javascript - How do I show an element when another element has already been clicked? -

i have link,

<a href="manager_view.html">     <p class="in_row">jane doe</p> </a> 

i want show checkmark, ✓, when jane doe has been clicked in past. how that?

fiddle

javascript

document.getelementsbyclassname('in_row')[0].onclick = function() {     this.classname = 'in_row clicked'; } 

or, if have more one:

var rows = document.getelementsbyclassname('in_row'); (var = 0, len = rows.length; < len; i++) {     rows[i].onclick = doclick; //this function above code } 

css

.clicked:before {     content:"✓"; }