JavaScript: Check whether a specified value is a DOM element
JavaScript Object: Exercise-18 with Solution
Write a JavaScript function to check whether a given value is a DOM element.
Sample Solution: -
HTML Code:
<html>
<head>
<meta charset="utf-8">
<title>JavaScript function to check whether a specified value is a DOM element</title>
<script
src="https://code.jquery.com/jquery-3.3.1.min.js"
integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8="
crossorigin="anonymous"></script>
</head>
<body>
</body>
</html>
JavaScript Code:
function is_dom_element(obj) {
return !!(obj && obj.nodeType === 1);
}
console.log(is_dom_element(jQuery('body')[0]));
Sample Output:
true
Flowchart:
Live Demo:
See the Pen javascript-object-exercise-18 by w3resource (@w3resource) on CodePen.
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Previous: Write a JavaScript function to check if an object contains given property.
Next: JavaScript Validation Exercisess
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JavaScript: Tips of the Day
How to insert an item into an array at a specific index (JavaScript)?
What you want is the splice function on the native array object.
arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:
var arr = []; arr[0] = "Jani"; arr[1] = "Hege"; arr[2] = "Stale"; arr[3] = "Kai Jim"; arr[4] = "Borge"; console.log(arr.join()); arr.splice(2, 0, "Lene"); console.log(arr.join());
Ref: https://bit.ly/2BXbp04
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