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How to enable/disable toolbar item/items

The toolbar items can be enabled/disabled by specifying the items in enableToolbarItems or disableToolbarItems methods respectively.

The following example shows enabling and disabling toolbar items on button click.

The new toolbar button is added using toolbarSettings. The toolbarClick event is used to add an event handler to the new toolbar button.

Source
Preview
index.js
index.html
var hostUrl = 'https://ej2-aspcore-service.azurewebsites.net/';
// inject feature modules of the file manager
ej.filemanager.FileManager.Inject(ej.filemanager.DetailsView,ej.filemanager.Toolbar,ej.filemanager.NavigationPane);
// initialize File Manager component
var filemanagerInstance = new ej.filemanager.FileManager({
    ajaxSettings: {
        url: hostUrl + 'api/FileManager/FileOperations',
        getImageUrl: hostUrl + 'api/FileManager/GetImage',
        uploadUrl: hostUrl + 'api/FileManager/Upload',
        downloadUrl: hostUrl + 'api/FileManager/Download'
    },
    height: "330px"
});

// render initialized File Manager
filemanagerInstance.appendTo('#filemanager');

// Click event for enable button
document.getElementById("enable").onclick = function(args) {
    // Enable new folder toolbar item
    filemanagerInstance.enableToolbarItems(["newfolder"]);
}

// Click event for disable button
document.getElementById("disable").onclick = function(args) {
    // Disable new folder toolbar item
    filemanagerInstance.disableToolbarItems(["newfolder"]);
}
<!DOCTYPE html><html lang="en"><head>
    <title>Essential JS 2 File Manager</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Essential JS 2 File Manager Component">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-splitbuttons/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-layouts/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-grids/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-filemanager/styles/material.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
</head>
<body>
    
    <div id="filemanager"></div>
    <button id="enable" class="e-btn e-success">Enable New Folder toolbar item</button>
    <button id="disable" class="e-btn e-danger">Disable New Folder toolbar item</button>

<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>