installing_embarkjs.html
1 <!DOCTYPE html> 2 <html lang="en" dir="ltr"> 3 <head prefix="og: http://ogp.me/ns#"> 4 <meta charset="utf-8"> 5 <title>Configuring EmbarkJS | Embark</title> 6 <meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1"> 7 <meta name="viewport" content="width=device-width, initial-scale=1"> 8 <!-- Canonical links --> 9 <link rel="canonical" href="https://framework.embarklabs.io/docs/installing_embarkjs.html"> 10 <!-- Alternative links --> 11 12 13 <!-- Icon --> 14 <meta name="msapplication-TileColor" content="#080E1A"> 15 <link rel="icon" type="image/png" href="/assets/images/favicon-16.png" sizes="16x16" /> 16 <link rel="icon" type="image/png" href="/assets/images/favicon-32.png" sizes="32x32" /> 17 18 <link rel="apple-touch-icon" sizes="76x76" href="/assets/images/apple-touch-icon-60x60-precomposed.png"> 19 <link rel="apple-touch-icon" sizes="76x76" href="/assets/images/apple-touch-icon-76x76-precomposed.png"> 20 <link rel="apple-touch-icon" sizes="120x120" href="/assets/images/apple-touch-icon-120x120-precomposed.png"> 21 <link rel="apple-touch-icon" sizes="152x152" href="/assets/images/apple-touch-icon-152x152-precomposed.png"> 22 <link rel="apple-touch-icon" sizes="180x180" href="/assets/images/apple-touch-icon-precomposed.png"> 23 <link rel="apple-touch-icon" href="/assets/images/apple-touch-icon-precomposed.png"> 24 <!-- CSS --> 25 26 <link rel="stylesheet" href="/css/embark.css"> 27 28 <!-- endbuild --> 29 30 <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.3.0/css/font-awesome.min.css"> 31 <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/docsearch.js@2/dist/cdn/docsearch.min.css" /> 32 33 <!-- RSS --> 34 <link rel="alternate" href="/atom.xml" title="Embark"> 35 <meta property="og:image" content="/img/share.png?v=0.0.5" /> 36 <link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.15.4/styles/dracula.min.css"> 37 38 <script async defer src="https://buttons.github.io/buttons.js"></script> 39 40 41 <script> 42 !function(root, factory) { 43 "function" == typeof define && define.amd ? // AMD. 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c-navigation__subnav"> 264 <li class="o-list-bare__item"> 265 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 266 </li> 267 </ul> 268 </div> --> 269 </li> 270 271 <li class="o-list-bare__item"> 272 <a href="/docs/faq.html" title="FAQ" class="u-link-uniform ">FAQ</a> 273 <!-- <div class="o-distance-m"> 274 <ul class="o-list-bare c-navigation__subnav"> 275 <li class="o-list-bare__item"> 276 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 277 </li> 278 </ul> 279 </div> --> 280 </li> 281 282 </ul> 283 284 285 <div class="o-distance-xl"> 286 <h3 class="c-category-title">General Usage</h3> 287 <ul class="o-list-bare"> 288 289 <li class="o-list-bare__item"> 290 <a href="/docs/create_project.html" title="Creating apps" class="u-link-uniform ">Creating apps</a> 291 <!-- <div class="o-distance-m"> 292 <ul class="o-list-bare c-navigation__subnav"> 293 <li class="o-list-bare__item"> 294 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 295 </li> 296 </ul> 297 </div> --> 298 </li> 299 300 <li class="o-list-bare__item"> 301 <a href="/docs/structure.html" title="App structure" class="u-link-uniform ">App structure</a> 302 <!-- <div class="o-distance-m"> 303 <ul class="o-list-bare c-navigation__subnav"> 304 <li class="o-list-bare__item"> 305 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 306 </li> 307 </ul> 308 </div> --> 309 </li> 310 311 <li class="o-list-bare__item"> 312 <a href="/docs/running_apps.html" title="Running apps" class="u-link-uniform ">Running apps</a> 313 <!-- <div class="o-distance-m"> 314 <ul class="o-list-bare c-navigation__subnav"> 315 <li class="o-list-bare__item"> 316 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 317 </li> 318 </ul> 319 </div> --> 320 </li> 321 322 <li class="o-list-bare__item"> 323 <a href="/docs/dashboard.html" title="Using the dashboard" class="u-link-uniform ">Using the dashboard</a> 324 <!-- <div class="o-distance-m"> 325 <ul class="o-list-bare c-navigation__subnav"> 326 <li class="o-list-bare__item"> 327 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 328 </li> 329 </ul> 330 </div> --> 331 </li> 332 333 <li class="o-list-bare__item"> 334 <a href="/docs/using_the_console.html" title="Using the console" class="u-link-uniform ">Using the console</a> 335 <!-- <div class="o-distance-m"> 336 <ul class="o-list-bare c-navigation__subnav"> 337 <li class="o-list-bare__item"> 338 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 339 </li> 340 </ul> 341 </div> --> 342 </li> 343 344 <li class="o-list-bare__item"> 345 <a href="/docs/environments.html" title="Environments" class="u-link-uniform ">Environments</a> 346 <!