【图】jcrop 网页截图工具(插件)开发

今天给大家介绍一下一个web 中经常会用到的截图(如：头像等)工具：

Jcrop演示

项目结构：

效果图：

这个很有用：

看到这些，大家也想自己试试吧

===========================================

代码部分：

===========================================

准备工作：

下载：Jcrop-0.9.10 (zip format)

解压后放入到你的项目里面，就如上面的项目结构一样...

/Jcrop/WebContent/tapmodo-Jcrop/demos/tutorial1.html

 代码如下：
 
!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd" 
html xmlns="http://www.w3.org/1999/xhtml" 
head 
meta http-equiv="Content-type" content="text/html;charset=UTF-8" / 
titleJcrop » Tutorials » aspectRatio w/ Preview/title 
script src="../js/jquery.min.js" type="text/javascript"/script 
script src="../js/jquery.Jcrop.js" type="text/javascript"/script 
link rel="stylesheet" href="../css/jquery.Jcrop.css" type="text/css" / 
link rel="stylesheet" href="demo_files/demos.css" type="text/css" / 
script type="text/javascript" 
jQuery(function($) { 
// Create variables (in this scope) to hold the API and image size 
var jcrop_api, boundx, boundy; 
$('#target').Jcrop({ 
onChange : updatePreview, 
onSelect : updatePreview, 
aspectRatio : 1 
}, function() { 
// Use the API to get the real image size 
var bounds = this.getBounds(); 
boundx = bounds[0]; 
boundy = bounds[1]; 
// Store the API in the jcrop_api variable 
jcrop_api = this; 
}); 
function updatePreview(c) { 
if (parseInt(c.w)  0) { 
var rx = 100 / c.w; 
var ry = 100 / c.h; 
$('#preview').css({ 
width : Math.round(rx * boundx) + 'px', 
height : Math.round(ry * boundy) + 'px', 
marginLeft : '-' + Math.round(rx * c.x) + 'px', 
marginTop : '-' + Math.round(ry * c.y) + 'px' 
}); 
} 
} 

}); 
/script 
/head 
body 
div id="outer" 
div class="jcExample" 
div class="article" 
h1Jcrop - Aspect ratio w/ preview pane/h1 
table 
tr 
td 
div style="width: 500px; height: 370px; overflow: hidden;" 
img src="demo_files/pool.jpg" id="target" alt="" style="width: 500px; height: 370px;"/ 
/div 
/td 
td 
div style="width: 100px; height: 100px; overflow: hidden;" 
img src="demo_files/pool.jpg" id="preview" alt="" class="jcrop-preview" / 
/div 
/td 
/tr 
/table 
p 
bAn example implementing a preview pane./b Obviously the most visual demo, the preview pane is accomplished entirely outside of Jcrop with a simple jQuery-flavored callback. This type of interface could be useful for creating a thumbnail or avatar. The onChange event handler is used to update the view in the preview pane. 
/p 
div id="dl_links" 
a href="http://deepliquid.com/content/Jcrop.html"Jcrop Home/a | a href="http://deepliquid.com/content/Jcrop_Manual.html"Manual (Docs)/a 
/div 
/div 
/div 
/div 
/body 
/html 

