Javascript how to split newline

Question

I m using jquery  and I have a textarea  When I submit by my button I will alert each text separated by newline   How to split my text when there is a newline     var ks       keywords   val   split   n       function            document  ready function                data   submit function e              e preventDefault               alert ks 0                 each ks  function k                 alert k                                            jQuery     example input    Hello There   Result I want is    alert Hello   and alert There

User · Answer

The simplest and safest way to split a string using new lines, regardless of format (CRLF, LFCR or LF), is to remove all carriage return characters and then split on the new line characters. "text".replace(/\r/g, "").split(/\n/);

This ensures that when you have continuous new lines (i.e. \r\n\r\n, \n\r\n\r, or \n\n) the result will always be the same.

In your case the code would look like:

(function ($) {
    $(document).ready(function () {
        $('#data').submit(function (e) {
            var ks = $('#keywords').val().replace(/\r/g, "").split(/\n/);
            e.preventDefault();
            alert(ks[0]);
            $.each(ks, function (k) {
                alert(k);
            });
        });
    });
})(jQuery);

Here are some examples that display the importance of this method:

_x000D_

var examples = ["Foo\r\nBar", "Foo\r\n\r\nBar", "Foo\n\r\n\rBar", "Foo\nBar\nFooBar"];_x000D_
_x000D_
examples.forEach(function(example) {_x000D_
  output(`Example "${example}":`);_x000D_
  output(`Split using "\n": "${example.split("\n")}"`);_x000D_
  output(`Split using /\r?\n/: "${example.split(/\r?\n/)}"`);_x000D_
  output(`Split using /\r\n|\n|\r/: "${example.split(/\r\n|\n|\r/)}"`);_x000D_
  output(`Current method: ${example.replace(/\r/g, "").split("\n")}`);_x000D_
  output("________");_x000D_
});_x000D_
_x000D_
function output(txt) {_x000D_
  console.log(txt.replace(/\n/g, "\\n").replace(/\r/g, "\\r"));_x000D_
}

_x000D_

User · Answer

Since you are using textarea  you may find  n or  r  or  r n  for line breaks  So  the following is suggested       keywords   val   split   r  n    ref  check whether string contains a line break

User · Answer

x000D   x000D   function      x000D      document  ready function     x000D          data   click function e    x000D        e preventDefault    x000D          each     keywords   val   split   n    function e  element    x000D          alert element   x000D            x000D          x000D        x000D     jQuery   x000D   lt script src  https   cdnjs cloudflare com ajax libs jquery 3 3 1 jquery min js  gt  lt  script gt  x000D   x000D   lt textarea id  keywords  gt Hello x000D  World lt  textarea gt  x000D   lt input id  data  type  button  value  submit  gt  x000D   x000D   x000D

User · Answer

It should be  yadayada val split   n     you re passing in a literal string to the split command  not a regex

User · Answer

You should parse newlines regardless of the platform  operation system  This split is universal with regular expressions  You may consider using this    var ks       keywords   val   split   r  n      E g    a nb r nc r nlala  split   r  n        a    b    c    lala

User · Answer

Try initializing the ks variable inside your submit function      function            document  ready function                data   submit function e              var ks       keywords   val   split   n               e preventDefault               alert ks 0                 each ks  function k                 alert k                                            jQuery

User · Answer

Move the var ks       keywords   val   split   n    inside the event handler Use alert ks k   instead of alert k         function            document  ready function                data   submit function e              e preventDefault               var ks       keywords   val   split   n               alert ks 0                 each ks  function k                 alert ks k                                             jQuery     Demo

User · Answer

Just  var ks       keywords   val   split   r n  n  r     will work perfectly   Be sure  r n is placed at the leading of the RegExp string  cause it will be tried first

User · Answer

Good ol javascript      var m    Hello World      var k   m split           I have used space  you can use any thing   for i 0 i lt k length i          alert k i

User · Answer

you don t need to pass any regular expression there  this works just fine     function              document  ready function                 data   click function e              e preventDefault                each    quot  keywords quot   val   split  quot  n quot    function e  element                alert element                                              jQuery

User · Answer

The problem is that when you initialize ks  the value hasn t been set    You need to fetch the value when user submits the form  So you need to initialize the ks inside the callback function   function          document  ready function              data   submit function e           Here it will fetch the value of  keywords          var ks       keywords   val   split   n                                     jQuery

User · Answer

Here is example with console log instead of alert    It is more convenient     var parse   function      var str      textarea   val      var results   str split   n        each results  function index  element       console log element               function         button   on  click   parse         You can try it here

[jquery] Javascript how to split newline

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