Download File to Computer Javascript Difference Between Internal & External Javascripts

download file to computer javascript Difference Between Internal & External Javascripts. In the mid-1990s, developers at Netscape created a simple scripting language to use as a tool to make websites more interactive and engaging. This language would eventually be known as Javascript. Many users today are unaware that the features of the email client or social-networking website they depend upon are the result of thousands of lines of clever and complex Javascript programming. Internal Javascript. In order for Javascript code to work its magic, it must somehow be incorporated in the proper location on a particular web page as the page is loaded. Internal Javascript code is code that's placed anywhere within the web page between the HTML tags . Many web developers choose to place their Javascript code before the tag. External Javascript. Javascript code placed in a file separate from the HTML code is called external Javascript. External Javascript code is written and used in the same way as internal Javascript. The file should have the ".js" extension, although virtually any other extension works with modern browsers. One important difference: The external code must not be placed between the tags, or the code will not work. The web browser must know that it needs to load external code. The web page must have the following HTML tags referencing the script: The URL tells the web server where to locate and load the Javascript code. Advantages to Internal Javascript. If the number of lines of Javascript is relatively small, a web page with internal Javascript loads faster than pages that must reference external code. This is because, as the web browser loads the page and encounters the reference to the external code, it must make a separate request to the web server to fetch the code. Advantages of External Javascript. If identical code is used on several pages of a website, external Javascript files are beneficial. You only need to include a reference to the external code in those pages that actually require that code. If the Javascript code changes, only one file has to be edited; changes are instantly available to all pages needing the code. Storing Javascript in external files also makes it easier to maintain websites: The pages are less cluttered, and the web developer has fewer lines of code to wade through to make necessary edits. Fewer lines of HTML code may also help search engine spiders more thoroughly index your site and find important keywords. Finally, if a visitor moves to another page containing the same external Javascript references, the second page will load faster, because the user's browser will have cached or stored the Javascript file locally. How to download file using JavaScript only. I have an only JavaScript page and .asmx page. I want to download file using only JavaScript how can I download the file. I want to download a particular resume. I am getting resume here, 4 Answers 4. You may use different third-party libraries: jQuery.fileDownload. It takes URL as an input and downloads a file while shows a loading dialog. FileSaver.js. It takes Blob object as an input and downloads it. Blob can be acquired using XMLHttpRequest . It may also be used to save canvas -based images, dynamically generated text and any other Blob s. Or write it yourself. Now, if it is a text file, you can simply download it, create a blob, and save it: Or you can use XMLHttpRequest which works great for any types of files, including binary: Here is the working demo. Note that this fiddle downloads a file right after opening it. The file is just a random source file from GitHub. 11 Best JavaScript File Downloader Libraries. These are JavaScript libraries designed to customize file download options on your browsers. They give developers a chance to generate a download file in the browser without contact with the server. These libraries work perfectly in all HTML5 supported browsers with the use of element. A few customization and modification of libraries are needed for it to support old browsers. Now I will list down the best 11 JavaScript file downloader libraries. 1. FileSaver.js. FileSaver.js provides a solution to file saving on the client-side. It works just fine in generating files to be saved on the client-side. However, it is a good practice to implement content disposition attachment response header for more cross-browser compatibility. 2. StreamSaver.js. StreamSaver.js is a library adapted for larger files, even bigger than blobs. It is advisable when computer RAM is limited to implement StreamSaver.js. Advanced settings can save data directly into your physical hard drive. The data is saved asynchronously with the power of streaming API that supports progress, canceling and notification. 3. Canvas-toBlog.js. Canvas-toBlog.js is used for implementing canvas.toBlog( ) in HTML5 or canvas.toBlogHD ( ) when the browser do not support the latter natively. In either way, the Blob support function is still a requirement for many unsupported functions. implementation of the above library with Blob.js, it becomes a cross-browser. 