投稿時間:2021-10-10 08:13:22 RSSフィード2021-10-10 08:00 分まとめ(12件)

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Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	データベース設計書についての不明点（カラム、属性名、エンティティ、属性名）	https://teratail.com/questions/363663?rss=all	データベース設計書についての不明点カラム、属性名、エンティティ、属性名テーブル定義について質問があります。	2021-10-10 07:59:34
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	CountDownTimer()で、cancelした時間を取得したい	https://teratail.com/questions/363662?rss=all	CountDownTimerで、cancelした時間を取得したい前提・実現したいことカウントダウンタイマーでリスタートボタンを押したら、cancelした続きから開始されるようにしたいので経過時間を取得したい。	2021-10-10 07:57:29
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	python　matplotlibのエラー	https://teratail.com/questions/363661?rss=all	pythonmatplotlibのエラー前提・実現したいことpythonで以下のサイトを参考にbot作成を勉強中です。	2021-10-10 07:47:46
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	PythonでTypeErrorが出ます	https://teratail.com/questions/363660?rss=all		2021-10-10 07:27:02
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	【自身で再検証します。】pivotしたdataframeとpivotしていないdataframeを結合したい。	https://teratail.com/questions/363659?rss=all	本件について、対象データの列名の順序が違ったことが発覚しました。	2021-10-10 07:08:06
Ruby	Rubyタグが付けられた新着投稿 - Qiita	Railsで出てくるparams[:id]ってなんだ？paramsについて深く理解してみる	https://qiita.com/mokio/items/05cd9f12aae9e2395676	少しparamsが理解できてきたのではないかなと思います。	2021-10-10 07:03:58
Ruby	Railsタグが付けられた新着投稿 - Qiita	Railsで出てくるparams[:id]ってなんだ？paramsについて深く理解してみる	https://qiita.com/mokio/items/05cd9f12aae9e2395676	少しparamsが理解できてきたのではないかなと思います。	2021-10-10 07:03:58
海外TECH	DEV Community	How to make a Video Recorder with Javascript and Bootstrap	https://dev.to/abhidevelops/how-to-make-a-video-recorder-with-javascript-and-bootstrap-20of	How to make a Video Recorder with Javascript and BootstrapHi Everyone In this post I will be showing you how to make a video recorder with Javascript and Bootstrap Remember to Follow me if you want more projects Let s get started Devices that will use this app must have a working camera and access to the microphone This project will contain absolutely no CSS but will look nice because I will use Bootstrap instead I have also added a echo cancellation and download video feature in the project Below is the HTML Markup lt DOCTYPE html gt lt html gt lt head gt lt title gt Video Recorder in Javascript lt title gt lt link href dist css bootstrap min css rel stylesheet integrity sha FwmXPdgyTmZZMECAngseQBDfGTowiiMjiWaeVhAnFJkqJByhZMIAhiU crossorigin anonymous gt lt head gt lt body gt lt div id container mx auto gt lt video id gum class mx auto w d flex justify content center autoplay muted gt lt video gt lt video id recorded class mx auto w d flex justify content center playsinline loop gt lt video gt lt div class my gt lt button class btn btn primary id start gt Start camera lt button gt lt button class btn btn success id record disabled gt Record lt button gt lt button class btn btn warning id play disabled gt Play lt button gt lt button class btn btn secondary id download disabled gt Download lt button gt lt div gt lt div class m gt lt h class text info gt Video Stream Options lt h gt lt div class form check form switch gt lt input class form check input type checkbox id echoCancellation gt lt label class form check label text center for flexSwitchCheckDefault gt Echo Cancellation lt label gt lt div gt lt div gt lt div gt lt span id errorMsg gt lt span gt lt div gt lt div gt lt Linking the Scripts to our HTML File gt lt script src dist js bootstrap bundle min js integrity sha bQdsTh dapkIMST rWKFNjaCPgBSYsEBTQ RBhAHzEOgHlqTHRZ crossorigin anonymous gt lt script gt lt script src app js gt lt script gt lt body gt lt html gt Next we are going to add the Javascript so the user will be able to record a video use strict globals MediaRecorder let mediaRecorder let recordedBlobs const errorMsgElement document querySelector span errorMsg const recordedVideo document querySelector video recorded const recordButton document querySelector button record const playButton document querySelector button play const downloadButton document querySelector button download recordButton addEventListener click gt if recordButton textContent Record startRecording else stopRecording recordButton textContent Record playButton disabled false downloadButton disabled false playButton addEventListener click gt const superBuffer new Blob recordedBlobs type video webm recordedVideo src null recordedVideo srcObject null recordedVideo src window URL createObjectURL superBuffer recordedVideo controls true recordedVideo play downloadButton addEventListener click gt const blob new Blob recordedBlobs type video mp const url window URL createObjectURL blob const a document createElement a a style display none a href url a download w coder recorder test mp document body appendChild a a click setTimeout gt document body removeChild a window URL revokeObjectURL url function handleDataAvailable event console log handleDataAvailable event if event data amp amp event data size gt recordedBlobs push event data function startRecording recordedBlobs let options mimeType video webm codecs vp opus try mediaRecorder new MediaRecorder window stream options catch e console error Exception while creating MediaRecorder e errorMsgElement innerHTML Exception while creating MediaRecorder JSON stringify e return console log Created MediaRecorder mediaRecorder with options options recordButton textContent Stop Recording playButton disabled true downloadButton