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Add an explanation about XHR #13
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mkruijt
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Oct 22, 2017
Week5/REVIEW.MD
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| ## XMLHTtpRequest | ||
| **XMLHttpRequest** is an objects to interact with servers. You can retrieve data from a URL without having to do a full page refresh. XMLHttpRequest is used heavily in Ajax programming. - [MDN](https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest) | ||
| ## XMLHttpRequest | ||
| **XMLHttpRequest** is an objects to interact with servers. You can retrieve data from a URL without having to do a full page refresh. XMLHttpRequest is used heavily in Ajax programming - [MDN](https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest). |
Week5/REVIEW.MD
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| So what is Ajax? | ||
| **Ajax** is a method of exchanging data with a server, and updating parts of a web page without reloading the entire page. | ||
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| Let's diving a bit deeply into the code: | ||
| Let's diving into the code: |
Week5/REVIEW.MD
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| * 1 : request has been set up. | ||
| * 2 : request has been sent. | ||
| * 3 : request is in process. | ||
| * 4 : request is complete. | ||
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| In the code below we are checking if the request is complete or not, and we check the status == 200 just to make sure that we do not get 404 error. - Take a look about [HTTP Status Code](https://httpstatuses.com). | ||
| In the code below we are checking if the request is complete or not, and we check the status == 200 just to make sure that we do not get 404 error - Take a look about [HTTP Status Code](https://httpstatuses.com). |
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Read more about it here: (instead of take a look about)
Week5/REVIEW.MD
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| First, we need to make an instance from 'XMLHttpRequest' class. | ||
| First, we need to make an instance from 'XMLHttpRequest' object. | ||
| ```javascript |
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you can also just type "js", less typing 😄
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Hi @mkruijt , |
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Hi @mkruijt ,
I have added an explanation about XHR in the review of week 5.