link document.getelementbyid("coffee").style.borderwidth = "0px" document.getelementbyid("tea").style.borderwidth = "10px"
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- Winfred Gregory
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2 <!DOCTYPE html><html><head> <script> function coffeeinfo() document.getelementbyid('p3').innerhtml = "<p>the word 'coffee' was at one time a term for wine, but was. </p>" document.getelementbyid('p3').style.color = "#CCBBAA" document.getelementbyid('p3').style.backgroundcolor = "# document.getelementbyid("p3").style.bordercolor = "#3399BB" document.getelementbyid("coffee").style.bordercolor = "#3399BB document.getelementbyid("coffee").style.borderwidth = "10px" document.getelementbyid("tea").style.borderwidth = "0px" function teainfo() document.getelementbyid('p3').innerhtml = "<p>the origin of tea can be traced back to the year 2737 BC... </p>" document.getelementbyid('p3').style.color = "#227700" document.getelementbyid('p3').style.backgroundcolor = "#BBCC22 document.getelementbyid("p3").style.bordercolor = "#114400" document.getelementbyid("tea").style.bordercolor = "# document.getelementbyid("tea").style.borderwidth = "10px" document.getelementbyid("coffee").style.borderwidth = "0px" <table ><tr><td ><img src = "Images/coffee.jpg" width = "300" height = "280" alt = "pic of coffee" id = "coffee"> </td><td><img src = "Images/tea.jpg" width = "360" height = "280" alt = "pic of tea" id = "tea"> </td></tr> <tr><td> <input type = "button" value = "Learn more about coffee" onclick = "coffeeinfo()"> </td><td> <input type = "button" value = "Learn more about tea" onclick = "teainfo()"> </td></tr> <tr><td colspan = "2" id = "p3"> </td></tr> </table>
3 Calling Functions (making them happen) There are a number of ways you can make a function happen in JavaScript You ve seen onclick= functionname() There s also: onmouseover= when you run your mouse over something onmouseout when you take your mouse pointer off of something onload for when the web page loads Also have: ondblclick when you double-click on something onfocus when you put your cursor into a form element like a textbox onblur when your cursor leaves a form element onkeydown when you press a key down over something onkeyup when you release a key over something onkeypress- when you press and release a key over something onmousedown- when you click the mouse over something (but don t release it) onmouseup when you release the mouse over something onmousemove- moving the mouse while hovering over something onsubmit when submitting a form onunload when you leave the current web page window you re in.
4 onmouseover, onmouseout <!DOCTYPE html><html> <head> <script> function changepara() document.getelementbyid('firstp').innerhtml = "GET YOUR MOUSE OFF THAT BUTTON!" function changethanks() document.getelementbyid('firstp').innerhtml = "Whew, that was close!" <p id = "firstp">this is a very important paragraph!!!</p> <input type = "button" value = "Don't click here" onmouseover = "changepara()" onmouseout = "changethanks()">
5 onmouseover,onmouseout <!DOCTYPE html><html><head> <script> function changepara() document.getelementbyid('firstp').innerhtml = "DON'T RUN YOUR MOUSE OVER THIS PARAGRAPH!" function changethanks() document.getelementbyid('firstp').innerhtml = "Thank you for taking your mouse off this paragraph" <p id = "firstp" onmouseover = "changepara()" onmouseout = "changethanks()"> This is a very important paragraph!!!</p>
6 images <!DOCTYPE html><html><head> <script> function changepic() document.getelementbyid('pic1').src = "Images/ghost.jpg" function changeback() document.getelementbyid('pic1').src = "Images/woman.jpg" <p><img src = "Images/woman.jpg" width = "300" height = "300" id = "pic1" onmouseover = "changepic()" onmouseout = "changeback()"> </p>
7 Using an array of images: <!DOCTYPE html><html><head> picarray[0]= "Images/safari1.jpg" picarray[4]="images/safari5.jpg function displaypic() var num = Math.floor(Math.random()*5) <p><img src = "Images/Leopard.jpg" height = "300" width = "390" alt = "vacation pics" id = "pic1" > </p> <input type = "button" value = "Click here for more vacation pics" onclick = "displaypic()">
