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    .............method is used to find the note with an id that matches the parameter.

    Mohammed

    Guys, does anyone know the answer?

    get .............method is used to find the note with an id that matches the parameter. from screen.

    Document.getElementById()

    The Document method getElementById() returns an Element object representing the element whose id property matches the specified string. Since element IDs are required to be unique if specified, they're a useful way to get access to a specific element quickly.

    Document.getElementById()

    The Document method getElementById() returns an Element object representing the element whose id property matches the specified string. Since element IDs are required to be unique if specified, they're a useful way to get access to a specific element quickly.

    If you need to get access to an element which doesn't have an ID, you can use querySelector() to find the element using any selector.

    Syntax

    getElementById(id)

    Parameters

    id

    The ID of the element to locate. The ID is case-sensitive string which is unique within the document; only one element may have any given ID.

    Return value

    An Element object describing the DOM element object matching the specified ID, or null if no matching element was found in the document.

    Examples

    HTML

    getElementById example

    Some text here

    JavaScript

    function changeColor(newColor) {

    const elem = document.getElementById('para');

    elem.style.color = newColor;

    }

    Result

    Usage notes

    The capitalization of "Id" in the name of this method must be correct for the code to function; getElementByID() is not valid and will not work, however natural it may seem.

    Unlike some other element-lookup methods such as Document.querySelector() and Document.querySelectorAll(), getElementById() is only available as a method of the global document object, and not available as a method on all element objects in the DOM. Because ID values must be unique throughout the entire document, there is no need for "local" versions of the function.

    Example

    Document

    hello word1 hello word2 hello word3 hello word4

    If there is no element with the given id, this function returns null. Note that the id parameter is case-sensitive, so document.getElementById("Main") will return null instead of the element

    because "M" and "m" are different for the purposes of this method.Elements not in the document are not searched by getElementById(). When creating an element and assigning it an ID, you have to insert the element into the document tree with Node.insertBefore() or a similar method before you can access it with getElementById():

    const element = document.createElement('div');

    element.id = 'testqq';

    const el = document.getElementById('testqq'); // el will be null!

    Non-HTML documents. The DOM implementation must have information that says which attributes are of type ID. Attributes with the name "id" are not of type ID unless so defined in the document's DTD. The id attribute is defined to be of ID type in the common cases of XHTML, XUL, and other. Implementations that do not know whether attributes are of type ID or not are expected to return null.

    Specifications

    Specification DOM Standard

    # ref-for-dom-nonelementparentnode-getelementbyid②

    Browser compatibility

    Report problems with this compatibility data on GitHub

    desktop mobile Chrome Edge Firefox Opera Safari Chrome Android Firefox for Android Opera Android Safari on iOS Samsung Internet WebView Android getElementById

    Legend

    Tip: you can click/tap on a cell for more information.

    Full support Full support

    See also

    Document reference for other methods and properties you can use to get references to elements in the document.

    Document.querySelector() for selectors via queries like 'div.myclass'

    xml:id - has a utility method for allowing getElementById() to obtain 'xml:id' in XML documents (such as returned by Ajax calls)

    Found a problem with this page?

    Edit on GitHub Source on GitHub

    Report a problem with this content on GitHub

    Want to fix the problem yourself? See our Contribution guide.

    Last modified: Sep 13, 2022, by MDN contributors

    स्रोत : developer.mozilla.org

    id() function in Python

    A Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions.

    id() function in Python

    Difficulty Level : Basic

    Last Updated : 25 Nov, 2017

    Introduction

    id() is an inbuilt function in Python.

    Syntax:

    id(object)

    As we can see the function accepts a single parameter and is used to return the identity of an object. This identity has to be unique and constant for this object during the lifetime. Two objects with non-overlapping lifetimes may have the same id() value. If we relate this to C, then they are actually the memory address, here in Python it is the unique id. This function is generally used internally in Python.

    Examples:

    The output is the identity of the

    object passed. This is random but

    when running in the same program,

    it generates unique and same identity.

    Input : id(1025)

    Output : 140365829447504

    Output varies with different runs

    Input : id("geek")

    Output : 139793848214784

    # This program shows various identities

    str1 = "geek" print(id(str1)) str2 = "geek" print(id(str2))

    # This will return True

    print(id(str1) == id(str2))

    # Use in Lists

    list1 = ["aakash", "priya", "abdul"]

    print(id(list1[0])) print(id(list1[2]))

    # This returns false

    print(id(list1[0])==id(list1[2]))

    Output: 140252505691448 140252505691448 True 140252505691840 140252505739928 False

    स्रोत : www.geeksforgeeks.org

    Find object by id in an array of JavaScript objects

    I've got an array: myArray = [{'id':'73','foo':'bar'},{'id':'45','foo':'bar'}, etc.] I'm unable to change the structure of the array. I'm being passed an id of 45, and I want to get 'bar' for that

    Find object by id in an array of JavaScript objects

    Ask Question Asked 11 years ago

    Modified 6 months ago

    Viewed 2.2m times 1998 I've got an array:

    myArray = [{'id':'73','foo':'bar'},{'id':'45','foo':'bar'}, etc.]

