check file ext

hi i need to check my file ext before i upload, at the moment it does not work??


            <!---check its a image--->            
            <cfset allowfiles = "jpg,jpeg,gif,png">      
            <cfif listfindnocase(allowfiles,'form.image')>
            <cfset error = "Error: An articsdvfdst">
            </cfif>
LVL 12
pigmentartsAsked:
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dgrafxConnect With a Mentor Commented:
can't do it that way
<script>
function fileType(field) {
var ok = true;
var Extensions = ".jpg,.gif";      
      
if(field!=null && field.value.length) {
      dots = field.value.split(".")
      thisType = "." + dots[dots.length-1]
      thisType = thisType.toLowerCase()            
      if(Extensions.toLowerCase().indexOf(thisType) == "-1") {
            ok = false;                        
      }
}      
      if(!ok) {
      alert("File Type is Not Allowed.\nUse "+Extensions+" Only.")
      return false
      }
      
}
</script>
<input type="file" name="imgfile" onblur="fileType(this)">

but if user doesn't have js enabled then you need to use CF
<cfif Not listfindnocase(Extensions,cffile.serverFileExt)>
File is not allowed :)
</cfif>
you'd do this after your cffile action="upload"
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trailblazzyr55Connect With a Mentor Commented:
you could check using the ListFindNoCase() method however in your method you have to specify the delimeter as ".", default is a "," so this would be more correct...

<cfif not listFindNoCase(extList,cffile.serverFileExt,".")>
   Not Allowed
</cfif>

however, you can also filter/allow certain files to be uploaded in the cffile tag as well..., and therefore you wouldn't have to do this check above...
well you could to display a message to the user or something...

<cffile
  action = "upload"
  fileField = "form.field"
  destination = "you_absolute_path"
  nameConflict = "MakeUnique"
  accept = "image/jpg, image/jpg, image/jpeg, image/gif, image/png">
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trailblazzyr55Commented:
please ignore the duplicate image/jpg in the accept attib... this is more correct

<cffile
  action = "upload"
  fileField = "form.field"
  destination = "you_absolute_path"
  nameConflict = "MakeUnique"
  accept = "image/jpg, image/jpeg, image/gif, image/png">
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pigmentartsAuthor Commented:
thanks,

used both


doe the cf check first then just in case done,

 accept = "image/jpg, image/jpeg, image/gif, image/png">
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