disabled true mediaRecorder onstop event gt console log Recorder stopped event console log Recorded Blobs recordedBlobs mediaRecorder ondataavailable handleDataAvailable mediaRecorder start console log MediaRecorder started mediaRecorder function stopRecording mediaRecorder stop function handleSuccess stream recordButton disabled false console log getUserMedia got stream stream window stream stream const gumVideo document querySelector video gum gumVideo srcObject stream async function init constraints try const stream await navigator mediaDevices getUserMedia constraints handleSuccess stream catch e console error navigator getUserMedia error e errorMsgElement innerHTML navigator getUserMedia error e toString document querySelector button start addEventListener click async gt const hasEchoCancellation document querySelector echoCancellation checked const constraints audio echoCancellation exact hasEchoCancellation video width height console log Using media constraints constraints await init constraints That s it You have now successfully created a Video Recorder with Javascript and Bootstrap Live DemoFull Code	2021-10-09 22:18:41
海外TECH	DEV Community	Javascript Data Structure - Linked list	https://dev.to/riviergrullon/javascript-datastructure-linked-list-2ocn	Javascript Data Structure Linked list DefinitionA linked list is a linear data structure that represents a collection of elements that we ll call nodes where each node points to the next one or previous one the first node in the linked list is the head and the last is the tailIn the linked list each node must be have the following properties Value The value of the nodenext A pointer to the next node in the linked list null is there no one The main properties of the linked list are Size The number of nodes in the linked list Head The first nodeTail The last nodeand the main operations of a linked list data structure are insertAt Inserts a node at the specific index removeAt Removes the node at the specific index getAt Retrieves the element at the specific index Clear Empties the linked listReverse in this case Reverses the order of nodes in the linked list Implementationclass LinkedList constructor this nodes get size return this nodes length get head return this size this nodes null get tail return this size this nodes this size null insertAt index value const previousNode this nodes index null const nextNode this nodes index null const node value next nextNode if previousNode previousNode next node console log previousNode this nodes splice index node insertFirst value this insertAt value insertLast value this insertAt this size value getAt index return this nodes index removeAt index const previousNode this nodes index const nextNode this nodes index null if previousNode previousNode next nextNode return this nodes splice index removeFirst this removeAt removeLast this removeAt this size clear this nodes reverse this nodes this nodes reduce acc value gt value next acc Symbol iterator yield this nodes Create a class with a constructor that initializes an empty array nodes for each instance Define a size getter that returns that uses Array prototype length to return the number of elements in the nodes array Define a head getter that returns the first node of the nodes array or null if empty Define a tail getter that returns the last element of the nodes array or null if empty Define an insertAt method which uses Array prototype splice to add a new object in the nodes array updating the next key of the previous element Define two convenience methods insertFirst and insertLast that use the insertAt method to insert a new element at the start or end of the nodes array respectively Define a getAt method which retrieves the element in the given index Define a removeAt method which uses Array prototype splice to remove an object in the nodes array updating the next key of the previous element Define a clear method which empties the nodes array Define a reverse method which uses Array prototype reduce and the spread operator to reverse the order of the nodes array updating the next key of each element appropriately Define a generator method for Symbol iterator which delegates to the nodes array s iterator using the yield syntax const list new LinkedList list insertFirst list insertFirst list insertFirst list insertLast list insertAt list size list head value list head next value list tail value list map e gt e value list removeAt list getAt value list head next value list map e gt e value list reverse list map e gt e value list clear list size	2021-10-09 22:09:27
Apple	AppleInsider - Frontpage News	Nomad iPhone 13 case review: Protection that hides a nifty secret	https://appleinsider.com/articles/21/10/09/nomad-iphone-13-case-review-protection-that-hides-a-nifty-secret?utm_medium=rss	Nomad iPhone case review Protection that hides a nifty secretNomad has a new lineup of cases for iPhone that includes new Sport Cases alongside the usual leather versions but they all contain a cool feature that relies on NFC Nomad s iPhone casesThe Modern Case Modern Folio Read more	2021-10-09 22:04:58
ニュース	BBC News - Home	The Papers: 'Nursing crisis' hits wards, and PM faces 'Brexit clash'	https://www.bbc.co.uk/news/blogs-the-papers-58859482?at_medium=RSS&at_campaign=KARANGA	papers	2021-10-09 22:30:32
北海道	北海道新聞	レスリング、清水と下山田敗復へ　世界選手権第８日	https://www.hokkaido-np.co.jp/article/598409/	世界選手権	2021-10-10 07:03:00