API stands for Application Program Interface, which can be defined as a set of methods of communication between various software components. JavaScript is easy to learn. Basic knowledge of HTML and CSS would also be useful. See here for an interactive demonstration along with implementation details.. Usage. Now we have a description of our contracts function and the arguments it takes we can create a ‘contract’ object using web3.eth.contract() a function which takes two arguments, the first is the address of the contract as a 160bit hex string, the second is the contract description: Lets go back and amend our ‘createSolidityContract()’ function to also create this object: Here we have made a couple of important changes, firstly we have declared a new variable ‘address’ which is the value returned by the transact function which creates our contract. Perhaps we also need a function that will do something if the user has not entered anything and pressed the button. In our previous examples we showed how it was possible to interact with contracts using the transact pane in Alethzero by building a data array to pass to contracts. In the beginning, we created the data object based on the API documentation. Reporting Observer. The result is as follows: We got a message saying that our object is deleted. This tutorial will show you how to use the Sync API with the Contentful JavaScript SDK. Add this to your html page: We have come across this code before and previously uploaded it to the blockchain using Alethzero’s transact pane. Putting this all together to create a javascript object describing our contract: Make careful note of the curly brackets indicating objects, and the square brackets indicating arrays. Now we have bytecode we can pass it as a paramenter in the transact function using the “code:” prefix like this: web3.eth.transact({code: '0x60056011565b60ae8060326000396000f35b612710600033600160a060020a0316600052602052604060002081905550560060e060020a6000350480637bb98a6814601e578063d0679d3414602a57005b6024603d565b60006000f35b60366004356024356042565b60006000f35b5b600081565b80600033600160a060020a0316600052602052604060002054106063576067565b60aa565b80600033600160a060020a0316600052602052604060002090815403908190555080600083600160a060020a031660005260205260406000209081540190819055505b505056'}). Change ), You are commenting using your Google account. To open a connection to the API, you will use XMLHttpRequest objects, useful to make verb HTTP requests. Firstly we will create a Javascript object containing code for our Solidity metaCoin. We will make a POST request to the specified address with the object and headers. also how can I tell the javascript when I call “contract.send(receiverAddress, amount);” to send a certain amount of ether with the transaction? In this task, we will be helped by Text-Processing API, which is available through the RapidAPI service. Since these headers will be in each request, they also need to be put into a separate variable. For support, please email us at [email protected]. We can easily setup a JS function which takes these arguments from our html form and passes them to the contract: When executed this generates a larger pop-up window warning you that the client has received a request from the front end to send a transaction which includes data. Then we either get a successful response and output it to the browser console, or the request ends with an error and we also display it in the console. API acts as a layer between your application and external service. Now we will create our small application for analyzing the sentiment of comments. Copy and paste the above into your html template. The second parameter is the necessary headers. thank you, Your email address will not be published. JavaScript is a lightweight, interpreted programming language. Make a GET request with id again to show that the DELETE method worked and the object is definitely not there. Copy the below into our html template and open the web page in Alethzero: It should be fairly easy to see how this works, the transact function is being passed a JSON object with attributes ‘to’ and ‘value’ whose values are pulled from our form input. It is open and cross-platform. WordPress. Because developing a full word-processor application is a significant undertaking, this tutorial provides a simpler application that uses the DictionaryService and Dictionary SPI. Common APIs: Introduced with Office 2013, the Common API can be used to access features such as UI, dialogs, and client settings that are common across multiple types of Office applications. Copy and paste the below into your html document: This allows us to create a contract with one click from the browser window. Add JavaScript Site-Wide Using Insert Headers and Footers JAAS – JSON as a service is not found on rapidapi.com . That is, here we create a student object on the server. You can use this method to compile and deploy any contract you want through the browser. API acts as a layer between your application and external service. We will also need to keep his average score. Microsoft Word Object Model. This object model is part of Microsoft Word (not Javascript) and it lets you "automate" word remotely from other programs (not just web pages, but any computer program). This completes the tutorial on transactions, in the next JS API tutorial we will cover using ‘accessor’ functions, making calls to functions and sending other general commands to the client. To use Office JavaScript APIs within any of your add-in's web pages, you must reference the CDN in a