Resources in Angular 4 (and 5) are scarce. Really. Sometimes I get so lost in sifting through Stack Overflow that I end up translating the answers that I have found in older versions (1.x and 2.x) using the latest Angular docs.
For newbs like me, I initially resorted to search for packages in NPM, only to know that some are barely maintained, not tested for compatibility with newer versions of Angular, or have too many features that I do not need.
Download Image On Button Click Angular
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I particularly disliked angular.element as it is just a wrapper that still utilizes jQuery and as much as possible I like to keep my code free from imports that I can't reuse. Ultimately, I came across a more efficient solution by using HTMLElement, an interface from Web API.
When browse is clicked, openFileBrowser($event) is called with $event as the argument. This is so we can use preventDefault() to prevent the normal behavior of an anchor tag of redirecting to the page it is pointed to.
Hi Monique, how do you unit-test the example? I have created a similar application but I am unable to unit-test it as I don't know how to trigger the change event from file selector. I have created a question in StackOverflow. Would it be possible for you to take a look at stackoverflow.com/questions/542022...
I like this sample more or less cuz the element-id could be used in a dynamical way. i.e. if I don't know the id at the codeing time but only on runtime I can still use the given approach. Which I like :-)
I've tried your approach above and also the one Matteo Rigon provided. Both of them resulted to 'ERROR TypeError: Cannot read property 'click' of undefined'. Did I missed out something before applying these approaches to trigger click event? I'm using Angular 7 by the way.
If you wish to implement a button column with images and a working click event, you can try the approach presented in the following demo: -widgets-demo/demos/jqxgrid/customwidgetscolumn.htm?light. We hope it is helpful to you.
This custom component is going to have an upload loading indicator, and it's going to support upload cancelation as well. We are going to give also an example (in Node) of how to handle the file in the backend.
When the user chooses a file using the file upload dialog, an event of type
change will be emitted. This event will then contain the list of files that the user selected on the target.files property.
When the change event gets triggered, the file is not automatically uploaded to the backend by the browser. Instead, we will need to trigger an HTTP request ourselves, in response to the change event.
Because a plain input of type file is impossible to style properly, what we end up doing is hiding it from the user, and then building an alternative file upload UI that uses the file input behind the scenes.
Notice in the component template how the upload blue button and the invisible file input are linked. When the user clicks on the blue button, a click handler triggers the file input via fileUpload.click().
At this point, we would already have a working file upload component. But we want to take this component one step further. We want to be able to display a progress indicator to the user, and also support upload cancelation.
While the upload is still in progress, the user might decide to cancel it by clicking on the cancel button. Then the cancelUpload() upload method is going to get triggered and the HTTP request can be canceled by unsubscribing from the uploadSub subscription.
I hope that you have enjoyed this post, if you would like to learn a lot more about Angular, we recommend checking the Angular Core Deep Dive course, where we will cover all of the advanced Angular features in detail.
The share() method of the Navigator interface invokes the native sharing mechanism of the device to share data such as text, URLs, or files. The available share targets depend on the device, but might include the clipboard, contacts and email applications, websites, Bluetooth, etc.
The method resolves a Promise with undefined. On Windows this happens when the share popup is launched, while on Android the promise resolves once the data has successfully been passed to the share target.
Properties that are unknown to the user agent are ignored; share data is only assessed on properties understood by the user agent. All properties are optional but at least one known data property must be specified.
This method requires that the current document have the web-share Permissions Policy and transient activation. (It must be triggered off a UI event like a button click and cannot be launched at arbitrary points by a script.) Further, the method must specify valid data that is supported for sharing by the native implementation.
\n The method resolves a Promise with undefined.\n On Windows this happens when the share popup is launched, while on Android the promise resolves once the data has successfully been passed to the share target.\n
\n Properties that are unknown to the user agent are ignored; share data is only assessed on properties understood by the user agent.\n All properties are optional but at least one known data property must be specified.\n
I have a button with an image inside, the image source is linked to a variable through Angular binding. This variable is changed through an Observable, shared between the page and a component through a service. My problem is that when this variable is changed, there is an evident delay for the image update.
If I interact with the page, the image is updated, otherwise the image will remain static (previous value) until something in the page is changed or received from non related functions. From the log I can see that the variable value is updated, but the image in the button not.
While I was minimizing the code to make it easier to understand the problem I believe I have found the source of this problem. There is a considerably large function that is used by the component mentioned, I believe it was one of the first that I did, that function ends up mixing some features of different versions of ECMAS. For now I have no way to make such a big modification to the app to prove this theory, so I believe we can end here for now. Thank you for your help!
Within a few weeks I had a functioning application that met all my needs. But a funny thing happened soon after I launched. Other people started using the application. Knowing I had created something useful for a large audience was really satisfying. And so I did what any other developer who is already stretched thin and trying to balance a full time job and a family and hobby projects would do: I spent my nights, weekends, and every free moment I had working on it.
When I say they were becoming a hindrance, what I really mean is that my lack of knowledge of the technologies had come back to bite me. For all the reasons I had chosen them, there were plenty of other reasons that might have made me think differently, had I known about them.
Web browsers work using a traditional client-server model. A web browser (the client) sends a request for some page to a web host (the server). The server sends back some HTML to the web browser. That HTML includes structured text along with links to other files such as images, CSS, JavaScript, etc. The combination of the HTML, along with these other files, allows the web browser to render a meaningful web page for the user.
And thus the world turns. You click a link, your web browser sends the request to the server, and the server sends back some HTML. Every response back from the server is the full HTML document required to render a web page.
Instead, it contains a handful of placeholder elements, along with some links to JavaScript files. These JavaScript files are the heart and soul of the single-page app. Once loaded, they send back requests to the server to fetch content, and then dynamically update the HTML in the web browser to create a meaningful web page.
By all outward appearances, the application behaves like a traditional web site. The user sees HTML with images and buttons and interacts the exact same way. But under the hood things are very much different.
Just like a web browser, Google and other web crawlers request the HTML contents for pages on a web site. But instead of rendering it like a web browser would, it analyzes the HTML to semantically understand what the web page is about.
And like most single-page apps, the default HTML included lots of helpful developer information that is intended to be used for trouble-shooting, but never actually displayed in a web browser when things are working properly. Even worse, the template is the same for all URLs on the site, so Google got the same (wrong) interpretation for every page it crawled.
Another area I ran into problems with was social sharing. My website allowed users to create dynamic content, and also included lots of static content that others might find useful. And in the early days of launching, I indeed saw that people were sharing links to my websites across various social media platforms:
For example, when you share a link to a website on Facebook, the first thing that happens is Facebook reads the webpage and generates a nice preview of that article. The preview has a title, a line or two of descriptive text, and an image.
In my case, Facebook was falling victim to the same problem Google was. It was reading the template HTML file as-is, and not applying the JavaScript that would help fill in the metadata and create meaningful previews. 152ee80cbc
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