Where should I put external JavaScript?

Where is the correct place to insert an external JavaScript script file?

You can place an external script reference in <head> or <body> as you like. The script will behave as if it was located exactly where the <script> tag is located. External scripts cannot contain <script> tags.

Does it matter where you put JavaScript?

It depends on what the script is designed to do. If it is using the document. write() method, then it does matter where it is on the page. If it’s trying to reference elements in the DOM, it is best put in the HEAD and have those functions that access DOM elements triggered after the page is loaded.

Where should a JavaScript function be placed?

JavaScript in body or head: Scripts can be placed inside the body or the head section of an HTML page or inside both head and body. JavaScript in head: A JavaScript function is placed inside the head section of an HTML page and the function is invoked when a button is clicked.

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Should I put JavaScript in head or body?

The best practice is to put JavaScript <script> tags just before the closing </body> tag rather than in the <head> section of your HTML. The reason for this is that HTML loads from top to bottom. The head loads first, then the body, and then everything inside the body.

How do I link an external JavaScript file?

To include an external JavaScript file, we can use the script tag with the attribute src . You’ve already used the src attribute when using images. The value for the src attribute should be the path to your JavaScript file. This script tag should be included between the <head> tags in your HTML document.

What would be the result of 1 2 3 in JavaScript?

1+ +”2″+3 results 6 1+”2″+3 results “123” AS The unary + operator converts its operand to Number type. +”2″ is a way to cast the string “2” to the number 2 . The remain is a simple addition.

Should all JavaScript be in one file?

One big file or two files: one small and one big. To be clear, during the development it’s good have separate files – maybe using something like requireJS. But when you deploy it, it’s good compress everything in one file, in order to reduce the HTTP latency and requests.

Should I put JavaScript in separate file?

You should put your JS code in a separate file because this makes it easier to test and develop. The question of how you serve the code is a different matter. Serving the HTML and the JS separately has the advantage that a client can cache the JS.

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Should jQuery be in head or body?

It’s always a good practice to add jQuery code in footer i.e. just before the closing </body> tag. If you have not done that, then use the defer attribute. The defer attribute is used to specify that the script execution occurs when the page loads.

What is the best way to practice JavaScript?

JavaScript best practices

  1. Introduction.
  2. Call things by their name — easy, short and readable variable and function names.
  3. Avoid globals.
  4. Stick to a strict coding style.
  5. Comment as much as needed but not more.
  6. Avoid mixing with other technologies.
  7. Use shortcut notation when it makes sense.
  8. Modularize — one function per task.

Which is not good practice in JavaScript?

Don’t use loose equality operator == Addition operator operand1 + operand2 : both operands should be numbers or both strings. Arithmetic operators – * / % ** : both operands should be numbers. if (condition) {…} , while (condition) {…} , etc statements: condition should be a boolean.

What is a function in JavaScript?

A JavaScript function is a block of code designed to perform a particular task. A JavaScript function is executed when “something” invokes it (calls it).

What is the main use of JavaScript?

JavaScript is a text-based programming language used both on the client-side and server-side that allows you to make web pages interactive. Where HTML and CSS are languages that give structure and style to web pages, JavaScript gives web pages interactive elements that engage a user.

What is break in JavaScript?

The break statement terminates the current loop, switch , or label statement and transfers program control to the statement following the terminated statement.

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Does JavaScript go in HTML or CSS?

JavaScript, also abbreviated to JS, is a programming language used in web development. As one of the core technologies of the web alongside HTML and CSS, JavaScript is used to make webpages interactive and to build web apps.

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