javascript - How to disable or prevent the space key entry on web form - Stack Overflow

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I want to only allow letters of the alphabet and numbers to be entered in a form field. I have tried many variations using regex, etc. and I cannot disable the space key or any special character keys.

Here is the latest copy of my code:

document.querySelector('#upperCase').addEventListener('keyup', function(e) {
  console.log(this.value);
  if (e.which == '32') return false;
  this.value = this.value.toUpperCase();
});

#upperCase {
  text-transform: uppercase;
}

<form>
  <input id="upperCase" maxlength="10" name="upperCase" type="text">
</form>

I want to only allow letters of the alphabet and numbers to be entered in a form field. I have tried many variations using regex, etc. and I cannot disable the space key or any special character keys.

Here is the latest copy of my code:

document.querySelector('#upperCase').addEventListener('keyup', function(e) {
  console.log(this.value);
  if (e.which == '32') return false;
  this.value = this.value.toUpperCase();
});

#upperCase {
  text-transform: uppercase;
}

<form>
  <input id="upperCase" maxlength="10" name="upperCase" type="text">
</form>

Is it possible to only allow letters and number to be keyed into an input text box?

Here is my jsfiddle: https://jsfiddle/bcjg7osr/29/

• javascript
• regex
• html

Share Improve this question Follow edited Sep 6, 2018 at 0:49 Syfer 4,50933 gold badges2222 silver badges3838 bronze badges asked Sep 5, 2018 at 20:21 jdoejdoe 5311 silver badge44 bronze badges

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4 Answers 4

Sorted by: Reset to default 3

One way you can do it is using the pattern attribute on your input. The only problem with the patter attribute is that it won't disallow spaces until the form is submitted, in which case the submission won't work and the user will be asked to change the input. This will only allow letters and numbers.

<input pattern = "[A-Za-z0-9]" id="upperCase" maxlength="10" name="upperCase" 
type="text">

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