    I'm unable to change the structure of the array. I'm being passed an id of 45, and I want to get 'bar' for that object in the array.

    How do I do this in JavaScript or using jQuery?

    javascriptarraysjavascript-objects

    Share

    Improve this question

    edited May 19, 2021 at 9:41

    Liam 26.1k27 27 gold badges 113 113 silver badges 181 181 bronze badges

    asked Sep 9, 2011 at 15:42

    thugsb 21.8k6 6 gold badges 29 29 silver badges 44 44 bronze badges Add a comment

    35 Answers

    1 2 Next 1977

    Use the find() method:

    myArray.find(x => x.id === '45').foo;

    From MDN:

    The find() method returns the first value in the array, if an element in the array satisfies the provided testing function. Otherwise undefined is returned.

    If you want to find its index instead, use findIndex():

    myArray.findIndex(x => x.id === '45');

    From MDN:

    The findIndex() method returns the index of the first element in the array that satisfies the provided testing function. Otherwise -1 is returned.

    If you want to get an array of matching elements, use the filter() method instead:

    myArray.filter(x => x.id === '45');

    This will return an array of objects. If you want to get an array of foo properties, you can do this with the map() method:

    myArray.filter(x => x.id === '45').map(x => x.foo);

    Side note: methods like find() or filter(), and arrow functions are not supported by older browsers (like IE), so if you want to support these browsers, you should transpile your code using Babel (with the polyfill).

    Share Improve this answer

    edited May 29, 2021 at 4:30

    user229044♦ 225k40 40 gold badges 323 323 silver badges 333 333 bronze badges

    answered Feb 14, 2016 at 21:11

    Michał Perłakowski 82.6k25 25 gold badges 152 152 silver badges 171 171 bronze badges 5

    For multiple testing conditions would it therefore be something like: myArray.find(x => x.id === '45' && x.color == 'red').foo –

    Apqu

    Oct 20, 2016 at 10:33

    5

    For me, best answer so far. Doesn't need jQuery neither creating new auxiliar arrays. –

    Canta

    Nov 13, 2017 at 17:38

    1

    filter actually has support back to IE9! –

    Leland

    Mar 14, 2019 at 16:54

    10

    myArray.find(x => x.id === '45').foo; throws an exception if there is no object with an id of '45'. –

    Frazer Kirkman

    Apr 10, 2019 at 17:34

    2

    Can I add multiple condition inside the find method? –

    Si8

    Dec 22, 2020 at 2:51

    Show 7 more comments

    1494

    As you are already using jQuery, you can use the grep function which is intended for searching an array:

    var result = $.grep(myArray, function(e){ return e.id == id; });

    The result is an array with the items found. If you know that the object is always there and that it only occurs once, you can just use result[0].foo to get the value. Otherwise you should check the length of the resulting array. Example:

    if (result.length === 0) {

    // no result found

    } else if (result.length === 1) {

    // property found, access the foo property using result[0].foo

    } else {

    // multiple items found

    } Share Improve this answer

    edited Jul 19, 2019 at 20:17

    CodeJunkie 1941 1 silver badge 15 15 bronze badges

    answered Sep 9, 2011 at 15:54

    Guffa 673k108 108 gold badges 718 718 silver badges 991 991 bronze badges 135

    It'd be safer to use === instead of ==, to avoid weird issues with JavaScript's == operator. –

    Vicky Chijwani

    Dec 11, 2012 at 12:03

    11

    @VickyChijwani: Are there any issues when comparing a string to a string? –

    Guffa

    Dec 11, 2012 at 12:17

    42

    Well, if you're sure that both e.id and id will be strings, I suppose it's ok to use ==. But if you're not sure, you might face problems (since '' == 0 is true but '' === 0 is false). Not to mention === seems to be faster (stackoverflow.com/questions/359494/…). –

    Vicky Chijwani

    Dec 11, 2012 at 13:19

    109

    Basically I always use === because it works like == in other programming languages. I consider == to be non-existent in JavaScript. –

    Vicky Chijwani

    Dec 11, 2012 at 13:27

    6

    @de. Many answers here provide the intended behavior when looking up unique values; you can essentially recognize them by the fact that they return or break from their loop early (or instruct a lower-level construct to stop iterating). See JaredPar's answer for a canonical example, and Aaronius's comment on that answer for the same insight. In general, people differentiate between "filter" and "find" functions in this way, but terminology varies. Though more efficient, this is still a linear search, so if you want to use a hash table, see Aaron Digulla's answer (beware of impl. details). –

    tne

    Mar 12, 2014 at 11:41

    Show 8 more comments

    स्रोत : stackoverflow.com

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    Mohammed 6 day ago
    4

    Guys, does anyone know the answer?

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