4. Blob.js. Blob.js is implemented with other types of libraries like the canvas.toBlob( ), mainly for browsers that are not supported by canvas.toBlob natively. Blob.js implements a W3C blob interface unsupported natively by the browser. Blob.js supports all the browsers supported in FileSaver.js and more. 5. jQuery.fileDownload.js. jQuery.fileDownload.js is a cross-server platform that allows better download experience to the users. Its features include developer control over successCallback or fail callback for them to have total control over the user experience. In conjunction jQuery UI, a developer can easily implement a UI modal that tells the user when a download is occurring, when it disbands the modal and give feedback to the users in a friendly manner that download error just occurred. In jQuery.fileDownload.js. File downloads don’t occur on the current window so that if something went wrong, the users don’t have to leave the current page. 6. Js File Downloader. Js File Downloader is simple, no dependency library able to download a file from the browser and show the progress bar to guide users on download speed and download status. 7. downloads. downloadjs is one of the file downloader libraries that use client-side JavaScript. It has 1191 stars on GitHub as of the date I am publishing this article, currently licensed under MIT and uses free public CDN web front-end services. downloadjs is proudly sponsored by Cloudflare, agolia, and DigitalOcean. 8. JavaScript Assets Downloader. JavaScript asset downloader is a collection of links to browser versions of popular JavaScript libraries. It is used to quickly download and compare libraries if they are at par with the local current version update wise. 9. riloadr. riloadr is a cross-browser library that is framework independent and it is highly responsive to image loaders written in JavaScript. They deliver optimized and contextual image sizes responsive to layouts and different resolutions. riloadr has no dependencies, easy-to-use and has absolute control because it processes only what you command to process. A noticeable feature of riloadr is its ability to make one request per image only. 10. PDF.js. PDF.js is a portable document format viewer built with HTML5 in mind. It allows users to download or upload, render and view PDF files in different browsers, which supports PDF.js, for browsers without support, additional plugins may be required beforehand. 11. File Manager.js. File Manager.js is a rich user interface widget that guides users when downloading web files and folders in a handy way. It allows working with hierarchical data. It is possible to download and search for necessary files in the folder. With file manager.js, you can perform any contemporary operations like copy, paste, cut, rename and more. Conclusion. It exists a rich JavaScript file downloader libraries. It is easy to implement JavaScript file downloader using libraries that coding from scratch, it saves a bunch of development time and reduces the chances of bugs in the code. I mentioned 11 best of them in my opinion, but your list could be different, don’t fret anyway, but offer a suggestion of a file downloader you feel it should be on the list. Your comments are welcome! Download File Using JavaScript/jQuery. I have a very similar requirement specified here. I need to have the user's browser start a download manually when $('a#someID').click(); But I cannot use the window.href method, since it replaces the current page contents with the file you're trying to download. Instead I want to open the download in new window/tab. How is this possible? 29 Answers 29. Use an invisible : To force the browser to download a file it would otherwise be capable of rendering (such as HTML or text files), you need the server to set the file's MIME Type to a nonsensical value, such as application/x-please-download-me or alternatively application/octet-stream , which is used for arbitrary binary data. If you only want to open it in a new tab, the only way to do this is for the user to a click on a link with its target attribute set to _blank . In jQuery: Whenever that link is clicked, it will download the file in a new tab/window. 2019 modern browsers update. This is the approach I'd now recommend with a few caveats: A relatively modern browser is required If the file is expected to be very large you should likely do something similar to the original approach (iframe and cookie) because some of the below operations could likely consume system memory at least as large as the file being downloaded and/or other interesting CPU side effects. 