Author: John Au-Yeung

Web developer specializing in React, Vue, and front end development.

Categories
Python Answers

How to run JavaScript in Selenium using Python?

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Sometimes, we want to run JavaScript in Selenium using Python.

In this article, we’ll look at how to run JavaScript in Selenium using Python.

How to run JavaScript in Selenium using Python?

To run JavaScript in Selenium using Python, we can use the execute_script method.

For instance, we write

from selenium import webdriver

driver = webdriver.Firefox()
driver.get("http://example.com")
driver.execute_script("document.getElementByElement('foo').click()")

to call driver.get to open the http://example.com page.

Then we call execute_script with "document.getElementByElement('foo').click()" to run "document.getElementByElement('foo').click()".

Conclusion

To run JavaScript in Selenium using Python, we can use the execute_script method.

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Vue Answers

How to fix Vue.js unknown custom element error with JavaScript?

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Sometimes, we want to fix Vue.js unknown custom element error with JavaScript.

In this article, we’ll look at how to fix Vue.js unknown custom element error with JavaScript.

How to fix Vue.js unknown custom element error with JavaScript?

To fix Vue.js unknown custom element error with JavaScript, we register our component before we use it.

To register it globally, we call Vue.component like

Vue.component("my-task", {
  // ...
});

new Vue({
  // ...
});

We create a register the my-task component with Vue.component.

To register a component locally, we write

export default {
  data() {
    return {};
  },
  components: {
    "my-task": MyTask,
  },
};

to register the my-task component in another component.

We set the my-task tag to render the MyTask component.

Conclusion

To fix Vue.js unknown custom element error with JavaScript, we register our component before we use it.

Categories
JavaScript Answers

How to use scrollIntoView with a fixed position header with JavaScript?

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Sometimes, we want to use scrollIntoView with a fixed position header with JavaScript.

In this article, we’ll look at how to use scrollIntoView with a fixed position header with JavaScript.

How to use scrollIntoView with a fixed position header with JavaScript?

To use scrollIntoView with a fixed position header with JavaScript, we can call scroll to scroll to the element at the given position.

For instance, we write

const node = document.getElementById("foo");
const yourHeight = 200;

node.scrollIntoView(true);

const scrolledY = window.scrollY;

if (scrolledY) {
  window.scroll(0, scrolledY - yourHeight);
}

to select the element we want to scroll to with getElementById.

Then we call node.scrollIntoView to scroll to the element.

Next, we call window.scrollto to scroll to scrolledY - yourHeight to scroll to the given position.

Conclusion

To use scrollIntoView with a fixed position header with JavaScript, we can call scroll to scroll to the element at the given position.

Categories
JavaScript Answers

How to test the type of a DOM element in JavaScript?

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Sometimes, we want to test the type of a DOM element in JavaScript.

In this article, we’ll look at how to test the type of a DOM element in JavaScript.

How to test the type of a DOM element in JavaScript?

To test the type of a DOM element in JavaScript, we can check the nodeName property of the element.

For instance, we write

if (element.nodeName === "A") {
  //...
} else if (element.nodeName === "TD") {
  //...
}

to check if element is an a element with

element.nodeName === "A"

And we check if element is a td element with

element.nodeName === "TD"

Conclusion

To test the type of a DOM element in JavaScript, we can check the nodeName property of the element.

Categories
TypeScript Answers

How to iterate over array of objects in TypeScript?

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Sometimes, we want to iterate over array of objects in TypeScript.

In this article, we’ll look at how to iterate over array of objects in TypeScript.

How to iterate over array of objects in TypeScript?

To iterate over array of objects in TypeScript, we can use a for-of loop.

For instance, we write

for (const product of products) {
  console.log(product.productDesc);
}

to loop through the products array with a for-of loop.

In it, we log the productDesc property of the products object entry being looped through, which is stored in product.

Conclusion

To iterate over array of objects in TypeScript, we can use a for-of loop.