ng2-dropdown-treeview
v2.0.1
Published
An Angular 2 tree component with checkbox and multiple level
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ng2-dropdown-treeview
An Angular 2 tree component with checkbox and multiple level.
This component is discontinued anymore. It's compatible with both Angular 2 & 4.
But if you are using Angular 4, should switch to my new component ngx-treeview
Dependencies
You can customize CSS yourself to break down dependencies to Bootstrap & Font Awesome.
Features
- Unlimited tree levels
- Item state: checked, disabled
- Collapse / Expand
- Text filtering
- Internationalization (i18n) support
- Template
Demo
https://embed.plnkr.co/1kcbUvNze8HAJ0tN0wsX/
Installation
After install the above dependencies, install ng2-dropdown-treeview
via:
npm install --save ng2-dropdown-treeview
Once installed you need to import our main module in your application module:
import {DropdownTreeviewModule} from 'ng2-dropdown-treeview';
@NgModule({
declarations: [AppComponent, ...],
imports: [DropdownTreeviewModule.forRoot(), ...],
bootstrap: [AppComponent]
})
export class AppModule {
}
Usage
Treeview dropdown:
<leo-dropdown-treeview
[config]="config"
[items]="items"
(selectedChange)="onSelectedChange($event)">
</leo-dropdown-treeview>
Treeview without dropdown:
<leo-treeview
[config]="config"
[items]="items"
(selectedChange)="onSelectedChange($event)">
</leo-treeview>
config
is optional. This is the default configuration:
{
isShowAllCheckBox: true,
isShowFilter: false,
isShowCollapseExpand: false,
maxHeight: 500
}
You can change default configuration easily because TreeviewConfig is injectable.
Pipe leoTreeview
:
To map your JSON objects to TreeItem objects.
<leo-dropdown-treeview
[config]="config"
[items]="items | leoTreeview:'textField'"
(selectedChange)="onSelectedChange($event)">
</leo-dropdown-treeview>
Create a TreeviewItem:
const itCategory = new TreeviewItem({
text: 'IT', value: 9, children: [
{
text: 'Programming', value: 91, children: [{
text: 'Frontend', value: 911, children: [
{ text: 'Angular 1', value: 9111 },
{ text: 'Angular 2', value: 9112 },
{ text: 'ReactJS', value: 9113 }
]
}, {
text: 'Backend', value: 912, children: [
{ text: 'C#', value: 9121 },
{ text: 'Java', value: 9122 },
{ text: 'Python', value: 9123, checked: false }
]
}]
},
{
text: 'Networking', value: 92, children: [
{ text: 'Internet', value: 921 },
{ text: 'Security', value: 922 }
]
}
]
});
You can pass the second paramater 'autoCorrectChecked' with value=true (default is false) in constructor of TreeviewItem to correct checked value of it and all of its descendants. In some cases, you need to push or pop children flexibly, checked of parent may be not correct. Then you need to call function correctChecked() to help to correct from root to its descendants.
const vegetableCategory = new TreeviewItem({
text: 'Vegetable', value: 2, children: [
{ text: 'Salad', value: 21 },
{ text: 'Potato', value: 22 }
]
});
vegetableCategory.children.push(new TreeviewItem({ text: 'Mushroom', value: 23, checked: false }));
vegetableCategory.correctChecked(); // need this to make 'Vegetable' node to change checked value from true to false
TreeviewEventParser:
Extract data from list of checked TreeviewItem and send it in parameter of event selectedChange. Some built-in TreeviewEventParser:
- DefaultTreeviewEventParser: return values of checked items.
- DownlineTreeviewEventParser: return list of checked items in orginal order with their ancestors.
- OrderDownlineTreeviewEventParser: return list of checked items in checked order with their ancestors. Note that: value of a leaf must be different from value of other leaves.
TreeviewItem Template:
See example 4.
Contributing
I am very appreciate for your ideas, proposals and found bugs which you can leave in github issues. Thanks in advance!