maximum file length?

**lukeurtnowski** · Mar 29, 2007 12:50

I have a form which allows uploads of image files, how do I check to make sure the name of that file is less than 30 characters?

**Raffles** · Mar 29, 2007 13:05

Code:

var inp = document.getElementById('theformcontrol');
inp.onblur = function() {
  if (this.value.length > 30) alert('filename is too long');
}

Maybe not onblur but onchange, it's up to you.

**lukeurtnowski** · Mar 29, 2007 14:35

Well, the form controls are Image[1]- Image[6], so I should place this in my <head>

HTML Code:

<script>
for(x=1;x>6;x++) {
var inp = document.getElementById('Image["+x+"]');
inp.onchange = function() {
  if (this.value.length > 30) alert('filename of image #"+x+"is too long');
}
}
</script>

Thanks...

**Raffles** · Mar 29, 2007 15:28

Well, if you want to do this for all of them, then you can just do it via the parent, if there is one. For example, if these 6 form controls are in a fieldset with the id "formcontrols". Presumably they are all <input> elements of type "text". Also, if it's going in the head you need to do this onload. And I think you mean x<6, not x>6.

Code:

<script>
window.onload = function() {
  var f = document.getElementById('formcontrols').getElementsByTagName('input');
  for(x=0;x<5;x++) {
    f[x].onchange = function() {
      if (this.value.length > 30) alert('filename of image #"+(x+1)+"is too long');
    }
  }
}
</script>

**lukeurtnowski** · Mar 29, 2007 18:12

the alert statement is off, it doesn't alert the value, just(x+1)
Thanks

**Raffles** · Mar 29, 2007 18:26

You should be able to work this one out by yourself. Think about how strings can be defined.

User Tag List

Thread: maximum file length?

Thread Tools

Display

maximum file length?

Bookmarks

Bookmarks

Posting Permissions