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Angular · Theory

SSR & Hydration

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Theory

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SSR & Hydration

SSR & Hydration (and) is simple if you keep it on paper. Isha uses it for first paint of /marks in a public site.

Keep SSR & Hydration (and) small. Isha should finish first paint of /marks in a few lines, not a 40-line dump.

Without SSR & Hydration (and), a public site gets messy and first paint of /marks is hard to trust.

SSR & Hydration (and) shows up in a public site. Name first paint of /marks, not “a real-world scenario”.

Don’t do this with SSR & Hydration (and): using window in the constructor. Interviewers spot it in ten seconds.

Place SSR & Hydration (and) next to nearby Angular work — isPlatformBrowser + afterNextRender is the link.

One breath for SSR & Hydration (and), then first paint of /marks, then using window in the constructor. Sit down.

Exam tip

Say SSR & Hydration (and) in one breath, then isPlatformBrowser + afterNextRender, then using window in the constructor.

Example

import { Component } from "@angular/core";

@Component({
  selector: "app-root",
  template: `
    <h1>{{ title }}</h1>
    <button (click)="toggle()">Toggle</button>
    <p *ngIf="open">Panel open</p>
  `,
})
export class AppComponent {
  title = "Angular practice";
  open = true;
  toggle() {
    this.open = !this.open;
  }
}

SSR & Hydration: toggle open. Say whether the panel is on screen after one click.

Short notes

  • DefSSR & Hydration (and) — Isha uses it for first paint of /marks in a public site.
  • RuleSSR & Hydration (and) → isPlatformBrowser + afterNextRender.
  • RememberSSR & Hydration (and) + NgModule / standalone (a public site).
  • UseSSR & Hydration (and) in a public site (first paint of /marks).
  • TrapSSR & Hydration (and) — using window in the constructor.
  • ExSSR & Hydration (and) → first paint of /marks.

Questions

1

Isha asks: why does SSR & Hydration (and) exist? Use first paint of /marks.

2

Where does SSR & Hydration (and) show up in a public site?

3

How do you catch using window in the constructor?

4

Change one input on first paint of /marks. Predict the new result.

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