html5 input for money/currency

问题:

I seem unable to work out what to use for accepting monetary values on a form.

I have tried...

<input type="number" min="0" max="10000" step="1" name="Broker_Fees" id="broker_fees" required="required">

But that then won't allow for pence entries.

I want the incremental button control to go up in pounds, but still want the ability to enter pence.

Who would want to use an incremental button that moved 1p at a time?

Perhaps I'm using the wrong control , but I can't find a money/currency control?

Can someone please advise the best way to accept monetary values (including commas, decimal places and currency symbol) using HTML5?

Thanks, 1DMF

回答1:

Enabling Fractions/Cents/Decimals for Number Input

In order to allow fractions (cents) on an HTML5 number input, you need to specify the "step" attribute to = "any":

<input type="number" min="1" step="any" />

This will specifically keep Chrome from displaying an error when a decimal/fractional currency is entered into the input. Mozilla, IE, etc... don't error out if you forget to specify step="any". W3C spec states that step="any" should, indeed, be needed to allow for decimals. So, you should definitely use it.

Also, the number input is now pretty widely supported (>90% of users).

---

What Input Options are there for Money/Currency

The title of the question has since changed and takes on a slightly different meaning. One could use both number or text input in order to accept money/decimals.

For an input field for currency/money, it is recommended to use input type of number and specify appropriate attributes as outlined above. As of 2019, there is not a W3C spec for an actual input type of currency or money.

Main reason being it automatically coerces the users into entering a valid standard currency format and disallows any alphanumeric text. With that said, you could certainly use the regular text input and do some post processing to only grab the numeric/decimal value (there should be server side validation on this at some point as well). If you want fancier logic/formatting, you'll likely need to create custom JS logic for a text input.

回答2:

Try using step="0.01", then it will step by a penny each time.

eg:

<input type="number" min="0.00" max="10000.00" step="0.01" />

回答3:

Using javascript's Number.prototype.toLocaleString:

var currencyInput = document.querySelector('input[type="currency"]');
var currency = 'GBP'; // https://www.currency-iso.org/dam/downloads/lists/list_one.xml

currencyInput.addEventListener('focus', onFocus);
currencyInput.addEventListener('blur', onBlur);

function localStringToNumber( s ){
    return Number(String(s).replace(/[^0-9.-]+/g,""));
}

function onFocus(e){
  var value = e.target.value;
  e.target.value = value ? localStringToNumber(value) : '';
}

function onBlur(e){
  var value = e.target.value;

  const options = {
      maximumFractionDigits : 2,
      currency              : currency,
      style                 : "currency",
      currencyDisplay       : "symbol"
  }
  
  e.target.value = value 
    ? localStringToNumber(value).toLocaleString(undefined, options)
    : ''
}

input{
  padding: 10px;
  font: 20px Arial;
}

<input style='width:70%' type='currency' placeholder='Type a number & click outside' />

回答4:

Well in the end I had to compromise by implementing a HTML5/CSS solution, forgoing increment buttons in IE (they're a bit broke in FF anyway!), but gaining number validation that the JQuery spinner doesn't provide. Though I have had to go with a step of whole numbers.

span.gbp {
    float: left;
    text-align: left;
}

span.gbp::before {
    float: left;
    content: "\00a3"; /* £ */
    padding: 3px 4px 3px 3px;
}

span.gbp input {
     width: 280px !important;
}

<label for="broker_fees">Broker Fees</label>
<span class="gbp">
    <input type="number" placeholder="Enter whole GBP (&pound;) or zero for none" min="0" max="10000" step="1" value="" name="Broker_Fees" id="broker_fees" required="required" />
</span>

The validation is a bit flaky across browsers, where IE/FF allow commas and decimal places (as long as it's .00), where as Chrome/Opera don't and want just numbers.

I guess it's a shame that the JQuery spinner won't work with a number type input, but the docs explicitly state not to do that :-( and I'm puzzled as to why a number spinner widget allows input of any ascii char?

回答5:

We had the same problem for accepting monetary values for Euro, since <input type="number" /> can't display Euro decimal and comma format.

We came up with a solution, to use <input type="number" /> for user input. After user types in the value, we format it and display as a Euro format by just switching to <input type="text" />. This is a Javascript solution though, cuz you need a condition to decide between "user is typing" and "display to user" modes.

Here the link with Visuals to our solution: Input field type "Currency" problem solved

Hope this helps in some way!