I am using angular material with reactive form where i have an input field of type number. I want to limit the value that user can enter in the textbox from 1 to 99. I am able to achieve this but i see the value for a fraction of seconds after key up and then the value is sliced as i have written the slice logic inside the keyup event. I tried writing this logic in keypress but it does not seem to work. I tried using event.stopPropogation() and preventDefault but no luck. Below is the code:
<input type="number"
matInput
min="1"
max="99"
#tempVar
autocomplete="off"
formControlName="noOfWeeks"
(keyup)="imposeMinMax(tempVar)"
(keypress)="numericOnly($event)"
/>
TS File
numericOnly(e): boolean {
return e.keyCode === 8 && e.keyCode === 46
? true
: !isNaN(Number(e.key));
}
imposeMinMax(el) {
if (
el.value != '' &&
(parseInt(el.value) < parseInt(el.min) ||
parseInt(el.value) > parseInt(el.max))
) {
el.value = el.value.toString().slice(0, 2);
}
}
I can suggest an approach, that makes use of the keydown event:
<input type="number"
matInput
min="1"
max="99"
#tempVar
autocomplete="off"
formControlName="noOfWeeks"
(keydown)="handleKeydown($event)"
/>
handleKeyDown(e) {
const typedValue = e.keyCode;
if (typedValue < 48 && typedValue > 57) {
// If the value is not a number, we skip the min/max comparison
return;
}
const typedNumber = parseInt(e.key);
const min = parseInt(e.target.min);
const max = parseInt(e.target.max);
const currentVal = parseInt(e.target.value) || '';
const newVal = parseInt(typedNumber.toString() + currentVal.toString());
if (newVal < min || newVal > max) {
e.preventDefault();
e.stopPropagation();
}
}
Certainly, this handleKeyDown method can be further extended, depending on your requirement.
in a type="number" input, i would like to show 2 digits after dot like "2.50"
if a try
<input name="price" type="number" step="0.01" value="2.5">
this show me "2.5" and not "2.50"
Have you a method to do this ? HTML5 pure or with javascript ?
you need to use Jquery or JavaScript for that what ever you want but this solution in Jquery
You Can't go for more than 2 number
//Use keyup to capture user input & mouse up to catch when user is changing the value with the arrows
$('.trailing-decimal-input').on('keyup mouseup', function (e) {
// on keyup check for backspace & delete, to allow user to clear the input as required
var key = e.keyCode || e.charCode;
if (key == 8 || key == 46) {
return false;
};
// get the current input value
let correctValue = $(this).val().toString();
//if there is no decimal places add trailing zeros
if (correctValue.indexOf('.') === -1) {
correctValue += '.00';
}
else {
//if there is only one number after the decimal add a trailing zero
if (correctValue.toString().split(".")[1].length === 1) {
correctValue += '0'
}
//if there is more than 2 decimal places round backdown to 2
if (correctValue.toString().split(".")[1].length > 2) {
correctValue = parseFloat($(this).val()).toFixed(2).toString();
}
}
//update the value of the input with our conditions
$(this).val(correctValue);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input id="my-number-input" class="form-control trailing-decimal-input" type="number" min="0.01" step="0.01" value="2.50" />
you can preview or edit code Here on JSFiddle
You can solve by script Like :
<script type="text/javascript">
$(document).ready(function() {
var num = 2.5;
var n = num.toFixed(2);
alert(n);
});
</script>
<script type="text/javascript">
$(document).ready(function() {
var num = 2.500;
var n = num.toFixed(1);
alert(n);
});
</script>
How can I block input number of accepting trailing dashes (values like "10-" or "10-7")? If you enter wrong format Input doesn't give you any value.
<input name="Number" type="number">
You can use the pattern attribute:
<input name="Number" type="number" pattern="[0-9]*">
This is not possible without validating the value of the input.
Since it is a string representing the number there is no way to be sure that string may be representing numeric values or not.
The Permitted attributes will not give you the ability to validate the value of the number input control.