/Jcrop/WebContent/tapmodo-Jcrop/demos/tutorial4.html

代码如下：

!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"
html xmlns="http://www.w3.org/1999/xhtml"
head
meta http-equiv="Content-type" content="text/html;charset=UTF-8" /
titleJcrop » Tutorials » Animations / Transitions/title
script src="../js/jquery.min.js" type="text/javascript"/script
script src="../js/jquery.Jcrop.js" type="text/javascript"/script
script src="../js/jquery.color.js" type="text/javascript"/script
link rel="stylesheet" href="../css/jquery.Jcrop.css" type="text/css" /
link rel="stylesheet" href="../css/jquery.Jcrop.extras.css" type="text/css" /
link rel="stylesheet" href="demo_files/demos.css" type="text/css" /
script type="text/javascript"
jQuery(function($){
var jcrop_api;
$('#target').Jcrop({
bgFade: true,
bgOpacity: .3,
setSelect: [ 60, 70, 540, 330 ]
},function(){
jcrop_api = this;
});
$('#fadetog').change(function(){
jcrop_api.setOptions({
bgFade: this.checked
});
}).attr('checked','checked');
$('#shadetog').change(function(){
if (this.checked) $('#shadetxt').slideDown();
else $('#shadetxt').slideUp();
jcrop_api.setOptions({
shade: this.checked
});
}).attr('checked',false);
// Define page sections
var sections = {
anim_buttons: 'Animate Selection',
bgo_buttons: 'Change bgOpacity',
bgc_buttons: 'Change bgColor'
};
// Define animation buttons
var ac = {
anim1: [217,122,382,284],
anim2: [20,20,580,380],
anim3: [24,24,176,376],
anim4: [347,165,550,355],
anim5: [136,55,472,183]
};
// Define bgOpacity buttons
var bgo = {
Low: .2,
Mid: .5,
High: .8,
Full: 1
};
// Define bgColor buttons
var bgc = {
Red: '#900',
Blue: '#4BB6F0',
Yellow: '#F0B207',
Green: '#46B81C',
White: 'white',
Black: 'black'
};
// Create fieldset targets for buttons
for(i in sections)
insertSection(i,sections[i]);
// Create animation buttons
for(i in ac) {
$('#anim_buttons').append(
$('button /').append(i).click(animHandler(ac[i])), ' '
);
}
// Create bgOpacity buttons
for(i in bgo) {
$('#bgo_buttons').append(
$('button /').append(i).click(setoptHandler('bgOpacity',bgo[i])), ' '
);
}
// Create bgColor buttons
for(i in bgc) {
$('#bgc_buttons').append(
$('button /').append(i).css({
backgroundColor: bgc[i],
color: ((i == 'Black') || (i == 'Red'))?'white':'black'
}).click(setoptHandler('bgColor',bgc[i])), ' '
);
}
// Function to insert named sections into interface
function insertSection(k,v) {
$('#interface').append(
$('fieldset/fieldset').attr('id',k).append(
$('legend/legend').append(v)
)
);
};
// Handler for option-setting buttons
function setoptHandler(k,v) {
return function() {
var opt = { };
opt[k] = v;
jcrop_api.setOptions(opt);
return false;
};
};
// Handler for animation buttons
function animHandler(v) {
return function() {
jcrop_api.animateTo(v);
return false;
};
};
$('#anim_buttons').append(
$('button/button').append('Bye!').click(function(){
jcrop_api.animateTo(
[300,200,300,200],
function(){ this.release(); }
);
return false;
})
);
$('#interface').show();
});
/script
/head
body
div id="outer"
div class="jcExample"
div class="article"
h1Jcrop - Animations/Transitions/h1
img src="demo_files/sago.jpg" id="target" alt="" /
div id="interface" style="margin: 1em 0;"/div
divlabelinput type="checkbox" id="fadetog" / Enable fading (bgFade: true)/label/div
divlabelinput type="checkbox" id="shadetog" / Use experimental shader (shade: true)/label/div
p id="shadetxt" style="display:none; color:#900;"
bExperimental shader active./b
Jcrop now includes a shading mode that facilitates building
better transparent Jcrop instances. The experimental shader is less
robust than Jcrop's default shading method and should only be
used if you require this functionality.
/p
p
bAnimation/Transitions./b
Demonstration of animateTo API method and transitions for bgColor
and bgOpacity options. Color fading requires inclusion of John Resig's
jQuery a href="http://plugins.jquery.com/project/color"Color
Animations/a plugin. If it is not included, colors will not fade.
/p
div id="dl_links"
a href="http://deepliquid.com/content/Jcrop.html"Jcrop Home/a |
a href="http://deepliquid.com/content/Jcrop_Manual.html"Manual (Docs)/a
/div
/div
/div
/div
/body
/html

