I have a number input field in HTML.
<input type="number" value="0">
and I'd like for the user to not be able to type more than five characters into the textbox.
I've used the maxlength attribute before when the type is set to text, but that doesn't work with the number attribute. Is there a relatively simple solution (inline HTML is preferred) to overcome this and limit the number of characters?
Thanks.
If you want a maximum of 5 digits in the number, you can use the largest 5 digit number and set that as the max attribute for the input:
<input type="number" max="99999" />
The above will only maximize the number to 99999, but will not disallow input of more than 5 characters. This can't be done with HTML alone.
It can, though, be done with JavaScript. For example:
<input oninput="javascript: if (this.value.length > this.maxLength) this.value = this.value.slice(0, this.maxLength);"
type="number"
maxlength="5"
/>
All the code above does is, oninput, it checks the number of characters in the input, and if that is exceeding the number of characters specified in maxlength, it deletes the character.
Source: maxlength ignored for input type="number" in Chrome
Related
How to ensure between 7 and 10 digits are entered using pattern attribute in HTML? I have following code:
<input type="number" name="Student" id="studID" required pattern="\d{7,10}" />
The number type of input elements does not support a pattern attribute:
See the MDN documentation in <input type="number">
In addition to the attributes commonly supported by all types, inputs of type number support these attributes:
Attribute Description
max The maximum value to accept for this input
min The minimum value to accept for this input
placeholder An example value to display inside the field when it's empty
readonly A Boolean attribute controlling whether or not the value is read-only
step A stepping interval to use when using up and down arrows to adjust the value, as well as for validation
<input type="text"> has the pattern attribute.
You could use the min and max attributes like so.
<input type="number" name="Student" id="studID" min="1000000" max="9999999999">
<input type="number" name="Student" id="studID" minlength="7" maxlength="10">
should solve the problem you're having
You can add pattern attribute like this:
<input type="number" name="Student" id="studID" required pattern="7-10" />
<input class="form-control" th:type="number" th:maxlength="4" id="code" th:field="*{code}" th:value="${code}" />
On my HTML5 page the above input field prevents alphanumerical characters to be inputed, but does not limits the length to 4 characters.
How to fix?
You need to change input type "number" to "text"
th:maxlength="4" won't work on th:type="number" its only works on th:type="text".
No need to change the input type from number to text. The input type number doesn't have the maxlength attribute(See: HTML DOM Input Number Object). Instead you should use min and max attributes. So your html should look like,
<input class="form-control" th:type="number" th:max="4" id="code"
th:field="*{code}" th:value="${code}" />
Now it will allow only to input numbers with a max value of 4.
I am pretty new in HTML and I have the following problem. Into a page I have an input tag like this:
<input id="codiceFiscaleEnte" class="form-control" name="numeroProtocollo" type="number" th:value="*{codiceFiscaleEnte}" required="required"></input>
and I have to do some validation on it.
So I know that the required="required" attribute means that the user have to insert a value for this field and that the type="number" specify that this value have to represent a number.
Can I specify in some way that this number has to be composed by exactly 11 digits? How can I do it using HTML attributes?
Use pattern:
<input type="text" name="numeroProtocollo" required pattern="[0-9]{11}">
It allows only numbers with a minimum and maximum length of 11
Test it:
https://jsfiddle.net/oegjdszx/1/
Use the pattern like this
<input pattern="[0-9]{5}">
Where 5 is the number of digits that you want.
<input type="number" min="10000000000" max="99999999999" required>
min and max attributes specify the smallest and largest valid values. An 11 digit number is a number between 10^10 and (10^11 - 1), so set min and max to those values
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.
I have created an input box using <input type="text" name="username"> for user to input username, then i have fixed the length to 5 for some calculation.
<input type="text" name="username" maxlength="5">. but when i given the input as static text then it will accept any number of characters.
Setting max length to 5 means that the input box will hold only 5, then why it holds more than 5 letters when given like this?
<input type="text" name="username" maxlength="5" value="12345678910">
According to w3schools,
Maxlength eflects the maxlength HTML attribute, containing the maximum length
of text (in Unicode code points) that the value can be changed to. The
constraint is evaluated only when the value is changed
The key here is that it is only evaluated when the value is changed. You can set the value to anything when you're creating the element. The effect will take place after you change it. Try changing the input from your example, and you'll see that it does cap it at 5 characters.