jQuery convert line breaks to br nl2br equivalent

Question

I m having jQuery take some textarea content and insert it into an li   I want it to visually retain the line breaks   There must be a really simple way to do this

User · Answer

This JavaScript function considers whether to use insert or replace to handle the swap.

(Insert or replace HTML line breaks)

/**
 * This function is same as PHP's nl2br() with default parameters.
 *
 * @param {string} str Input text
 * @param {boolean} replaceMode Use replace instead of insert
 * @param {boolean} isXhtml Use XHTML 
 * @return {string} Filtered text
 */
function nl2br (str, replaceMode, isXhtml) {

  var breakTag = (isXhtml) ? '<br />' : '<br>';
  var replaceStr = (replaceMode) ? '$1'+ breakTag : '$1'+ breakTag +'$2';
  return (str + '').replace(/([^>\r\n]?)(\r\n|\n\r|\r|\n)/g, replaceStr);
}

Demo - JSFiddle

JavaScript nl2br & br2nl functions

User · Answer

demo  http   so devilmaycode it jquery-convert-line-breaks-to-br-nl2br-equivalent   function nl2br  str  is xhtml           var breakTag    is xhtml    typeof is xhtml      undefined       lt br   gt       lt br gt            return  str       replace      gt  r n     r n  n r  r  n  g    1   breakTag    2              http   phpjs org functions nl2br 480

User · Answer

to improve  Luca Filosofi s accepted answer   if needed  changing the beginning clause of this regex to be      gt   s   r n    will also ingore the cases where the newline comes after a tag AND some whitespace  instead of just a tag immediately followed by a newline

User · Answer

In the spirit of changing the rendering instead of changing the content  the following CSS makes each newline behave like a  lt br gt    white-space  pre  white-space  pre-line    Why two rules  pre-line only affects newlines  thanks for the clue   KevinPauli   IE6-7 and other old browsers fall back to the more extreme pre which also includes nowrap and renders multiple spaces  Details on these and other settings  pre-wrap  at mozilla and css-tricks  thanks  Sablefoste    While I m generally averse to the S O  predilection for second-guessing the question rather than answering it  in this case replacing newlines with  lt br gt  markup may increase vulnerability to injection attack with unwashed user input   You re crossing a bright red line whenever you find yourself changing  text   calls to  html   which the literal question implies would have to be done    Thanks  AlexS for highlighting this point    Even if you rule out a security risk at the time  future changes could unwittingly introduce it   Instead  this CSS allows you to get hard line breaks without markup using the safer  text

User · Answer

I wrote a little jQuery extension for this     fn nl2brText   function  sText        var bReturnValue    undefined     typeof sText      if bReturnValue            sText       lt pre gt    html this html   replace   lt br   gt    gt  i    n    text              var aElms           sText split   r n  r  n   forEach function sSubstring            if aElms length                aElms push document createElement  br                       aElms push document createTextNode sSubstring                var  aElms     aElms       if bReturnValue            return  aElms            return this empty   append  aElms

User · Answer

Another way to insert text from a textarea in the DOM keeping the line breaks is to use the Node innerText property that represents the rendered text content of a node and its descendants   As a getter  it approximates the text the user would get if they highlighted the contents of the element with the cursor and then copied to the clipboard   The property became standard in 2016 and is well supported by modern browsers  Can I Use  97  global coverage when I posted this answer

User · Answer

Solution  Use this code  jQuery nl2br   function varTest     return varTest replace    r n  n r  r  n  g    lt br gt

User · Answer

you can simply do   textAreaContent textAreaContent replace   n g   lt br gt

User · Answer

Put this in your code  preferably in a general js functions library    String prototype nl2br   function         return this replace   n g    lt br   gt         Usage   var myString    test ntest2    myString nl2br      creating a string prototype function allows you to use this on any string

[javascript] jQuery convert line breaks to br (nl2br equivalent)

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