Recent questions tagged Javascript

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javascript - How to check if a number is negative?

I want to check if a number is negative. I'm searching for the easiest way, so a predefined JavaScript function ... else { return false; } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Mongoose - Create document if not exists, otherwise, update- return document in either case

I'm looking for a way to refactor part of my code to be shorter and simpler, but I don't know Mongoose very well ... throw error; } }); } }); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Why is there no same-origin policy for WebSockets? Why can I connect to ws://localhost?

I'd like to use WebSockets for inter-process communication for my application (Daemon<->WebGUI and Daemon<- ... websocket.org definitely works. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - react router v^4.0.0 Uncaught TypeError: Cannot read property 'location' of undefined

I've been having some trouble with react router (i'm using version^4.0.0). this is my index.js import ... much for your patience and help!! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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713 views

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javascript - iOS 10 Safari: Prevent scrolling behind a fixed overlay and maintain scroll position

I'm not able to prevent the main body content from scrolling while a fixed position overlay is showing. Similar questions ... > </body> </html> See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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242 views

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javascript - What is the best way to hide the screen while knockout js bindings are being built?

I'm a huge knockoutjs fan. I use it for all my web development now and simply love it. One thing that I' ... reference (ie. ui-helper-hidden). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - How to force update Single Page Application (SPA) pages?

In fully server side based rendering (non Web 2.0), deploying server side code would directly update client ... is updated with newer version. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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247 views

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javascript - How to generate short uid like "aX4j9Z" (in JS)

For my web application (in JavaScript) I want to generate short guids (for different objects - that are actually ... regenerate it if it does. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Difference between 'self' and 'total' in Chrome CPU Profile of JS

What is the difference between the 'self' and 'total' columns in the Chrome CPU profiling of JS code? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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524 views

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javascript - Twitter Bootstrap Typeahead - Id & Label

I'm using Bootstrap 2.1.1 and jQuery 1.8.1 and trying to use Typeahead's functionality. I try to ... selected ID in another hidden field? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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459 views

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javascript - How to set selected select option in Handlebars template

With a Handlebars.js template like this... <select> <option value="Completed">Completed</option> <option value=" ... Which way is the easiest? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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552 views

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javascript - Instagram: Share photo from webpage

In my shopping site I had implemented the functionality for 'Login via Instagram' and found it is working well. ... , twitter, google+ etc. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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508 views

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javascript - What is the difference between Progressive Enhancement and Graceful Degradation?

I'm confused on what the difference is between Progressive Enhancement and Graceful Degradation. To me they seem like ... one over the other? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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476 views

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javascript - Generate Random Color distinguishable to Humans

I am trying to randomly generate a color in hex in javascript. However the colors generated are almost ... help. Thanks in Advance See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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250 views

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javascript - Tooltips with Twitter Bootstrap

I am using Twitter Bootstrap--and I am not a frontend developer! However, it's making the process almost--dare ... of a name identifier (#name)? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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233 views

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javascript - What is an "event emitter"?

Browsing through http://microjs.com, I see lots of libraries labelled "event emitters". I like to think I know ... me? It sounds interesting... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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252 views

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javascript - Dynamically add child components in React

My goal is to add components dynamically on a page/parent component. I started with some basic example template like ... a way of doing it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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202 views

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javascript - While debugging, can I have access to the Redux store from the browser console?

I have unit tests for my reducers. However, when I'm debugging in the browser, I want to check if my actions ... going. How can I achieve that? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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555 views

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javascript - What is the difference between .js and .mjs files?

I have started working on an existing project based on Node.js. I was just trying to understand the flow of ... files (how does it benefit)? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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123 views

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javascript - What is the purpose of the html form tag

I do not understand the purpose of the form tag in html. I can easily just use any input types perfectly ... . Maybe I'm missing something. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

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javascript - Redis connection to 127.0.0.1:6379 failed - connect ECONNREFUSED

I working with node.js by expressjs I try to store an account to session. So, i try to test to use ... . Please help me resolve this problem See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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270 views

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javascript - Making the while loop synchronous

I've got a following piece of code var page = 2; var last_page = 100; while(page <= last_page) { request( ... ; async.series( async_arr, done ); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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269 views

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javascript - New reCaptcha with jQuery Validation Plugin

I searched and can't figure out how to validate the new reCaptcha, before form submit, along with the validate ... of the validate() function. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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308 views

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javascript - Local storage vs AngularJS $cacheFactory

I have a problem of storing a lot of client-side data, and I can't decide which way is better. Now I' ... it worth to use local storage instead? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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286 views

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javascript - How to select first parent DIV using jQuery?

var classes = $(this).attr('class').split(' '); // this gets the current element classes var classes = $( ... first parent DIV of $(this). thx See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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251 views

1 answer

javascript - how to config grunt.js to minify files separately

there are some js files in static/js/ 1. a.js 2. b.js 3. c.js how to config grunt.js to get below files: 1. ... , dest: 'js/min/xxx.min.js' } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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189 views

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javascript - Understanding how D3.js binds data to nodes

I'm reading through the D3.js documentation, and am finding it hard to understand the selection.data method from ... and what does it return? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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147 views

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javascript - How do I connect to mongodb with node.js (and authenticate)?

How do I connect to mongodb with node.js? I have the node-mongodb-native driver. There's apparently 0 ... do I insert something? Thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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