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Version: v11.7.1

Tree Use Case - Dynamic Tree


Using the Tree widget, you can build a folder-file structure, and user can decide how many folder and files to include in a tree.

  1. Drag and drop a Tree widget, and add two buttons including Add File and Add Folder.

  1. Select the Tree widget. Go to Value property and click the bind icon under the Dataset section. Go to the Use Expression tab and set the script variable as treeData.

  1. From the Script tab, use the following script for treeData:
// should be an array of objects consisting of label, icon, children keys
// populate the initial data
Page.treeData = [{
"label": "folder1",
"icon": "fa fa-folder",
"children": []
}, {
"label": "folder2",
"icon": "fa fa-folder",
"children": []
}];
  1. Select JavaScript for the onSelect event of the tree widget as following:
Page.activeTreeElement = $item;
  1. For the buttons Add File and Add Folder, select JavaScript for the onClick events, and add the following code:
Page.addfileClick = function ($event, widget) {
// add file
if (Page.activeTreeElement) {
if (_.isArray(Page.activeTreeElement.children)) {
Page.activeTreeElement.children.push({
"label": "new file",
"icon": "fa fa-file"
});

}
}
//tree1 is the tree widget name
Page.Widgets.tree1.redraw();
};

Page.addfolderClick = function ($event, widget) {
// add folder
if (Page.activeTreeElement) {
if (_.isArray(Page.activeTreeElement.children)) {
Page.activeTreeElement.children.push({
"label": "new folder",
"icon": "fa fa-folder",
"children": []
});

}
}
//tree1 is the tree widget name
Page.Widgets.tree1.redraw();
};
  1. Preview the page and see two folders available by default. Select one node and click Add File to add files, or Add Folder to a add folder.

See Also

Tree Widget Cases
How to build a tree from static variable
How to build tree from java service