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JavaScript Answers

How to read JSON response with Axios and JavaScript?

Sometimes, we want to read JSON response with Axios and JavaScript.

In this article, we’ll look at how to read JSON response with Axios and JavaScript.

How to read JSON response with Axios and JavaScript?

To read JSON response with Axios and JavaScript, we get the response body from the data property.

For instance, we write

try {
  const res = await axios.get("/end-point");
  console.log(res.data);
} catch (error) {
  // ...
}

to call axios.get to make a get request.

It returns a promise that has the response data.

We get the response body from res.data.

Conclusion

To read JSON response with Axios and JavaScript, we get the response body from the data property.

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React Answers

How to fix TypeError: Cannot read property ‘props’ of undefined with React?

Sometimes, we want to fix TypeError: Cannot read property ‘props’ of undefined with React.

In this article, we’ll look at how to fix TypeError: Cannot read property ‘props’ of undefined with React.

How to fix TypeError: Cannot read property ‘props’ of undefined with React?

To fix TypeError: Cannot read property ‘props’ of undefined with React, we should make sure the value of this is correct.

For instance, we write

class Parent extends React.Component {
  state = {
    //...
  };

  onDelete = () => {
    //...
  };

  render() {
    return <Child onDelete={this.onDelete} />;
  }
}

to add the onDelete function which has the value of this set to the Parent component instance since it’s an arrow function.

Conclusion

To fix TypeError: Cannot read property ‘props’ of undefined with React, we should make sure the value of this is correct.

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JavaScript Answers

How to load local JSON file to show data in a HTML page using JavaScript?

Sometimes, we want to load local JSON file to show data in a HTML page using JavaScript.

In this article, we’ll look at how to load local JSON file to show data in a HTML page using JavaScript.

How to load local JSON file to show data in a HTML page using JavaScript?

To load local JSON file to show data in a HTML page using JavaScript, we define a global variable with the object.

For instance, we write

data = {
  start: {
    count: "5",
    title: "start",
    priorities: [
      {
        txt: "Work",
      },
      {
        txt: "Time Sense",
      },
      {
        txt: "Discipline",
      }
    ],
  },
};

in data.js to define the data global variable set to an object.

Then we write

<html>
  <head> </head>
  <body>
    <script src="data.js"></script>
  </body>
</html>

to load it in our HTML code.

Conclusion

To load local JSON file to show data in a HTML page using JavaScript, we define a global variable with the object.

Categories
JavaScript Answers

How to replace backslashes with JavaScript?

Sometimes, we want to replace backslashes with JavaScript.

In this article, we’ll look at how to replace backslashes with JavaScript.

How to replace backslashes with JavaScript?

To replace backslashes with JavaScript, we call the string replace method.

For instance, we write

const replaced = str.replace(/\\/, "\\\\");

to call str.replace to replace backslashes by replacing /\\/ with "\\\\" double backslashes.

/\\/ matches the first instance of a backslash.

Conclusion

To replace backslashes with JavaScript, we call the string replace method.

Categories
JavaScript Answers

How to get coordinates of an svg element with JavaScript?

Sometimes, we want to get coordinates of an svg element with JavaScript.

In this article, we’ll look at how to get coordinates of an svg element with JavaScript.

How to get coordinates of an svg element with JavaScript?

To get coordinates of an svg element with JavaScript, we call the getBoundingClientRect method.

For instance, we write

const { x, y } = element.getBoundingClientRect();

to get the x and y coordinates of the svg element with the getBoundingClientRect method.

Conclusion

To get coordinates of an svg element with JavaScript, we call the getBoundingClientRect method.

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