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Gary Sharp
2013-02-01 12:35:28 +11:00
parent 543a005d31
commit 0a93429800
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Disco.Web/ClientSource/Scripts/Core/jquery.watermark.js
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/*
Watermark plugin for jQuery
Version: 3.1.4
http://jquery-watermark.googlecode.com/
Copyright (c) 2009-2012 Todd Northrop
http://www.speednet.biz/
August 13, 2012
Requires: jQuery 1.2.3+
Dual licensed under the MIT or GPL Version 2 licenses.
See mit-license.txt and gpl2-license.txt in the project root for details.
------------------------------------------------------*/
( function ( $, window, undefined ) {
var
// String constants for data names
dataFlag = "watermark",
dataClass = "watermarkClass",
dataFocus = "watermarkFocus",
dataFormSubmit = "watermarkSubmit",
dataMaxLen = "watermarkMaxLength",
dataPassword = "watermarkPassword",
dataText = "watermarkText",
// Copy of native jQuery regex use to strip return characters from element value
rreturn = /\r/g,
// Used to determine if type attribute of input element is a non-text type (invalid)
rInvalidType = /^(button|checkbox|hidden|image|radio|range|reset|submit)$/i,
// Includes only elements with watermark defined
selWatermarkDefined = "input:data(" + dataFlag + "),textarea:data(" + dataFlag + ")",
// Includes only elements capable of having watermark
selWatermarkAble = ":watermarkable",
// triggerFns:
// Array of function names to look for in the global namespace.
// Any such functions found will be hijacked to trigger a call to
// hideAll() any time they are called. The default value is the
// ASP.NET function that validates the controls on the page
// prior to a postback.
//
// Am I missing other important trigger function(s) to look for?
// Please leave me feedback:
// http://code.google.com/p/jquery-watermark/issues/list
triggerFns = [
"Page_ClientValidate"
],
// Holds a value of true if a watermark was displayed since the last
// hideAll() was executed. Avoids repeatedly calling hideAll().
pageDirty = false,
// Detects if the browser can handle native placeholders
hasNativePlaceholder = ( "placeholder" in document.createElement( "input" ) );
// Best practice: this plugin adds only one method to the jQuery object.
// Also ensures that the watermark code is only added once.
$.watermark = $.watermark || {
// Current version number of the plugin
version: "3.1.4",
runOnce: true,
// Default options used when watermarks are instantiated.
// Can be changed to affect the default behavior for all
// new or updated watermarks.
options: {
// Default class name for all watermarks
className: "watermark",
// If true, plugin will detect and use native browser support for
// watermarks, if available. (e.g., WebKit's placeholder attribute.)
useNative: true,
// If true, all watermarks will be hidden during the window's
// beforeunload event. This is done mainly because WebKit
// browsers remember the watermark text during navigation
// and try to restore the watermark text after the user clicks
// the Back button. We can avoid this by hiding the text before
// the browser has a chance to save it. The regular unload event
// was tried, but it seems the browser saves the text before
// that event kicks off, because it didn't work.
hideBeforeUnload: true
},
// Hide one or more watermarks by specifying any selector type
// i.e., DOM element, string selector, jQuery matched set, etc.
hide: function ( selector ) {
$( selector ).filter( selWatermarkDefined ).each(
function () {
$.watermark._hide( $( this ) );
}
);
},
// Internal use only.
_hide: function ( $input, focus ) {
var elem = $input[ 0 ],
inputVal = ( elem.value || "" ).replace( rreturn, "" ),
inputWm = $input.data( dataText ) || "",
maxLen = $input.data( dataMaxLen ) || 0,
className = $input.data( dataClass );
if ( ( inputWm.length ) && ( inputVal == inputWm ) ) {
elem.value = "";
// Password type?
if ( $input.data( dataPassword ) ) {
if ( ( $input.attr( "type" ) || "" ) === "text" ) {
var $pwd = $input.data( dataPassword ) || [],
$wrap = $input.parent() || [];
if ( ( $pwd.length ) && ( $wrap.length ) ) {
$wrap[ 0 ].removeChild( $input[ 0 ] ); // Can't use jQuery methods, because they destroy data
$wrap[ 0 ].appendChild( $pwd[ 0 ] );
$input = $pwd;
}
}
}
if ( maxLen ) {
$input.attr( "maxLength", maxLen );
$input.removeData( dataMaxLen );
}
if ( focus ) {
$input.attr( "autocomplete", "off" ); // Avoid NS_ERROR_XPC_JS_THREW_STRING error in Firefox
window.setTimeout(
function () {
$input.select(); // Fix missing cursor in IE
}
, 1 );
}
}
className && $input.removeClass( className );
},
// Display one or more watermarks by specifying any selector type
// i.e., DOM element, string selector, jQuery matched set, etc.
