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| Section | Objectives |
|---|---|
| Testing, Debugging, and Deployment | - Deployment practices
|
| User Interface Development | - Lightning Component Development
|
| Advanced Apex Programming and Data Modeling | - Data Modeling
|
| Integration and Security | - Security implementation
|
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NEW QUESTION # 52
Universal Containers は、取引先に関連付けられた取引先責任者のリストを取得する Lightning Web コンポーネントとその Apex コントローラクラスを分析します。コードの抜粋は次のとおりです。
コードスニペットに基づいて、Lightning Web コンポーネントで取引先責任者のメールアドレスを表示するにはどのような変更を加える必要がありますか?
Answer: A
Explanation:
To display the contacts' mailing addresses in the Lightning web component, both the SOQL query in the getAccountContacts method and the columns attribute in the JavaScript file of the component need to be updated. The query must include the MailingAddress field, and the JavaScript file must be modified to add this field to the columns shown in the lightning-datatable.References: Lightning Web Components Developer Guide - lightning-datatable
NEW QUESTION # 53
カスタムインターフェースの一部として、開発者チームはさまざまな新しい Lightning Web コンポーネントを作成します。各コンポーネントはトースト メッセージを使用してエラーを処理します。開発が完了すると、すべてのコンポーネントが同じ Lightning ページに追加されます。
受け入れテスト中に、コンポーネントの読み込み中にエラーが発生したときに表示されるトースト メッセージの長いチェーンについてユーザーから苦情が寄せられました。
ユーザー エクスペリエンスを向上させるために開発者が実装する必要がある 2 つのテクニックはどれですか?
2 つの答えを選択してください
Answer: A,D
Explanation:
The scenario describes a common issue when multiple components are used on the same Lightning page and each component manages its error handling independently, leading to a "long chain of toast messages" which can be overwhelming for users.
To improve user experience, the developers can implement the following techniques:
A: Use a Lightning web component to aggregate and display all errors: This method involves creating a centralized component responsible for handling all error messages. This component would receive error notifications from other components and then display them in a user-friendly manner. The benefit of this approach is that it provides a single, consistent interface for error messages, reducing the clutter and confusion that can be caused by multiple toasts.
D: Use public properties on each component to display the error messages: By using public properties, components can expose their error states to a parent or orchestrating component, which can then display these errors in a single, consolidated way. This avoids the issue of multiple toast notifications and allows for a more integrated error handling experience.
The other options presented are less ideal:
B: Using the window.alert() method is not recommended in a professional Salesforce environment as it is considered a disruptive way to show errors and does not align with the Salesforce Lightning design system.
C: Using a <template> tag to display in-place error messages could be a viable option for displaying error messages within the component itself, but it does not address the issue of multiple errors stacking up from different components as described in the scenario.
References:
For building a centralized error handling component: Lightning Web Components Developer Guide - Error Handling For implementing public properties: Lightning Web Components Developer Guide - Public Properties
NEW QUESTION # 54
開発者は、次の HTML スニペットを使用して、sObject Lightning ページに存在する再利用可能な Aura コンポーネントを開発しています。
HTML
<aura:component implements="force:hasRecordId,flexipage:availableForAllPageTypes">
<div>こんにちは！</div>
</aura:component>
追加のテスト カバレッジを必要とせずに、コンポーネントのコントローラが sObject が存在する Lightning ページのコンテキストを取得するにはどうすればよいでしょうか?
Answer: D
Explanation:
In Aura components, Salesforce provides specific interfaces that "inject" context into the component automatically. The developer is already using force:hasRecordId, which automatically populates a recordId attribute with the ID of the current record.
To get the API Name of the sObject (e.g., "Account" or "Contact") without writing Apex code or requiring manual configuration in the App Builder, the developer should implement force:hasSObjectName (Option D). When this interface is added to the implements attribute, the framework automatically provides an attribute named sObjectName to the component.
This is the most efficient solution because:
* It is purely declarative and handled by the Lightning framework.
* It requires zero Apex code, meaning there is no need for additional unit tests or code coverage (satisfying the requirement "without requiring additional test coverage").
* It makes the component truly reusable; you can drop it on an Account page, a Contact page, or any custom object page, and it will immediately know which object it is currently displaying.
Options A and B require manual configuration or hardcoding, which reduces reusability. Option C requires an Apex call, which adds complexity and necessitates writing test classes for coverage.
NEW QUESTION # 55
開発者は、取引先レコードページのカスタム Lightning Web コンポーネントからボタンがクリックされたときに、外部システムへの HTTP コールアウトを作成して特殊なデータを取得する Apex メソッドを作成しました。
最近、ボタンをクリックした後、データがページに表示されるまでに必要以上に時間がかかるという苦情がユーザーから寄せられています。
この問題をトラブルシューティングするために、開発者は何を使用する必要がありますか?
Answer: C
NEW QUESTION # 56
Visuzlforce ページは、表示されるデータが大量であるため、読み込みに時間がかかります。
開発者はパフォーマンスを向上させるためにどの戦略を使用できますか?
Answer: D
Explanation:
Lazy loading is a strategy to improve the performance of a Visualforce page that loads a large amount of data.
By loading the data on demand, rather than in the controller's constructor, the initial page load is faster, and additional data is only loaded when necessary.References: Visualforce Developer Guide - Improving Performance
NEW QUESTION # 57
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