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jquery.fieldspy.js
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jquery.fieldspy.js
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/**
* Fieldspy jQuery Plugin v1.0
* https://github.com/marclarr/fieldspy/
*
* @license
* Copyright 2016 Marc Wiest (https://marcwiest.com)
* Released under the MIT license
*/
(function($) {
$.fn.fieldspy = function( condition, callback ) {
var target = this,
fields = getSelectors();
if ( ! fields ) {
return;
}
/**
* Establish the initial value.
*/
$(fields).ready( function() {
var endResult = evalCondition( condition );
// feed the endResult and "this" back to the callee
callback.apply( target, [endResult] );
});
/**
* Watch fields for changes.
*/
$(fields).change( function() {
var endResult = evalCondition( condition );
// feed the endResult and "this" back to the callee
callback.apply( target, [endResult] );
});
/**
* Evaluate Condition
*
* @return boolean True if the condition passes, false otherwise.
*/
function evalCondition( condition ) {
var results = {},
endResult = false;
// fill results object with the results of each && group
$.each( condition, function( i, group ) {
var groupId = "g"+i;
results[ groupId ] = true;
$.each( group, function( field, reqVal ) {
if ( $.type(reqVal) === "string" ) {
reqVal = [ reqVal ];
}
// var reqVal = condition.value,
var curVal = getFieldValue( field ),
isMatch = compareValues( curVal, reqVal );
// If only 1 field fails, the whole group returns false.
// This simulates the && operator's behavior.
if ( isMatch === false ) {
results[ groupId ] = false;
}
});
});
// test the results object and set endResult to true or false
$.each( results, function( id, result ) {
// If any group is true, the endResult returns true.
// This simulates the || operator's behavior.
if ( result === true ) {
endResult = true;
}
});
return endResult;
}
/**
* Get Selectors String
*
* This function compiles a string of all conditional fields selectors.
*
* @return string All conditional fields selectors.
*/
function getSelectors() {
var selectors = '',
max = condition.length,
temp = [];
for ( var i = 0; i < max; i++ ) {
for ( var selector in condition[i] ) {
if ( $.inArray( selector, temp ) === -1 ) {
temp.push( selector );
var comma = (selectors === '') ? '' : ', ';
selectors += comma + selector;
}
}
}
return selectors;
}
/**
* Get Field Value
*
* Filters the field type and gets its value.
*
* @return array The field's current value.
*/
function getFieldValue( field ) {
var curVal = [];
$(field).each( function( i, elem ) {
var $elem = $(elem),
isCheckbox = $elem.is('input:checkbox'),
isRadio = $elem.is('input:radio'),
isSelect = $elem.is('select');
if ( isCheckbox || isRadio ) {
if ( $elem.is(':checked') ) {
curVal.push( $elem.val() );
}
} else if ( isSelect ) {
curVal.push( $elem.val() );
}
});
return curVal;
}
/**
* Compare Values
*
* Compares the current value to the required value.
*
* @return bool Returns true if all required values exist.
*/
function compareValues( curVal, reqVal ) {
// if any one reqVal does not exist, match fails
var match = true;
$.each( reqVal, function( i, val ) {
if ( $.inArray( val, curVal ) === -1 ) {
match = false;
}
});
return match;
}
};
})( jQuery );