Best settings for HTML , for mobile devices

问题

I've been reading many other questions, like these[1][2][3] for example, but the problem still persists.

I need to find the "cleanest" way to have a HTML input for mobile devices and which respects all these three rules:

suitable mainly for numbers, integer or float
shows the numeric keypad on mobile devices, on Chrome for Android and Safari for iOS, with no strange extra keys
fully respects the HTML5 rules (tested by W3 validator)

What have I tried?

I've been across these solutions, which neither of theme cumulatively respects those three above rules.

Solution 1

<input type="text" pattern="\d*" />

This solution despite working in iOS and fulfilling HTML rules tested by w3 validator, presents in Chrome Android the full keypad with the QWERTY keyboard.

Solution 2

<input type="number" pattern="\d*" />

This solution works on both systems iOS and Android Chrome, showing the numbers keypad on both systems, but it throws out a HTML validation error

Attribute pattern is only allowed when the input type is email, password, search, tel, text, or url.

Solution 3

<input type="number" />

This solution passes the HTML test, shows nice on Chrome, but on iOS keypad it presents several unwanted keys

Solution 4

I see that many developers use this solution

<input type="tel" />

But as tested with Android Chrome, it doesn't allow dot symbols (.), and the keys have letters, which is superfluous.

回答1:

For your specific task I have the extraordinary solution: we take the best solution with type="text" and pattern and then add the JavaScript which corrects the type attribute. We do it to pass through W3 validator.

The solution

// iOS detection from: stackoverflow.com/a/9039885 with explanation about MSStream
if(/iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream)
{
    var inputs = document.querySelectorAll('input[type="number"]');
    for(var i = inputs.length; i--;)
        inputs[i].setAttribute('pattern', '\\d*');
}

<input type="number" />

My solution respects all your three rules (W3 validator inclusive).

But I have to mention that in this case(with pattern) on iOS we do not have the possibility to put float numbers with numeric keypad because on iOS we do not have any keypad with numbers including points. On Android we have this possibility. If you want to have numeric keypad with float numbers then you have to write for iOS extra solution like follows:

 <input type="number" />

回答2:

As mentioned in the comments, because there is no straight forward way to accomplish this, the best work around is to always use an input type="number" with an if statement that if the device is an iOS device then the code will add the proper pattern attribute to the type.

回答3:

Following @Alex Charters suggestion, I propose this solution, using jQuery, which seems to be the quicker, and the more elegant.

Add this piece of code to the "onload" of the page

//shows numeric keypad on iOS mobile devices
if(getMobileOperatingSystem() === "iOS"){
    $('input[type="number"]').attr("pattern", "\\d*");
}

The operating system detecting function is this, taken from other SO answer:

/**
 * Determine the mobile operating system.
 * This function returns one of 'iOS', 'Android', 'Windows Phone', or 'unknown'.
 *
 * @returns {String}
 */
function getMobileOperatingSystem() {
  var userAgent = navigator.userAgent || navigator.vendor || window.opera;

      // Windows Phone must come first because its UA also contains "Android"
    if (/windows phone/i.test(userAgent)) {
        return "Windows Phone";
    }

    if (/android/i.test(userAgent)) {
        return "Android";
    }

    // iOS detection from: http://stackoverflow.com/a/9039885/177710
    if (/iPad|iPhone|iPod/.test(userAgent) && !window.MSStream) {
        return "iOS";
    }

    return "unknown";
}

I tested and it fulfils the three rules. When the operating system is iOS it adds the pattern attribute. I don't do it by default, because I realised that said piece of code takes some time to process according to the number of inputs, and thus it just runs when it assumes an iOS operating system.

来源：https://stackoverflow.com/questions/51660812/best-settings-for-html-input-type-number-for-mobile-devices

标签

mobile-safari