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.
Related
I've got this html:
<h5>
Select IMDB Rating
</h5>
<input type="radio" id="rdbtnAllIMDB"</input>
<label for="rdbtnAllIMDBA">All</label>
<p><input type="radio" id="rdbtnGOE" checked="checked"</input>
<label for="rdbtnGOE"> >= </label>
<input type=number step=0.1 value="7.5" size="4"</input></p>
...and, altough set to size 4, the input number is quite wide:
...and it doesn't change one way or the other with changes to the value given "size"
The same trick (adding a small size value) works just fine here.
What am I doing wrong?
Definition of input size From MDN Web Docs:
Valid for email, password, tel, and text input types only. Specifies
how much of the input is shown. Basically creates same result as
setting CSS width property with a few specialities. The actual unit of
the value depends on the input type. For password and text, it is a
number of characters (or em units) with a default value of 20, and for
others, it is pixels. CSS width takes precedence over size attribute.
Therefore, it will not work for input of type="number"
The reason you are not seeing changes is that you have to set the min and max value. If you don't set the value of min and max, this input box will set its width in such a way that the highest limit number can be seen completely.
The size attribute will help you set the width of the input box based on the same concept described above of not loosing the view port of the value in input boxes. But, it won't be supported when the step function is used with input type number.
<h5>
Select IMDB Rating
</h5>
<input type="radio" id="rdbtnAllIMDB"</input>
<label for="rdbtnAllIMDBA">All</label>
<p><input type="radio" id="rdbtnGOE" checked="checked"</input>
<label for="rdbtnGOE"> >= </label>
<input type=number step=0.1 value="7.5" min="0" max="10"</input></p>
As "95faf8e76605e973" (apparently a Welshman or a Finn) said, you can't get there from there.
This CSS works, though:
input[type=number] {
width: 64px;
}
Now my input number widgets look like so:
Say I have the following HTML:
<form>
Fax #: <input type="number" name="fax" minlength="10" required />
<button>Print</button>
</form>
If I enter in "11" as the Fax # and hit "Print" the form submits without issue. I would like it to present some sort of error. If the minlength attribute doesn't do that then what exactly does the minlength attribute do?
I'm using Google Chrome 74..
The minlength attribute doesn't apply for input of type number. This is actually quite reasonable. Numbers don't have a length, text do. For reference, see The official documentation.
Using input type="number" for a fax field is semantically incorrect, anyway. You should use input type="text". Then you can limit its length by the maxlength or minlength attributes or even use the pattern one.
If you absolutely need to use number as input type and you need to limit the value to 10 digits, you can do it by using min and max attributes:
Fax #: <input type="number" name="fax" min="1000000000" max="9999999999" required />
Like I said, though, this is absolutely incorrect semantically.
<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.
Why won't my input resize when I change the type to type="number" but it works with type="text"?
EXAMPLE
Email: <input type="text" name="email" size="10"><br/>
number: <input type="number" name="email" size="10">
Seem like the input type number does not support size attribute or it's not compatible along browsers, you can set it through CSS instead:
input[type='number']{
width: 80px;
}
Updated Fiddle
Incorrect usage.
Input type number it's made to have selectable value via arrows up and down.
So basically you are looking for "width" CSS style.
Input text historically is formatted with monospaced font, so size it's also the width it takes.
Input number it's new and "size" property has no sense at all*. A typical usage:
<input type="number" name="quantity" min="1" max="5">
w3c docs
to fix, add a style:
<input type="number" name="email" style="width: 7em">
EDIT: if you want a range, you have to set type="range" and not ="number"
EDIT2: *size is not an allowed value (so, no sense).
Check out official W3C specifications
Note: The size attribute works with the following input types: text,
search, tel, url, email, and password.
Tip: To specify the maximum number of characters allowed in the
element, use the maxlength attribute.
Rather than set the length, set the max and min values for the number input.
The input box then resizes to fit the longest valid value.
If you want to allow a 3-digit number then set 999 as the max
<input type="number" name="quantity" min="0" max="999">
For <input type=number>, by the HTML5 CR, the size attribute is not allowed. However, in Obsolete features it says: “Authors should not, but may despite requirements to the contrary elsewhere in this specification, specify the maxlength and size attributes on input elements whose type attributes are in the Number state. One valid reason for using these attributes regardless is to help legacy user agents that do not support input elements with type="number" to still render the text field with a useful width.”
Thus, the size attribute can be used, but it only affects older browsers that do not support type=number, so that the element falls back to a simple text control, <input type=text>.
The rationale behind this is that the browser is expected to provide a user interface that takes the other attributes into account, for good usability. As the implementations may vary, any size imposed by an author might mess things up. (This also applies to setting the width of the control in CSS.)
The conclusion is that you should use <input type=number> in a more or less fluid setup that does not make any assumptions about the dimensions of the element.
What you want is maxlength.
Valid for text, search, url, tel, email, and password, it defines the maximum number of characters (as UTF-16 code units) the user can enter into the field. This must be an integer value 0 or higher. If no maxlength is specified, or an invalid value is specified, the field has no maximum length. This value must also be greater than or equal to the value of minlength.
You might consider using one of these input types.
Use min and max value instead of using size for "number" type, Input box size will be auto adjusted according to max value.
eg:
number:
Use an on onkeypress event. Example for a zip code box. It allows a maximum of 5 characters, and checks to make sure input is only numbers.
Nothing beats a server side validation of course, but this is a nifty way to go.
function validInput(e) {
e = (e) ? e : window.event;
a = document.getElementById('zip-code');
cPress = (e.which) ? e.which : e.keyCode;
if (cPress > 31 && (cPress < 48 || cPress > 57)) {
return false;
} else if (a.value.length >= 5) {
return false;
}
return true;
}
#zip-code {
overflow: hidden;
width: 60px;
}
<label for="zip-code">Zip Code:</label>
<input type="number" id="zip-code" name="zip-code" onkeypress="return validInput(event);" required="required">
change type="number" to type="tel"
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.