Recent questions tagged Javascript

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javascript - Preview images before upload

I have a page with four images for the user to select. I want the user to be able to preview each image on the ... () { readURL(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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618 views

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javascript - Upgrade to Babel 7: Cannot read property 'bindings' of null

I just upgraded to Babel 7 (from 6) by running these commands: npm remove babel-cli npm install --save-dev @babel/ ... :19) What did I do wrong? See Question&Answers more detail:os...

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

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488 views

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javascript - .append VS .html VS .innerHTML performance

This site's run a test between the 3 different methods and it seems .html is the fastest, followed by .append ... '). Can someone simplify 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 - Using JQuery plugins that transform the DOM in React Components?

Some JQuery plugins don't just add behavior to DOM nodes, but change them. For example, Bootstrap Switch turns < ... and cannot work with 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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542 views

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javascript - Best way to execute js only on specific page

I was wondering what would be the best way to execute a java-script code only on specific pages. Let's ... error, if mCanvas is undefined. See Question&Answers more detail:os...

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

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258 views

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javascript - Firestore slow performance issue on getting data

I'm having slow performance issues with Firestore while retrieving basic data stored in a document compared to the ... experience 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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459 views

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javascript - Socket.IO handling disconnect event

Can't handle this disconnect event, don't know why socket is not sent to the client / client doesn't respond! ... be deleted, but it's 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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525 views

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javascript - Promises, pass additional parameters to then chain

A promise, just for example: var P = new Promise(function (resolve, reject) { var a = 5; if (a) { ... any tricks to avoiding the inner 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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368 views

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javascript - how to break the _.each function in underscore.js

I'm looking for a way to stop iterations of underscore.js _.each() method, but can't find the solution. jQuery .each ... 2) return /*what?*/; }) See Question&Answers more detail:os...

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

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245 views

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javascript - Cross-domain XMLHttpRequest using background pages

In my Chrome extension, I want to have my options.html page communicate with something like Google's OpenId API. In ... and logic of the page. See Question&Answers more detail:os...

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

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279 views

1 answer

javascript - how to use json file in html code

I have json file mydata.json, and in this file is some json-encoded data. I want obtain this data in file ... to this field. Help out please. See Question&Answers more detail:os...

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

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642 views

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javascript - Dynamically using the first frame as poster in HTML5 video?

I'm wondering if there's any straightforward way to achieve this effect, without needing backend code to extract a ... that is not a concern. See Question&Answers more detail:os...

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

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252 views

1 answer

javascript - How to make lodash work with Angular JS?

I'm trying to use lodash use it at ng-repeat directives, in this way: <div ng-controller="GridController" ng-repeat ... How can I make it work? See Question&Answers more detail:os...

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

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313 views

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javascript - Loop through JSON object List

I am returning a List<> from a webservice as a List of JSON objects. I am trying to use a for loop to iterate ... ); } How should this be done? See Question&Answers more detail:os...

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

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308 views

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javascript - jQuery events .load(), .ready(), .unload()

Just a simple question, for the jQuery event. Are the .load(), .ready() and .unload() run in order when the DOM ... this, as I am new to jQuery? 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

1 answer

javascript - jQuery Change event on an <input> element - any way to retain previous value?

I've been searching around this morning and I'm not finding any simple solutions... basically, I want to ... not recreating the wheel here. See Question&Answers more detail:os...

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

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357 views

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javascript - Remove empty strings from array while keeping record Without Loop?

This question was asked here: Remove empty strings from array while keeping record of indexes with non ... suggestions are highly appreciated. See Question&Answers more detail:os...

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

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242 views

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javascript - How can I tell AngularJS to "refresh"

I have a click event that happens outside the scope of my custom directive, so instead of using the "ng-click" ... problem that I am not seeing? See Question&Answers more detail:os...

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

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288 views

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javascript - Is this a good way to clone an object in ES6?

Googling for "javascript clone object" brings some really weird results, some of them are hopelessly outdated and ... anything wrong with 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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286 views

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javascript - chart.js load totally new data

The API for chart.js allows one to edit points of the datasets loaded into it, for example: .update( ) Calling ... does not seem to cover 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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640 views

1 answer

javascript - Failed to instantiate module [$injector:unpr] Unknown provider: $routeProvider

I received this error upon upgrading from AngularJS 1.0.7 to 1.2.0rc1. See Question&Answers more detail:os...

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

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814 views

1 answer

javascript - How to promisify Node's child_process.exec and child_process.execFile functions with Bluebird?

I'm using the Bluebird promise library under Node.js, it's great! But I have a question: If you take a ... the real problem I am talking about. See Question&Answers more detail:os...

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

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392 views

1 answer

javascript - Google maps responsive resize

I'm trying to get google maps responsive and resize while keeping its center when windows resizes. I read other ... canvas { height: 100%; } See Question&Answers more detail:os...

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

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392 views

1 answer

javascript - jQuery - Redirect with post data

How can I redirect with post data? How to move to new page with $_POST? How to do this? How is it done and whyfore shall it be done See Question&Answers more detail:os...

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

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721 views

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javascript - Stubbing a class method with Sinon.js

I am trying to stub a method using sinon.js but I get the following error: Uncaught TypeError: Attempted to wrap ... . What am I doing wrong? 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

1 answer

javascript - Is there a proper way of resetting a component's initial data in vuejs?

I have a component with a specific set of starting data: data: function (){ return { modalBodyDisplay: ' ... initial data the only option? See Question&Answers more detail:os...

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

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358 views

1 answer

javascript - How to clear a chart from a canvas so that hover events cannot be triggered?

I'm using Chartjs to display a Line Chart and this works fine: // get line chart canvas var targetCanvas = ... I can stop this from happening? See Question&Answers more detail:os...

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

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295 views

1 answer

javascript - Remove Last Comma from a string

Using JavaScript, how can I remove the last comma, but only if the comma is the last character or if there is ... substring(0,n) return a; } See Question&Answers more detail:os...

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

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