MediaWiki:Gadget-sigreminder-core.js

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// <nowiki>
$('#wpSave').click(function (e) {
    var text = $('#wpTextbox1').val(),
    	reminder = 'It looks like you forgot to sign your comment. You can sign by placing 4 tildes (~~\~~) to the end of your message.\nAre you sure you want to post it?';

    if (
        // don't trigger on minor edits
        $('#wpMinoredit').prop('checked') ||

        // check for signature
        text.replace(/(<nowiki>.*?<\/nowiki>)/g, '').match('~~\~') ||

        // check for &undo= or ?undo= in URL as summary can be altered
        mw.util.getParamValue('undo') ||

        // check for user welcome notice in edit summary
        // since those often don't need signatures
        $('#wpSummary').val().match(/welcome/i)
    ) {
        return;
    }

    if (!confirm(reminder)) {
        e.preventDefault();
    }
});