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How do you create a multi-line comment in JavaScript?
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Date created
Mar 14, 2020
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Section 1
(50 cards)
How do you create a multi-line comment in JavaScript?
Start with a forward slash and asterisk, and then end with an asterisk and forward slash. "/" "/"
What is the DOM?
Document Object Model
How do you create an Array object in JavaScript?
var arrayVar = new Array();
How do you code a button.onclick event handler?
document.getElementById("ButtonId").onclick = functionName;
How do you make the browser load a new page using JavaScript?
window.location = "New Web Address Here";
How do you view the current web address using JavaScript?
window.location();
For textboxes, How do you get the current value?
document.getElementById("TextBoxId").value;
How do you create a function that returns a value in JavaScript?
var functionName = function(param1, param2, paramN) { //Other steps return returnValue; }
For textboxes, how do you set focus on the control?
document.getElementById("TextBoxId").focus;
In the <script> tag, how is the Type attribute used?
<script type="text/javascript"> //Used to denote the type of script being used. Always this for JavaScript
What is the string escape sequence to start a new line in JavaScript?
For checkboxes, how do you get the current checked status of the control?
document.getElementById("checkboxId").checked;
How do you assign the value from a prompt to a string?
var stringVar = prompt("Text Here");
What are the valid characters for an identifier in JavaScript?
Letters, Numbers, Underscores, and Dollar Signs
For textboxes, How do you set the control to be disabled?
document.getElementById("TextBoxId").disabled = true; //Could also be false to enable it
What is an event handler?
A function that is called with a certain event occurs. Examples of these include button.onclick and window.onload.
How do you code a while statement in JavaScript?
while (condition) {}
In the <script> tag, how is the Defer attribute used?
<script defer="defer"> //Used to ensure the code doesn't run until the rest of the page has been loaded
How do you declare a variable in JavaScript?
var variableName;
How do you test that a variable contains a valid number?
isNaN(varHere); //Returns true or false.
How do you display an alert?
alert("Alert Text Here");
What is the <noscript> tag used for?
The text between the opening and closing tag is displayed if JavaScript is disabled or otherwise not available
What are the four attributes of the <script> tag?
Type, Src, Charset, and Defer
How do you display a confirmation?
confirm("Message Text Here");
How do you access a page element by id?
document.getElementById(id);
How do you create a single line comment in JavaScript?
With two forward slashes "//"
For lists, how do you get the value or the currently selected item?
document.getElementById("listId").value;
How do you assign the return value of confirm() to a variable?
var answerVar = confirm("Message Text Here");
How do you assign actions to the window onLoad event?
window.onload = function() {//actions here}
What is AJAX?
Asynchronous JavaScript And XML
How do statements end in JavaScript?
With a semicolon ";"
How do you assign the value from a prompt to a non-string variable?
Using a parse. Example : var intVar = parseInt(prompt("Text Here"));
What is the command to display a prompt?
prompt("Text Here");
How do you create a Date object in JavaScript?
var dateVar = new Date();
Is JavaScript case sensitive?
Yes
How do you create a function in JavaScript?
var functionName = function(param1, param2, paramN) {}
In the <script> tag, how is the Src attribute used?
<script src="fileName.js"> //Used to denote external file for script use
How do you write text to the current element of the DOM?
document.write("Text Here"); //Remains on current line
What method allows you to set the digit precision of a decimal number?
toFixed(digitCount);
How do you code an If Else If statement in JavaScript?
if (condition) { } else if (condition) {}
How do you write a line to the current element of the DOM?
document.writeln("Text Here"); //Advances to new line after text
How do you assign a default value to a prompt?
Using the second parameter. Example: prompt("Enter Age:", "18");
How do you code a for statement in JavaScript?
for (counter; condition; incrementor) {}
For checkboxes, how do you get the text value of the control?
document.getElementById("checkboxId").value;
For radio buttons, how do you get the text value of the control?
document.getElementById("radioButtonId").value;
How do you code an If Else statement in JavaScript?
if (condition){ } else {}
What values can confirm() return?
True or false
How do you denote a string in JavaScript
With either single or double quotes surrounding the data
For radio buttons, how do you get the current checked status of the control?
document.getElementById("radioButtonId").checked;
How do you code an If statement in JavaScript?
if (condition) {}
Section 2
(50 cards)
What is the format to create a new Date object from a string?
var dateObject = new Date("11/22/2012 18:25:35");
What Math object method is used to return a given number rounded to the next highest integer value?
Math.ceil(number);
What is the string escape sequence to insert a tab in JavaScript?
\t
What Date object method is used to return the number of milliseconds since the start of GMT?
getTime();
What Math object method is used to return the lowest value for a set of supplied numbers?
Math.min(var1, var2, varN);
For a text area, how do you get the current value of the control?
document.getElementById("textAreaId").value;
What is the string escape sequence to insert a single quote in JavaScript?