/Jcrop/WebContent/tapmodo-Jcrop/demos/tutorial5.html代码如下：

!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"
html xmlns="http://www.w3.org/1999/xhtml"
head
meta http-equiv="Content-type" content="text/html;charset=UTF-8" /
titleJcrop » Tutorials » API Demo/title
script src="../js/jquery.min.js" type="text/javascript"/script
script src="../js/jquery.Jcrop.js" type="text/javascript"/script
link rel="stylesheet" href="../css/jquery.Jcrop.css" type="text/css" /
link rel="stylesheet" href="demo_files/demos.css" type="text/css" /
style type="text/css"
.optdual { position: relative; }
.optdual .offset { position: absolute; left: 18em; }
.optlist label { width: 16em; display: block; }
#dl_links { margin-top: .5em; }
/style
script type="text/javascript"
jQuery(function($){
// The variable jcrop_api will hold a reference to the
// Jcrop API once Jcrop is instantiated.
var jcrop_api;
// In this example, since Jcrop may be attached or detached
// at the whim of the user, I've wrapped the call into a function
initJcrop();
// The function is pretty simple
function initJcrop()//{{{
{
// Hide any interface elements that require Jcrop
// (This is for the local user interface portion.)
$('.requiresjcrop').hide();
// Invoke Jcrop in typical fashion
$('#target').Jcrop({
onRelease: releaseCheck
},function(){
jcrop_api = this;
jcrop_api.animateTo([100,100,400,300]);
// Setup and dipslay the interface for "enabled"
$('#can_click,#can_move,#can_size').attr('checked','checked');
$('#ar_lock,#size_lock,#bg_swap').attr('checked',false);
$('.requiresjcrop').show();
});
};
//}}}
// Use the API to find cropping dimensions
// Then generate a random selection
// This function is used by setSelect and animateTo buttons
// Mainly for demonstration purposes
function getRandom() {
var dim = jcrop_api.getBounds();
return [
Math.round(Math.random() * dim[0]),
Math.round(Math.random() * dim[1]),
Math.round(Math.random() * dim[0]),
Math.round(Math.random() * dim[1])
];
};
// This function is bound to the onRelease handler...
// In certain circumstances (such as if you set minSize
// and aspectRatio together), you can inadvertently lose
// the selection. This callback re-enables creating selections
// in such a case. Although the need to do this is based on a
// buggy behavior, it's recommended that you in some way trap
// the onRelease callback if you use allowSelect: false
function releaseCheck()
{
jcrop_api.setOptions({ allowSelect: true });
$('#can_click').attr('checked',false);
};
// Attach interface buttons
// This may appear to be a lot of code but it's simple stuff
$('#setSelect').click(function(e) {
// Sets a random selection
jcrop_api.setSelect(getRandom());
});
$('#animateTo').click(function(e) {
// Animates to a random selection
jcrop_api.animateTo(getRandom());
});
$('#release').click(function(e) {
// Release method clears the selection
jcrop_api.release();
});
$('#disable').click(function(e) {
// Disable Jcrop instance
jcrop_api.disable();
// Update the interface to reflect disabled state
$('#enable').show();
$('.requiresjcrop').hide();
});
$('#enable').click(function(e) {
// Re-enable Jcrop instance
jcrop_api.enable();
// Update the interface to reflect enabled state
$('#enable').hide();
$('.requiresjcrop').show();
});
$('#rehook').click(function(e) {
// This button is visible when Jcrop has been destroyed
// It performs the re-attachment and updates the UI
$('#rehook,#enable').hide();
initJcrop();
$('#unhook,.requiresjcrop').show();
return false;
});
$('#unhook').click(function(e) {
// Destroy Jcrop widget, restore original state
jcrop_api.destroy();
// Update the interface to reflect un-attached state
$('#unhook,#enable,.requiresjcrop').hide();
$('#rehook').show();
return false;
});
// Hook up the three image-swapping buttons
$('#img1').click(function(e) {
jcrop_api.setImage('demo_files/sago.jpg');
jcrop_api.setOptions({ bgOpacity: .6 });
return false;
});
$('#img2').click(function(e) {
jcrop_api.setImage('demo_files/pool.jpg');
jcrop_api.setOptions({ bgOpacity: .6 });
return false;
});
$('#img3').click(function(e) {
jcrop_api.setImage('demo_files/sago.jpg',function(){
this.setOptions({
bgOpacity: 1,
outerImage: 'demo_files/sagomod.jpg'
});
this.animateTo(getRandom());
});
return false;
});
// The checkboxes simply set options based on it's checked value
// Options are changed by passing a new options object
// Also, to prevent strange behavior, they are initially checked
// This matches the default initial state of Jcrop
$('#can_click').change(function(e) {
jcrop_api.setOptions({ allowSelect: !!this.checked });
jcrop_api.focus();
});
$('#can_move').change(function(e) {
jcrop_api.setOptions({ allowMove: !!this.checked });
jcrop_api.focus();
});
$('#can_size').change(function(e) {
jcrop_api.setOptions({ allowResize: !!this.checked });
jcrop_api.focus();
});
$('#ar_lock').change(function(e) {
jcrop_api.setOptions(this.checked?
{ aspectRatio: 4/3 }: { aspectRatio: 0 });
jcrop_api.focus();
});
$('#size_lock').change(function(e) {
jcrop_api.setOptions(this.checked? {
minSize: [ 80, 80 ],
maxSize: [ 350, 350 ]
}: {
minSize: [ 0, 0 ],
maxSize: [ 0, 0 ]
});
jcrop_api.focus();
});
});
/script
/head
body
div id="outer"
div class="jcExample"
div class="article"
h1Jcrop - API Demo/h1
img src="demo_files/sago.jpg" id="target" alt="" /
div style="margin: .8em 0 .5em;"
span class="requiresjcrop"
button id="setSelect"setSelect/button
button id="animateTo"animateTo/button
button id="release"Release/button
button id="disable"Disable/button
/span
button id="enable" style="display:none;"Re-Enable/button
button id="unhook"Destroy!/button
button id="rehook" style="display:none;"Attach Jcrop/button
/div
fieldset class="optdual requiresjcrop"
legendOption Toggles/legend
div class="optlist offset"
labelinput type="checkbox" id="ar_lock" /Aspect ratio/label
labelinput type="checkbox" id="size_lock" /minSize/maxSize setting/label
/div
div class="optlist"
labelinput type="checkbox" id="can_click" /Allow new selections/label
labelinput type="checkbox" id="can_move" /Selection can be moved/label
labelinput type="checkbox" id="can_size" /Resizable selection/label
/div
/fieldset
fieldset class="requiresjcrop" style="margin: .5em 0;"
legendChange Image/legend
span
button id="img2"Pool/button
button id="img1"Sago/button
button id="img3"Sago w/ outerImage/button
/span
/fieldset
div id="dl_links"
a href="http://deepliquid.com/content/Jcrop.html"Jcrop Home/a |
a href="http://deepliquid.com/content/Jcrop_Manual.html"Manual (Docs)/a
/div
/div
/div
/div
/body
/html