2012 original jQuery/iframe/cookie based approach. I have created the jQuery File Download plugin (Demo) (GitHub) which could also help with your situation. It works pretty similarly with an iframe but has some cool features that I have found quite handy: Very easy to setup with nice visuals (jQuery UI Dialog, but not required), everything is tested too. User never leaves the same page they initiated a file download from. This feature is becoming crucial for modern web applications. successCallback and failCallback functions allow for you to be explicit about what the user sees in either situation. In conjunction with jQuery UI a developer can easily show a modal telling the user that a file download is occurring, disband the modal after the download starts or even inform the user in a friendly manner that an error has occurred. See the Demo for an example of this. Hope this helps someone! Here is a simple use case demo using the plugin source with promises. The demo page includes many other, 'better UX' examples as well. Check if your target browser(s) will run the above snippet smoothly: http://caniuse.com/#feat=download. I'm surprised not a lot of <a href="/tags/People_(Windows)/" rel="tag">people</a> know about the download attribute for a elements. Please help spread the word about it! You can have a hidden html link, and fake a click on it. If the html link has the download attribute it downloads the file, not views it, no matter what. Here's the code. It will download a cat picture if it can find it. I recommend using the download attribute for download instead of jQuery: This will download your file, without opening it. If you are already using jQuery, you could take adventage of it to produce a smaller snippet A jQuery version of Andrew's answer: This could be helpful if you are not require to navigate another page. This is base javascript function, so can be used in any platform where backend is in Javascript. Works on Chrome, Firefox and IE8 and above. Simple example using an iframe. Then just call the function wherever you want: Only seven years later here comes a one line jQuery solution using a form instead of an iframe or link: I've tested this in. Chrome 55 Firefox 50 Edge IE8-10 iOS 10 (Safari/Chrome) Android Chrome. If anyone knows of any downsides with this solution I'd be very happy to hear about them. I ended up using the below snippet and it works in most browsers, not tested in IE though. Update. I don't know if the question is just too old, but setting window.location to a download url will work, as long as the download mime type is correct (for example a zip archive). Most Complete and Working (Tested) Code for Downloading Data For FireFox, Chrome and IE Code is Following. Assume that Data is in texarea field, that has id='textarea_area' and filename is name of file where data will be downloaded. and then just call. For Download Initiating. Array for setting correct MIME type for download dialog CAN BE following: To improve Imagine Breaker 's answer, this is supported on FF & IE : In other words, just use a dispatchEvent function instead of click() ; Maybe just have your javascript open a page that just downloads a file, like when you drag a download link to a new tab: With the opened window open a download page that auto closes. for me this is working ok tested in chrome v72. I have had good results with using a FORM tag since it works everywhere and you don't have to create temporarily files on server. The method works like this. On the client side (page HTML) you create an invisible form like this. Then you add this Javascript code to your button: The on the server-side you have the following PHP code in download.php : You can even create zip files of your data like this: The best part is it does not leave any residual files on your server since everything is created and destroyed on the fly! There are so many little things that can happen when trying to download a file. The inconsistency between browsers alone is a nightmare. I ended up using this great little library. https://github.com/rndme/download. Nice thing about it is that its flexible for not only urls but for client side data you want to download. text string text dataURL text blob text arrays html string html blob ajax callback binary files. The answer submitted by hitesh on Dec 30 '13 does in fact work. It just requires a little adjusting: The PHP file can call itself. In other words, just create a file named saveAs.php, and put this code into it. These functions are used in stacktrace.js: I suggest you use the mousedown event, which is called BEFORE the click event. That way, the browser handles the click event naturally, which avoids any code weirdness: Excelent solution from Corbacho, I just adapted to get rid o the var. Firefox and Chrome tested: This is actually the "chrome" way solution for firefox (I am not tested it on other browsers, so please leave comments about the compilability) To create a HTMl file and download. To create and download a CSV. You can simply make use of the Download attribute in HTML. Using good ol' Javascript, you can use this feature to download the file directly. The download attribute of the anchor tag should point to the link where the file to be downloaded is hosted. Firstly, point the URL to your resource path: Create an anchor tag, with the needed attributes as below: Append the anchor tag to the body