could probably have made the part of the regex dealing with the class name more specific so I knew it was the class and not some other random form with a similar, but in practice it didn't matter (there was only one instance of the 2nd form, with a very specific class name).

Appending a special character with jQuery not working

I am returning special characters (specifically °) in JavaScript/jQuery, but it is not converting the entity to the desired character in the display. How can I display the degree sign correctly?
It must be simple; what am I missing? I have checked decodeURL, but it does nothing.
Demo fiddle
The HTML:
<p>Try to give answer is: </p>
<div id="target"></div>
<p>But should look like:</p>
<div> 5 °C</div>
And the Javascript with jQuery:
$('#target').text('5 °C');
Output:
To see the interpreted character entity you need to use html():
$('#target').html('5 °C');
Updated fiddle
Try this:
$('#target').html('5 °C');
text function escapes the html characters so you get what you see.

replace string using regex

I have text inside "textarea" and I was trying to remove the text between: <textarea></textarea> using replace function with some regex. here is what I did so far:
x = '<TEXTAREA style="DISPLAY: none" id=test name=test>teeeeessst!##$%&*(LKJHGFDMNBVCX</TEXTAREA>';
x.replace('/<TEXTAREA style="DISPLAY: none" id=test name=test>.*</TEXTAREA>/s','<TEXTAREA style="DISPLAY: none" id=test name=test></TEXTAREA>');
You'll probably want something like this:
x.replace(/(<textarea[^>]*>)[^<]+(<\/textarea>)/img, '$1$2');
This will replace things case-insensitively within multi-line strings and avoiding greedy matches of things like ".*"
First problem is that you've got your regex inside quotes. It should just be /regex/ without quotes. Then you're going to have to put a backslash before the forward slash in the regex.
/<TEXTAREA style="DISPLAY: none" id=test name=test>.*<\/TEXTAREA>/
There's no regex flag "s", so I don't know what you thought it means but just drop it.
Similar to Eric's method, or use more general regexp.
var re =/(\<[^<]+\>)[^<]+(<\/[^<]+>)/;
x = x.replace(re, '$1$2');
You can use this tool to have a test. The result should be output to testarea.

How can I use a multiline value for an HTML tag attribute? (i.e. how do I escape newline?)

How do I include a newline in an HTML tag attribute?
For example:
<a href="somepage.html" onclick="javascript: foo('This is a multiline string.
This is the part after the newline.')">some link</a>
Edit: Sorry, bad example, what if the tag happened to not be in javascript, say:
<sometag someattr="This is a multiline string.
This is the part after the newline." />
Edit 2: Turns out the newline in the string wasn't my problem, it was the javascript function I was calling. FWIW, "
" can be used for newline in an HTML attribute.
From what I remember about the HTML standard, character entities work in attributes, so this might work:
<sometag someattr="This is a multiline string.
This is the part after the newline." />
I'm not sure if the "newline" you want ought to be
(\n) or
(\r\n), and I'm not sure if browsers will interpret it the way you want.
Why do you need it? What specific problem are you trying to solve by adding a newline in an HTML tag attribute?
To include a multiline value, just continue the text of the html attribute on the next line in your editor e.g.
<input type="submit" value="hallo
hallo">
will put the second hallo under the first
As a general rule newlines in attributes are preserved so your second example would work fine. Did you try it? Can you give a specific example where you are having problems with it?
As test take a look at this:-
<a href="somepage3.html" onclick="javascript: alert(this.getAttribute('thing'))" thing="This is a multiline string.
This is the part after the newline.">some link</a>
The alert include the newline in the attribute.
<a href="somepage.html" onclick="javascript: foo('This is a multiline string. \
This is the part after the newline.')">some link</a>
Javascript needs a backslash at the end of the new line in a string.
i'm not certain, but you can try \r or \n
javascript: foo('This is a multiline string.\rThis is the part after the newline.')
or
javascript: foo('This is a multiline string.\nThis is the part after the newline.')
Usually, line breaks in HTML source code display what you intended in the result.
(Depends on the editor of course)
Since it's in Javascript, you would use "\n" if inside double-quotes (not positive about single-quotes, I've been in PHP a lot lately.
Honestly, it's worth mentioning that you should use Events and a delegator instead of placing a javascript event directly on the element.

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