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<script>
function blockToggle(type,blockee,elem){
	var conf = confirm("Press OK to confirm the '"+type+"' action on user <?php echo $u; ?>.");
	if(conf != true){
		return false;
	}
	var elem = document.getElementById(elem);
	elem.innerHTML = 'please wait ...';
	var ajax = ajaxObj("POST", "includes/block_system.php");
	ajax.onreadystatechange = function() {
	if(ajaxReturn(ajax) == true) {
		if(ajax.responseText == "blocked_ok"){
		elem.innerHTML = '<button id="update_button" class="btn btn-primary" style="width:49%"  onclick="blockToggle(\'unblock\',\'<?php echo $u; ?>\',\'blockBtn\')">Unblock User</button>';
		} else if(ajax.responseText == "unblocked_ok"){
			elem.innerHTML = '<button id="update_button" class="btn btn-primary" style="width:49%"  onclick="blockToggle(\'block\',\'<?php echo $u; ?>\',\'blockBtn\')">Block User</button>';
		} else {
			alert(ajax.responseText);
			elem.innerHTML = 'Try again later';
			}
		}
	}
	ajax.send("type="+type+"&blockee="+blockee);
}
</script>

Cod: Selectaţi tot

Uncaught TypeError: Cannot set property 'innerHTML' of null

Cod: Selectaţi tot

elem.innerHTML = 'please wait ...';

Cod: Selectaţi tot

<button id="update_button" class="btn btn-primary" style="width:49%" onclick="blockToggle(\'unblock\',\''.$u.'\',\'blockBtn\')">Deblocheaza</button>

Cod: Selectaţi tot

if(elem) elem.innerHTML = '...';