Category: JavaScript

Categories
JavaScript Answers

How to change the ID of an HTML element with JavaScript?

Labrador retriever puppy walking on green grass

Sometimes, we want to change the ID of an HTML element with JavaScript

In this article, we’ll look at how to change the ID of an HTML element with JavaScript.

How to change the ID of an HTML element with JavaScript?

To change the ID of an HTML element with JavaScript, we set the id property.

For instance, we write

<p id="one">One</p>

to add a p element.

Then we write

document.getElementById("one").id = "two";

to select the element with getElementById.

And then we set its id property to the new ID.

Conclusion

To change the ID of an HTML element with JavaScript, we set the id property.

Categories
JavaScript Answers

How to execute an exe file using Node.js and JavaScript?

Labrador retriever puppy walking on green grass

Sometimes, we w=ant to execute an exe file using Node.js and JavaScript.

In this article, we’ll look at how to execute an exe file using Node.js and JavaScript.

How to execute an exe file using Node.js and JavaScript?

To execute an exe file using Node.js and JavaScript, we use the child_process module.

For instance, we write

const exec = require("child_process").execFile;

exec("hello.exe", (err, data) => {
  console.log(err);
  console.log(data.toString());
});

to call import execFile and assign it to exec.

Then we call exec with the command string with the exe we want to run.

And we get the output from data.

Conclusion

To execute an exe file using Node.js and JavaScript, we use the child_process module.

Categories
TypeScript Answers

How to fix Typescript error “This condition will always return ‘true’ since the types have no overlap”?

Labrador retriever puppy walking on green grass

Sometimes, we want to fix Typescript error "This condition will always return ‘true’ since the types have no overlap".

In this article, we’ll look at how to fix Typescript error "This condition will always return ‘true’ since the types have no overlap".

How to fix Typescript error "This condition will always return ‘true’ since the types have no overlap"?

To fix Typescript error "This condition will always return ‘true’ since the types have no overlap", we should make sure our boolean isn’t always true.

For instance, we write

const frType: "Child" | "Infant" = "Child";
const rightType = frType !== "Child" || frType !== "Infant";

then we get the error because frType can either be 'Child' or 'Infant'.

But we’re checking if frType isn’t 'Child' or 'Infant', which means it always returns true since frType can only be 1 of the 2 values.

Conclusion

To fix Typescript error "This condition will always return ‘true’ since the types have no overlap", we should make sure our boolean isn’t always true.

Categories
React Answers

How to fix current is always null when using React.createRef with React?

Labrador retriever puppy walking on green grass

Sometimes, we want to fix current is always null when using React.createRef with React.

In this article, we’ll look at how to fix current is always null when using React.createRef with React.

How to fix current is always null when using React.createRef with React?

To fix current is always null when using React.createRef with React, we assign the ref created by createRef to an element.

For instance, we write

class App extends React.PureComponent {
  constructor(props) {
    super(props);
    this.test = React.createRef();
  }

  handleClick = () => console.log(this.test.current.value);

  render() {
    return (
      <div>
        <input ref={this.test} />
        <button onClick={this.handleClick}>Get Value</button>
      </div>
    );
  }
}

to create the test ref with createRef.

Then we assign test as the value of the ref prop of the input.

Finally, we get the ref’s value with this.test.current.value, which should be set to the input.

Conclusion

To fix current is always null when using React.createRef with React, we assign the ref created by createRef to an element.

Categories
Vue Answers

How to use onfocusout function in Vue.js?

Labrador retriever puppy walking on green grass

Sometimes, we want to use onfocusout function in Vue.js.

In this article, we’ll look at how to use onfocusout function in Vue.js.

How to use onfocusout function in Vue.js?

To use onfocusout function in Vue.js, we listen for the blur event.

For instance, we write

<template>
  <input @blur="handleBlur" />
</template>

to set the handleBlur method as the blur event handler function.

handleBlur is called when we move focus away from the input.

Conclusion

To use onfocusout function in Vue.js, we listen for the blur event.