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Lecture 7 JavaScript Senior- Lecturer: Sarsenova Zh.N.

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A simple Script First JavaScript Page First JavaScript Page document.write(""); document.write("Hello World Wide Web"); document.write("");

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Embedding JavaScript

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Popup Boxes Alert box Confirm box Prompts box

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alert(), confirm(), and prompt()

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The typeof operator typeof operator used to find the type of a JavaScript variable.

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Example

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Undefined data type In JavaScript, a variable without a value, has the value undefined. The typeof is also undefined.

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Null In JavaScript null is "nothing". It is supposed to be something that doesn't exist. Unfortunately, in JavaScript, the data type of null is an object.

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Primitive Data

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Complex Data

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$Line Breaks To display line breaks inside a popup box, use a back –slash followed by the character n. Example: alert(“Hello\n How are you?”);$

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Line Breaks To display line breaks inside a popup box, use a back –slash followed by the character n. Example: alert(“Hello\n How are you?”);

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JavaScript Objects Objects in real life is for instance Students Properties: name, ID, weigh, height etc. Methods: eat, speak, walk, read, do something and etc.

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JavaScript Objects You have already learned that JavaScript variables are containers for data values.

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Objects Objects are variables too. Objects can contain many values

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Example

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Object Properties The name: values pairs are called properties.

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Object Methods Methods are actions that can be performed on objects. Methods are stored in properties as function definitions

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Example

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Accessing Object Properties 2 ways Or

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Accessing Object methods ObjectName.methodName()

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Example

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Do Not Declare Strings, Numbers, and Booleans as Objects! When a JavaScript variable is declared with the keyword "new", the variable is created as an object:

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Conditional Statements Very often when you write code, you want to perform different actions for different decisions. You can use conditional statements in your code to do this.

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Types of conditional statements if statement - use this statement if you want to execute some code only if a specified condition is true if...else statement - use this statement if you want to execute some code if the condition is true and another code if the condition is false if...else if....else statement - use this statement if you want to select one of many blocks of code to be executed switch statement - use this statement if you want to select one of many blocks of code to be executed

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If statement Syntax and example If (expression) { Statements to be executed if expression is true }

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If .. Else statement

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If…else if… statement syntax

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If…else if… statement example

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Switch Statement You should use the Switch statement if you want to select one of many blocks of code to be executed.

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Switch statement’s syntax

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The break Keyword When JavaScript reaches a break keyword, it breaks out of the switch block. This will stop the execution of more code and case testing inside the block. When a match is found, and the job is done, it's time for a break. There is no need for more testing

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The default Keyword The default keyword specifies the code to run if there is no case match:

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JavaScript Math Objects allows you to perform mathematical tasks on numbers Math.round(x) returns the value of x rounded to its nearest integer Math.round(4.7); // returns 5 Math.round(4.4); // returns 4: Math.pow(x, y) returns the value of x to the power of y: Math.pow(8, 2); // returns 64 Math.sqrt(x) returns the square root of x: Math.sqrt(64); // returns 8 Math.abs(x) returns the absolute (positive) value of x: Math.abs(-4.7); // returns 4.7 Math.ceil(x) returns the value of x rounded up to its nearest integer: Math.ceil(4.4); // returns 5 Math.floor(x) returns the value of x rounded down to its nearest integer: Math.floor(4.7); // returns 4 Math.min() and Math.max() can be used to find the lowest or highest value in a list of arguments: Math.min(0, 150, 30, 20, -8, -200); // returns -200 Math.max(0, 150, 30, 20, -8, -200); // returns 150 Math.random() returns a random number between 0 (inclusive), and 1 (exclusive): Math.random();

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Math Properties (Constants) Math.E // returns Euler's number Math.PI // returns PI Math.SQRT2 // returns the square root of 2 Math.SQRT1_2 // returns the square root of 1/2 Math.LN2 // returns the natural logarithm of 2 Math.LN10 // returns the natural logarithm of 10 Math.LOG2E // returns base 2 logarithm of E Math.LOG10E // returns base 10 logarithm of E

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JavaScript Random Integers Math.random() used with Math.floor() can be used to return random integers. Math.floor(Math.random() * 10); //returns a number between 0 and 9