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Add new value to an existing array in JavaScript [duplicate]
...ay
// ---
arr = []; // empty array
// ---
arr = new Array(3);
alert(arr.length); // 3
alert(arr[0]); // undefined
// ---
arr = [3];
alert(arr.length); // 1
alert(arr[0]); // 3
Pushing to the array:
arr = [3]; // arr == [3]
arr[1] = 4; // arr == [3, 4]
arr[2] = 5; // arr...
How to get the selected radio button’s value?
...ios[i].checked) {
// do whatever you want with the checked radio
alert(radios[i].value);
// only one radio can be logically checked, don't check the rest
break;
}
}
<label for="gender">Gender: </label>
<input type="radio" name="genderS" value="1" checked="c...
Get the first key name of a javascript object [duplicate]
Let's assume we have the following javascript object:
8 Answers
8
...
Which “href” value should I use for JavaScript links, “#” or “javascript:void(0)”?
...re two methods of building a link that has the sole purpose of running JavaScript code. Which is better, in terms of functionality, page load speed, validation purposes, etc.?
...
Hidden Features of JavaScript? [closed]
...t I'll take just one for you, always use === and !== instead of == and !=
alert('' == '0'); //false
alert(0 == ''); // true
alert(0 =='0'); // true
== is not transitive. If you use === it would give false for
all of these statements as expected.
...
jQuery callback for multiple ajax calls
...estsCompleted({
numRequest: 3,
singleCallback: function(){
alert( "I'm the callback");
}
});
//usage in request
$.ajax({
url: '/echo/html/',
success: function(data) {
requestCallback.requestComplete(true);
}
});
$.ajax({
url: '/echo/html/',
success: f...
Declaring abstract method in TypeScript
... abstract makeSound(input : string) : string;
move(meters) {
alert(this.name + " moved " + meters + "m.");
}
}
class Snake extends Animal {
constructor(name: string) { super(name); }
makeSound(input : string) : string {
return "sssss"+input;
}
move() {
...
Get value of a string after last slash in JavaScript
...
var str = "foo/bar/test.html";
var lastSlash = str.lastIndexOf("/");
alert(str.substring(lastSlash+1));
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Case-insensitive search
...var result = string.match(/best/i);
// result == 'BEST';
if (result){
alert('Matched');
}
Using a regular expression like that is probably the tidiest and most obvious way to do that in JavaScript, but bear in mind it is a regular expression, and thus can contain regex metacharacters. If you ...
jQuery.parseJSON throws “Invalid JSON” error due to escaped single quote in JSON
...ithin strings. However, during his discussion of JSON in Appendix E of JavaScript: The Good Parts, he writes:
JSON's design goals were to be minimal, portable, textual, and a subset of JavaScript. The less we need to agree on in order to interoperate, the more easily we can interoperate.
So pe...