We Keep Coding

How do I prevent the line from not breaking in a header of a page?(html) [duplicate]

How can I read the line break from a value with JavaScript and replace all the line breaks with <br /> elements?
Example:
A variable passed from PHP as below:
"This is man.
Man like dog.
Man like to drink.
Man is the king."
I would like my result to look something like this after the JavaScript converts it:
"This is man<br /><br />Man like dog.<br />Man like to drink.<br /><br />Man is the king."

This will turn all returns into HTML
str = str.replace(/(?:\r\n|\r|\n)/g, '<br>');
In case you wonder what ?: means.
It is called a non-capturing group. It means that group of regex within the parentheses won't be saved in memory to be referenced later.
You can check out these threads for more information:
https://stackoverflow.com/a/11530881/5042169
https://stackoverflow.com/a/36524555/5042169

If your concern is just displaying linebreaks, you could do this with CSS.
<div style="white-space: pre-line">Some test
with linebreaks</div>
Jsfiddle: https://jsfiddle.net/5bvtL6do/2/
Note: Pay attention to code formatting and indenting, since white-space: pre-line will display all newlines (except for the last newline after the text, see fiddle).

Without regex:
str = str.split("\n").join("<br />");

This works for input coming from a textarea
str.replace(new RegExp('\r?\n','g'), '<br />');

If the accepted answer isn't working right for you then you might try.
str.replace(new RegExp('\n','g'), '<br />')
It worked for me.

Shortest code supporting the most common EOL styles \r, \n, \r\n and using HTML5 <br>:
s.replace(/\r?\n|\r/g, '<br>')

Regardless of the system:
my_multiline_text.replace(/$/mg,'<br>');

It is also important to encode the rest of the text in order to protect from possible script injection attacks
function insertTextWithLineBreaks(text, targetElement) {
var textWithNormalizedLineBreaks = text.replace('\r\n', '\n');
var textParts = textWithNormalizedLineBreaks.split('\n');
for (var i = 0; i < textParts.length; i++) {
targetElement.appendChild(document.createTextNode(textParts[i]));
if (i < textParts.length - 1) {
targetElement.appendChild(document.createElement('br'));
}
}
}

This worked for me when value came from a TextBox:
string.replace(/\n|\r\n|\r/g, '<br/>');

For those of you who just want to allow max. 2 <br> in a row, you can use this:
let text = text.replace(/(\r?\n){2,}/g, '<br><br>');
text = text.replace(/(\r?\n)/g, '<br>');
First line: Search for \n OR \r\n where at least 2 of them are in a row, e.g. \n\n\n\n. Then replace it with 2 br
Second line: Search for all single \r\n or \n and replace them with <br>

if you send the variable from PHP, you can obtain it with this before sending:
$string=nl2br($string);

It will replace all new line with break
str = str.replace(/\n/g, '<br>')
If you want to replace all new line with single break line
str = str.replace(/\n*\n/g, '<br>')
Read more about Regex : https://dl.icewarp.com/online_help/203030104.htm
this will help you everytime.

Not answering the specific question, but I am sure this will help someone...
If you have output from PHP that you want to render on a web page using JavaScript (perhaps the result of an Ajax request), and you just want to retain white space and line breaks, consider just enclosing the text inside a <pre></pre> block:
var text_with_line_breaks = retrieve_some_text_from_php();
var element = document.querySelectorAll('#output');
element.innerHTML = '<pre>' + text_with_line_breaks + '</pre>';

I had a config in PHP that was being passed in from the Controller. (Laravel)
Example: PHP Config
'TEXT_MESSAGE' => 'From:Us\nUser: Call (1800) 999-9999\nuserID: %s'
Then in javascript using es6 reduce. notice I had to have two \\ or the output was not being replace correctly. Here are the parameters that are assoicated with the reduce function
previousValue (the value resulting from the previous call to
callbackfn)
currentValue (the value of the current element)
currentIndex Optional
array (the array to traverse) Optional
//p is previousVal
//c is currentVal
String.prototype.newLineReplace = function(){
return [...arguments].reduce((p,c) => p.replace(/\\n/g,c), this);
}
Here is how i used it in my script.
<script type="text/javascript">var config = #json($config);</script>
config.TEXT_MESSAGE.newLineReplace("<br />")
of course you could just called it on a javascript sring like...
let a = 'From:Us\nUser: Call (1800) 999-9999\nuserID: %s'
var newA = a.newLineReplace("<br />")
//output
'From:Us<br />User: Call (1800) 999-9999<br />userID: %s'

Remove new line characters from data recieved from node event process.stdin.on("data")

I've been looking for an answer to this, but whatever method I use it just doesn't seem to cut off the new line character at the end of my string.
Here is my code, I've attempted to use str.replace() to get rid of the new line characters as it seems to be the standard answer for this problem:
process.stdin.on("data", function(data) {
var str;
str = data.toString();
str.replace(/\r?\n|\r/g, " ");
return console.log("user typed: " + str + str + str);
});
I've repeated the str object three times in console output to test it. Here is my result:
hi
user typed: hi
hi
hi
As you can see, there are still new line characters being read between each str. I've tried a few other parameters in str.replace() but nothing seems to work in getting rid of the new line characters.