// If conditions are not right for displaying a watermark, ensures that watermark is not shown.
show: function ( selector ) {
$( selector ).filter( selWatermarkDefined ).each(
function () {
$.watermark._show( $( this ) );
}
);
},
// Internal use only.
_show: function ( $input ) {
var elem = $input[ 0 ],
val = ( elem.value || "" ).replace( rreturn, "" ),
text = $input.data( dataText ) || "",
type = $input.attr( "type" ) || "",
className = $input.data( dataClass );
if ( ( ( val.length == 0 ) || ( val == text ) ) && ( !$input.data( dataFocus ) ) ) {
pageDirty = true;
// Password type?
if ( $input.data( dataPassword ) ) {
if ( type === "password" ) {
var $pwd = $input.data( dataPassword ) || [],
$wrap = $input.parent() || [];
if ( ( $pwd.length ) && ( $wrap.length ) ) {
$wrap[ 0 ].removeChild( $input[ 0 ] ); // Can't use jQuery methods, because they destroy data
$wrap[ 0 ].appendChild( $pwd[ 0 ] );
$input = $pwd;
$input.attr( "maxLength", text.length );
elem = $input[ 0 ];
}
}
}
// Ensure maxLength big enough to hold watermark (input of type="text" or type="search" only)
if ( ( type === "text" ) || ( type === "search" ) ) {
var maxLen = $input.attr( "maxLength" ) || 0;
if ( ( maxLen > 0 ) && ( text.length > maxLen ) ) {
$input.data( dataMaxLen, maxLen );
$input.attr( "maxLength", text.length );
}
}
className && $input.addClass( className );
elem.value = text;
}
else {
$.watermark._hide( $input );
}
},
// Hides all watermarks on the current page.
hideAll: function () {
if ( pageDirty ) {
$.watermark.hide( selWatermarkAble );
pageDirty = false;
}
},
// Displays all watermarks on the current page.
showAll: function () {
$.watermark.show( selWatermarkAble );
}
};
$.fn.watermark = $.fn.watermark || function ( text, options ) {
/// <summary>
/// Set watermark text and class name on all input elements of type="text/password/search" and
/// textareas within the matched set. If className is not specified in options, the default is
/// "watermark". Within the matched set, only input elements with type="text/password/search"
/// and textareas are affected; all other elements are ignored.
/// </summary>
/// <returns type="jQuery">
/// Returns the original jQuery matched set (not just the input and texarea elements).
/// </returns>
/// <param name="text" type="String">
/// Text to display as a watermark when the input or textarea element has an empty value and does not
/// have focus. The first time watermark() is called on an element, if this argument is empty (or not
/// a String type), then the watermark will have the net effect of only changing the class name when
/// the input or textarea element's value is empty and it does not have focus.
/// </param>
/// <param name="options" type="Object" optional="true">
/// Provides the ability to override the default watermark options ($.watermark.options). For backward
/// compatibility, if a string value is supplied, it is used as the class name that overrides the class
/// name in $.watermark.options.className. Properties include:
/// className: When the watermark is visible, the element will be styled using this class name.
/// useNative (Boolean or Function): Specifies if native browser support for watermarks will supersede
/// plugin functionality. If useNative is a function, the return value from the function will
/// determine if native support is used. The function is passed one argument -- a jQuery object
/// containing the element being tested as the only element in its matched set -- and the DOM
/// element being tested is the object on which the function is invoked (the value of "this").
/// </param>
/// <remarks>
/// The effect of changing the text and class name on an input element is called a watermark because
/// typically light gray text is used to provide a hint as to what type of input is required. However,
/// the appearance of the watermark can be something completely different: simply change the CSS style
/// pertaining to the supplied class name.
///
/// The first time watermark() is called on an element, the watermark text and class name are initialized,
/// and the focus and blur events are hooked in order to control the display of the watermark. Also, as
/// of version 3.0, drag and drop events are hooked to guard against dropped text being appended to the
/// watermark. If native watermark support is provided by the browser, it is detected and used, unless
/// the useNative option is set to false.
///
/// Subsequently, watermark() can be called again on an element in order to change the watermark text
/// and/or class name, and it can also be called without any arguments in order to refresh the display.
