What is the proper method for incorporating permitted symbols into an HTML input form?

I am currently working on creating my own input tag with a field specifically for phone numbers:

    <base-input
        style="margin-bottom: 15px; width: 100%; max-width: 510px;"
        v-model="phone"
        type="tel"
        placeholder="Mobile phone"
    />

I am looking to restrict the allowed symbols to only digits (0-9) and the plus symbol (+). I have attempted using pattern="[0-9]+", but this approach did not yield the desired results. I also understand that regular expressions can accomplish this, but I need guidance on how to implement them in this scenario.

javascripthtmlcssvue.jsinput

Answer №1

Employ the regular expression pattern ^[0-9+]+$. This regex allows for numbers and the plus sign symbol.

Check out an example here

Answer №2

The input element in HTML includes a pattern attribute that allows for the use of Regular Expressions.

In your specific scenario, you can implement it like this:

<input
style="margin-bottom: 15px; width: 100%; max-width: 510px;"
v-model="phone"
type="tel"
placeholder="Mobile phone" 
pattern="[0-9\+]+" title="Phone number - only allowed symbols are (0-9 and +)" />

If the entered value does not match the specified pattern, the title message will be displayed.

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