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file-uploader.component.ts
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file-uploader.component.ts
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import {
Component,
Input,
Output,
ViewChild,
EventEmitter,
TemplateRef
} from "@angular/core";
import { ControlValueAccessor, NG_VALUE_ACCESSOR } from "@angular/forms";
import { I18n } from "carbon-components-angular/i18n";
import { FileItem } from "./file-item.interface";
const noop = () => { };
/**
* [See demo](../../?path=/story/components-file-uploader--basic)
*
* <example-url>../../iframe.html?id=components-file-uploader--basic</example-url>
*/
@Component({
selector: "ibm-file-uploader",
template: `
<ng-container *ngIf="!skeleton; else skeletonTemplate">
<label [for]="fileUploaderId" class="bx--file--label">{{title}}</label>
<p class="bx--label-description">{{description}}</p>
<div class="bx--file">
<label
*ngIf="drop"
class="bx--file-browse-btn"
(keyup.enter)="fileInput.click()"
(keyup.space)="fileInput.click()"
[ngClass]="{'bx--file-browse-btn--disabled': disabled}"
tabindex="0">
<div
class="bx--file__drop-container"
[ngClass]="{'bx--file__drop-container--drag-over': dragOver}"
role="button"
(click)="fileInput.click()"
[attr.for]="fileUploaderId"
(dragover)="onDragOver($event)"
(dragleave)="onDragLeave($event)"
(drop)="onDrop($event)">
<ng-container *ngIf="!isTemplate(dropText)">{{dropText}}</ng-container>
<ng-template *ngIf="isTemplate(dropText)" [ngTemplateOutlet]="dropText"></ng-template>
</div>
</label>
<button
*ngIf="!drop"
type="button"
[ibmButton]="buttonType"
(click)="fileInput.click()"
[attr.for]="fileUploaderId"
[size]="size"
[disabled]="disabled">
{{buttonText}}
</button>
<input
#fileInput
type="file"
class="bx--file-input"
[accept]="accept"
[id]="fileUploaderId"
[multiple]="multiple"
tabindex="-1"
(change)="onFilesAdded()"
[disabled]="disabled"/>
<div class="bx--file-container">
<ng-container *ngFor="let fileItem of files">
<ibm-file [fileItem]="fileItem" (remove)="removeFile(fileItem)"></ibm-file>
<div *ngIf="fileItem.invalid" class="bx--form-requirement">
{{fileItem.invalidText}}
</div>
</ng-container>
</div>
</div>
</ng-container>
<ng-template #skeletonTemplate>
<div class="bx--skeleton__text" style="width: 100px"></div>
<div class="bx--skeleton__text" style="width: 225px"></div>
<button ibmButton skeleton="true"></button>
</ng-template>
`,
providers: [
{
provide: NG_VALUE_ACCESSOR,
useExisting: FileUploader,
multi: true
}
]
})
export class FileUploader implements ControlValueAccessor {
/**
* Counter used to create unique ids for file-uploader components
*/
static fileUploaderCount = 0;
/**
* Accessible text for the button that opens the upload window.
*
* Defaults to the `FILE_UPLOADER.OPEN` value from the i18n service
*/
@Input() buttonText = this.i18n.get().FILE_UPLOADER.OPEN;
/**
* Type set for button
*/
@Input() buttonType: "primary" | "secondary" | "tertiary" | "ghost" | "danger" = "primary";
/**
* Text set to the title
*/
@Input() title: string;
/**
* Text set to the description
*/
@Input() description: string;
/**
* Specify the types of files that the input should be able to receive
*/
@Input() accept = [];
/**
* Set to `false` to tell the component to only accept a single file on upload.
*
* Defaults to `true`. Accepts multiple files.
*/
@Input() multiple = true;
/**
* Set to `true` for a loading file uploader.
*/
@Input() skeleton = false;
/**
* Sets the size of the button.
*/
@Input() size: "sm" | "normal";
/**
* Set to `true` to enable drag and drop.
*/
@Input() drop = false;
/**
* Sets the text shown in drag and drop box.