///
/// For example, after changing the value of the input or textarea element programmatically, watermark()
/// should be called without any arguments to refresh the display, because the change event is only
/// triggered by user actions, not by programmatic changes to an input or textarea element's value.
///
/// The one exception to programmatic updates is for password input elements: you are strongly cautioned
/// against changing the value of a password input element programmatically (after the page loads).
/// The reason is that some fairly hairy code is required behind the scenes to make the watermarks bypass
/// IE security and switch back and forth between clear text (for watermarks) and obscured text (for
/// passwords). It is *possible* to make programmatic changes, but it must be done in a certain way, and
/// overall it is not recommended.
/// </remarks>
if ( !this.length ) {
return this;
}
var hasClass = false,
hasText = ( typeof( text ) === "string" );
if ( hasText ) {
text = text.replace( rreturn, "" );
}
if ( typeof( options ) === "object" ) {
hasClass = ( typeof( options.className ) === "string" );
options = $.extend( {}, $.watermark.options, options );
}
else if ( typeof( options ) === "string" ) {
hasClass = true;
options = $.extend( {}, $.watermark.options, { className: options } );
}
else {
options = $.watermark.options;
}
if ( typeof( options.useNative ) !== "function" ) {
options.useNative = options.useNative? function () { return true; } : function () { return false; };
}
return this.each(
function () {
var $input = $( this );
if ( !$input.is( selWatermarkAble ) ) {
return;
}
// Watermark already initialized?
if ( $input.data( dataFlag ) ) {
// If re-defining text or class, first remove existing watermark, then make changes
if ( hasText || hasClass ) {
$.watermark._hide( $input );
if ( hasText ) {
$input.data( dataText, text );
}
if ( hasClass ) {
$input.data( dataClass, options.className );
}
}
}
else {
// Detect and use native browser support, if enabled in options
if (
( hasNativePlaceholder )
&& ( options.useNative.call( this, $input ) )
&& ( ( $input.attr( "tagName" ) || "" ) !== "TEXTAREA" )
) {
// className is not set because current placeholder standard doesn't
// have a separate class name property for placeholders (watermarks).
if ( hasText ) {
$input.attr( "placeholder", text );
}
// Only set data flag for non-native watermarks
// [purposely commented-out] -> $input.data(dataFlag, 1);
return;
}
$input.data( dataText, hasText? text : "" );
$input.data( dataClass, options.className );
$input.data( dataFlag, 1 ); // Flag indicates watermark was initialized
// Special processing for password type
if ( ( $input.attr( "type" ) || "" ) === "password" ) {
var $wrap = $input.wrap( "<span>" ).parent(),
$wm = $( $wrap.html().replace( /type=["']?password["']?/i, 'type="text"' ) );
$wm.data( dataText, $input.data( dataText ) );
$wm.data( dataClass, $input.data( dataClass ) );
$wm.data( dataFlag, 1 );
$wm.attr( "maxLength", text.length );
$wm.focus(
function () {
$.watermark._hide( $wm, true );
}
).bind( "dragenter",
function () {
$.watermark._hide( $wm );
}
).bind( "dragend",
function () {
window.setTimeout( function () { $wm.blur(); }, 1 );
}
);
$input.blur(
function () {
$.watermark._show( $input );
}
).bind( "dragleave",
function () {
$.watermark._show( $input );
}
);
$wm.data( dataPassword, $input );
$input.data( dataPassword, $wm );
}
else {
$input.focus(
function () {
$input.data( dataFocus, 1 );
$.watermark._hide( $input, true );
}
).blur(
function () {
$input.data( dataFocus, 0 );
$.watermark._show( $input );
}
).bind( "dragenter",
function () {
$.watermark._hide( $input );
}
).bind( "dragleave",
function () {
$.watermark._show( $input );
}
).bind( "dragend",
function () {
window.setTimeout( function () { $.watermark._show($input); }, 1 );
}
).bind( "drop",
// Firefox makes this lovely function necessary because the dropped text
// is merged with the watermark before the drop event is called.
function ( evt ) {
var elem = $input[ 0 ],
dropText = evt.originalEvent.dataTransfer.getData( "Text" );
if ( ( elem.value || "" ).replace( rreturn, "" ).replace( dropText, "" ) === $input.data( dataText ) ) {
elem.value = dropText;
}
$input.focus();
}
);
}
// In order to reliably clear all watermarks before form submission,
// we need to replace the form's submit function with our own
// function. Otherwise watermarks won't be cleared when the form
// is submitted programmatically.
