Extjs: How to Select a Node After Creating a Tree Structure

Question

Extjs: How to Select a Node After Creating a Tree Structure

I am facing an issue with my TreePanel where I want to preselect a specific node when loading it. The nodes are fetched from a remote json file and the tree structure loads correctly. However, the selected node is not getting highlighted and Firebug is showing the node as undefined. I suspect this could be due to the async property but I am unable to find a workaround or specify the node to be selected programmatically.

If you have any suggestions or solutions for this problem, please feel free to share them. Thank you in advance.

    LeftMenuTree = new Ext.tree.TreePanel({
    renderTo: 'TreeMenu',
    collapsible: false,
    height: 450,
    border: false,
    userArrows: true,
    animate: true,
    autoScroll: true,
    id: 'testtest',
    dataUrl: fileName,
    root: {
  nodeType: 'async',    
     iconCls:'home-icon',
     expanded:true,
       text: rootText
    },
    listeners: {
        "click": {
    fn: onPoseClick,
                 scope: this
               }
        },
          "afterrender": {
       fn: setNode,
       scope: this 
      }  
 });
function setNode(){
 alert (SelectedNode);
  if (SelectedNode == "Orders"){
    var treepanel = Ext.getCmp('testtest');
    var node = treepanel.getNodeById("PendingItems");
    node.select();
  }
}

javascript ajax extjs

Answer 1

Answer №1

This snippet of code is utilized in the TreeGrid to highlight a specific node

_I.treeGrid.getSelectionModel().select(_I.treeGrid.getRootNode());

While I have not personally tested this in a TreePanel, as the TreeGrid is built on it, I would assume it functions properly. I employed a similar approach by using the load event of the loader to execute comparable code after the XHR request was finished. Therefore, when creating your setNode function, consider structuring it like this:

var loader = LeftMenuTree.getLoader();
loader.on("load", setNode);    
function setNode(){
     alert (SelectedNode);
      if (SelectedNode == "Orders"){
        var treepanel = Ext.getCmp('testtest');
        treepanel.getSelectionModel().select(treepanel.getNodeById("PendingItems"));
      }
    }

Answer 2

This snippet of code is utilized in the TreeGrid to highlight a specific node

_I.treeGrid.getSelectionModel().select(_I.treeGrid.getRootNode());

While I have not personally tested this in a TreePanel, as the TreeGrid is built on it, I would assume it functions properly. I employed a similar approach by using the load event of the loader to execute comparable code after the XHR request was finished. Therefore, when creating your setNode function, consider structuring it like this:

var loader = LeftMenuTree.getLoader();
loader.on("load", setNode);    
function setNode(){
     alert (SelectedNode);
      if (SelectedNode == "Orders"){
        var treepanel = Ext.getCmp('testtest');
        treepanel.getSelectionModel().select(treepanel.getNodeById("PendingItems"));
      }
    }

Answer 3

Answer №2

It worked perfectly for me...

var search  = Ext.getCmp('searchBox').getLoader();
search.on("load", function(x,y,z){ 
   y.findChild("id",1, true).select(); // can locate by any attribute in the dataset
});

Answer 4

It worked perfectly for me...

var search  = Ext.getCmp('searchBox').getLoader();
search.on("load", function(x,y,z){ 
   y.findChild("id",1, true).select(); // can locate by any attribute in the dataset
});

Answer 5

Answer №3

If you're looking for a solution similar to this, I have detailed the steps in achieving it right here:

http://www.example.com/achieve-something-similar-with-extjs

Ensure that the node you are selecting is visible by traversing the tree and expanding all its parent nodes starting from the root down.

Answer 6

If you're looking for a solution similar to this, I have detailed the steps in achieving it right here:

http://www.example.com/achieve-something-similar-with-extjs

Ensure that the node you are selecting is visible by traversing the tree and expanding all its parent nodes starting from the root down.

Answer 7

Answer №4

The reason behind this issue is that the node cannot be selected until the tree is fully rendered. To solve this problem, consider attaching your node selection logic to an event listener that triggers upon the completion of rendering.

Answer 8

The reason behind this issue is that the node cannot be selected until the tree is fully rendered. To solve this problem, consider attaching your node selection logic to an event listener that triggers upon the completion of rendering.

Answer 9

Answer №5

If you are utilizing a sufficiently recent version of ExtJS, I personally find that utilizing ViewModels and the Selection configuration makes tasks like this much simpler.

For example:

LeftMenuTree = new Ext.tree.TreePanel({
renderTo: 'TreeMenu',
collapsible: false,
height: 450,
border: false,
userArrows: true,
animate: true,
autoScroll: true,
id: 'testtest',
dataUrl: fileName,
bind: {
    Selection: '{SelectedNode}'
}, 
root: {
   nodeType: 'async',    
   iconCls:'home-icon',
   expanded:true,
   text: rootText
},
listeners: {
    "click": {
       fn: onPoseClick,
       scope: this
    }
    "afterrender": {
       fn: setNode,
       scope: this 
    }  
 });

(Make sure to have either a ViewModel established in the TreePanel or the containing view)

Assuming you are using a ViewController and setNode is a method:

setNode: function(){
 var nodeToSelect = // code to locate the node object here
 this.getViewModel().set('Selection', nodeToSelect);
}

The benefit of the ViewModel approach is that it appears to seamlessly handle all rendering and data loading matters automatically.

Answer 10

If you are utilizing a sufficiently recent version of ExtJS, I personally find that utilizing ViewModels and the Selection configuration makes tasks like this much simpler.

For example:

LeftMenuTree = new Ext.tree.TreePanel({
renderTo: 'TreeMenu',
collapsible: false,
height: 450,
border: false,
userArrows: true,
animate: true,
autoScroll: true,
id: 'testtest',
dataUrl: fileName,
bind: {
    Selection: '{SelectedNode}'
}, 
root: {
   nodeType: 'async',    
   iconCls:'home-icon',
   expanded:true,
   text: rootText
},
listeners: {
    "click": {
       fn: onPoseClick,
       scope: this
    }
    "afterrender": {
       fn: setNode,
       scope: this 
    }  
 });

(Make sure to have either a ViewModel established in the TreePanel or the containing view)

Assuming you are using a ViewController and setNode is a method:

setNode: function(){
 var nodeToSelect = // code to locate the node object here
 this.getViewModel().set('Selection', nodeToSelect);
}

The benefit of the ViewModel approach is that it appears to seamlessly handle all rendering and data loading matters automatically.

Extjs: How to Select a Node After Creating a Tree Structure

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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