How to set H5 form verification failure prompt-H5 Tutorial-php.cn

How to set H5 form verification failure prompt

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Release： 2018-03-26 17:05:31

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This time I will bring you how to set up H5's form verification failure prompts, set H5 form verification failure prompts What are the precautions , the following is a practical case, one Get up and take a look.

Preface

When front-end children’s shoes are writing pages, they will inevitably step into the pit of form validation. At this time, we I'm about to kneel down because I have to write a bunch of js to check. But since the emergence of H5, many common expression verifications have been implemented for us, which has relieved us a lot of burden, just like the following:

Email address verification:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Test</title>
</head>
<body>
    <form action="">
        <label >
            邮箱: <input type="email">
        </label>
        <input type="submit">
    </form>
</body>
</html>

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Email verification is supported by H5 itself, but there are many scenarios and situations we need to verify. Various, what should we do? Should we use JS again? Obviously it’s not that painful, because H5 provides the pattern attribute, allowing us to do our own thing! We can specify regular expression in pattern, as long as it is written in regular form OK, don’t worry about verification!

Regular limit is 11 digits:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Test</title>
</head>
<body>
    <form action="">
        <label >
            数字: <input type="text" pattern="^\d{11}$">
        </label>
        <input type="submit">
    </form>
</body>
</html>

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Question

You can try it. When you enter a number other than 11 digits, an error will be reported. This is the contribution of pattern. But I don’t know if you have discovered a painful phenomenon. ? That is, if we use the pattern method to verify the form, when the verification fails, its prompts are please be consistent with the requested format. My God, how do our users know what the requested format is? There is no way. Let them look at the source code. If this is the case, we don’t even need to write the page. We can just ask them to give us the money. Just kidding~

Solution

If there is a problem, we have to solve it. After programming for Google for a long time, we finally found a good solution:

oninvalid: When the value of the submitted input element is an invalid value (here is Regular verification failed), triggering the

oninvalid event. oninvalid belongs to the Form event.

setCustomValidity(): This is the built-in JS method of HTML5, used to customize prompt information

It turns out that you can customize prompts through oninvalid and setCustomValidity, then this is easy to do, modify the source code as follows :

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Test</title>
</head>
<body>
    <form action="">
        <label >
            数字: <input type="text" pattern="^\d{11}$" oninvalid="setCustomValidity(&#39;请输入11位数字&#39;)">
        </label>
        <input type="submit">
    </form>
</body>
</html>

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Result:

#Finally it’s not that annoying “format” anymore. Now the form validation prompt has clearly told us that we should enter What kind of data is it, so that users can better modify their input!

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website!