如何在角形材料中使用输入类型文件
您好,我正在使用棱角材料进行设计。当我在角形材质站点上时,没有输入类型文件元素。任何人都知道这一点。
答案 0 :(得分:12)
如果您只需要一个显示良好的文件输入按钮,那么这里是一种解决方法。
HTML
<button type="button" mat-raised-button (click)="fileInput.click()">Choose File</button>
<input hidden (change)="onFileSelected()" #fileInput type="file" id="file">
组件
onFileSelected() {
const inputNode: any = document.querySelector('#file');
if (typeof (FileReader) !== 'undefined') {
const reader = new FileReader();
reader.onload = (e: any) => {
this.srcResult = e.target.result;
};
reader.readAsArrayBuffer(inputNode.files[0]);
}
}
受此Angular Material Github问题评论的启发 https://github.com/angular/material2/issues/3262#issuecomment-309000588
答案 1 :(得分:6)
Angular Material还不支持文件上传的解决方法。 还有其他方法可以存档。例如使用外部库。
角度材料文件上传:link to npm package
支持的功能:
ngx-material-file-input :Link to repository
支持的功能:
ngx-mat-file-input
组件,用于在Angular Material mat-form-field
中使用FileValidator
的{{1}},以限制文件大小maxContentSize
,以人类可读的格式设置文件大小答案 2 :(得分:2)
答案 3 :(得分:0)
如果您不想使用一些奇怪的解决方法,则不要将input
放入mat-form-field
中。您可以将其放置在mat-form-field
之外,但仍将值包括在FormGroup
中。检查示例
<form [formGroup]="someForm" (ngSubmit)="onSubmit()">
<!--input outside the form-field-->
<input type="file" (Change)="onChange($event)"/>
<mat-form-field>
<!--input inside the form-field-->
<input matInput formControlName="someFCN">
</mat-form-field>
<button mat-raised-button>Submit</button>
</form>
import { FormBuilder, FormGroup, Validators } from '@angular/forms';
someForm: FormGroup;
constructor(private formBuilder: FormBuilder) {}
ngOnInit(): void {
this.someForm = this.formBuilder.group({
someFCN: [{ value:'', disabled: false },Validators.required],
file: { value:'', disabled: false }
});
}
onChange(event: Event) {
/*not sure what you want to do with file, i'll just set
selected file´s name as value, but obviously u can do much more than just get file´s name.*/
this.someForm.controls['file'].setValue(event.target.files[0].name);
}
onSubmit() {
return this.someForm.getRawValue();
}
答案 4 :(得分:0)
让 style the default input element of type file using the ::file-selector-button 看起来像有角度的材质按钮更有意义。此外,这种方式考虑了 UX,它通过显示文件名让用户知道要上传的文件已添加到表单中。
<块引用>附言检查后从声明中复制了样式 角垫凸起按钮
input[type="file"]::file-selector-button {
box-shadow: 0px 3px 1px -2px rgb(0 0 0 / 20%), 0px 2px 2px 0px rgb(0 0 0 / 14%), 0px 1px 5px 0px rgb(0 0 0 / 12%);
background: #ffd740;
box-sizing: border-box;
position: relative;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
cursor: pointer;
outline: none;
border: none;
-webkit-tap-highlight-color: transparent;
display: inline-block;
white-space: nowrap;
text-decoration: none;
vertical-align: baseline;
text-align: center;
margin: 0;
min-width: 64px;
line-height: 36px;
padding: 0 16px;
border-radius: 4px;
overflow: visible;
transform: translate3d(0, 0, 0);
transition: background 400ms cubic-bezier(0.25, 0.8, 0.25, 1), box-shadow 280ms cubic-bezier(0.4, 0, 0.2, 1);
margin: 1rem;
}
/* fallback for older browsers supporting the -webkit prefix */
input[type="file"]::-webkit-file-upload-button {
box-shadow: 0px 3px 1px -2px rgb(0 0 0 / 20%), 0px 2px 2px 0px rgb(0 0 0 / 14%), 0px 1px 5px 0px rgb(0 0 0 / 12%);
background: #ffd740;
box-sizing: border-box;
position: relative;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
cursor: pointer;
outline: none;
border: none;
-webkit-tap-highlight-color: transparent;
display: inline-block;
white-space: nowrap;
text-decoration: none;
vertical-align: baseline;
text-align: center;
margin: 0;
min-width: 64px;
line-height: 36px;
padding: 0 16px;
border-radius: 4px;
overflow: visible;
transform: translate3d(0, 0, 0);
transition: background 400ms cubic-bezier(0.25, 0.8, 0.25, 1), box-shadow 280ms cubic-bezier(0.4, 0, 0.2, 1);
margin: 1rem;
font-weight: 500;
}
<form>
<label for="fileUpload">Add file</label>
<input type="file" id="fileUpload">
</form>