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Unit 2 — The Exciting World of JavaScript

Unit 2 — The Exciting World of JavaScript. Lesson 8 — Using JavaScript with Frames. Objectives. Create a JavaScript function with a parameter list. Create JavaScript-enabled hyperlinks that affect frames. Create JavaScript-enabled buttons that affect frames.

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Unit 2 — The Exciting World of JavaScript

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  1. Unit 2 — The Exciting World of JavaScript Lesson 8 — Using JavaScript with Frames

  2. Objectives • Create a JavaScript function with a parameter list. • Create JavaScript-enabled hyperlinks that affect frames. • Create JavaScript-enabled buttons that affect frames. • Create top-level JavaScript functions. The Exciting World of JavaScript

  3. Advanced JavaScript Programming • The parent/child concept: In order for a JavaScript function to access an object in a different file, the two files must be linked. The “parent” frame set can be referenced with a JavaScript object. The frame set file defines “child” frames, and these frames are given names. • To apply this concept, create a JavaScript-ready frame set. The Exciting World of JavaScript

  4. Advanced JavaScript Programming (cont.) • No. 1: Save HTML code necessary to define the parent/child frame set pages. <HTML> <HEAD> <TITLE>HTML and JavaScript</TITLE> </HEAD> <FRAMESET ROWS="140,*"> <FRAME NAME="upperFrame" SRC="upper1.html"> <FRAME NAME="lowerFrame" SRC="lower1.html"> </FRAMESET> </HTML> The Exciting World of JavaScript

  5. Advanced JavaScript Programming (cont.) • No. 2: Save the HTML page for the upper frame. <HTML> <HEAD> <TITLE>HTML and JavaScript</TITLE> </HEAD> <BODY> <CENTER> <IMG NAME="upperImage" SRC="lions.gif"> </CENTER> </HTML> The Exciting World of JavaScript

  6. <HTML> <HEAD> <TITLE>HTML and JavaScript</TITLE> </HEAD> <BODY> <CENTER> <H2>IMAGE LIST</H2> <TABLE> <TR><TD>1: LIONS.GIF</TD></TR> <TR><TD>2: TIGERS.GIF</TD></TR> <TR><TD>3: BEARS.GIF</TD></TR> <TR><TD>4: OHMY.GIF</TD></TR> </TABLE> </CENTER> </BODY> </HTML> Advanced JavaScript Programming (cont.) • No. 3: Save the HTML page for the lower frame. The Exciting World of JavaScript

  7. Advanced JavaScript Programming (cont.) • Display the js-test16.html file, which displays two files. upper1.html lower1.html The Exciting World of JavaScript

  8. Adding JavaScript Code to Your Frame Set • No. 1: Change the name of the lower frame file. <HTML> <HEAD> <TITLE>HTML and JavaScript</TITLE> </HEAD> <FRAMESET ROWS="140,*"> <FRAME NAME="upperFrame" SRC="upper1.html"> <FRAME NAME="lowerFrame" SRC="lower2.html"> </FRAMESET> </HTML> The Exciting World of JavaScript

  9. Adding JavaScript Code to Your Frame Set (cont.) • No. 2: Save a new lower2.html file with a JavaScript function using if statements and the parameter (number) to determine which graphic to use in the upper frame. function setImage(number) { if(number == 1) { parent.upperFrame.document.upperImage.src="lions.gif"; } return; } The Exciting World of JavaScript

  10. Adding JavaScript Code to Your Frame Set (cont.) • No. 3: The number is taken from this code, which then passes the name of the requested graphic file to the function. <TR><TD><A HREF="javascript:setImage(1)">1: LIONS.GIF</A></TD></TR> <TR><TD><A HREF="javascript:setImage(2)">2: TIGERS.GIF</A></TD></TR> <TR><TD><A HREF="javascript:setImage(3)">3: BEARS.GIF</A></TD></TR> <TR><TD><A HREF="javascript:setImage(4)">4: OHMY.GIF</A></TD></TR> The Exciting World of JavaScript

  11. Adding JavaScript Code to Your Frame Set (cont.) • Display the js-test18.html file, which displays two other files. upper1.html lower2.html The Exciting World of JavaScript

