CSD 340 (Blum)1 For Loops See Beginning JavaScript (Paul Wilton) p. 87.

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Presentation transcript:

CSD 340 (Blum)1 For Loops See Beginning JavaScript (Paul Wilton) p. 87

CSD 340 (Blum)2 Start of LoopIntro code

CSD 340 (Blum)3 Rest of LoopIntro code

CSD 340 (Blum)4 LoopIntro in the browser

CSD 340 (Blum)5 LoopHTML = " " for(i=1; i<=10; i++) { LoopHTML += "Iteration #" + i + " " } LoopHTML += " ” After the key word for, there are three items in the parentheses separated by two semicolons. –The first “i=1” says that we are going to use the variable i for counting the number of times we will repeat and that we are starting at the value of 1 –The second “i<=10” says that we will continue to repeatedly execute the statements within the structure until this condition is no longer true –The third “i++” is short hand notation for i=i+1 or i+=1 which says that after each iteration (repetition cycle) we should add 1 to i (also known as incrementing).

CSD 340 (Blum)6 Code: Changing the “initialization” (starting place)

CSD 340 (Blum)7 Browser: Changing the “initialization” (starting place)

CSD 340 (Blum)8 Code: Changing the condition

CSD 340 (Blum)9 Browser: Changing the condition

CSD 340 (Blum)10 Code: Changing the increment

CSD 340 (Blum)11 Browser: Changing the increment

CSD 340 (Blum)12 Code: Counting down by two’s

CSD 340 (Blum)13 Browser: Counting down by two’s

CSD 340 (Blum)14 Code: Let user decide

CSD 340 (Blum)15 Browser: Let user decide (1)

CSD 340 (Blum)16 Browser: Let user decide (2)

CSD 340 (Blum)17 Browser: Let user decide (3)

CSD 340 (Blum)18 Code: A single column table

CSD 340 (Blum)19 Browser: A single column table

CSD 340 (Blum)20 Code: Adding attributes

CSD 340 (Blum)21 Browser: Adding attributes

CSD 340 (Blum)22 Code: Varying the attributes

CSD 340 (Blum)23 Browser: Varying the attributes

CSD 340 (Blum)24 Code: Varying height and color

CSD 340 (Blum)25 Browser: Varying height and color