I was looking at the following example of treeview using Angular 1.5: link
In the css section it specifies a fixed height for .grid as follows:
.grid {
width: 500px;
height: 500px;
}
Is there a way of dynamically adjusting this height according to how a tree node is clicked to expand?
The relevant documentation for treeview is here. However, the example shown there also has a fixed height, which I would like to change to dynamic height.
I managed to find a solution by implementing methods that dynamically change the container height. In the controller, I first initalize variables that will be used later in JS and the template using ng-style:
//===================================================
// Initalize height that will be altered later based
// on tree expand/collapse events
//===================================================
var row_height = 30; // use this to set height everywhere
$scope.height = row_height;
$scope.height_px = row_height + 'px'; // used in template with ng-style
Then while initialize the tree view grid options, one can reference row_height. We also add the logic to add or deduct height based on rowExpanded and rowCollapsed events in the options:
$scope.gridOptions = {
rowHeight: row_height,
enableSorting: true,
enableFiltering: false,
//.....continue other options.....
onRegisterApi: function(gridApi) {
$scope.gridApi = gridApi;
// Add container height for row expanded
$scope.gridApi.treeBase.on.rowExpanded(null, function(row) {
addHeight(row.treeNode.children.length);
});
// Deduct container height for row collapsed after considering
// all child node expanded state
$scope.gridApi.treeBase.on.rowCollapsed(null, function(row) {
// get number of children that are already expanded
var count = row.treeNode.children.length;
for(var i=0; i < row.treeNode.children.length; i++) {
count += getChildCount( row.treeNode.children[i]);
}
deductHeight(count);
});
}
}
We then add the methods to controller that are needed for addHeight(), deductHeight() and getChildCount() to work:
// Method to add height of container dynamically based on number of rows
var addHeight = function (num_rows) {
$scope.height += num_rows * row_height;
$scope.height_px = $scope.height + 'px';
};
// Method to deduct height of container dynamically based on number of rows
var deductHeight = function (num_rows) {
$scope.height -= num_rows * row_height;
if($scope.height <= 0) {
$scope.height = row_height;
}
$scope.height_px = $scope.height + 'px';
};
// Method to get count of expanded child rows for a given node (used recursively)
var getChildCount = function (node) {
var count = 0;
if(node.state == 'expanded') {
// change the state to collapsed for all child nodes
node.state = 'collapsed';
count += node.children.length;
for(var i=0; i < node.children.length; i++) {
count += getChildCount(node.children[i]);
}
return count;
} else {
return 0;
}
};
Notice that we recursively get node count when we collapse a node. We also change the state of sub-nodes to collapsed so that the height is calculated correctly the next time.
Finally in the template, we need to reference the $scope.height_px which gives the dynamic height for the container. We do this by setting ng-style="{ 'height': height_px }" as follows:
<div id="gridTree-1" ui-grid="gridOptions" class="grid" ui-grid-tree-view ui-grid-auto-resize ng-style="{ 'height': height_px }"></div>
One problem that I encountered after this was that the mouse scroll stopped working when it was placed on top of the grid. This problem apparently has a solution as suggested here. However, the actual problem relates to disablement of scroll functionality in ui-grid.js. In version 3.1.1 line 2721 reads event.preventDefault();. I had to comment this line out for the scroll to work normally again.
To set Manual Height for UI-Grid Tree View when user Expand or Collapse the parent row
checkout onRegisterApi:
var rowtpl = '<div ng-repeat="(colRenderIndex, col) in colContainer.renderedColumns track by col.colDef.name" class="ui-grid-cell" ng-class="{ \'disabled\': true, \'ui-grid-row-header-cell\': col.isRowHeader }" ui-grid-cell></div>';
$scope.gridOptions = {
enableColumnResizing: true,
enableSorting: false,
enableColumnMenus: false,
showTreeExpandNoChildren: false,
enableExpandAll:false,
enableTreeView: true,
rowTemplate: rowtpl,
enableFiltering: true,
enableRowSelection: true,
enableRowHeaderSelection: false,
enableHorizontalScrollbar: 0,
multiSelect: false,
modifierKeysToMultiSelect: false,
noUnselect: true,
onRegisterApi: function (gridApi) {
$scope.gridApi = gridApi;
//Row Collapse Set Height
$scope.gridApi.treeBase.on.rowCollapsed($scope, function (row) {
gridHeight();
});
//Row Expand Set Height
$scope.gridApi.treeBase.on.rowExpanded($scope, function (row) {
gridHeight();
});}}
Now look at function gridHeight() where you can easily set value for height
function gridHeight() {
//timeout function is used due to late updation of $scope.gridApi.core.getVisibleRows()
$timeout(function () {
// 40: header height
// 30: height for each row
const visibleRowHeight = 40 + (30 * $scope.gridApi.core.getVisibleRows().length);
if (visibleRowHeight > 280) {
vm.totalHeight = 280;
}
else {
vm.totalHeight = visibleRowHeight;
}
//Adjust your height max and min accordingly like i did
}, 200);
}
View:
<div id="grid" ui-grid="gridOptions" class="grid" ui-grid-tree-view ui-grid-tree-row-header-buttons ui-grid-cellNav ui-grid-auto-resize ui-grid-resize-columns ui-grid-selection ng-style="{height: vm.totalHeight+'px'}"></div>
