HTML 编号输入最小和最大不正常工作

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" />

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

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 .."

In some cases pattern can be used instead of min and max. It works correctly with required.

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

$(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!

$(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));
}
});

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"/>

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)>

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);
...

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.

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">

oninput="if(this.value>your_max_number)this.value=your_max_number;"

This works properly for me.

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" />

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>

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;">