element of the webpage. Now trigger the click event programmatically. Clicking on the anchor tag will trigger the download. Putting it all together: Additional Information : Nothing fancy in the above code, just client-side JavaScript which works from Chrome Devtools' Console, but powerful and also opens up a lot of possibilities like webpage crawling. For e.g. the following chunk of code executed in the Devtools console will open all the links in the page in a new tab: Just goto this webpage , open devtools and run this script in the browser console and watch the power of JavaScript unfurl. (Note: The below code is purely for educational purposes only.) Make sure you enable pop-ups for that site, else your anchor clicks will get disabled by the default pop-up blocker. Note: This is not just limited to anchor clicks, you can download almost anything you find on your webpage. If something (image, audio, video) loads on your webpage, you can probably write a script to download it, even if the provision is not provided to you from the UI. How to Install JavaScript. JavaSript is a lightweight dynamic programming language. Programs written in this language are called as scripts, these scripts are embedded in webpages and they can manipulate the HTML content. These scripts execute as web pages are loaded, JavaScripts do not need to be compiled to execute. Previously JavaScript was known as LiveScript, but later it was changed to JavaSript. As Java was very popular at that time and introducing a new language with the similarity in names would be beneficial they thought. But later JavaScript became an independent language with its own specification called ECMAScript. Netscape 2.0 is the first where the implementation of javascript was first seen. The syntax of JavaScript is more influenced by programming language ‘<a href="/tags/C_(programming_language)/" rel="tag">c</a>’. Storing New Information. New identities can be assigned using JavaScript in particular, it is also useful for assigning to the existing website with proceeding values depending on the decisions the user makes while visiting the web page. For example, let’s say we have created a web page with a form where we would like to generate data from capturing information about a website visitor. We want to store the first name of a user, so for that, we have a “string” of JavaScript dedicated to the user’s first name. We would see the example of the same where the string may look something like this: Web development, programming languages, Software testing & others. function updateFirstname() let Firstname = prompt('First Name'); > Then, once we have a visitor on our website, we can have him to enter his or her first name, and any other information we want to acquire or process from the web page once he agrees to submit the form, this action updates the identity of the initially undefined “Firstname” element in our code. Here’s how we can thank our website visitor with his name in JavaScript para.textContent = ‘Thanks, ‘ + Firstname + “! Hope you had a great time with us.” Security, Games, and Special Effects. JavaScript can be used for security password creation, check forms, games, providing online animations and special effects. Mobile apps and server-based applications can be built using JavaScript. You can add JavaScript to an HTML document by adding these “scripts,” or snippets of JavaScript code, into your document’s header or body. How to Install JavaScript In <a href="/tags/Internet_Explorer/" rel="tag">Internet Explorer</a>? On the web browser, click on Tools or the “Tools” icon which looks like a gear (generally present on the right side) and select Internet Options. Then the “Internet Options” window opens, there we need to select the Security tab. On selecting the “Security” tab, we need to select Internet zone and then click on the “Custom level…” button. After clicking on the custom level… a pop-up box Security Settings-Internet Zone will appear, there we need to go to scripting section and change it to enable. Now we will get a “Warning!” window popped up asking, “Are you sure you want to change the settings for this zone?” select “yes”. Click “ok” at the bottom of the Internet Options and all other windows open to close them. These are the steps to install JavaScript in IE (Internet Explorer). Now as we have installed JavaScript we need an editor to write a script. So now we will see how to install JavaScript editor PyCharm, where we can write JavaScript. Pycharm is a cross-platform editor, here we will be using it for JavaScripts. PyCharm Supports Which languages? PyCharm can be used for development in many languages. JavaScript is also one of the languages supported by PyCharm. Using professional edition we can develop Django, Flask and Pyramid applications as well. Also, it fully supports HTML5, CSS and XML. All the languages are bundled in the IDE via plugins, and they are present by default. We can add more plugins so that it can support other languages and frameworks also. 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