Recent questions tagged javascript

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javascript - Why is iterating through an array backwards faster than forwards

Given this code: var arr = []; for (var i = 0; i < 10000; ++i) arr.push(1); Forwards for ... test: http://jsperf.com/array-iteration-direction See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Downloading Canvas element to an image

What are the different ways to save a canvas object? In my research, I've found two approaches: var ... to customize the download filename? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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441 views

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javascript - What happens to setTimeout when the computer goes to sleep?

In a modern web browser, suppose I do a setTimeout for 10 minutes (at 12:00), and 5 minutes later put ... will reject old and invalid tokens. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - execCommand() is now obsolete, what's the alternative?

I intended to use Document.execCommand() method along with contenteditable attribute to build my custom WYSIWYG editor ... ) alternative for it? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - How to know if a function is async?

I have to pass a function to another function, and execute it as a callback. The problem is that sometimes this ... the type of the function?? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Can I determine if a string is a MongoDB ObjectID?

I am doing MongoDB lookups by converting a string to BSON. Is there a way for me to determine if the string ... res.send item else res.send 404 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - What does `node --harmony` do?

A node application has required me to run node with a harmony flag, like: node --harmony app.js What is this ... weren't of any help either. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Socket.io + PhoneGap

When I try to use Socket.IO with PhoneGap I get this error: (on iOS where socket.io should be supported) ... to get around this? Thanks!! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Webkit and jQuery draggable jumping

As an experiment, I created a few div's and rotated them using CSS3. .items { position: absolute; cursor: ... or how the browsers render webkit? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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368 views

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javascript - Scale a div to fit in window but preserve aspect ratio

How can I scale a div to fit inside the browser view port but preserve the aspect ratio of the div. How can ... using CSS and/or JQuery? Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Why does a js map on an array modify the original array?

I'm quite confused by the behavior of map(). I have an array of objects like this: const products = [{ ..., ... what I'm doing wrong! Thank you. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Auto-number table rows?

I have the following HTML table: <table border="1"> <tr> <td>blue</td> </tr> <tr> <td>red</td> </tr ... assigned to each item. How could he do? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - What do curly braces mean in JSX (React)?

For an example, to set a style in react you could do var css = {color: red} and <h1 style={css}> ... around css in the second code snippet? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - How to fire a change event on a HTMLSelectElement if the new value is the same as the old?

I have the following markup: <select onchange="jsFunction()"> <option value="1">1</option> <option value="2"> ... case. How can I achieve this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Does new React Context API trigger re-renders?

I have been trying to understand the new React Context API and was playing with it. I just wanted to check ... to that Provider updated or not? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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216 views

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javascript - I don't understand the use of $inject in controllers

I am totally confused about inject in Angular. I do not know where to use it and why. Is it only used with ... is the name of the factory. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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321 views

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javascript - Detect if HTML5 Video element is playing

I've looked through a couple of questions to find out if an HTML5 element is playing, but can't find the answer. I've ... "opacity", "1"); } } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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289 views

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javascript - Unexpected comma using map()

I've an array with a list of elements and I'm trying to append this list to an HTML element using template ... 1/jquery.min.js"></script> See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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278 views

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javascript - Loading an image to a <img> from <input file>

I'm trying to load an image selected by the user through an element. I added a onchange event handler to the ... the html. What should I do? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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333 views

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javascript - Different color for each bar in a bar chart; ChartJS

I'm using ChartJS in a project I'm working on and I need a different color for each bar in a Bar Chart ... way to paint each bar differently? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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294 views

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javascript - change html text from link with jquery

a simple question here Is there a way to change the text "click here" <a id="a_tbnotesverbergen" href="#nothing"> ... </a> in this link Richard See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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334 views

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javascript - Swap key with value in object

I have an extremely large JSON object structured like this: {A : 1, B : 2, C : 3, D : 4} I ... a new object where everything is swapped? Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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298 views

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javascript - How to disable an input type=text?

I want to disable writing in an input field of type text using JavaScript, if possible. The input field is ... user to modify its value. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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272 views

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javascript - Add a duration to a moment (moment.js)

Moment version: 2.0.0 After reading the docs, I thought this would be straight-forward (Chrome console): var ... I work through this issue. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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346 views

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javascript - How do I wait for a promise to finish before returning the variable of a function?

I'm still struggling with promises, but making some progress thanks to the community here. I have a simple JS function ... Error"); } }); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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405 views

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javascript - Change default timeout for mocha

If we have a unit test file my-spec.js and running with mocha: mocha my-spec.js The default timeout will be ... when you call: mocha my-spec.js See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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374 views

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javascript - How to filter keys of an object with lodash?

I have an object with some keys, and I want to only keep some of the keys with their value? I tried with filter ... .15/lodash.min.js"></script> See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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224 views

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javascript - How to convert to D3's JSON format?

While following numerous D3 examples, data usually gets formatted in the format given in flare.json: { " ... maintainability. Any suggestions? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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