I am currently doing homework, and following the instructions the book gives me, but I can't get the required or pattern tags to work. I am creating a survey form, and trying to make an error come up when the user doesn't type in their name, receipt number, or email. Here is a portion of it.
<label for"receipt">Receipt number *</label>
<input name="receipt" id="receipt"
placeholder="re-nnnnnn"
required="required"
pattern="^re\-\d{6}$" />
A few things i see
the required attribute does not need a value, the existence of the attribute is what makes it required or not.
the - does not need to be escaped so use ^re-\d{6}$ for the pattern attribute
the issue with the notepad++ is that the language formatting/color-coding is not up-to-date with all the attributes.
<input name="receipt" id="receipt"
placeholder="re-nnnnnn"
required pattern="^re-\d{6}$" />
there is no need to write like that u can just write : required and it will work
and whats your pattern i don't catch that
Related
So I'm trying to make a form for my assignment, and I am using the pattern attribute in html so only certain characters are required to be typed on the text box. But for some reason, the form is saying using that I'm using an incorrect format even though I made my pattern attribute that way.
Here's an example of the code and a picture of the problem.
<form>
<label for="mnumber">Mobile Number:</label>
<input type="text" required id="mnumber" pattern="[0-9]"><br><br>
<input type="submit" value="submit">
</form>
You did write:
pattern="[0-9]"
You are asking for only one number. You just forget to add '+' to accept more than one number. I guess what you are searching for is this:
pattern="[0-9]+"
pattern="[0-9]"
allows for only a single number character to validate (and be submitted). If you want to allow more than one character, here's your options:
One or more numbers:
pattern="[0-9]+"
Zero or more numbers:
pattern="[0-9]*"
One to three numbers:
pattern="[0-9]{1,3}"
you just need to change type="text" to type="number"
Is there any way to validate inputs in the form using HMTL?
For example:
<input type="text" class="input-text error"
aria-required="true" placeholder="Enter your name *"
aria-invalid="true" required />
If user adds a special character to input, an error message saying "Characters are not allowed" should be shown below the input box.
First of all, client-side form validation is the greatest feature coming with the HTML5. Client-side form validation helps you to ensure data submitted matches the requirements. To get more detail about it you can visit here.
Important Note
Client-side form validation is an initial check, You should not use data coming from the form on the server side without checking it. It just a feature for good user experience. Because client-side validation is too easy to manipulate, so users can still easily send data that you do not want to on your server.
Solution
In this question, the best solution is; using HTML attribute pattern. The pattern attribute defines a regular expression the form control's value should match. To get more detail about pattern attribute you can visit the this page.
Below regexp you need.
^[a-zA-Z0-9]{5,12}$
It works like that;
It should contains only alphanumeric.
Minumum 5 and maximum 10
character.
You can use below code to integrate it with input field.
<form action="">
<input type="text" name="name" required
pattern="[a-zA-Z0-9]{5,12}" title="No special character">
<input type="submit">
</form>
Usually, to check inputs from html tags, you can create a javascript function to check your needs which is called everytime the user type in your input with the "onkeyup()" function.
The "onkeyup" keyword will trigger the function everytime user type in your field
<input type="text" onkeyup="myFunctionToCheck()">
<script>
myFunctionToCheck(){
//Here check your needs
}
</script>
im currently trying to optimize my forms on my Webpage. The HTML Validator gives me the following error:
The autofill field name “postal-code” is not allowed in this context.
I dont know why, since it does what it should. The autofill inserts the Postal-code. Here is the Element:
<td><input type=number name="changeZip" min=00000 max=99999 autocomplete="postal-code"></td>
This Element has same Error:
<input class="login" type="number" name="txtZip" value="" required max="99999" min="00000" placeholder="Postleitzahl" autocomplete="postal-code"/>
Why isnt it allowed here according to the Error-Message? I dont find anything in Google for this.
Thanks.
The type attribute needs to be "text". Some countries use a combination of letters and numbers for their postal code.
Therefore, your input element should be
<input type="text" name="changeZip" minLength="5" maxLength="5" autocomplete="postal-code">
I want to programatically set the input to invalid if specific condition is met e.g
<input type="text" required />
Lets take a variable isValid an example, if that is false, i want that bubble to show up with default browser bubble (onsubmit) and the custom error thats provided. So to add custom errors i figured the solition
<input
type="text"
required
oninvalid="this.setCustomValidity('Please Enter valid name')"
oninput="setCustomValidity('')"
/>
However this only check if its empty, the extra validation comes from a field called pattern however that regex, so I was thinking maybe do a pretty much all case regex when is 'isValid == true' else a regex that will fall everytime e.g. (react)
<input
type="text"
required
pattern={isValid ? 'regex valid always' : 'regex fail always'}
...
/>
Could this even work? is there a better way that I'm not seeing?
Thanks to #revo for his help got it working with just:
<input
type="text"
required
pattern={isValid ? null : '(?!)'}
...
/>
I am using HTML5 for user validation. Here is a snippet of my code:
<input type="text" name="name" id="usernametb" title="Minimum 8 Characters, only letters
and numbers" pattern="^[A-Za-z0-9]{8,40}$" placeholder="Enter a Valid UserName" required />
I would like for user to get an error message either as soon as they type a username that doesnt match the validation pattern or when they tab to next field. Is there an easy way to do this with HTML5.
Right now, the error message doesn't display until I click "submit" and force a postback.
I have had good experiences with the parsley.js library:
http://parsleyjs.org/
Also for other input types (eg phone, email, URL) html5 can validate by itself, won't fix the example you have but it is very powerful and an insanely lightweight tool when it fits.
eg:
<input type="tel" name="cellPhone"></input>
Good luck!
This is a html5 validation plugin for jquery: http://ericleads.com/h5validate/ .
Quote from the plugin site:
Best practice realtime HTML5 form validation for jQuery. Works on all popular browsers, including old ones like IE6.
If you want to use your own javascript, use something like:
onkeyup="validateUsername(this)"
…so for example:
<input type="text" name="name" id="usernametb" title="Minimum 8 Characters, only letters and numbers" pattern="^[A-Za-z0-9]{8,40}$" placeholder="Enter a Valid UserName" onkeyup="validateUsername(this)" required />
Happy coding!