I want a input box where it can only have alphabets and numbers with minimum number of letters of 4 and max of 20. To do this, I have the following code.
<input type="text" name="sample" pattern="[a-zA-Z0-9].{4,20}" />
This pattern attribute is preventing me from submitting the form. When I type something more than one letter, it tells me to match the required format.
What am I doing wrong? How can I have this form only take alphabets and numbers from 4-20 letters?
You are using the wildcard . in your pattern. It is what is being matched 4 to 20 times. Try
<input type="text" name="sample" pattern="[a-zA-Z0-9]{4,20}" />
Demo: http://jsfiddle.net/fwt2cj3o/
Related
Abit annoying to work with since I cannot seem to get this right.
I need to get a pattern that accepts exactly 12 characters containing upper case letters and numbers. Nothing more nor less than 12 characters.
<input type="text" placeholder="Licence Number.." pattern="[A-Z0-9]+" maxlength="12" minlength="12" title="Enter Licence number">
I am going about this in a wrong way because everytime I am entering 12 characters it is activating the validation message.
You can remove the minlength attribute and use the pattern [A-Z0-9]{12} instead:
input:invalid {
color:red;
}
<input type="text" placeholder="Licence Number..." pattern="[A-Z0-9]{12}" maxlength="12" title="Enter Licence number">
The minlength attribute is not needed using the above pattern. The maxlength attribute isn't also needed with the above pattern but it stops the input after 12 chars.
At the moment your pattern allows all license numbers with at least one upper case letter or number.
I believe what you are missing in your regular expression is an exact count. Your regex will match if any input character matches your specification at least once. This means that no matter how long your input is, or how many "illegal" characters there are, if just one uppercase letter or digit is input, the regex will match.
The following will check for exactly 12 of any uppercase letter or digit.
[A-Z0-9]{12}
I have a page with some text fields and I would like to restrict user input, so I have used the html5 pattern attribute, like so:
<input name="team_name" type="text" pattern="[A-Za-z]{50}" value="<?php echo $team_name;?>">
This should allow me to enter only letters b/w Aa-Zz for a name, but when I try to enter a valid name, it still tells me to match the requested format.
What am I missing? How come it is always telling me that my input is invalid?
The rule [A-Za-z]{50} will make the name acceptable only when it contains exact 50 alphabets.
[A-Za-z]{10,50}
This will make the name minimum 10 and maximum 50 characters.
Update the expression according to your requirements.
Demo:
input:invalid {
color: red;
}
<form>
<input name="team_name" type="text" pattern="[A-Za-z]{10,50}" value="">
<br />
<input type="submit">
</form>
{50} in a regex pattern means exactly 50 characters. That's unlikely what you want.
If you want to restrict the input to maximum 50 characters, use the maxlength attribute.
<input name="team_name" type="text" pattern="[A-Za-z]+" maxlength="50">
As you can see in the following :
type="text" -> text validation happen.
pattern="[A-Za-z]{50}" -> only Aa - Zz alphabets are valid, character inputs are not valid. and string length should be equal to 50.
Would like a HTML number field where the user can enter numbers separated by commas and spaces... like '1, 2, 3.' Right now it only accepts inputs without commas and spaces and won't let me submit the form with commas/spaces in the field.
Here's a sample of my simple input field now:
<input id="A" name="HLA-A" type="number" />
Need number field so number keyboard will pop up on smart phones.
Did a good bit of looking and I'm surprised I didn't find anything on this... perhaps there is a simple answer? Anyone have any ideas?
Thanks!
If you REALLY need type="number", then you should do as follows:
<input type="number" />,<input type="number" />,<input type="number" />
Otherwise, you could do as follows:
<input type="text" pattern="\d+, \d+, \d+" />
Both ways, some browsers may not support it.
I'm writing a HTML form that submits through PHP and I'm wondering if there is a way to set a minimum number of characters in a number input?
For instance, for an Irish mobile phone number it needs to be exactly 10 digits. Is there a way to set this?
you can use HTML pattern Attribute with a regexp
<input type="text" name="phone number"
pattern="[A-Za-z]{10}" title="ten letter country code">
for regexp only numbres use this :
[0-9]{10}
Use regular expressions . It forces the user to enter 10 numbers between 0-9
Exact 10 letter /^[0-9]{10}/
<input type="number" pattern="[0-9]{10} "/>
I want to prevent the user from entering non-numeric characters in a textfield for telephone number in HTML5. I tried this, but it doesn't forbid non-numeric characters:
<input type="tel" name="usrtel"><br>
I tried using type=number as well, but that gives me a up and a down arrow to increase or decrease the value, which is not useful for telephone numbers. How can I accomplish this?
You can use pattern attribute with a regex \d*
<input type="tel" name="usrtel" pattern="\d*" />
Demo (After typing in the box, just click anywhere outside the box, if you type in anything except the integers, it will show a red box, else it will stay normal)
Demo 2 (With custom message and submit button)
As you commented, you can change your pattern value to ^[0-9]{3,45}$ where user will have to input minimal of 3 digits to maximum of 45 in length.
Demo
<input
type="tel"
name="usrtel"
pattern="^[0-9]{3,45}$"
title="You can only enter numbers, with a minimal of 3 characters
upto 45 characters are accepted."
required="required"
/>
In the above markup, am using a title which will throw a custom error to your user.