javascript - Textarea hashtag highlight is applied to the wrong position after the first line -

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when going newline , starting hashtag there beginning of line, highlighter applying color previous line.

  <style>         #input{             color: transparent;         }         #input b{             text-decoration: none;             color: transparent;             background-color: #9aceff;             font-weight: normal;         }         #t{           background-color: transparent;                     }     </style> 
<textarea id="t" style="width: 342px; height: 92px; resize: none; position: absolute; z-index: 1; border: 1px solid #212;font-family: arial; padding: 20px; margin: 0; font-size: 12px;"> </textarea> <div style="width: 300px; height: 50px; border: 1px solid #212; font-family: arial; padding: 20px; position: absolute; z-index: 0; margin: 0; font-size: 12px;" id="input">  </div> 
<script> $(document).ready(function(){    $('#t').on('input keyup', function() {        var str = $(this).val();               str = str.replace(/(<.+?>)/gi, '');                str = str.replace(/(?:\s|^)#([^0-9\w\s][a-za-z0-9]*)/g, ' <b>#$1</b>');               str = str.replace(/(?:\r\n|\n\r|\r|\n)/g, '<br />');               $('#input').html(str);    }); }); </script>

here jsfiddle code.

the problem you're facing here regex replacing newline characters space before final replacement of newline characters <br /> elements occurs.

as result, in cases hashed string preceded newline, highlight appear on previous line, rather correctly being placed on same line hashed string.

a quick fix swap last 2 string replacements, , add space after <br /> avoid being included in hashed string:

$(document).ready(function(){    $('#t').on('input keyup', function() {        var str = $(this).val();               str = str.replace(/(<.+?>)/gi, '');        str = str.replace(/(?:\r\n|\n\r|\r|\n)/g, '<br /> ');        str = str.replace(/(?:\s|^)#([^0-9\w\s][a-za-z0-9]*)/g, ' <b>#$1</b>');               $('#input').html(str);    }); });

here's updated jsfiddle demonstrate. hope helps! let me know if have questions.


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