Prototype update select value

These methods are also copied to the Form. Element object so you don't typically use the methods from Form. Methods directly, but rather via the Form. Element object for consistency. This object provides some utility functions that are used internally in the library to assist extracting the current value of the form elements.

This class is used as the base class for the other classes that will monitor one element until its value or whatever property the derived class defines changes. Subclasses can be created to monitor things like the input value of an element, or one of the style properties, or number of rows in a table, or whatever else you may be interested in tracking changes to.

Inherits from Abstract. Implementation of an Abstract. TimedObserver that monitors the value of form input elements. Use this class when you want to monitor an element that does not expose an event that reports the value changes. In that case you can use the Form. EventObserver class instead. TimedObserver that monitors any changes to any data entry element's value in a form. Use this class when you want to monitor a form that contains a elements that do not expose an event that reports the value changes.

This class is used as the base class for the other classes that execute a callback function whenever a value-changing event happens for an element. Multiple objects of type Abstract.

EventObserver can be bound to the same element, without one wiping out the other. The callbacks will be executed in the order they are assigned to the element. EventObserver that executes a callback function to the appropriate event of the form data entry element to detect value changes in the element. If the element does not expose any event that reports changes, then you can use the Form. Observer class instead. EventObserver that monitors any changes to any data entry element contained in a form, using the elements' events to detect when the value changes.

If the form contains elements that do not expose any event that reports changes, then you can use the Form. This object provides a host of functions that help when working with element positioning. The clone method of the Position object takes an optional third argument, used to more detailedly control the cloning operation.

The documentation for v1. Stay tuned for updates in this document. If you find errors, inaccurate or incomplete information, or flat-out nonsense, please and I'll try to fix it as soon as possible. Developer Notes for prototype. What is that? Request class Using the Ajax. Updater class What are all those "? Responders object The Ajax. Base class The Ajax.

Request class The options argument object The Ajax. Updater class The Ajax. Methods object The Element. Insertion class The Insertion object The Insertion. Before class The Insertion. Top class The Insertion. Bottom class The Insertion. Methods object The Form. Element object The Form. Serializers object The Abstract. TimedObserver class The Form. Observer class The Form. Observer class The Abstract. EventObserver class The Form. EventObserver class The Position object. Provides a way to implement inheritance by copying all properties and methods from source to destination.

Returns a human-readable string representation of targetObj. It defaults to the return value of toString if the given object does not define an inspect instance method.

Returns an Array with the names of all the properties and methods of given object. Returns a Array with the values of all the properties and methods of given object. Returns the hexadecimal representation of the number. Returns the next number. This function is used in scenarios that involve iterations.

Calls the iterator function repeatedly passing the current index in the index argument. The returned function will use the same arguments as the original one arg1, arg2, The returned function will have the current event object as its first argument followed optionally any other arguments passed after the object argument.

Converts a hyphen-delimited-string into a camelCaseString. This function is useful when writing code that deals with style properties, for example.

Returns a string that results from finding or matching the pattern string or regular expression in the current string and replacing it with the replacement string or the result of calling the replacement function passing an array with the strings that matched the pattern, including eventual regular expression groupings.

Provides a way to iterate over matched patterns in the string and operate on them. The pattern argument can be a string or a RegExp but a RegExp is evidently more useful. Similarly, the replacement argument can be a string or a function but it probably only makes sense to pass in a function to be able to produce anything useful. Very similar to gsub but only performs a limited number of replacements, specified by the count parameter. Splits the string into an Array of its characters. Splits a querystring into an associative Array indexed by parameter name more like a hash.

Used to produce a string of a known maximum length. In case the string needs to be truncated to maintain the maximum length, the text given in the truncation argument is used to replace the last few characters.

This function seems to be directly target at supporting Ruby on Rails functionality. Returns the array without the elements that are null or undefined. This method does not change the array itself.

Returns a flat, one-dimensional version of the array. This flattening happens by finding each of the array's elements that are also arrays and including their elements in the returned array, recursively. Returns the zero-based position of the given value if it is found in the array. Returns -1 if value is not found. Overridden to return a nicely formatted string representation of the array with its elements. Returns the array in reverse sequence. If no argument is given or if the argument is true the array itself will be changed.

