I have to create a validation for the telephone inputs in Magento Admin. I need to set a min of characters like 8 and a max of 15. I'm currently using 2.2.8 version.

I tried to set the validation by admin using telephone attribute, but it didn't work. It inserts a class for validation but doesn't validate at all.


  • do you want this validation in system.xml file or in custom form? – Mohit Rane Aug 2 '19 at 4:46
  • Hi @MohitRane, I want it for the new customer form and billing and shipping form inside the admin, but I don't even know where to look. =( – Mariana Martins Menezes Aug 12 '19 at 3:24
  • do you want this change in custom module functionality or you to want to change in Magento's default functionality? – Mohit Rane Aug 12 '19 at 4:30
  • Hey @MohitRane, I want to change in Magento's default functionality. – Mariana Martins Menezes Aug 12 '19 at 22:29
  • can you share the screenshot of where you want this validation to make sure we're talking about the same thing? – Mohit Rane Aug 13 '19 at 5:02

Put the following code inside the telephone number block in your layout file

 <item name="validation" xsi:type="array">
    <item name="min_text_length" xsi:type="number">8</item>
    <item name="max_text_length" xsi:type="number">15</item>
    <item name="validate-number" xsi:type="number">0</item>
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