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How can I check for “undefined” in JavaScript? [duplicate]
What is the most appropriate way to test if a variable is undefined in JavaScript?
16 Answers
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How to compare arrays in JavaScript?
...like .equals itself
//https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty
//Return false if the return value is different
if (this.hasOwnProperty(propName) != object2.hasOwnProperty(propName)) {
return false;
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Dynamically load JS inside JS [duplicate]
...eed to import an external JS file (under an IF condition) inside another javascript file.
13 Answers
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how to access iFrame parent page using jquery?
...page using jquery
window.parent.document.
jQuery is a library on top of JavaScript, not a complete replacement for it. You don't have to replace every last JavaScript expression with something involving $.
share
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How to convert a string to number in TypeScript?
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Exactly like in JavaScript, you can use the parseInt or parseFloat functions, or simply use the unary + operator:
var x = "32";
var y: number = +x;
All of the mentioned techniques will have correct typing and will correctly parse simple d...
Remove multiple elements from array in Javascript/jQuery
I have two arrays. The first array contains some values while the second array contains indices of the values which should be removed from the first array. For example:
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JavaScript get window X/Y position for scroll
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Using pure javascript you can use Window.scrollX and Window.scrollY
window.addEventListener("scroll", function(event) {
var top = this.scrollY,
left =this.scrollX;
}, false);
Notes
The pageXOffset property is an alias...
Why does ++[[]][+[]]+[+[]] return the string “10”?
This is valid and returns the string "10" in JavaScript ( more examples here ):
9 Answers
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How to merge two arrays in JavaScript and de-duplicate items
I have two JavaScript arrays:
76 Answers
76
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Is there a function to deselect all text using JavaScript?
Is there a function in javascript to just deselect all selected text? I figure it's got to be a simple global function like document.body.deselectAll(); or something.
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