One way to do this with the help of JavaScript could look like this.
var numInput = document.querySelector('input');
// Listen for input event on numInput.
numInput.addEventListener('input', function(){
// Let's match only digits.
var num = this.value.match(/^\d+$/);
if (num === null) {
// If we have no match, value will be empty.
this.value = "";
}
}, false)
<input name="Number" type="number" min="0" >
function validate(evt) {
l = document.getElementsByTagName('input')[0].value.length;
if(l === 0 && String.fromCharCode(evt.keyCode) === '-') return
var theEvent = evt || window.event;
var key = theEvent.keyCode || theEvent.which;
key = String.fromCharCode( key );
var regex = /[0-9]|\./;
if( !regex.test(key) ) {
theEvent.returnValue = false;
if(theEvent.preventDefault) theEvent.preventDefault();
}
}
<input type='text' onkeypress='validate(event)' />
bind keydown event to the input, if keyCode == 189 or keyCode == 69, preventDefault()
I've got a HTML number input element: <input type="number">.
Problem is that I can also input following characters: + - e E , . which I don't want the user to be able to write.
How do I restrict these?
Edit: Boris K has got an even better answer.
Original answer:
This would be a way to accomplish that:
var ageInput = document.getElementById("age")
ageInput.addEventListener("keydown", function(e) {
// prevent: "e", "=", ",", "-", "."
if ([69, 187, 188, 189, 190].includes(e.keyCode)) {
e.preventDefault();
}
})
<input type="number" id="age">
You shouldn't rely only on <input type="number">, because that would work only in moderns browsers with different behaviours depending on the browser.
Use jQuery to perform additional checks (with a regexp):
$('#my-input').keypress(function() {
var inputValue = $(this).val();
var reg = /^\d+$/;
if (reg.test(inputValue)){
alert("input value is integer");
} else {
alert("input value is not an integer");
}
});
To restrict those values, catch the keypress event with javascript, and prevent those characters from being entered.
We capture the keyCode from the event, and restrict the input to not allow those characters by their ASCII codes.
document.getElementById('my-number-input').onkeypress = function(e) {
if(!e) e = window.event;
var keyCode = e.keyCode || e.which;
if(!((keyCode >= 48 && keyCode <= 57) ||
(keyCode >=96 && keyCode <= 105))) {
e.preventDefault(); //This stops the character being entered.
}
}
The IF statement above states that if the keycode is not in the range of 0-9 on the keyboard (including the number pad), then do not add the character to the input.
I have type=number input field and I have set min and max values for it:
<input type="number" min="0" max="23" value="14">
When I change the time in the rendered UI using the little arrows on the right-hand side of the input field, everything works properly - I cannot go either above 23 or below 0. However, when I enter the numbers manually (using the keyboard), then neither of the restrictions has effect.
Is there a way to prevent anybody from entering whatever number they want?
Maybe Instead of using the "number" type you could use the "range" type which would restrict the user from entering in numbers because it uses a slide bar and if you wanted to configure it to show the current number just use JavaScript
With HTML5 max and min, you can only restrict the values to enter numerals. But you need to use JavaScript or jQuery to do this kind of change. One idea I have is using data- attributes and save the old value:
$(function () {
$("input").keydown(function () {
// Save old value.
if (!$(this).val() || (parseInt($(this).val()) <= 11 && parseInt($(this).val()) >= 0))
$(this).data("old", $(this).val());
});
$("input").keyup(function () {
// Check correct, else revert back to old value.
if (!$(this).val() || (parseInt($(this).val()) <= 11 && parseInt($(this).val()) >= 0))
;
else
$(this).val($(this).data("old"));
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<input type="number" min="0" max="23" value="14" />
In some cases pattern can be used instead of min and max. It works correctly with required.
Despite the HTML5 enforcement of min and max on the up/down arrows of type=number control, to really make those values useful you still have to use Javascript.