Otherwise it will remain unchanged. Returns the first element and removes it from the array, reducing the array's length by 1. Returns the array excluding the elements that are included in the list of arguments. Returns all the elements that are associated with the given CSS class name. If no parentElement id given, the entire document body will be searched. List of cached observers. Part of the internal implementation details of the object. Returns true if the left mouse button was clicked.

Use this function to abort the default behavior of an event and to suspend its propagation. Traverses the DOM tree upwards, searching for the first element with the given tag name, starting from the element that originated the event.

Private method, do not worry about it. Clears all cached observers from memory. Creates one instance of this object that will call the function repeatedly. This method is what will be called by the timer.

It, in turn, will invoke the callback method passing the object itself. The function to be called. A handle to the underlying timer object responsible for repeatedly invoking the callback method.

Calls the given iterator function passing each element in the list in the first argument and the index of the element in the second argument. This function is a way to test the entire collection of values using a given function.

It will return false otherwise. If no iterator is given, then the test will be if the element itself resolves to true. You can simply read it as "check if all elements pass the test. You can simply read it as "check if any element passes the test. Calls the iterator function for each element in the collection and returns each result in an Array , one result element for each element in the collection, in the same sequence. Calls the iterator function for each element in the collection and returns the first element that caused the iterator function to return true or, more precisely, not-false.

If no element returns true, then detect returns null. Calls the iterator function for each element in the collection and returns an Array with all the elements that caused the iterator function to return a value that resolves to true.

This function is the opposite of reject. Tests the string value of each element in the collection against the pattern regular expression. The function will return an Array containing all the elements that matched the regular expression. If the iterator function is given, then the Array will contain the result of calling the iterator with each element that was a match.

Tries to find the given object in the collection. Returns true if the object is found, false otherwise. Returns the collection broken in groups containing as many items as specified by the first argument. If the quantity of items in the initial collection is not divisible by the number in the first argument, the resulting empty items at the end of the last group will be filled with null or with the value of the second argument, if provided.

Quick example: ['a','b','c','d']. Combines all the elements of the collection using the iterator function. The iterator is called passing the result of the previous iteration in the accumulator argument.

The first iteration gets initialValue in the accumulator argument. The last result is the final return value. Calls the method specified by methodName in each element of the collection, passing any given arguments arg1 to argN , and returns the results in an Array object. Returns the element with the greatest value in the collection or the greatest result of calling the iterator for each element in the collection, if an iterator is given.

Returns the element with the lowest value in the collection or the lowest result of calling the iterator for each element in the collection, if an iterator is given. Returns an Array containing two other arrays. The first array will contain all the elements that caused the iterator function to return true and the second array will contain the remaining elements.

If the iterator is not given, then the first array will contain the elements that resolve to true and the other array will contain the remaining elements. This can also contain the index of the element. Retrieves the value to the property specified by propertyName in each element of the collection and returns the results in an Array object.

Calls the iterator function for each element in the collection and returns an Array with all the elements that caused the iterator function to return a value that resolves to false. This function is the opposite of findAll. Returns an Array with all the elements sorted according to the result the iterator function call.

Returns an Array with all the elements of the collection. Merges each given collection with the current collection. The merge operation returns a new array with the same number of elements as the current collection and each element is an array let's call them sub-arrays of the elements with the same index from each of the merged collections. If the transform function is given, then each sub-array will be transformed by this function before being returned. Quick example: [1,2,3].

Returns an Array with the keys of all items. Returns an Array with the values of all items. Combines the hash with the other hash passed in and returns the new resulting hash.

Returns all the items of the hash in a string formatted like a query string, e. Overridden to return a nicely formatted string representation of the hash with its key:value pairs. Creates one range object, spanning from start to end.

It is important to note that start and end have to be objects of the same type and they must have a succ method. Checks if the given value is part of the range. Returns true or false. When the corresponding event occurs all the registered objects that contain a method with the appropriate name will have that method called. The object passed in the responderToRemove argument will be removed from the list of registered objects.

