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JavaScript React

Learning React -Conditional Rendering

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Rendering elements or components conditionally is something that we have to do often in React components.

There are a few ways to do this.

If we are rendering something is a condition it true, then we can use the && operator:

{condition && <Component />}

When condition is true then Component will render because the first operand being true will lead to the 2nd expression being evaluated.

If we want to render something when a condition is true and render something else otherwise, then we can use the ternary operator:

{condition ? <Component /> : <OtherComponent />}

If condition is true, then Component will be rendered. Otherwise, OtherComponent will be rendered.

This is handy for conditionals with 2 cases.

If our condition has more than 2 cases, then we have to use if/else or switch statements.

We can use if/else statements as follows:

let comp;
if (foo){
  comp = <Component />;
}
else if (bar){
  comp = <OtherComponent />;
}
else if (baz){
  comp = <AnotherComponent />;
}

We assign comp with the component we want according to the condition that we’ve encountered.

This is the most versatile way to render components based on different cases,

Also, we can use the switch statement by writing:

switch (value){
  case 1: {
    comp = <Component />;
    break;
  }
  case 2: {
    comp = <OtherComponent />;
    break;
  }
  case 3: {
    comp = <AnotherComponent />;
    break;
  }
  default: {
    comp = <DefaultComponent />;
    break;
  }
}

We check the value of value against various values and assign a component to comp based on the value.

Also, we have a default case so that we can render something if the value of value doesn’t match any of the values listed in the case blocks.

We can do conditional rendering with plain JavaScript.

For simple cases, we can use the && or ternary operators.

For more complex cases, we can use if/else or switch statements.

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