Just save this function somewhere and call it on keyup for the input.
function enforceMinMax(el) {
if (el.value != "") {
if (parseInt(el.value) < parseInt(el.min)) {
el.value = el.min;
}
if (parseInt(el.value) > parseInt(el.max)) {
el.value = el.max;
}
}
}
<input type="number" min="0" max="23" value="14" onkeyup=enforceMinMax(this)>
<input type="number" min="0" onkeyup="if(value<0) value=0;" />
$(document).ready(function(){
$('input[type="number"]').on('keyup',function(){
v = parseInt($(this).val());
min = parseInt($(this).attr('min'));
max = parseInt($(this).attr('max'));
/*if (v < min){
$(this).val(min);
} else */if (v > max){
$(this).val(max);
}
})
})
Here is my contribution. Note that the v < min is commented out because I'm using Bootstrap which kindly points out to the user that the range is outside the 1-100 but wierdly doesn't highlight > max!
oninput="if(this.value>your_max_number)this.value=your_max_number;"
This works properly for me.
One event listener, No data- attribute.
You can simply prevent it by using following script:
$(document).on('keyup', 'input[name=quantity]', function() {
var _this = $(this);
var min = parseInt(_this.attr('min')) || 1; // if min attribute is not defined, 1 is default
var max = parseInt(_this.attr('max')) || 100; // if max attribute is not defined, 100 is default
var val = parseInt(_this.val()) || (min - 1); // if input char is not a number the value will be (min - 1) so first condition will be true
if (val < min)
_this.val(min);
if (val > max)
_this.val(max);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="number" class="form-control" name="quantity" max="250" min="1" value="">
The only problem is: You can't type - to get negative numbers if your min is lower than 0
This works for me I think you should try this you change the pattern according to your need
like you start from pattern 1
<input type="number" pattern="[0-9]{2}" min="0" max="23" value="14">
You can use html keyup event for restriction
<input type="number" min="0" max="23" value="14" onkeyup="if(value<0) value=0;if(value>23) value=23;">
Use this range method instead of number method.
$(function () {
$("#input").change(function () {
// Save old value.
$("#limit").val($("#input").val());
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<input type="text" id="limit" name="limit" value="14" readonly><br>
<input type="range" id="input" name="input" min="0" max="23" value="14"/>
Forget the keydown or keyup: it won't let you enter like 15 or 20 if the min was set to 10!
Use the change event since this is where the input value goes in your business logic (ViewModel):
private _enforceMinMax = (input:HTMLInputElement) => {
console.log("input", input);
const v = parseFloat(input.value);
if(input.hasAttribute("min")) {
const min = parseFloat(input.min);
if(v < min) {
input.value = min+"";
}
}
if(input.hasAttribute("max")) {
const max = parseFloat(input.max);
if(v > max) {
input.value = max+"";
}
}
}
private _distanceChange = (event) => {
this._enforceMinMax(event.target);
...
$(document).on('keyup', 'input[type=number][min],input[type=number][max]', function () {
var _this = $(this);
if (_this.val() === "-")
return;
var val = parseFloat(_this.val());
if (_this.attr("min") !== undefined && _this.attr("min") !== "") {
var min = parseFloat(_this.attr('min'));
if (val < min)
_this.val(min);
}
if (_this.attr("max") !== undefined && _this.attr("max") !== "") {
var max = parseFloat(_this.attr('max'));
if (val > max)
_this.val(max);
}
});
$(document).on('change', 'input[type=number][step]', function () {
var _this = $(this);
var val = parseFloat(_this.val());
if (_this.attr("step") !== undefined && _this.attr("step") !== "") {
var step = parseFloat(_this.attr('step'));
if ((val % step) != 0)
_this.val(val - (val % step));
}
});
This work perfect for geographic coordinates when you have general function document EventListener "keydown" in my example i use bootstrap class.