You are calling string.replace without assigning the output anywhere. The function does not modify the original string - it creates a new one - but you are not storing the returned value.
Try this:
...
str = str.replace(/\r?\n|\r/g, " ");
...
However, if you actually want to remove all whitespace from around the input (not just newline characters at the end), you should use trim:
...
str = str.trim();
...
It will likely be more efficient since it is already implemented in the Node.js binary.

You were trying to console output the value of str without updating it.
You should have done this
str = str.replace(/\r?\n|\r/g, " ");
before console output.

you need to convert the data into JSON format.
JSON.parse(data) you will remove all new line character and leave the data in JSON format.

Use Greasemonkey to add bold tags to dates on a page?

I have a Greasemonkey script that prints a div -- works! However, I'd like to be able to add bold tags to all dates in this div.
Dates are formatted MM/DD/YYYY
So something like:
var regex = '\d{2}\/\d{2}\/\d{4}';
Then how would I perform the search replace? If the div was called loanTable:
Non-working concept:
$("#loanTable").html().replace( regex, "<b>" regex "</b>" )
Something like the above should work but I'm not sure of the exact syntax for this.

Use a regex capture group:
var loanTable = $("#loanTable")
var loanHTML = loanTable.html ().replace (/(\d{2}\/\d{2}\/\d{4})/g, "<b>$1</b>");
loanTable.html (loanHTML);

This piece of code is not valid JS:
var regex = '\d{2}\/\d{2}\/\d{4}';
$("#loanTable").html().replace( regex, "<b>" regex "</b>" )
The syntax for regex is /regex/, non quoted, or new Regex('regex') with quotes.
Start by assigning the html to a variable. Also <b> is barely used anymore, <strong> is the new standard. Then, replace() takes a regex and a string or function as parameters. To replace multiple times you have to use the g flag. Finally, to do what you want to accomplish you can use replacement tokens, like $1 etc...
var re = /\d{2}\/\d{2}\/\d{4}/g; // 'g' flag for 'global';
var html = $("#loanTable").html();
$("#loanTable").html(html.replace(re, '<strong>$&</strong>')); // The `$&` token returns the whole match

Last time I used GreaseMonkey, it wasn't easy to get jQuery to run in your user scripts.
Use the following code to do it without jQuery:
var loanTable = document.getElementById('loanTable');
loanTable.innerHTML = loanTable.innerHTML.replace(/(\d{1,2}\/\d{1,2}\/\d{4})/g, "<b>$1</b>");

One small aspect of this: you need to concatenate strings with a + operator:
$("#loanTable").html().replace( regex, "<b>" + regex + "</b>" )

Searching for a last word in JavaScript

I am doing some logic for the last word that is on the sentence. Words are separated by either space or with a '-' character.
What is easiest way to get it?
Edit
I could do it by traversing backwards from the end of the sentence, but I would like to find better way

Try splitting on a regex that matches spaces or hyphens and taking the last element:
var lastWord = function(o) {
return (""+o).replace(/[\s-]+$/,'').split(/[\s-]/).pop();
};
lastWord('This is a test.'); // => 'test.'
lastWord('Here is something to-do.'); // => 'do.'
As #alex points out, it's worth trimming any trailing whitespace or hyphens. Ensuring the argument is a string is a good idea too.

Using a regex:
/.*[\s-](\S+)/.exec(str)[1];
that also ignores white-space at the end

Have you tried the lastIndexOf function http://www.w3schools.com/jsref/jsref_lastIndexOf.asp
Or Split function http://www.w3schools.com/jsref/jsref_split.asp

Here is a similar discussion have a look

You can try something like this...
<script type="text/javascript">
var txt = "This is the sample sentence";
spl = txt.split(" ");
for(i = 0; i < spl.length; i++){
document.write("<br /> Element " + i + " = " + spl[i]);
}
</script>

Well, using Split Function
string lastWord = input.Split(' ').Last();
or
string[] parts = input.Split(' ');
string lastWord = parts[parts.Length - 1];
While this would work for this string, it might not work for a slightly different string, so either you'll have to figure out how to change the code accordingly, or post all the rules.
string input = ".... ,API";
here, the comma would be part of the "word".
Also, if the first method of obtaining the word is correct, ie. everything after the last space, and your string adheres to the following rules:
Will always contain at least one space
Does not end with one or more space (in case of this you can trim it)
then you can use this code that will allocate fewer objects on the heap for GC to worry about later:
string lastWord = input.Substring(input.LastIndexOf(' ') + 1);
I hope its help

jquery: how to get the text before and after a " - " with regex

I have a label, which contains text. I need to get the two text elements which are separated by " - ". How can I do this with regular expressions in jQuery?

I would advise to use split rather than a regular expression. You can get both elements by using string.split(" - ");. This will return a string array with the elements split at the " - ".

Why do you need regex?
var title = "Hello - World!";
var parts = title.split(' - ');
alert(parts[0] + '\n' + parts[1]);
Unless I'm missing something, regex is not necessary and just induces unnecessary overhead.

Why use a regex?
fiddle link
var array = $('label').map(function(){
return this.innerHTML.split('-');
}).get();
Markup
<label>test-test2</label>
<label>test1-test3</label>
This will produce an array of the individual text elements. See console output in fiddle link.

var mySplitResult = $('#myLabel').val().split("-");
mySplitResult[0] will contain the first bit
and
mySplitResult[1] will contain the second bit.