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Programming Scripts Articles
Page 9 of 33
TypedArray.byteLength property in JavaScript
The byteLength property of the TypedArray object represents the length of its(in bytes)TypedArray.SyntaxIts Syntax is as followstypedArray.byteLength();Example JavaScript Example var buffer = new ArrayBuffer(156); var float32 = new Float32Array(buffer); document.write(float32.byteLength); Output156
Read MoreTypedArray.byteOffset property in JavaScript
The byteOffset property of the TypedArray represents the offset of the current object.SyntaxIts Syntax is as followstypedArray.byteOffset();Example JavaScript Example var buffer = new ArrayBuffer(156); var float32 = new Float32Array(buffer); document.write(float32.byteOffset); Output0
Read MoreHow to subtract Python timedelta from date in Python?
The Python datetime module provides various ways for manipulating dates and times. One of its key features is the timedelta object, which represents duration and also the difference between two dates or times. Subtracting a specific amount of time from a date can be done using timedelta. For example, if we want to find the date a day before today, then we create a timedelta object with days=1 and then subtract it from the current date. Subtracting One Day from Today's Date Using timedelta The basic use case is subtracting a single day from today's date. This can be done ...
Read MoreWhat is the difference between #define and const Keyword in C++?
In C++, both #define and const are used to define constants in a program. The #define is a preprocessor directive that creates macros with their fixed values whereas const is a keyword which declare value of variable as constant, meaning its value cannot be changed after intialization. Therefore they have different use cases in different scenarios. In this article, we will learn the differences between these two in detail. #define in C++ The #define is a preprocessor directive that is used to define or assign macros ( name or string ) with a constant value. So wherever the macro occurs ...
Read MoreWhat is the difference between setTimeout() and setInterval() in JavaScript?
setTimeout() function setTimeout( function, duration) − This function calls function after duration milliseconds from now. This goes for one execution. Let’s see an example − It waits for 2000 milliseconds, and then runs the callback function alert(‘Hello’) − setTimeout(function() { alert('Hello');}, 2000); setInterval() function setInterval(function, duration) − This function calls function after every duration milliseconds. This goes for unlimited times. Let’s see an example − It triggers the alert(‘Hello’) after every 2000 milliseconds, not only once. setInterval(function() { alert('Hello');}, 2000);
Read MoreHow to return a random number between 1 and 200 with JavaScript?
To return a random number between 1 and 200, use the JavaScript's Math.random() and Math.floor() method. Example You can try to run the following code to return a random number in JavaScript. document.write(Math.floor(Math.random() * 200) + 1);
Read MoreAre there any style options for the HTML5 Date picker?
The date picker in HTML5 shows a popup like a calendar. This is the same as selecting the months and years and this adds the date. Example: Style options for HTML date pickerYou can also customize the popup and add background color as well. You can try to run the following code to add style options for HTML date picker − ::-webkit-datetime-edit { padding: 4 em; } ::-webkit-datetime-edit-fields-wrapper { background:blue; } ::-webkit-datetime-edit-text { padding: 0 0.5em; } Editing a month, day and year field The following is to edit a month, day and year field − ::-webkit-datetime-edit-month-field { color: white; } ::-webkit-datetime-edit-day-field { color: red; } ::-webkit-datetime-edit-year-field { color: red; } ::-webkit-calendar-picker-indicator { background:gray; }
Read Moreffmpeg settings for converting to mp4 and ogg for HTML5 video
Convert videos to proper formats for HTML5 video on Linux shell using ffmpeg.When converting to an MP4, you want to use the h264 video codec and the aac audio codec because IE11 and earlier only support this combination. ffmpeg -i input.mov -vcodec h264 -acodecaac -strict -2 output.mp4In this example, input.mov is converted to output2.mp4 with maximum compatibility, with Quicktime support, and without an audio stream. ffmpeg -an -i input.mov -vcodec libx264 -pix_fmt yuv420p -profile:v baseline -level 3 output2.mp4For Firefox compatible ogg video, ffmpeg2theora should be installed. Here the input file is output file from the ffmpeg conversion done before. ...
Read MoreCreate editable content in an HTML document
In Html, we can edit the content by using contenteditable attribute, it specifies whether the elements content is editable or not by the user. The property of contentEditable is set or returns if the content of an element is editable. Syntax The usage/syntax of editable content in HTML is − The above contenteditable attribute has two values true/false. True indicates that the element is editable. False indicates that the element cannot be edited. Example Following is the example, to create editable content in an HTML − This ...
Read MoreHow to display the selected option in a dropdown list with JavaScript?
In this tutorial, we will learn how to display the selected option in a dropdown list with JavaScript. What is a dropdown list? A dropdown list is a switchable menu that enables users to select one item from various options. A drop-down list is generated with the tag is most frequently used in forms to gather user input. After submitting the form, the name attribute must refer to the form's data. The DOM API functions getElementById() and querySelector() can be used to choose a element. The process use the querySelector() function to first select the "button" and "select" ...
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