I have a input form with pattern attribute. I see that there I can add this for example
pattern="2222"
And the input field will take only this value, now I want to add more values, for example I want to accept 10 values. How to do that?
Better use javascript. Use this code
<script language="JavaScript" type="text/javascript">
function checkcode ( form )
{
var pattern = /name="code" value="|value|value1|value2|"/g
if (!pattern.test(form.code.value)) {
alert( "The code is incorrect." );
form.code.focus();
return false ;
}
return true ;
}
</script>
You should use a select, or regular expressions matching whatever you want to match.
The pattern attribute can accept a Regular Expression, for example:
<input type="text" name="country_code" pattern="[A-Za-z]{3}" />
The above input will accept only 3 alphabetical (regardless of case) charaacters. If you only want to allow 4-digit numbers, use:
<input type="text" name="country_code" pattern="[0-9]{4}" />
Related
I am using the jQuery.validator.addClassRules method to validate my input fields. How do I allow my textbox to accept only comma seperated values and show the default message if incorrect.
<input type="text" class="form-control numberValidation" />
<!-- JS Plugins Init. -->
<script>
$(document).on('ready',
function () {
$("#signupform").validate({
errorClass: 'invalid-input'
});
jQuery.validator.addClassRules('numberValidation',
{
number: true
});
});
</script>
If you combine this answer which shows you how to validate with a regular expression with this answer that contains regex examples for comma separated integers, that should meet your needs.
There is a similar question which limits the number of characters for allowed in a form input.
In my case I want to limit the number of digits that can be added after the decimal point to 2 digits.
<input type="text" maxlength="2"/>
Is there a way to limit the digits after a decimal point (.) ?
As I am not aware of any way to do it in HTML…
Here is how I'll do it with some JavaScript, using a RegEx to delete the extra decimals:
var myInput = document.querySelector('#fixed2');
myInput.addEventListener("keyup", function(){
myInput.value = myInput.value.replace(/(\.\d{2})\d+/g, '$1');
});
<input id="fixed2" type="text" />
Note that I used the keyup event here, so that you can see the automatic deletion. But it works great with input too!
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We could generalize this method to work with multiple inputs, using a custom attribute like decimals:
(I'm using input event here, so you see the difference)
var myInputs = document.querySelectorAll('.fixed');
myInputs.forEach(function(elem) {
elem.addEventListener("input", function() {
var dec = elem.getAttribute('decimals');
var regex = new RegExp("(\\.\\d{" + dec + "})\\d+", "g");
elem.value = elem.value.replace(regex, '$1');
});
});
<input class="fixed" type="text" decimals="2" placeholder="2 decimals only" />
<br><br>
<input class="fixed" type="text" decimals="3" placeholder="3 decimals only" />
Hope it helps.
I think best option is to resovle this with jQuery validator, where you can add requirments for each field that you are using. If you are trying to resovle this with HTML5 it might happen that in some browsers it will not work in a way you want.
Check this --> https://jqueryvalidation.org/
--> https://jqueryvalidation.org/maxlength-method/
If you are comfortable using scripts, then you may try the following approach:
$(document).ready(function() {
$("input").on("blur", function() {
$(this).val(parseFloat($(this).val()).toFixed(2));
})
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="number" step="0.01" min="0" />
The following solution works with number inputs and therefor defends against alphabetical characters (unlike the currently accepted answer):
function limitDecimalPlaces(e, count) {
if (e.target.value.indexOf('.') == -1) { return; }
if ((e.target.value.length - e.target.value.indexOf('.')) > count) {
e.target.value = parseFloat(e.target.value).toFixed(count);
}
}
<input type="number" oninput="limitDecimalPlaces(event, 2)" />
Note that this cannot AFAIK, defend against this chrome bug with the number input.
I have multiple field in my form like
<input type="text" pattern="[0-9]+([\.,][0-9]+)?" step="any" oninvalid="setCustomValidity('Enter decimal value')" required>
can I create something like required ex decimal so that I do not have to write a pattern and custom message every time?
You can do something like this,
In case you have many fields having the same pattern you can either give the same class Name for all these fields,or the same name for all those fields,
It would be necessary to do the above in order to identify all these kind of fields together,For example,
HTML Code:
<input type="text" step="any" class="patternText" oninvalid="setCustomValidity('Enter decimal value')" required>
JS Code:
var patternFields=document.getElementByClassName("patternText");
for(var i=0;i<patternFields.length;i++) {
patternFields.pattern="[0-9]+([\.,][0-9]+)?";
patternFields.oninvalid = function(event) {
event.target.setCustomValidity('Username should only contain lowercase letters. e.g. john');
}
}
Based on Example here:
$.validator.addMethod('Decimal', function(value, element) {
return this.optional(element) || /^\d+(\.\d{0,3})?$/.test(value);
}, "Please enter a correct number, format xxxx.xxx");
I have a textbox in a form, and I would like to set the maximum allowed number value to be 50. Is this possible with HTML? Thanks
Yes. Use maxlength attribute.