8 How would we add a picture? First, we need to know the length of the array we add elements to the end of the array, so we have to know how many elements are already in the array. Every time we add a picture to the array, we change the length of the array. So we can t always know the exact number ahead of time JavaScript has a built in function that tells us the length (the number of elements) in any array: E.g., var myarray = new Array() myarray[0]= "Images/safari1.jpg myarray[1]="images/safari2.png myarray[2]="images/safari3.jpg var num = myarray.length Num now holds 3 (there are 3 elements in myarray
9 Now let s write a function that adds a picture to the array: <!DOCTYPE html><html><head> picarray[0]= "Images/safari1.jpg" picarray[4]="images/safari5.jpg function addpic() var newpic = prompt("enter new picture") var num = picarray.length picarray[num] = newpic <p><img src = "Images/Leopard.jpg" height = "300" width = "390" alt = "vacation pics" id = "pic1" > </p> <input type = "button" value = "Click here to add a pic" onclick = "addpic()">
10 Put it together <!DOCTYPE html><html><head> picarray[0]="images/safari1.jpg" picarray[4]="images/safari5.jpg function addpic() var newpic = prompt("enter new picture") var num = picarray.length picarray[num] = newpic function displaypic() var num = Math.floor(Math.random()*5) <p><img src = "Images/Leopard.jpg" height = "300" width = "390" alt = "vacation pics" id = "pic1" > </p> <input type = "button" value = "Click here for more vacation pics" onclick = "displaypic()"> <input type = "button" value = "Click here to add a pic" onclick = "addpic()"> Once we ve added the new pic, can we now see it when we click on the first button (that calls displaypic)?
11 Put it together <!DOCTYPE html><html><head> picarray[0]="images/safari1.jpg" picarray[4]="images/safari5.jpg function addpic() var newpic = prompt("enter new picture") var num = picarray.length picarray[num] = newpic function displaypic() var num = Math.floor(Math.random()*picArray.length) <p><img src = "Images/Leopard.jpg" height = "300" width = "390" alt = "vacation pics" id = "pic1" > </p> <input type = "button" value = "Click here for more vacation pics" onclick = "displaypic()"> <input type = "button" value = "Click here to add a pic" onclick = "addpic()"> Once we ve added the new pic, can we now see it when we click on the first button (that calls displaypic)?
12 What if we want to see our vacation pics in order? <!DOCTYPE html><html><head> picarray[0]="images/safari1.jpg" picarray[4]="images/safari5.jpg" var num = 0 /* do we need to change this?*/ function displaypic() num = num + 1 <p><img src = "Images/Leopard.jpg" height = "300" width = "390" alt = "vacation pics" id = "pic1" > </p> <input type = "button" value = "Click here for more vacation pics" onclick = "displaypic()">
13 Going back to the beginning <!DOCTYPE html><html><head> picarray[0]="images/safari1.jpg" picarray[4]="images/safari5.jpg" var num = -1 function displaypic() num = num + 1 if (num >= picarray.length) num = 0 <p><img src = "Images/Leopard.jpg" height = "300" width = "390" alt = "vacation pics" id = "pic1" > </p> <input type = "button" value = "Click here for more vacation pics" onclick = "displaypic()">
14 <!DOCTYPE html><html><head> picarray[0]="images/safari1.jpg" picarray[4]="images/safari5.jpg" What if we add pictures? var num = -1 function displaypic() num = num + 1 if (num >= picarray.length) num = 0 function addpic() var newpic = prompt("enter new picture") var num = picarray.length picarray[num] = newpic <p><img src = "Images/Leopard.jpg" height = "300" width = "390" alt = "vacation pics" id = "pic1" > </p> <input type = "button" value = "Click here for more vacation pics" onclick = "displaypic()"> <input type = "button" value = "Click here to add a pic" onclick = "addpic()">
15 <!DOCTYPE html><html><head> picarray[0]="images/safari1.jpg" picarray[4]="images/safari5.jpg" var num = -1 function displaypic() num = num + 1 if (num >= picarray.length) num = 0 document.getelementbyid("p1").innerhtml = num function displaybak() num = num - 1 if (num < 0) num = picarray.length-1 document.getelementbyid("p1").innerhtml = num function addpic() var newpic = prompt("enter new picture") var num = picarray.length picarray[num] = newpic Going Backwards? <p><img src = "Images/Leopard.jpg" height = "300" width = "390" alt = "vacation pics" id = "pic1" > </p> <input type = "button" value = "Go Forward" onclick = "displaypic()"> <input type = "button" value = "Go Back" onclick = "displaybak()"> <input type = "button" value = "Click here to add a pic" onclick = "addpic()"> <p id = "p1">image number </p>
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