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Hello and welcome to this lecture on air Jacks event.

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If you've done javascript or query before then you will know what events are.

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Events are easy.

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Visit us reaction or activities on a website.

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Events can include things like a mouse click a button click and a form submission.

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Ajax has an event called the on ready state change event when a request to this server is sent.

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We may want to perform certain actions based on the response from the server be on read this date change

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event triggers every time the release date changes.

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So did read this did property holds this date us off the exim Mail haste TTP requests.

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So there are three important properties of the exit mail.

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TTP request objects.

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So you've got the on ready state change.

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You've got it red state.

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And then you've got to state us so there are three properties or the three key properties of the SML

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Hayes TTP request object are the on ready stage Change event.

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They've got the red this date and then this date us be on red is date change event is used to store

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in store if function is stores a function or the name of a function to be called or vault automatically

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each time the read listed property changes.

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So if this date changes it triggers the function and it performs an action.

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The red state holds the status of the so mail his TTP request and the values ranges from zero to four.

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So when is set to zero.

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That means your request has not been immortalise yet.

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When is wrong one means this server has made a connection and it has been recognized when it's on.

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Three is process in the request.

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When this date when the release date is for the request has finished and the response is now ready then

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you look in the status.

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When this data is 200 That means it's okay but when it's 4 0 4 email the page can not be found.

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So when using be on read this date event you need to specify what state.

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If it's an error it read this date and also.

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If it's or k..

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So you're specifying two things you're specifying the real estate.

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If the register is 4 and the existing does this 200 swear by you have read this for the status 200.

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That means the response is good to go.

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So the on ready state start already did change event this event here is Treat get.

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Every time the read this date changes.

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So disraeli's Stayed holds 5 values 0 to 4 0 1 2 3 4.

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So any time value changes.

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Be on the date event will perform a function.

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So this on this did change event has a function so that function is triggered every time the ready state

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changes.

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So this read this did.

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As for values from zero to four.

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So any time change is this unregistered Change event will trigger a function automatically.

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So in responding to this registry change thing you need to remember is that the this date holds 5 values

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of the state as these values represent this.

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Details of this here.

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T T P Es SML a dtp request object.

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So it determines what state this x x l s t t B request object is.

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So when they read this date is and 0.

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It means the request has not been initialized yet.

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See.

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So when the state is of them in the server has established a connection when the request he registered

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is to the request.

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That means your request has been received.

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When the red state is 3 that means the request is being processed.

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When they read this date it is for them is the request is finished and the response is ready all is

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done and then you look at the status statuses and read them.

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Is it's okay and it's good to go.

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If you have in this state or 4 0 reform mermin the page could not be found.

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So in the order of the already state change event you need to specify what will happen when the server

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response is ready to be processed.

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So for example you can see when the red state is 4 and the state is 208.

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The response is ready.

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Thank you so much for your time in this lecture.

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We looked had the horn ready state change event which is a Doubt's reef event and it has an radius date

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of 0 tool for an East date change triggers an action from the already state change event when this data

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is to uncorrect immense is good to go.

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Everything's okay.

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Thank you so much for your time.

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Bye for now.