<input type="text" size="10" maxlength="50">
EDIT: I misunderstood your question. If you want it so that the max number is 50 and it accepts nothing else you should just check the value that is accepted in the input and if it is greater than 50, you can do something (clear the textbox, throw an error, apply an error class, etc). Maybe write a function to tell if it is a number and is <= 50?
function isValidNum(n) {
if (!isNaN(parseFloat(n)) && isFinite(n) && n<=50)
//do something
}
From HERE
I think you are looking for the maxlength attribute:
<input type="text" maxlength="10">
you could do it with javascript on the onblur event
function txtOnBlur(txt){
if (txt.value >50){
txt.value = "";
alert("No values over 50");
}
}
add add the onBlur="javascript:txtOnBlur(this);" attribute to your textbox.
If it's the char lenght, just add teh maxlenght attribute (maxlength="50").
As far as I understand, what you are looking for is more like this: Limit input box to 0-100
Crimson has submitted an answer that sounds exactly as the code you need. Edited and refined for your need, it will become:
<script>
function handleChange(input) {
if (input.value < 0) input.value = 0;
if (input.value > 50) input.value = 50;
}
</script>
And your textbox would look something like this:
<input type="text" onChange="handleChange(this)" />
You want this:
<input type="number" min="1" max="50" />
Thus 51 is too high. 50 is okay. This is a HTML5 attribute.
Maxlengh will allow 50 characters aka a number with 49 zeros after it. Which I don't think was what you mean.
Max will allow the input to have a value of no higher than specified.
You will still need to validate it server side how ever.
What are the ways to get and render an input value using jQuery?
Here is one:
$(document).ready(function() {
$("#txt_name").keyup(function() {
alert($(this).val());
});
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.4.3/jquery.min.js"></script>
<input type="text" id="txt_name" />
//Get
var bla = $('#txt_name').val();
//Set
$('#txt_name').val(bla);
You can only select a value with the following two ways:
// First way to get a value
value = $("#txt_name").val();
// Second way to get a value
value = $("#txt_name").attr('value');
If you want to use straight JavaScript to get the value, here is how:
document.getElementById('txt_name').value
There is one important thing to mention:
$("#txt_name").val();
will return the current real value of a text field, for example if the user typed something there after a page load.
But:
$("#txt_name").attr('value')
will return value from DOM/HTML.
You can get the value attribute directly since you know it's an <input> element, but your current usage of .val() is already the current one.
For the above, just use .value on the DOM element directly, like this:
$(document).ready(function(){
$("#txt_name").keyup(function(){
alert(this.value);
});
});
You have to use various ways to get current value of an input element.
METHOD - 1
If you want to use a simple .val(), try this:
<input type="text" id="txt_name" />
Get values from Input
// use to select with DOM element.
$("input").val();
// use the id to select the element.
$("#txt_name").val();
// use type="text" with input to select the element
$("input:text").val();
Set value to Input
// use to add "text content" to the DOM element.
$("input").val("text content");
// use the id to add "text content" to the element.
$("#txt_name").val("text content");
// use type="text" with input to add "text content" to the element
$("input:text").val("text content");
METHOD - 2
Use .attr() to get the content.
<input type="text" id="txt_name" value="" />
I just add one attribute to the input field. value="" attribute is the one who carry the text content that we entered in input field.
$("input").attr("value");
METHOD - 3
you can use this one directly on your input element.
$("input").keyup(function(){
alert(this.value);
});
I think this function is missed here in previous answers:
.val( function(index, value) )
You can get the value like this:
this['inputname'].value
Where this refers to the form that contains the input.
To get the textbox value, you can use the jQuery val() function.
For example,
$('input:textbox').val() – Get textbox value.
$('input:textbox').val("new text message") – Set the textbox value.
You can simply set the value in text box.
First, you get the value like
var getValue = $('#txt_name').val();
After getting a value set in input like
$('#txt_name').val(getValue);
For those who just like me are newbies in JS and getting undefined instead of text value make sure that your id doesn't contain invalid characters.
Try this. It will work for sure.
var userInput = $('#txt_name').attr('value')
You can try
let quantity = $('input[name = quantity]').val()
where the name of the input field is quantity
Shortest
txt_name.value
txt_name.onkeyup = e=> alert(txt_name.value);
<input type="text" id="txt_name" />