*/
@Input() dropText: string | TemplateRef<any>;
/**
* Provides a unique id for the underlying <input> node
*/
@Input() fileUploaderId = `file-uploader-${FileUploader.fileUploaderCount}`;
/**
* Maintains a reference to the view DOM element of the underlying <input> node
*/
// @ts-ignore
@ViewChild("fileInput", { static: false }) fileInput;
/**
* The list of files that have been submitted to be uploaded
*/
@Input() files = new Set<FileItem>();
/**
* Set to `true` to disable upload button
*/
@Input() disabled = false;
@Output() filesChange = new EventEmitter<any>();
/**
* Controls the state of the drag and drop file container
*/
public dragOver = false;
protected onTouchedCallback: () => void = noop;
protected onChangeCallback: (_: Set<FileItem>) => void = noop;
constructor(protected i18n: I18n) {
FileUploader.fileUploaderCount++;
}
/**
* Specifies the property to be used as the return value to `ngModel` and reactive forms.
* Updates `this.files`.
*/
get value(): Set<FileItem> {
return this.files;
}
set value(v: Set<FileItem>) {
if (v !== this.files) {
this.files = v;
this.onChangeCallback(v);
}
}
onBlur() {
this.onTouchedCallback();
}
get fileList() {
return Array.from(this.fileInput.nativeElement.files);
}
/**
* Propagates the injected `value`.
*/
writeValue(value: Set<FileItem>) {
if (value !== this.value) {
this.files = value;
}
}
createFileItem(file): FileItem {
return {
uploaded: false,
state: "edit",
invalid: false,
invalidText: "",
file: file
};
}
onFilesAdded() {
const newFiles = new Set<FileItem>(this.files);
if (!this.multiple) {
newFiles.clear();
}
for (let file of this.fileList) {
const fileItem = this.createFileItem(file);
newFiles.add(fileItem);
}
this.value = newFiles;
this.filesChange.emit(newFiles);
}
onDragOver(event) {
event.stopPropagation();
event.preventDefault();
this.dragOver = true;
}
onDragLeave(event) {
event.stopPropagation();
event.preventDefault();
this.dragOver = false;
}
onDrop(event) {
event.stopPropagation();
event.preventDefault();
const transferredFiles: Array<File> = Array.from(event.dataTransfer.files);
const newFiles = new Set<FileItem>(this.files);
transferredFiles.filter(({ name, type }) => {
// Get the file extension and add a "." to the beginning.
const fileExtension = name.split(".").pop().replace(/^/, ".");
// Check if the accept array contains the mime type or extension of the file.
return this.accept.includes(type) || this.accept.includes(fileExtension) || !this.accept.length;
}).forEach(file => {
if (!newFiles.size || this.multiple) {
const fileItem = this.createFileItem(file);
newFiles.add(fileItem);
}
});
this.value = newFiles;
this.filesChange.emit(newFiles);
this.dragOver = false;
}
removeFile(fileItem) {
// Deleting an item from this.files removes the <ibm-file> component,
// which triggers its ngOnDestroy(), which fires the (remove) event again.
// So, (remove) may double-fire and we need to handle it here.
if (this.files && this.files.has(fileItem)) {
const newFiles = new Set<FileItem>(this.files);
newFiles.delete(fileItem);
this.filesChange.emit(newFiles);
this.value = newFiles;
}
this.fileInput.nativeElement.value = "";
}
public isTemplate(value) {
return value instanceof TemplateRef;
}
/**
* Registers the injected function to control the touch use of the `FileUploader`.
*/
registerOnTouched(fn: any) {
this.onTouchedCallback = fn;
}
/**
* Sets a method in order to propagate changes back to the form.
*/
registerOnChange(fn: any) {
this.onChangeCallback = fn;
}
/**
* `ControlValueAccessor` method to programmatically disable the checkbox.
*
* ex: `this.formGroup.get("myFileUploader").disable();`
*
* @param isDisabled `true` to disable the file uploader
*/
setDisabledState(isDisabled: boolean) {
this.disabled = isDisabled;
}
}