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Introducing HTML5
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var drop = documentgetElementById("dropzone"); dropaddEventListener("dragenter",dragenter,false); dropaddEventListener("dragleave",dragleave,false); dropaddEventListener("dragover",dragover,false); dropaddEventListener("drop",drops,false);
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PART I
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Each of these events contains a new event property called dataTransfer This property is used to customize the drag and drop and to pass data from the drag element to the drop element It supports the following properties itself: dropEffect Indicates the type of drag and drop expected for the drop zone If it does not match the effectAllowed set in the drag element, then the drop will be canceled The options are none, copy, link, and move; for example:
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edataTransferdropEffect = "copy";
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effectAllowed Indicates the types of drag and drop that the dragging element will allow If it does not match the dropEffect in the drop zone, then the drop will be canceled The options are none, copy, copyLink, copyMove, link, linkMove, move, all, and uninitialized; for example:
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edataTransfereffectAllowed = "move";
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types Presents a list of content types that the draggable data contains:
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if (edataTransfertypescontains("text/html")){ //do something; }
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clearData() Resets the data in the drag element
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edataTransferclearData();
setData(format,data) Sets data to be sent to the drop zone The format field expects a string to indicate the format of the data being passed
edataTransfersetData("text/plain","Simple String"); edataTransfersetData("text/html","<strong>HTML String</strong>");
getData(format) Fetches the data set by the drag item Only returns the data that matches the format type
edataTransfergetData("text/html"); //returns <strong>HTML String</ strong>
setDragImage(element,x,y) When an item is being dragged, it is possible for the drag shadow to be set to any element It can be an element on the page, an image, a newly created element, or even a canvas drawing The x,y coordinates indicate where the mouse should attach to the shadow
edataTransfersetDragImage(documentgetElementById("shadowimage",10, 10));
With the methods and properties exposed in the dataTransfer property, the drag and drop is quite powerful One exceptional feature is the ability to drag anything into a drop zone and retrieve the content via getData() This includes URLs from the address bar, HTML from other pages, and text from Notepad documents
Part I:
Core Markup
A simple example using a few of the drag and drop API properties and methods can be found online at the book support site
O NLINE http://htmlrefcom/ch2/draggablehtml
contenteditable Attribute
First introduced by Internet Explorer, the proprietary contenteditable attribute is supported by most browsers today HTML5 standardizes the use of this attribute globally on all elements The basic sense of the attribute is that if you set it to true, the browser should allow you to modify the text directly when you click the element:
<p contenteditable="true">This paragraph of text is editable Click it and you will see Of course there is no sense of saving it with code to transmit the information to the server This paragraph of text is editable Click it and you will see Of course there is no sense of saving it with code to transmit the information to the server</p>
The browser may or may not present a style change to show you are in edit mode
Style change upon edit
versus
No style change upon edit
contentEditable property for the element For example, the following changes this property and updates the class name to reflect a style change when in edit mode
<p ondblclick="thiscontentEditable=true;thisclassName='inEdit';" onblur="thiscontentEditable=false;thisclassName='';">This paragraph uses some simple script to be editable Double-click the text to begin editing</p>
It is possible to use JavaScript to enable content editing by changing the corresponding
2:
Introducing HTML5
O NLINE http://htmlrefcom/ch2/contenteditablehtml NOTE Without sending the modified content to the server, any text changed when in edit mode will
be lost when the page is exited
PART I
spellcheck Attribute
HTML5 defines a spellcheck attribute globally for elements Interestingly, some browsers such as Firefox have supported spell checking of form fields and elements in content editing mode using the contenteditable attribute for some time HTML5 makes this attribute standard Enabling the spell checking of element content is a matter of setting the spellcheck attribute to true:
<p spellcheck="true">Spellcheck on: There is a tyyypooo here Did the browser spot it </p>
Testing in supporting browsers shows that indication on content editable regions appears when there is a spelling error However, there is unclarity in the specification whether the user must be in edit mode before the indication should be displayed
Commonly, this attribute is a bit more useful on form fields, given their interactive nature:
<label>Text field: (spellcheck on) <input type="text" name="textfield" spellcheck="true" value="There is a tyyypoo here Did the browser spot it "></label>
Given the application of single-line text fields, it is far more useful to set this attribute on multiline text fields defined by a <textarea> tag, like so:
<label>Text area: (spellcheck on) <textarea name="comments" spellcheck="true">There is a tyyypooo here Did the browser spot it </textarea></label>
O NLINE http://htmlrefcom/ch2/spellcheckhtml NOTE Some browsers may invoke spell checking on elements particularly the textarea
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