Add a new sibling item to Angular-UI-tree

Question

Add a new sibling item to Angular-UI-tree

I am trying to add a sibling item to a tree when clicked in angular-ui-tree (https://github.com/angular-ui-tree/angular-ui-tree)

Here is an example of what I currently have:

<item><input value"item A #1"><button>insert under</button></item>
<item><input value"item B #2"><button>insert under</button></item>
<item><input value"item C #3"><button>insert under</button></item>
<item><input value"item D #4"><button>insert under</button></item>

When clicking on "insert under" for Item C, I want to insert a new item between Item B and Item C, focusing the input of this new item.

Any ideas on how to achieve this functionality?

Thank you very much!

javascript angularjs tree angular-ui-tree

Answer 1

Answer №1

It would have been easier if you had provided a specific sample of your data and html, but I have given a generic solution that should still be helpful.

1) Creating an "add below" button

The ui-tree simply renders your tree model. In Angular, all you need to do is manipulate the data to add a node under another one. To achieve this, you need to access an array of sibling nodes and the current index. The index can be accessed using $index as ui-tree uses the standard ngRepeat. Getting the array of siblings is a bit trickier. By looking at the documentation, you can find that $parentNodesScope refers to the scope of the tree-nodes (siblings container), which contains $modelValue representing the siblings array. Here is how you can accomplish it:

<button ng-click='$parentNodesScope.$modelValue.splice($index+1,0,{value:"New",nodes:[]})'>Add below</button>

Replace {value:"New",nodes:[]} with the structure of the data you are working with.

2) Setting focus on the input of the added node

There are various ways to focus inputs in Angular, such as the method discussed in this Stack Overflow answer. Personally, I find this solution most effective. It focuses on elements as they are inserted into the DOM, including when ui-tree re-renders the tree with new nodes. One drawback is that after the initial page load, the focus will default to the last node added, which you can handle accordingly.

You can view a demo of the implementation here: Demo Link

Answer 2

It would have been easier if you had provided a specific sample of your data and html, but I have given a generic solution that should still be helpful.

1) Creating an "add below" button

The ui-tree simply renders your tree model. In Angular, all you need to do is manipulate the data to add a node under another one. To achieve this, you need to access an array of sibling nodes and the current index. The index can be accessed using $index as ui-tree uses the standard ngRepeat. Getting the array of siblings is a bit trickier. By looking at the documentation, you can find that $parentNodesScope refers to the scope of the tree-nodes (siblings container), which contains $modelValue representing the siblings array. Here is how you can accomplish it:

<button ng-click='$parentNodesScope.$modelValue.splice($index+1,0,{value:"New",nodes:[]})'>Add below</button>

Replace {value:"New",nodes:[]} with the structure of the data you are working with.

2) Setting focus on the input of the added node

There are various ways to focus inputs in Angular, such as the method discussed in this Stack Overflow answer. Personally, I find this solution most effective. It focuses on elements as they are inserted into the DOM, including when ui-tree re-renders the tree with new nodes. One drawback is that after the initial page load, the focus will default to the last node added, which you can handle accordingly.

You can view a demo of the implementation here: Demo Link

Answer 3

Answer №2

Give this a try. I've implemented onclick event listeners on the HTML buttons:

<item><input value="item A #1"><button onclick="onClickItem(this);">insert under</button></item>
<item><input value="item B #2"><button onclick="onClickItem(this);">insert under</button></item>
<item><input value="item C #3"><button onclick="onClickItem(this);">insert under</button></item>
<item><input value="item D #4"><button onclick="onClickItem(this);">insert under</button></item>

Next, take a look at the JavaScript code:

<script>
function onClickItem( clickedItem)
{
    var newElement = document.createElement( "item");
    newElement.innerHTML = '<input><button>insert under</button>';

    if( newElement.addEventListener)
        newElement.lastChild.addEventListener( "click", function() { onClickItem( newElement) });
    else if( newElement.attachEvent)
        newElement.lastChild.attachEvent( "onclick", function() { onClickItem( newElement) });  // for IE8 or earlier

    var parentNode = clickedItem.parentNode.parentNode;
    newElement = parentNode.insertBefore( newElement, clickedItem.parentNode.nextElementSibling );
}
</script>

The initial lines of the JavaScript create the new item based on the original items. It also adds an event listener to ensure the new item behaves similarly to the existing ones.

Finally, it uses the insertBefore method in the DOM to place the new item after the clicked element. This setup allows for cascading creation of additional items by clicking on each inserted button. Hopefully, this meets your requirements.

Answer 4

Give this a try. I've implemented onclick event listeners on the HTML buttons:

<item><input value="item A #1"><button onclick="onClickItem(this);">insert under</button></item>
<item><input value="item B #2"><button onclick="onClickItem(this);">insert under</button></item>
<item><input value="item C #3"><button onclick="onClickItem(this);">insert under</button></item>
<item><input value="item D #4"><button onclick="onClickItem(this);">insert under</button></item>

Next, take a look at the JavaScript code:

<script>
function onClickItem( clickedItem)
{
    var newElement = document.createElement( "item");
    newElement.innerHTML = '<input><button>insert under</button>';

    if( newElement.addEventListener)
        newElement.lastChild.addEventListener( "click", function() { onClickItem( newElement) });
    else if( newElement.attachEvent)
        newElement.lastChild.attachEvent( "onclick", function() { onClickItem( newElement) });  // for IE8 or earlier

    var parentNode = clickedItem.parentNode.parentNode;
    newElement = parentNode.insertBefore( newElement, clickedItem.parentNode.nextElementSibling );
}
</script>

The initial lines of the JavaScript create the new item based on the original items. It also adds an event listener to ensure the new item behaves similarly to the existing ones.

Finally, it uses the insertBefore method in the DOM to place the new item after the clicked element. This setup allows for cascading creation of additional items by clicking on each inserted button. Hopefully, this meets your requirements.

Add a new sibling item to Angular-UI-tree

Answer №1

Answer №2

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