if ( this.form ) {
var form = this.form,
$form = $( form );
if ( !$form.data( dataFormSubmit ) ) {
$form.submit( $.watermark.hideAll );
// form.submit exists for all browsers except Google Chrome
// (see "else" below for explanation)
if ( form.submit ) {
$form.data( dataFormSubmit, form.submit );
form.submit = ( function ( f, $f ) {
return function () {
var nativeSubmit = $f.data( dataFormSubmit );
$.watermark.hideAll();
if ( nativeSubmit.apply ) {
nativeSubmit.apply( f, Array.prototype.slice.call( arguments ) );
}
else {
nativeSubmit();
}
};
})( form, $form );
}
else {
$form.data( dataFormSubmit, 1 );
// This strangeness is due to the fact that Google Chrome's
// form.submit function is not visible to JavaScript (identifies
// as "undefined"). I had to invent a solution here because hours
// of Googling (ironically) for an answer did not turn up anything
// useful. Within my own form.submit function I delete the form's
// submit function, and then call the non-existent function --
// which, in the world of Google Chrome, still exists.
form.submit = ( function ( f ) {
return function () {
$.watermark.hideAll();
delete f.submit;
f.submit();
};
})( form );
}
}
}
}
$.watermark._show( $input );
}
);
};
// The code included within the following if structure is guaranteed to only run once,
// even if the watermark script file is included multiple times in the page.
if ( $.watermark.runOnce ) {
$.watermark.runOnce = false;
$.extend( $.expr[ ":" ], {
// Extends jQuery with a custom selector - ":data(...)"
// :data(<name>) Includes elements that have a specific name defined in the jQuery data
// collection. (Only the existence of the name is checked; the value is ignored.)
// A more sophisticated version of the :data() custom selector originally part of this plugin
// was removed for compatibility with jQuery UI. The original code can be found in the SVN
// source listing in the file, "jquery.data.js".
data: $.expr.createPseudo ?
$.expr.createPseudo( function( dataName ) {
return function( elem ) {
return !!$.data( elem, dataName );
};
}) :
// support: jQuery <1.8
function( elem, i, match ) {
return !!$.data( elem, match[ 3 ] );
},
// Extends jQuery with a custom selector - ":watermarkable"
// Includes elements that can be watermarked, including textareas and most input elements
// that accept text input. It uses a "negative" test (i.e., testing for input types that DON'T
// work) because the HTML spec states that you can basically use any type, and if it doesn't
// recognize the type it will default to type=text. So if we only looked for certain type attributes
// we would fail to recognize non-standard types, which are still valid and watermarkable.
watermarkable: function ( elem ) {
var type,
name = elem.nodeName;
if ( name === "TEXTAREA" ) {
return true;
}
if ( name !== "INPUT" ) {
return false;
}
type = elem.getAttribute( "type" );
return ( ( !type ) || ( !rInvalidType.test( type ) ) );
}
});
// Overloads the jQuery .val() function to return the underlying input value on
// watermarked input elements. When .val() is being used to set values, this
// function ensures watermarks are properly set/removed after the values are set.
// Uses self-executing function to override the default jQuery function.
( function ( valOld ) {
$.fn.val = function () {
var args = Array.prototype.slice.call( arguments );
// Best practice: return immediately if empty matched set
if ( !this.length ) {
return args.length? this : undefined;
}
// If no args, then we're getting the value of the first element;
// else we're setting values for all elements in matched set
if ( !args.length ) {
// If element is watermarked, get the underlying value;
// else use native jQuery .val()
if ( this.data( dataFlag ) ) {
var v = ( this[ 0 ].value || "" ).replace( rreturn, "" );
return ( v === ( this.data( dataText ) || "" ) )? "" : v;
}
else {
return valOld.apply( this );
}
}
else {
valOld.apply( this, args );
$.watermark.show( this );
return this;
}
};
})( $.fn.val );
// Hijack any functions found in the triggerFns list
if ( triggerFns.length ) {
// Wait until DOM is ready before searching
$( function () {
var i, name, fn;
for ( i = triggerFns.length - 1; i >= 0; i-- ) {
name = triggerFns[ i ];
fn = window[ name ];
if ( typeof( fn ) === "function" ) {
window[ name ] = ( function ( origFn ) {
return function () {
$.watermark.hideAll();
return origFn.apply( null, Array.prototype.slice.call( arguments ) );
};
})( fn );
}
}
});
}
$( window ).bind( "beforeunload", function () {
if ( $.watermark.options.hideBeforeUnload ) {
$.watermark.hideAll();
}
});
}
})( jQuery, window );