Remove the space between the left and right sides of the string (Implementation code) _javascript tips

In daily work, filtering the special characters in the form is a very common function, such as the text required to enter a simple number, but the user sometimes mistakenly input some extra space or other characters mixed text, which obviously does not meet the input requirements.

Let's learn how to remove the space between the left and right sides of the string.

Before filtration:

　　

After filtration:

　　

HTML code:

 <div class= "main" >
     <input id= "UserName" type= "text" placeholder= "Please enter username" >
     <input id= "rule" Type= "button" value= "Filter" >
   </div>

CSS code:

html,body,div,input{margin:0;padding:0}
    . main{width:400px;height:auto;padding:0 15px;text-align:center}
    . Main input{width:100%;height:35px;border:none;margin-top:20px;border-radius:5px;}
    Input[type= "text"]{text-align:left;padding-left:15px;box-sizing:border-box;border:1px solid blue;
    Input[type= "button"]{width:50%;background:blue;}
    @media only screen and (max-width:415px) {
      . Main{width:100%;box-sizing:border-box}}
    

JS section:

var userName = document.getElementById (' UserName '),
        rule   = document.getElementById (' rule '),
        Regexempty =/^ (\s|\u00a0) +| (\s|\u00a0) +$/g;

    Rule.onclick = function () {
      username.value = userName.value.replace (Regexempty, ');//replace
      Console.log ( Username.value);
    }

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