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<!DOCTYPE html>
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< html lang = "en" >
< head >
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< meta charset = "utf-8" >
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< title > jQuery UI Draggable - Constrain movement< / title >
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< link rel = "stylesheet" href = "../../themes/base/jquery.ui.all.css" >
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< script src = "../../jquery-1.7.1.js" > < / script >
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< script src = "../../ui/jquery.ui.core.js" > < / script >
< script src = "../../ui/jquery.ui.widget.js" > < / script >
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< script src = "../../ui/jquery.ui.interaction.js" > < / script >
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< script src = "../../ui/jquery.ui.draggable.js" > < / script >
< link rel = "stylesheet" href = "../demos.css" >
< style >
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.draggable { width: 90px; height: 90px; padding: 0.5em; float: left; margin: 0 10px 10px 0; }
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#draggable, #draggable2 { margin-bottom:20px; }
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#draggable { cursor: n-resize; }
#draggable2 { cursor: e-resize; }
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#containment-wrapper { width: 95%; height:150px; border:2px solid #ccc; padding: 10px; }
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< / style >
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< script >
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$.ui.draggable.prototype.options.axis = null;
$( document ).bind( "dragstart", function( event, ui ) {
var axis,
draggable = $( event.target ).data( "draggable" );
if ( !draggable || !draggable.options.axis ) {
return;
}
axis = draggable.options.axis;
function drag( event, ui ) {
if ( axis === "x" ) {
ui.position.top = ui.startPosition.top;
} else {
ui.position.left = ui.startPosition.left;
}
}
draggable.element
.bind( "drag", drag )
.one( "dragstop", function() {
draggable.element.unbind( "drag", drag );
});
});
$.ui.draggable.prototype.options.containment = null;
$.ui.draggable.prototype._getContainment = function() {
return this.options.containment === "parent" ?
this.element.parent() :
$( this.options.containment );
};
$( document ).bind( "dragstart", function( event, ui ) {
var elem, container, offset, left, top, right, bottom,
draggable = $( event.target ).data( "draggable" );
if ( !draggable || !draggable.options.containment ) {
return;
}
elem = ui.helper || draggable.element;
container = draggable._getContainment();
offset = container.offset();
left = offset.left +
(parseFloat( $.curCSS( container[0], "borderLeftWidth", true ) ) || 0) +
(parseFloat( $.curCSS( container[0], "paddingLeft", true ) ) || 0);
top = offset.top +
(parseFloat( $.curCSS( container[0], "borderTopWidth", true ) ) || 0) +
(parseFloat( $.curCSS( container[0], "paddingTop", true ) ) || 0);
right = left + container.width();
bottom = top + container.height();
function drag( event, ui ) {
var leftDiff = ui.startOffset.left + ui.startPosition.left,
topDiff = ui.startOffset.top + ui.startPosition.top;
ui.position.left = Math.max( ui.position.left, left - leftDiff );
ui.position.left = Math.min( ui.position.left,
right - elem.outerWidth() - leftDiff );
ui.position.top = Math.max( ui.position.top, top - topDiff );
ui.position.top = Math.min( ui.position.top,
bottom - elem.outerHeight() - topDiff );
}
draggable.element
.bind( "drag", drag )
.one( "dragstop", function() {
draggable.element.unbind( "drag", drag );
});
});
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$(function() {
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$( "#draggable" ).draggable({ axis: "y" });
$( "#draggable2" ).draggable({ axis: "x" });
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$( "#draggable3" ).draggable({ containment: "#containment-wrapper" });
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$( "#draggable4" ).draggable({ containment: "#demo-frame" });
$( "#draggable5" ).draggable({ containment: "parent" });
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});
< / script >
< / head >
< body >
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< div class = "demo" >
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< h3 class = "docs" > Constrain movement along an axis:< / h3 >
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< div id = "draggable" class = "draggable ui-widget-content" >
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< p > I can be dragged only vertically< / p >
< / div >
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< div id = "draggable2" class = "draggable ui-widget-content" >
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< p > I can be dragged only horizontally< / p >
< / div >
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< h3 class = "docs" > Or to within another DOM element:< / h3 >
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< div id = "containment-wrapper" >
< div id = "draggable3" class = "draggable ui-widget-content" >
< p > I'm contained within the box< / p >
< / div >
< div id = "draggable4" class = "draggable ui-widget-content" >
< p > I'm contained within the box's parent< / p >
< / div >
< div class = "draggable ui-widget-content" >
< p id = "draggable5" class = "ui-widget-header" > I'm contained within my parent< / p >
< / div >
< / div >
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< / div > <!-- End demo -->
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< div class = "demo-description" >
< p > Constrain the movement of each draggable by defining the boundaries of the draggable area. Set the < code > axis< / code > option to limit the draggable's path to the x- or y-axis, or use the < code > containment< / code > option to specify a parent DOM element or a jQuery selector, like 'document.'< / p >
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< / div > <!-- End demo - description -->
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< / body >
< / html >
