Case sensitive problem with upper letters by registration a new username

[hdietrich-timespin]

There is a Problem with register a new username with upper Letters. The registration templates allow an upper letter input.

If you register upper letters in later edit in the typo3-backend, the username will transform upper letters to lower during saving and editing the inputfield.

Reason:

the column username is marked in typo3 core for lowercase ('eval' => 'nospace,trim,lower,uniqueInPid,required').

in /typo3/sysext/frontend/Configuration/TCA/fe_users.php

      'username' => [
            'label' => 'LLL:EXT:frontend/Resources/Private/Language/locallang_tca.xlf:fe_users.username',
            'config' => [
                'type' => 'input',
                'size' => 20,
                'max' => 255,
                'eval' => 'nospace,trim,lower,uniqueInPid,required',
                'autocomplete' => false,
            ],
        ],

My Solution:

I register a JavaScript with the class “transform-value-to-lower-case”, which transform uppercase letters to lowercase letters:

<femanager:form.textfield
				id="femanager_field_username"
				property="username"
				class="form-control transform-value-to-lower-case"
				additionalAttributes="{femanager:Validation.FormValidationData(settings:settings,fieldName:'username')}" />

main.js

jQuery(document).ready(function () {
    Main.init();
});


let Main = {
    init : function() {
        jQuery(".transform-value-to-lower-case").on('change keyup paste',this.inputTransformToLowerCase);
    },
    inputTransformToLowerCase: function(e){

        //preserving the position of the cursor
        var start = e.target.selectionStart;

        //Converting text to lowercase
        $(this).val($(this).val().toLowerCase());

        //Jumping back to the old position of the cursor
        e.target.selectionStart = e.target.selectionEnd = start;
    }
}

A better solution will be, if the Extension additionally check the "lower" in the "eval"-Key in the TCA-Config!

Please add my or other solution in the extension!

Thanks