Hi, That for..in code is incorrect, based on a misconception (a common one). This page explains the misconception and discusses correct ways of iterating through arrays: http://proto-scripty.wikidot.com/prototype:tip-looping-through-arrays
HTH, -- T.J. Crowder Independent Software Consultant tj / crowder software / com www.crowdersoftware.com On Feb 22, 12:13 pm, Dale <daniel.lehtovi...@gmail.com> wrote: > Hi > > I tried a simple javascript example on the w3school > (http://www.w3schools.com/JS/js_loop_for_in.asp), and the example works fine > if I don't include scriptaculous or prototype, but once I do I keep > getting a strange error. > > Anyone know why this error/bug shows up, or have I done something very > strange in my code ? > > Thanks for any help... examples below... > > The normal example: > <html> > <body> > > <script type="text/javascript"> > var x; > var mycars = new Array(); > mycars[0] = "Saab"; > mycars[1] = "Volvo"; > mycars[2] = "BMW"; > > for (x in mycars) > { > document.write(mycars[x] + "<br />"); > } > </script> > > </body> > </html> > Output of this one is: > Saab > Volvo > BMW > > The modified example including the library: > <html> > <head> > <script src="javascript/prototype.js" type="text/javascript"></script> > <script src="javascript/scriptaculous.js" type="text/javascript"></ > script> > </head> > <body> > <script type="text/javascript"> > var x; > var mycars = Array(); > mycars[0] = "Saab"; > mycars[1] = "Volvo"; > mycars[2] = "BMW"; > > for (x in mycars) > { > document.write(mycars[x] + "<br />");} > > </script> > </body> > </html> > > Output of this one is: > Saab > Volvo > BMW > function each(iterator, context) { var index = 0; try > { this._each(function (value) {iterator.call(context, value, index+ > +);}); } catch (e) { if (e != $break) { throw e; } } return this; } > function eachSlice(number, iterator, context) { var index = - number, > slices = [], array = this.toArray(); if (number < 1) { return array; } > while ((index += number) < array.length) > { slices.push(array.slice(index, index + number)); } return > slices.collect(iterator, context); } > function all(iterator, context) { iterator = iterator || Prototype.K; > var result = true; this.each(function (value, index) {result = result > && !!iterator.call(context, value, index);if (!result) {throw > $break;}}); return result; } > function any(iterator, context) { iterator = iterator || Prototype.K; > var result = false; this.each(function (value, index) {if ((result = !! > iterator.call(context, value, index))) {throw $break;}}); return > result; } > function collect(iterator, context) { iterator = iterator || > Prototype.K; var results = []; this.each(function (value, index) > {results.push(iterator.call(context, value, index));}); return > results; } > function detect(iterator, context) { var result; this.each(function > (value, index) {if (iterator.call(context, value, index)) {result = > value;throw $break;}}); return result; } > function findAll(iterator, context) { var results = []; > this.each(function (value, index) {if (iterator.call(context, value, > index)) {results.push(value);}}); return results; } > function findAll(iterator, context) { var results = []; > this.each(function (value, index) {if (iterator.call(context, value, > index)) {results.push(value);}}); return results; } > function grep(filter, iterator, context) { iterator = iterator || > Prototype.K; var results = []; if (Object.isString(filter)) { filter = > new RegExp(RegExp.escape(filter)); } this.each(function (value, index) > {if (filter.match(value)) {results.push(iterator.call(context, value, > index));}}); return results; } > function include(object) { if (Object.isFunction(this.indexOf)) { if > (this.indexOf(object) != -1) { return true; } } var found = false; > this.each(function (value) {if (value == object) {found = true;throw > $break;}}); return found; } > function include(object) { if (Object.isFunction(this.indexOf)) { if > (this.indexOf(object) != -1) { return true; } } var found = false; > this.each(function (value) {if (value == object) {found = true;throw > $break;}}); return found; } > function inGroupsOf(number, fillWith) { fillWith = > Object.isUndefined(fillWith) ? null : fillWith; return > this.eachSlice(number, function (slice) {while (slice.length < number) > {slice.push(fillWith);}return slice;}); } > function inject(memo, iterator, context) { this.each(function (value, > index) {memo = iterator.call(context, memo, value, index);}); return > memo; } > function invoke(method) { var args = $A(arguments).slice(1); return > this.map(function (value) {return value[method].apply(value, > args);}); } > function max(iterator, context) { iterator = iterator || Prototype.K; > var result; this.each(function (value, index) {value = > iterator.call(context, value, index);if (result == null || value >= > result) {result = value;}}); return result; } > function min(iterator, context) { iterator = iterator || Prototype.K; > var result; this.each(function (value, index) {value = > iterator.call(context, value, index);if (result == null || value < > result) {result = value;}}); return result; } > function partition(iterator, context) { iterator = iterator || > Prototype.K; var trues = [], falses = []; this.each(function (value, > index) {(iterator.call(context, value, index) ? trues : > falses).push(value);}); return [trues, falses]; } > function pluck(property) { var results = []; this.each(function > (value) {results.push(value[property]);}); return results; } > function reject(iterator, context) { var results = []; > this.each(function (value, index) {if (!iterator.call(context, value, > index)) {results.push(value);}}); return results; } > function sortBy(iterator, context) { return this.map(function (value, > index) {return {value: value, criteria: iterator.call(context, value, > index)};}).sort(function (left, right) {var a = left.criteria, b = > right.criteria;return a < b ? -1 : a > b ? 1 : 0;}).pluck("value"); } > function clone() { return slice.call(this, 0); } > function toArray() { return this.map(); } > function zip() { var iterator = Prototype.K, args = $A(arguments); if > (Object.isFunction(args.last())) { iterator = args.pop(); } var > collections = [this].concat(args).map($A); return this.map(function > (value, index) {return iterator(collections.pluck(index));}); } > function size() { return this.length; } > function inspect() { return "[" + this.map(Object.inspect).join(", ") > + "]"; } > function detect(iterator, context) { var result; this.each(function > (value, index) {if (iterator.call(context, value, index)) {result = > value;throw $break;}}); return result; } > function reverse() { [native code] } > function forEach() { [native code] } > function clear() { this.length = 0; return this; } > function first() { return this[0]; } > function last() { return this[this.length - 1]; } > function compact() { return this.select(function (value) {return > value != null;}); } > function flatten() { return this.inject([], function (array, value) > {if (Object.isArray(value)) {return array.concat(value.flatten());} > array.push(value);return array;}); } > function without() { var values = slice.call(arguments, 0); return > this.select(function (value) {return !values.include(value);}); } > function uniq(sorted) { return this.inject([], function (array, value, > index) {if (0 == index || (sorted ? array.last() != value : ! > array.include(value))) {array.push(value);}return array;}); } > function intersect(array) { return this.uniq().findAll(function (item) > {return array.detect(function (value) {return item === value;});}); } > function clone() { return slice.call(this, 0); } > function toJSON() { var results = []; this.each(function (object) {var > value = Object.toJSON(object);if (!Object.isUndefined(value)) > {results.push(value);}}); return "[" + results.join(", ") + "]"; } -- You received this message because you are subscribed to the Google Groups "Prototype & script.aculo.us" group. 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