<input type="text" name="X_pos" id="X_pos" class="form-control form-control-line" onkeydown="event.stopPropagation(); return(parseInt(event.key) >= 0 && parseInt(event.key) <= 9 && this.value+''+event.key <= 179 && this.value+''+event.key >= (-179)) || this.value.slice(-1) == '.' && parseInt(event.key) >= 0 && parseInt(event.key) <= 9 || event.keyCode == 8 || event.keyCode == 190 && String(this.value+''+event.key).match(/\./g).length <=1 || event.keyCode == 109 && String(this.value+''+event.key).length == 1 || event.keyCode == 189 && String(this.value+''+event.key).length == 1" style="width:100%;" placeholder="X" autocomplete="off">
If you want you can create a function with this code but i preferred this method.
Again, no solution truly solved my question. But combined the knowledge, it somehow worked
What I wanted is a true max/min validator (supporting int/float) for my input control without fancy html5 help
Accepted answer of #Praveen Kumar Purushothaman worked but its hardcoded min/max in the checking condition
#Vincent can help me dynamically validate the input field by max/min attributes but it is not generic and only validating the integer input.
To combine both answer
Below code works for me
function enforceMinMax(el){
if(el.value != ""){
if(parseFloat(el.value) < parseFloat(el.min)){
el.value = el.min;
}
if(parseFloat(el.value) > parseFloat(el.max)){
el.value = el.max;
}
}
}
$(function () {
$("input").keydown(function () {
enforceMinMax(this);
});
$("input").keyup(function () {
enforceMinMax(this);
});
});
For the DOM
<input type="number" min="0" max="1" step=".001" class="form-control">
Afterwards all my inputs are truly responsive on the min max attributes.
Solution to respect min and max if they are defined on an input type=number:
$(document).on("change","input[type=number][min!=undefined]",function(){if($(this).val()<$(this).attr("min")) $(this).val($(this).attr("min"))})
$(document).on("change","input[type=number][max!=undefined]",function(){if($(this).val()>$(this).attr("max")) $(this).val($(this).attr("max"))})
Here is my Vanilla JS approach of testing against the set min and max values of a given input element if they are set.
All input.check elements are included in the input check. The actual input check is triggered by the change event and not by keyup or keydown. This will give the user the opportunity to edit their number in their own time without undue interference.
const inps=document.querySelectorAll("input.check");
inps.forEach(inp=>{
// memorize existing input value (do once at startup)
inp.dataset.old=inp.value;
// Carry out checks only after input field is changed (=looses focus)
inp.addEventListener("change",()=>{
let v=+inp.value;
// console.log(v,inp.min,inp.max,inp.dataset.old);
if(inp.max!=""&&v>+inp.max || inp.min!=""&&v<+inp.min) inp.value=inp.dataset.old;
else inp.dataset.old=inp.value;
});
})
<input class="check" type="number" min="0.1" max="23.4" value="14" />
$(function () {
$("input").keydown(function () {
// Save old value.
if (!$(this).val() || (parseInt($(this).val()) <= 11 && parseInt($(this).val()) >= 0))
$(this).data("old", $(this).val());
});
$("input").keyup(function () {
// Check correct, else revert back to old value.
if (!$(this).val() || (parseInt($(this).val()) <= 11 && parseInt($(this).val()) >= 0))
;
else
$(this).val($(this).data("old"));
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<input type="number" min="0" max="23" value="14" />
You can compare keyCode and return false if those keys aren't numbers
for e.g
<!DOCTYPE html>
<html>
<head>
<title>Parcel Sandbox</title>
<meta charset="UTF-8" />
<script>
function handleKeyDown(e) {
if (e.which != 8 && e.which != 0 && (e.which < 48 || e.which > 57)) {
e.preventDefault();
return false;
}
}
</script>
</head>
<body>
<input type="number" min="0" max="23" value="14" onkeydown="handleKeyDown(event)" />
</body>
</html>
if you still looking for the answer you can use input type="number".
min max work if it set in that order:
1-name
2-maxlength
3-size
4-min
5-max
just copy it
<input name="X" maxlength="3" size="2" min="1" max="100" type="number" />
when you enter the numbers/letters manually (using the keyboard), and submit a little message will appear in case of letters "please enter a number" in case of a number out of tha range "please select a value that is no more/less than .."