JavaScript Terms
Event Triggers
| onabort | => | The user aborted loading the page |
| onblur | => | The user left the object |
| onchange | => | The user changed the object |
| onclick | => | The user clicked the object |
| onerror | => | The script encountered an error |
| onfocus | => | The user made an object active |
| onload | => | The object finished loading |
| onmouseover | => | The cursor moved over an object |
| onmouseout | => | The cursor moved off an object |
| onselect | => | The user selected the contents of an object |
| onsubmit | => | The user submitted a form |
| onunload | => | The user left the page |
Comparisons
| X == Y | => | Returns True if X equals Y |
| X === Y | => | Returns True if X is identical to Y |
| X != Y | => | Returns True if X does not equal Y |
| X !== Y | => | Returns True if X is not identical to Y |
Arithmetic Operations
| + | => | Addtion - The addition operator (+) adds a value: |
| - | => | Subtraction - The subtraction operator (-) subtracts a value. |
| * | => | Multiplication - The multiplication operator (*) multiplies a value. |
| / | => | Division - The division operator (/) divides a value. |
| % | => | Modulud - The modular operator (%) returns division remainder. |
| ++ | => | Increment - The increment operator (++) increments a value. |
| -- | => | Decrement - The decrement operator (--) decrements a value. |
Assignment Operations
| = | => | The = assignment operator assigns a value to a variable. |
| += | => | The += assignment operator adds a value to a variable. |
| -= | => | The -= assignment operator subtracts a value from a variable. |
| *= | => | The *= assignment operator multiplies a variable. |
| /= | => | The /= assignment divides a variable. |
| %= | => | The %= assignment operator assigns a remainder to a variable. |
IF statements
This can also be written in short hand
This is a common do have several different things happen depending on your conditions. Below is an example that shows how you can use this to change a variable.
This can also be written in short hand
Switch / Case statements
The switch and case statement is useful when you want to set up several options instead of just two. This can still be done with an if statement if you nest several of them inside of each other. This technique can be easier to read, write, and use as well as providing a catch all that is pretty easy.
This is in my opinion a very useful when you have several options that are possible and a default answer as well.
Try / Catch statements
This is good for catching errors.