Tips for targeting a specific element with providers in Ionic

By using the specified pattern, I am aiming to achieve a unique toolbar or header for only certain pages. Is there a way to accomplish this without injecting the provider and keeping the page as a standalone?

My understanding of Ionic is still developing, so please let me know if my explanation is unclear. Below is the code I am currently working with:

<ion-content class="no-scroll">
        <ion-header *ngIf="page.pageName != 'MyPageWithUniqueToolbar'">
            <ion-toolbar color="primary" class="sub-header">
                <ion-title class="sub-header-titl1">{{ page.ToolbarTitle }}</ion-title>
            </ion-toolbar>
        </ion-header>
        <ion-content class="no-scroll">
            <ion-nav class="content-body" [root]="rootPage" #content swipeBackEnabled="false"></ion-nav>
        </ion-content>
    </ion-content>

I attempted to place the ngIf statement above like this, but it resulted in errors:

<ion-content *ngIf="page.pageName != 'MyPageWithUniqueToolbar'" class="no-scroll">
angularjstypescriptionic2

Answer №1

In order for the *ngIf directive to function properly, you must ensure that a variable called page is defined on all page components where the *ngIf is being used. Failure to define this variable on every relevant page component may result in errors on pages lacking the appropriate page variable.

One workaround for this issue is to first verify the existence of the page variable and then check its value, as demonstrated below:

<ion-header *ngIf="page && page.pageName != 'MyPageWithUniqueToolbar'">
    <ion-toolbar color="primary" class="sub-header">
        <ion-title class="sub-header-titl1">{{ page.ToolbarTitle }}</ion-title>
    </ion-toolbar>
</ion-header>
<ion-content class="no-scroll">
    <ion-nav class="content-body" [root]="rootPage" #content swipeBackEnabled="false"></ion-nav>
</ion-content>

Remember, it is essential to have the page variable defined within the component, like so:

page = {pageName:'MyPageWithUniqueToolbar'};

We hope this explanation proves helpful!

Answer №2

Upon further examination, I discovered the answer. Simply by substituting ngIf with [hidden], the issue was resolved. Here is the updated code:

<ion-nav [hidden]="page.pageName === 'MyPageWithUniqueToolbar'" class="content-body" name="bodyHeader" [root]="state.bodyHeader.current" #bodyHeader swipeBackEnabled="false"></ion-nav>

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