\'
What String object method is used to get the character at a specified index position?
charAt(position);
What Date object method is used to return a string containing the date and time?
toString();
What are the available set methods for a Date object?
setFullYear(); //Sets 4 digit year setMonth(); //Sets months, starts with 0 for January setDate(); // Sets day of the month setHours(); //Sets hours in the day setMinutes(); //Sets the minutes in the current hour setSeconds(); //Sets seconds in the current minute setMilliseconds(); //Sets milliseconds in the current second
What is the string escape sequence to insert a carriage return in JavaScript?
\r
What is the string escape sequence to insert a vertical tab in JavaScript?
\v
What are the available properties for the Number object?
Number.MAX_VALUE Number.MIN_VALUE Number.POSITIVE_INFINITY Number.NEGATIVE_INFINITY Number.NaN
What Math object method is used to return a given number raised to a given power?
Math.pow(number, power);
What Number object method is used to return a numerical string with the specified number of significant digits?
toPrecision(precision);
What Math object method is used to return a random number?
Math.random() //Returns a value >= 0.0 but <1.0
What Date object method is used to return a string containing the date?
toDateString();
What are the two methods common to most controls?
focus //Brings focus to the control blur //Removes focus from the control
What are the 3 shortcuts for Number object properties?
Infinity //Represents Number.POSITIVE_INFINITY -Infinity //Represents Number.NEGATIVE_INFINITY NaN //Represents Number.NaN
What is the syntax of a conditional operator?
(Condition_Expression) ? Value_If_True : Value_If_False;
What is the escape sequence used to insert a Unicode character into a string in JavaScript?
\udddd //"dddd" is replaced by the hexadecimal value for the Unicode character
What Date object method is used to return a string containing the time?
toTimeString();
For a text area, how do you get the current character count for the control?
var areaText = document.getElementById("textAreaId").value; var charCount = areaText.length;
What Math object method is used to return the absolute value of a given number?
Math.abs(number);
What String object method is used to concatenate multiple strings?
concat(var1, var2, varN);
What String object method is used to return a new string that contains part of the original string from the specified start position?
substring(startIndex);
For a text area, how do you set the current value of the control?
document.getElementById("textAreaId").value = "Text Value";
What Math object method is used to return a given number that has been rounded to the closes integer value?
Math.round(number);
For checkboxes, how do you set the current checked status of the control?
document.getElementById("CheckboxId").checked = true; //Could also be false
What Math object method is used to return a given number rounded to the next lowest integer value?
Math.floor(number);
For radio buttons, how do you set the current checked status of the control?
document.getElementById("radioButtonId").checked = true; //Could also be false
What Number object method is used to return a string with a given number base?
toString(base); //Bases can range from 2 to 36
What Math object method is used to return the highest value from a set of supplied numbers?
Math.max(var1, var2, varN);
What is the string escape sequence to insert a backslash in JavaScript?
\\
What String object method is used return the position of the first instance of a specified search string, starting from the specified index?
indexOf(searchValue, startPosition); //If no startPosition is specified, the search begins from the start of the string
How do you alter the value of the text element in a span tag?
document.getElementById("spanId").firstChild.nodeValue = "New Value";
What is the string escape sequence to insert a double quote in JavaScript?
\"
What Number object method is used to return a number in exponential format with the specified number of decimal places?
toExponential(digits);
What Number object method is used to round numbers to the specified number of decimal places?
toFixed(digits);
How do you access the text element in a <span> tag?
document.getElementById("spanId").firstChild;
What Math object method is used to return the square root of a given number?
Math.sqrt(number);
What String object method returns a new string containing the value of the original string but in all upper case?
toUpperCase();
How do you concatenate multiple parts into a string?
var stringVar = "part 1:" + "part 2";
How do you create a new Date object?
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds);
What is the string escape sequence to insert a form feed in JavaScript?
\f
What are the available get methods for a Date object?
getTime(); getFullYear(); //Returns 4 digit year getMonth(); //Returns months, starts with 0 for January getDate(); // Returns day of the month getHours(); //Returns hours in the day getMinutes(); //Returns the minutes in the current hour getSeconds(); //Returns seconds in the current minute getMilliseconds(); //Returns milliseconds in the current second
What makes the identity operators different from the standard equality operators?
They do not perform type coercion. //Eg. If data types don't match they fail the comparison
What String object method is used to return a new string that contains part of the original string from the specified start position and up to but not including the specified stop index?
substring(startIndex, stopIndex); //stopIndex is optional, if it is not specified, then it will go until the end of the string
What are the events common to most controls?
onfocus //Fired when control receives focus onblur //Fired when control loses focus onclick //Fired when the control is clicked ondblclick //Fired when the control is double clicked onchange //Fired when the control's value is changed onselect //Fired when text is selected in a textbox or text area
What String object method returns a new string containing the value of the original string but in all lower case?
toLowerCase();
Section 3
(3 cards)