JSFiddle - React, Tailwind, and code Playground

HTML

<script>
    function checkfhName(){
        //check your conditions
        checkConditions = false; //returned false
        if(checkConditions){
            //do stuff
            return true;
        }
        return false;
    }
</script>

<div id="navigation1">
    <ul>
        <li>
            <a href="#link_clicked" onClick='return checkfhName();'>Link</a>
        </li>
    </ul>
</div>