phpThumb

澳洲大头

phpThumb, an image processing script, has been installed today. It allows us to reduce image size before sent to browser. This significantly reduce page loading time as smaller image is transfered when no big image is needed. the script also cache the processed files, imptoving the speed enven further.

The first application of this function is the conveyer belt image show on top of the home page. All images were downloaded in full size but reduced at the browser end wasting bandwidth. Now the images are resized before sent to the browser.


Here is the conveyer belt code:

1. 
   
2. <script type="text/javascript">
   
3. /***********************************************
   
4. * Conveyor belt slideshow script- © Dynamic Drive DHTML code library (www.dynamicdrive.com)
   
5. * This notice MUST stay intact for legal use
   
6. * Visit Dynamic Drive at http://www.dynamicdrive.com/ for full source code
   
7. ***********************************************/
   
8. 
   
9. //Specify the slider's width (in pixels)
   
10. var sliderwidth="1064px"
    
11. //Specify the slider's height
    
12. var sliderheight="90px"
    
13. //Specify the slider's slide speed (larger is faster 1-10)
    
14. var slidespeed=1
    
15. //configure background color:
    
16. slidebgcolor="#1E4B7E"
    
17. //Specify the slider's images
    
18. var leftrightslide=new Array()
    
19. var finalslide=''
    
20. [node]
    
21. leftrightslide[{order}-1]='<a href={link} target=_blank> <img src=../phpthumb/phpThumb.php?src=../discuz/{imgfile}&h=80&fltr[]=usm|80|0.5|3 border=1 title="{subject} - {author}">     </a>'
    
22. [/node]
    
23. 
    
24. //Specify gap between each image (use HTML):
    
25. var imagegap=" "
    
26. //Specify pixels gap between each slideshow rotation (use integer):
    
27. var slideshowgap=5
    
28. 
    
29. ////NO NEED TO EDIT BELOW THIS LINE////////////
    
30. var copyspeed=slidespeed
    
31. leftrightslide='<nobr>'+leftrightslide.join(imagegap)+'</nobr>'
    
32. var iedom=document.all||document.getElementById
    
33. if (iedom)
    
34. document.write('<span id="temp" style="visibility:hidden;position:absolute;top:-100px;left:-9000px">'+leftrightslide+'</span>')
    
35. var actualwidth=''
    
36. var cross_slide, ns_slide
    
37. function fillup(){
    
38. if (iedom){
    
39. cross_slide=document.getElementById? document.getElementById("test2") : document.all.test2
    
40. cross_slide2=document.getElementById? document.getElementById("test3") : document.all.test3
    
41. cross_slide.innerHTML=cross_slide2.innerHTML=leftrightslide
    
42. actualwidth=document.all? cross_slide.offsetWidth : document.getElementById("temp").offsetWidth
    
43. cross_slide2.style.left=actualwidth+slideshowgap+"px"
    
44. }
    
45. else if (document.layers){
    
46. ns_slide=document.ns_slidemenu.document.ns_slidemenu2
    
47. ns_slide2=document.ns_slidemenu.document.ns_slidemenu3
    
48. ns_slide.document.write(leftrightslide)
    
49. ns_slide.document.close()
    
50. actualwidth=ns_slide.document.width
    
51. ns_slide2.left=actualwidth+slideshowgap
    
52. ns_slide2.document.write(leftrightslide)
    
53. ns_slide2.document.close()
    
54. }
    
55. lefttime=setInterval("slideleft()",30)
    
56. }
    
57. window.onload=fillup
    
58. function slideleft(){
    
59. if (iedom){
    
60. if (parseInt(cross_slide.style.left)>(actualwidth*(-1)+8))
    
61. cross_slide.style.left=parseInt(cross_slide.style.left)-copyspeed+"px"
    
62. else
    
63. cross_slide.style.left=parseInt(cross_slide2.style.left)+actualwidth+slideshowgap+"px"
    
64. if (parseInt(cross_slide2.style.left)>(actualwidth*(-1)+8))
    
65. cross_slide2.style.left=parseInt(cross_slide2.style.left)-copyspeed+"px"
    
66. else
    
67. cross_slide2.style.left=parseInt(cross_slide.style.left)+actualwidth+slideshowgap+"px"
    
68. }
    
69. else if (document.layers){
    
70. if (ns_slide.left>(actualwidth*(-1)+8))
    
71. ns_slide.left-=copyspeed
    
72. else
    
73. ns_slide.left=ns_slide2.left+actualwidth+slideshowgap
    
74. if (ns_slide2.left>(actualwidth*(-1)+8))
    
75. ns_slide2.left-=copyspeed
    
76. else
    
77. ns_slide2.left=ns_slide.left+actualwidth+slideshowgap
    
78. }
    
79. }
    
80. 
    
81. if (iedom||document.layers){
    
82. with (document){
    
83. document.write('<table border="0" cellspacing="0" cellpadding="0"><td valign=middle>')
    
84. if (iedom){
    
85. write('<div style="position:relative;width:'+sliderwidth+';height:'+sliderheight+';overflow:hidden">')
    
86. write('<div style="position:absolute;width:'+sliderwidth+';height:'+sliderheight+';background-color:'+slidebgcolor+'" onMouseover="copyspeed=0" onMouseout="copyspeed=slidespeed">')
    
87. write('<div id="test2" style="position:absolute;left:0px;top:10px"></div>')
    
88. write('<div id="test3" style="position:absolute;left:-1000px;top:10px"></div>')
    
89. write('</div></div>')
    
90. }
    
91. else if (document.layers){
    
92. write('<ilayer width='+sliderwidth+' height='+sliderheight+' name="ns_slidemenu" bgColor='+slidebgcolor+'>')
    
93. write('<layer name="ns_slidemenu2" left=0 top=0 onMouseover="copyspeed=0" onMouseout="copyspeed=slidespeed"></layer>')
    
94. write('<layer name="ns_slidemenu3" left=0 top=0 onMouseover="copyspeed=0" onMouseout="copyspeed=slidespeed"></layer>')
    
95. write('</ilayer>')
    
96. }
    
97. document.write('</td></table>')
    
98. }
    
99. }
    
100. </script>
     

复制代码

In this code the image fetching part is changed from

1. [node]
   
2. leftrightslide[{order}-1]='<a href={link} target=_blank> <img height= 80 src={imgfile} border=1 title="{subject} - {author}"> </a>'
   
3. [/node]

复制代码

to

1. 
   
2. [node]
   
3. leftrightslide[{order}-1]='<a href={link} target=_blank> <img src=../phpthumb/phpThumb.php?src=../discuz/{imgfile}&h=80&fltr[]=usm|80|0.5|3 border=1 title="{subject} - {author}">     </a>'
   
4. [/node]
   

复制代码

Note, relative path is used here (it took a while to make this right).