Javascripts > Javascript Forms > Input Box Restrictions
Script Title: Input Box Restrictions
Description: This form validation JavaScript restricts the number of characters allowed inside an input field. Great for preventing people from overloading the form.
Example: Available
Copy the following code into your <HEAD></HEAD> tags.<!--Add other form elements into form as desired--> <script> <!-- /* Visit http://java-scripts.net or http://wsabstract.com For this script and more */ function checkchars(cur){ //change max length to determine below var maxlength=50 if (cur.chars.value.length>maxlength){ alert("Please restrain your input to 50 or less characters!") return false } } //--> </script>
Copy the following code between the <BODY></BODY> tags of your html page.<form onsubmit="return checkchars(this)"> <strong>In 50 chars or less, please type a short description of yourself:</strong><br><textarea rows="5" cols="38" name="chars"></textarea> <br><input type="submit" value="Submit!"> </form>
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