javascript

[Solved] How can an array containing objects be restructured in a preferred format?

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You could use Object.values and map. Use Computed property names to create the desired object let foobar = [{“foo”:{“title”:”example title foo”,”desc”:”example description foo”}},{“bar”:{“title”:”example title bar”,”unnecessary”:”this is not needed”,”desc”:”example description bar”}}] let output = foobar.map(a => { let { title, desc } = Object.values(a)[0]; return { How can an array containing objects be restructured in a … Read more

[Solved] Javascript array filter child！ [closed]

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You could get the pathes first and then filter the given key, if it is more than in two pathes, then filter out this value. function filter(source, targets) { function getPath(array, target) { return array.reduce((r, { key, children }) => { var temp; if (key === target) return r.concat(key); if (children) { temp = getPath(children, … Read more

[Solved] Moving an object randomly on keypress

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Well, this edition works for me. Add imgWidth imgHeight vars, instead of numerical values, add width and height to each canvas redraw, and fixed positioning of img on keypress. <!doctype html> <html> <head> <link rel=”stylesheet” type=”text/css” media=”all” href=”https://stackoverflow.com/questions/47010515/css/reset.css” /> <script src=”https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js”></script> <style> body {} canvas { border: 1px; } </style> <script> $(function() { var imgWidth … Read more

[Solved] conditionall if == on javascript

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else if (thumbnailElement.className = “”) Note the single=”s, this should be === https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators#Comparison_operators You are also performing the same comparison twice in the first if and if else. if (thumbnailElement.className == “”) { thumbnailElement.className = “small” } else if (thumbnailElement.className = “”) { <– this is the same as the first one, but it”s the … Read more

[Solved] JSON.stringify and angular.toJson not working as expected

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In Javascript, two strings are equal === if they have the same data. Ex: ‘{“light”:true,”new”:true,”available”:false}’ === ‘{“light”:true,”new”:true,”available”:false}’ Note: In other languages like Java, two strings are equal == is they refer to the same instance. In that case, two strings with same data would not be ==. 1 solved JSON.stringify and angular.toJson not working as … Read more

[Solved] I can’t reach the value of the input [closed]

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The code you wrote will function correctly. However when copied directly into an editor it will throw a “Cannot read property ‘value’ of null” error. For some reason there is an issue with the way your quotation marks are being rendered and its rendering characters that aren’t actual quotation marks. Try using single quotes: <input … Read more

[Solved] Write a JavaScript conditional statement to find the sign of product of three numbers. Display an alert box with the specified sign

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Input elements have a value not, innerHTML Even if you would have corrected that, you will not have values, since you did not assign them to any variable For number only input use the number type, this will prevent someone from entering not numeral characters (in all modern browsers) document.getElementById(‘check-value’).addEventListener(‘click’, (e) => { const x … Read more

[Solved] escape

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Mixing php / js can be a bit confusing because the quotes can intersect. Notice that we’re using ” and ‘. You might want to echo with ” or with ‘ depending on what you need to accomplish. echoing with ” in php allows you to use variables in the string, ie: echo “hello {$username}” … Read more

[Solved] JS switch statement inside function

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I’m not totally sure what you’re doing, but I suspect it’s something like this: function filter(value) { switch (value) { case ‘number is required’: value=”Number field is required”; break; case ‘something else’: value=”Some other message”; break; // More cases here } return value; } $.each(response.errors, function(i, e) { msg = filter(e); $(“#errors”).append(“<div class=”error-msg”>” + msg … Read more

[Solved] How do I call my function in Javascript? [closed]

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The problem here is not how you call yea, it is everything around it. This would be fine: append( some_string + yea() + some_string ); … but where you should have strings (which could be string literals or variables or any other JavaScript expression), you have raw HTML, which isn’t allowed. You seem to have … Read more

[Solved] How to create a thumbnail image from a video in a JavaScript Application [closed]

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Using Canvas you can capture the video Thumb. here is the working example. function thumbnail(){ var canvas = document.getElementById(‘canvas’); var video = document.getElementById(‘video’); canvas.getContext(‘2d’).drawImage(video, 0, 0, video.videoWidth, video.videoHeight); } document.getElementById(‘capture’).addEventListener(‘click’, function(){ thumbnail(); }); <button id=”capture”> capture </button> <canvas id=”canvas”></canvas> <video width=”320″ height=”240″ id=”video” controls> <source src=http://techslides.com/demos/sample-videos/small.ogv type=video/ogg> <source src=http://techslides.com/demos/sample-videos/small.mp4 type=video/mp4> Your browser does not support … Read more