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00:00:00 – 00:15:29
The video provides an in-depth explanation of URL encoding, a crucial technique for web developers to safely transfer data in URLs. Using examples from HTML, JavaScript, and PHP, the speaker demonstrates how input fields are converted into query strings, and how special characters and spaces are handled through encoding. Key JavaScript functions discussed include `encodeURIComponent` and `decodeURIComponent`, essential for encoding and decoding URI components. The video also covers how browsers like Chrome handle URL encoding, converting spaces to plus signs and special characters to percent-encoded strings, and how PHP decodes these parameters using the `$_GET` global array. Emphasizing the importance of only encoding specific parameters, the speaker cautions against double encoding and suggests consulting library documentation for handling Ajax requests. Overall, the video ensures viewers understand the process and significance of URL encoding and decoding, enhancing their web development skills.
00:00:00
In this part of the video, the speaker explains URL encoding on the web. They emphasize its importance for web developers and describe it as a method for safely transferring data in URLs. The speaker provides an example with a simple search form, demonstrating how input fields are transformed into query strings within the URL. They show how entering search terms and names translates into URL parameters separated by ampersands, which illustrates the need for URL encoding to handle special characters and spaces correctly. The speaker also mentions that they will showcase two JavaScript functions, `encodeURIComponent` and `decodeURIComponent`, to further explain the concept.
00:03:00
In this part of the video, the speaker explains how the web browser encodes URL query strings before sending them to the web server. By pressing submit, the input query “search equals dumb and then plus then % 26 then plus and then dogs” is URL encoded by the browser, converting spaces to plus signs and ampersands to %26. The speaker uses the developer tools (opened with F12) to inspect the network tab and documents section, showing the details of the request. It is demonstrated that Chrome decodes the URL encoded value back to its original form: “space ampersand space.” This process is validated by toggling the view source to display both the encoded and decoded query strings, emphasizing the importance of understanding URL encoding and decoding when making web requests.
00:06:00
In this part of the video, the presenter demonstrates how to use PHP to output URL parameters by utilizing the `print_r` function and passing in the `$_GET` global array. They enhance the readability of the output by incorporating `
` tags. After saving and refreshing the page to resubmit the form, the presenter shows how the PHP code automatically decodes the URL parameters, displaying values such as "dumb and dogs" derived from the URL. They further explain encoding by using examples with special characters like `&` and `+`, illustrating the importance of URL encoding for transferring data, and how PHP handles these encoded parameters by decoding them into their original form.00:09:00
In this segment, the focus is on demonstrating the use of two JavaScript functions for URL encoding and decoding. The presenter removes some PHP code and highlights the script section in an HTML document. They showcase how to define a string constant and then use the `encodeURIComponent` function to encode the URL. This is verified by checking the console output. Additionally, it is emphasized that while these functions are useful for Ajax requests, one should be cautious as some libraries, like jQuery, automatically URL encode parameters. Therefore, it is advisable to consult the library’s documentation before manually encoding values.
00:12:00
In this part of the video, the speaker discusses encoding and decoding URIs in JavaScript. They emphasize the importance of not double encoding values, advising that encoding should only be for specific parameters rather than the whole URL to avoid errors. The speaker demonstrates how adding a symbol like a plus sign in a form gets encoded as a percent symbol representation and stresses encoding only keys and values. They also explain how to use `decodeURIComponent` to revert an encoded value back to its original form. Lastly, they illustrate how spaces in strings are encoded as `%20`.
00:15:00
In this part of the video, the speaker explains that spaces in URLs can be encoded as a plus sign in Chrome browsers. They emphasize the importance of understanding both representations of a space in URL encoding. The speaker concludes by inviting viewers to leave comments if they have any questions and expresses their willingness to assist further.