javascript code to check special characters

Question

I have JavaScript code to check if special characters are in a string  The code works fine in Firefox  but not in Chrome  In Chrome  even if the string does not contain special characters  it says it contains special characters   var iChars            amp    -                lt  gt      for  var i   0  i  lt  chkfile value length  i        if  iChars indexOf chkfile value charAt i      -1           alert   File name has special characters         amp    -                lt  gt    nThese are not allowed n         return false          Suppose I want to upload a file desktop zip from any Linux Windows machine  The value of chkfile value is desktop zip in Firefox  but in Chrome the value of chkfile value is c   fakepath desktop zip  How do I get rid of c   fakepath  from chkfile value

User · Answer

You could also do it this way   specialRegex      A-Z a-z0-9     specialRegex test  test       evaluates to true  Because if its not a capital letter  lowercase letter  number  or space  it could only be a special character

User · Answer

You can test a string using this regular expression   function isValid str    return             amp     -                  lt  gt     g test str

User · Answer

Did you write return true somewhere  You should have written it  otherwise function returns nothing and program may think that it s false  too   function isValid str        var iChars            amp    -                lt  gt          for  var i   0  i  lt  str length  i             if  iChars indexOf str charAt i      -1               alert   File name has special characters         amp    -                lt  gt    nThese are not allowed n               return false                     return true      I tried this in my chrome console and it worked well

User · Answer

Try This one    x000D   x000D  function containsSpecialCharacters str   x000D      var regex             amp       -                 lt  gt      g  x000D   return regex test str   x000D    x000D   x000D   x000D

User · Answer

Directly from the w3schools website      var str    The best things in life are free      var patt   new RegExp  e       var res   patt test str     To combine their example with a regular expression  you could do the following   function checkUserName         var username   document getElementsByName  username   value      var pattern   new RegExp            amp     -                  lt  gt          unacceptable chars     if  pattern test username             alert  Please only use standard alphanumerics            return false            return true    good user input

User · Answer

If you don t want to include any special character  then try this much simple way for checking special characters using RegExp  W Metacharacter   var iChars            amp    -                lt  gt     if   iChars match   W g                alert   File name has special characters         amp    -                lt  gt    nThese are not allowed n        return false

[javascript] javascript code to check special characters

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