TODO for How to set custom validation message
Sample code from .phtml form
How to set custom validation message :
Today we look into one of the smallest part part but very much needed when we have to make user friendly.
We can get this done with a simple data attribute named “data-msg-
<input type="text" name="telephone" id="telephone" value="<?= @$block->escapeHtmlAttr($block->getTelephone()) ?>" title="<?= $block->escapeHtmlAttr(__('Phone Number')) ?>" class="input-text validate-digits validate-digits-range digits-range-10000000000-99999999999 <?= $_validationClass ?: '' ?>" data-msg-validate-digits-range="The value is not within the specified range. Entry should be of 11 digits" />
Now its look simple but still need to pay little attention over the class name.
Take a few examples from me like for “required" we will use something like data-msg-required-entry="Custom message" ok let have one more example for “validate-digits" we can add it like this data-msg-validate-digits="Digit only"
There is no limitation in using data-msg. you can use multiple in same input as per validation class.
For more : https://magento.stackexchange.com/questions/163585/magento-2-how-to-set-custom-validation-message
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