  12. Creating a Frame-Based Slide Show • No. 1: Change the name of the lower frame file. <HTML> <HEAD> <TITLE>HTML and JavaScript</TITLE> </HEAD> <FRAMESET ROWS="140,*"> <FRAME NAME="upperFrame" SRC="upper1.html"> <FRAME NAME="lowerFrame" SRC="lower3.html"> </FRAMESET> </HTML> The Exciting World of JavaScript

  13. Creating a Frame-Based Slide Show (cont.) • No. 2: Save a new lower3.html file with new INPUT buttons. <CENTER> <H2>WELCOME</H2> <H3>to my</H3> <H3>Electronic Slideshow</H3> <BR> <INPUT TYPE="BUTTON" VALUE="Prev Image"> <INPUT TYPE="BUTTON" VALUE="Next Image"> </CENTER> The Exciting World of JavaScript

  14. Creating a Frame-Based Slide Show (cont.) • Display the js-test18.html file, which displays two different files. upper1.html lower3.html The Exciting World of JavaScript

  15. Making Your Slide Show Buttons Functional • No. 1: Change the name of the lower frame file. <HTML> <HEAD> <TITLE>HTML and JavaScript</TITLE> </HEAD> <FRAMESET ROWS="140,*"> <FRAME NAME="upperFrame" SRC="upper2.html"> <FRAME NAME="lowerFrame" SRC="lower4.html"> </FRAMESET> </HTML> The Exciting World of JavaScript

  16. Making Your Slide Show Buttons Functional (cont.) • No. 2: Add the JavaScript image array to the new upper2.html. var images= new Array(4); images[0] = new Image; images[0].src = "lions.gif"; images[1] = new Image; images[1].src = "tigers.gif"; images[2] = new Image; images[2].src = "bears.gif"; images[3] = new Image; images[3].src = "ohmy.gif"; var index=0; The Exciting World of JavaScript

  17. Making Your Slide Show Buttons Functional (cont.) • No. 3: Add the prevImage() function to upper2.html. function prevImage() { if (index > 0) { index--; document.upperImage.src=images[index].src; } return; } The Exciting World of JavaScript

  18. Making Your Slide Show Buttons Functional (cont.) • No. 4: Add the nextImage() function to upper2.html. function nextImage() { if (index <3) { index++; document.upperImage.src=images[index].src; } return; } The Exciting World of JavaScript

  19. Making Your Slide Show Buttons Functional (cont.) • No. 5: Rewrite lower4.html with these tags. <INPUT TYPE="BUTTON" VALUE="Prev Image" onClick="parent.upperFrame.prevImage()"> <INPUT TYPE="BUTTON" VALUE="Next Image" onClick="parent.upperFrame.nextImage()"> The Exciting World of JavaScript

  20. Making Your Slide Show Buttons Functional (cont.) • Display the js-test19.html file, which displays two changed files. upper2.html lower4.html The Exciting World of JavaScript

  21. Creating a Top-Level JavaScript Function • No. 1: Add code to the parent file. <HTML> <HEAD> <TITLE>HTML and JavaScript</TITLE> <SCRIPT> function message() { alert("We're off to see the Wizard!"); return; } </SCRIPT> The Exciting World of JavaScript

  22. Creating a Top-Level JavaScript Function (cont.) • No. 2: Change the names to the child files. <FRAMESET ROWS="140,*"> <FRAME NAME="upperFrame" SRC="upper3.html"> <FRAME NAME="lowerFrame" SRC="lower5.html"> </FRAMESET> </HTML> The Exciting World of JavaScript

  23. Creating a Top-Level JavaScript Function (cont.) • No. 3: Convert the image hyperlink in the new upper3html. <CENTER> <A HREF="javascript:top.message()"><IMG NAME="upperImage" SRC="lions.gif"></A> </CENTER> The Exciting World of JavaScript

  24. Creating a Top-Level JavaScript Function (cont.) • No. 4: Add the new button to the new lower5.html. <BR><BR> <INPUT TYPE="BUTTON" VALUE="Show Message" onClick="top.message()"> The Exciting World of JavaScript

  25. Creating a Top-Level JavaScript Function (cont.) • Display the js-test20.html file, which displays two altered files. upper3.html lower5.html The Exciting World of JavaScript

  26. Summary • You can create a JavaScript function with a parameter list. • You can create JavaScript-enabled hyperlinks that affect other frames. • You can create JavaScript-enabled buttons that affect other frames. • You can create top-level JavaScript functions. The Exciting World of JavaScript

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