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How can I remove extra white space in a string in JavaScript?

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故里飘歌
故里飘歌 2021-02-09 01:47

How can I remove extra white space (i.e. more than one white space character in a row) from text in JavaScript?

E.g 

match    the start using.
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  • 北恋
    2021-02-09 02:16

    Using regular expression.

    var string = "match    the start using. Remove the extra space between match and the";
string = string.replace(/\s+/g, " ");

    Here is jsfiddle for this

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  • 谎友^
    2021-02-09 02:18

    This can be done also with javascript logic.
    here is a reusable function I wrote for that task.
    LIVE DEMO

    <!DOCTYPE html>
<html>
  <head>
  </head>
  <body>
    <div>result: 
      <span id="spn">
      </span>
    </div>
    <input type="button" value="click me" onClick="ClearWhiteSpace('match    the start using.  JAVASCRIPT    CAN    BE   VERY  FUN')"/>
    <script>
      function ClearWhiteSpace(text) {
        var result = "";
        var newrow = false;
        for (var i = 0; i < text.length; i++) {
          if (text[i] === "\n") {
            result += text[i];
            // add the new line
            newrow = true;
          }
          else if (newrow == true && text[i] == " ") {
            // do nothing
          }
          else if (text[i - 1] == " " && text[i] == " " && newrow == false) {
            // do nothing
          }
          else {
            newrow = false;
            if (text[i + 1] === "\n" && text[i] == " ") {
              // do nothing it is a space before a new line
            }
            else {
              result += text[i];
            }
          }
        }
        alert(result);
        document.getElementById("spn").innerHTML = result;
        return result;
      }
    </script>
  </body>
</html>
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  • 日久生厌
    2021-02-09 02:26

    Try this regex

    var st = "hello world".replace(/\s/g,'');

    or as a function

        function removeSpace(str){
      return str.replace(/\s/g,'');
    }

    Here is a working demo

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