Runs through the list of registered objects looking for the ones that have the method determined in the callback argument. Then each of these methods is called passing the other 3 arguments. If the event is onException , the transport argument will have the exception instead and json will not be passed. Sets the desired options for the AJAX operation. Returns true if the AJAX operation succeeded, false otherwise.

Creates one instance of this object that will call the given url using the given options. The onCreate event will be raised during the constructor call. Important: It is worth noting that the chosen url is subject to the browser's security settings.

In many cases the browser will not fetch the url if it is not from the same host domain as the current page. You should ideally use only local urls to avoid having to configure or restrict the user's browser. Thanks Clay.

This method is typically not called externally. Call this only after the AJAX call is completed. It is called by the object itself when the AJAX call status changes. It is already called during the constructor call. List of HTTP headers to be passed with the request. This list must have an even number of items, any odd item is the name of a custom header, and the following even item is the string value of that header. Example: ['my-header1', 'this is the value', 'my-other-header', 'another value'].

The character encoding used in the body of a request especially POST requests. UTF-8 should be enough in most cases, but if you know what you're doing, you can use a different encoding. Events , and the HTTP status codes. Custom function to be called when the AJAX call completes successfully. Custom function to be called when the AJAX call completes with error.

How do I select an option using prototype Ask Question. Asked 12 years, 5 months ago. Active 7 years, 5 months ago. Viewed 55k times. Rob W k 77 77 gold badges silver badges bronze badges. Add a comment. Active Oldest Votes. RaYell RaYell If you have id's for your all options set then yes, you can do it like that. DavidWinterbottom DavidWinterbottom 6, 5 5 gold badges 36 36 silver badges 39 39 bronze badges. I thought that. SilverlightFox Thanks, works like a charm! Qrizly Qrizly 11 1 1 bronze badge.

Note: The prototype chain is traversed only while retrieving properties. If properties are set or delete d directly on the object, the prototype chain is not traversed. Note: Before ECMAScript , there wasn't officially a way to access an object's prototype directly — the "links" between the items in the chain are defined in an internal property, referred to as [[prototype]] in the specification for the JavaScript language see ECMAScript. For example, try person1. So, where are the inherited properties and methods defined?

If you look at the Object reference page, you'll see listed in the left hand side a large number of properties and methods — many more than the number of inherited members we saw available on the person1 object. Some are inherited, and some aren't — why is this? As mentioned above, the inherited ones are the ones defined on the prototype property you could call it a sub-namespace — that is, the ones that begin with Object.

The prototype property's value is an object, which is basically a bucket for storing properties and methods that we want to be inherited by objects further down the prototype chain. So Object. Note: This seems strange — how can you have a method defined on a constructor, which is itself a function? Well, a function is also a type of object. See the Function constructor reference if you don't believe us. You'll see a large number of methods defined on Object 's prototype property, which are then available on objects that inherit from Object , as shown earlier.

You'll see other examples of prototype chain inheritance all over JavaScript — try looking for the methods and properties defined on the prototype of the String , Date , Number , and Array global objects, for example. These all have a number of members defined on their prototype, which is why for example when you create a string, like this:. Note: It is worth reading our more in-depth guide to " Using prototypes in JavaScript ", once you've made sense of this section and wish to know more.

This section is intentionally simplified to make these concepts a little easier to understand when you first meet them. Earlier on we showed how the Object. Every constructor function has a prototype property whose value is an object containing a constructor property. This constructor property points to the original constructor function.

As you will see in the next section, properties defined on the Person. Hence, the constructor property is also available to both person1 and person2 objects.

This works well. You won't need to use it often, but it can be really useful when you want to create a new instance and don't have a reference to the original constructor easily available for some reason. The constructor property has other uses. For example, if you have an object instance and you want to return the name of the constructor it is an instance of, you can use the following:.

Note: The value of constructor. Therefore, for more complex examples, you'll want to use the instanceof operator instead.