Resetting md-radio-button choices within an Angular 2 application

My Angular app has a sorting filter using radio buttons via md-radio-group for users to choose how they want data displayed. The radio buttons work fine, but I'm struggling to clear them when the "Restore Defaults" button is clicked.

This is the code for my view:

<filter-option name="Sort"
            placeholder="Select Sorting Option"
            [usePlaceholder]="!value"
            [visible]="sortFilters.enabled">
        <filter-label>{{value | capitalize}}</filter-label>
        <filter-menu>
            <md-radio-group class="mat-radio-label-content">
                <md-radio-button value="alphabetical" class="vert-radiobox-list" (click)="onSortClicked(value = 'alphabetical')">
                    Alphabetical
                </md-radio-button>
                <md-radio-button value="reverse alphabetical" class="vert-radiobox-list" (click)="onSortClicked(value = 'reverse alphabetical')">
                    Reverse Alphabetical
                </md-radio-button>
                <md-radio-button value="numeric ID" class="vert-radiobox-list" (click)="onSortClicked(value = 'numeric ID')">
                    Numeric ID
                </md-radio-button>
            </md-radio-group>
            <button md-button class="restore-button" (click)="clearSortingFilters()">Restore Defaults</button>
        </filter-menu>
    </filter-option>

In my component, I initialize the filter like this:

sortFilters =
{
    enabled: true,
    value: false
};

And here's the function attached to the "Restore Defaults" button:

clearSortingFilters()
{
    this.sendSort.emit(this.value = '');
}

The line 

this.sendSort.emit(this.value = '')
clears the selected filter label, but I need help clearing the radio button selections in the md-radio-group too.

javascriptangulartypescriptradio-buttonangular-material2

Answer №1

Make sure to update your code as shown below for it to function correctly:

html

<md-radio-group class="mat-radio-label-content" [(ngModel)]="selectedValue">
     <md-radio-button value="alphabetical" class="vert-radiobox-list" (click)="onSortClicked(value = 'alphabetical')">
           Alphabetical
     </md-radio-button>
     <md-radio-button value="reverse alphabetical" class="vert-radiobox-list" (click)="onSortClicked(value = 'reverse alphabetical')">
           Reverse Alphabetical
     </md-radio-button>
     <md-radio-button value="numeric ID" class="vert-radiobox-list" (click)="onSortClicked(value = 'numeric ID')">
           Numeric ID
     </md-radio-button>
</md-radio-group>    
<button md-button class="restore-button" (click)="clearSortingFilters()">Restore Defaults</button>

ts

selectedValue: string;

clearSortingFilters(){
    this.selectedValue = null; // or false or ''
  }

For a functional demo, check out the plunkr here

Answer №2

Adding NgModel to your input value is crucial in this scenario. Consider using [(ngModel)]="reverse order" to achieve the desired outcome. Additionally, updating your OnClick function to set "reverse order" to false would be beneficial.

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