-- <div class="o-distance-m"> 347 <ul class="o-list-bare c-navigation__subnav"> 348 <li class="o-list-bare__item"> 349 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 350 </li> 351 </ul> 352 </div> --> 353 </li> 354 355 <li class="o-list-bare__item"> 356 <a href="/docs/configuration.html" title="Configuration" class="u-link-uniform ">Configuration</a> 357 <!-- <div class="o-distance-m"> 358 <ul class="o-list-bare c-navigation__subnav"> 359 <li class="o-list-bare__item"> 360 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 361 </li> 362 </ul> 363 </div> --> 364 </li> 365 366 <li class="o-list-bare__item"> 367 <a href="/docs/pipeline_and_webpack.html" title="Building & Compiling" class="u-link-uniform ">Building & Compiling</a> 368 <!-- <div class="o-distance-m"> 369 <ul class="o-list-bare c-navigation__subnav"> 370 <li class="o-list-bare__item"> 371 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 372 </li> 373 </ul> 374 </div> --> 375 </li> 376 377 <li class="o-list-bare__item"> 378 <a href="/docs/executing_scripts.html" title="Executing Scripts" class="u-link-uniform ">Executing Scripts</a> 379 <!-- <div class="o-distance-m"> 380 <ul class="o-list-bare c-navigation__subnav"> 381 <li class="o-list-bare__item"> 382 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 383 </li> 384 </ul> 385 </div> --> 386 </li> 387 388 <li class="o-list-bare__item"> 389 <a href="/docs/javascript_usage.html" title="Using EmbarkJS" class="u-link-uniform ">Using EmbarkJS</a> 390 <!-- <div class="o-distance-m"> 391 <ul class="o-list-bare c-navigation__subnav"> 392 <li class="o-list-bare__item"> 393 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 394 </li> 395 </ul> 396 </div> --> 397 </li> 398 399 </ul> 400 </div> 401 402 <div class="o-distance-xl"> 403 <h3 class="c-category-title">Smart Contract Development</h3> 404 <ul class="o-list-bare"> 405 406 <li class="o-list-bare__item"> 407 <a href="/docs/contracts_configuration.html" title="Configuration" class="u-link-uniform ">Configuration</a> 408 <!-- <div class="o-distance-m"> 409 <ul class="o-list-bare c-navigation__subnav"> 410 <li class="o-list-bare__item"> 411 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 412 </li> 413 </ul> 414 </div> --> 415 </li> 416 417 <li class="o-list-bare__item"> 418 <a href="/docs/contracts_deployment.html" title="Accounts & Deployment" class="u-link-uniform ">Accounts & Deployment</a> 419 <!-- <div class="o-distance-m"> 420 <ul class="o-list-bare c-navigation__subnav"> 421 <li class="o-list-bare__item"> 422 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 423 </li> 424 </ul> 425 </div> --> 426 </li> 427 428 <li class="o-list-bare__item"> 429 <a href="/docs/contracts_imports.html" title="Special Imports" class="u-link-uniform ">Special Imports</a> 430 <!-- <div class="o-distance-m"> 431 <ul class="o-list-bare c-navigation__subnav"> 432 <li class="o-list-bare__item"> 433 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 434 </li> 435 </ul> 436 </div> --> 437 </li> 438 439 <li class="o-list-bare__item"> 440 <a href="/docs/contracts_testing.html" title="Testing" class="u-link-uniform ">Testing</a> 441 <!-- <div class="o-distance-m"> 442 <ul class="o-list-bare c-navigation__subnav"> 443 <li class="o-list-bare__item"> 444 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 445 </li> 446 </ul> 447 </div> --> 448 </li> 449 450 <li class="o-list-bare__item"> 451 <a href="/docs/contracts_javascript.html" title="Smart Contracts in JavaScript" class="u-link-uniform ">Smart Contracts in JavaScript</a> 452 <!-- <div class="o-distance-m"> 453 <ul class="o-list-bare c-navigation__subnav"> 454 <li class="o-list-bare__item"> 455 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 456 </li> 457 </ul> 458 </div> --> 459 </li> 460 461 </ul> 462 </div> 463 464 <div class="o-distance-xl"> 465 <h3 class="c-category-title">Blockchain Client</h3> 466 <ul class="o-list-bare"> 467 468 <li class="o-list-bare__item"> 469 <a href="/docs/blockchain_configuration.html" title="Configuration" class="u-link-uniform ">Configuration</a> 470 <!-- <div class="o-distance-m"> 471 <ul class="o-list-bare c-navigation__subnav"> 472 <li class="o-list-bare__item"> 473 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 474 </li> 475 </ul> 476 </div> --> 477 </li> 478 479 <li class="o-list-bare__item"> 480 <a href="/docs/blockchain_accounts_configuration.html" title="Managing Accounts" class="u-link-uniform ">Managing Accounts</a> 481 <!-- <div class="o-distance-m"> 482 <ul class="o-list-bare c-navigation__subnav"> 483 <li class="o-list-bare__item"> 484 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 485 </li> 486 </ul> 487 </div> --> 488 </li> 489 490 </ul> 491 </div> 492 493 <div class="o-distance-xl"> 494 <h3 class="c-category-title">Storage (IPFS/Swarm)</h3> 495 <ul class="o-list-bare"> 496 497 <li class="o-list-bare__item"> 498 <a href="/docs/storage_configuration.html" title="Configuration" class="u-link-uniform ">Configuration</a> 499 <!-- <div class="o-distance-m"> 500 <ul class="o-list-bare c-navigation__subnav"> 501 <li class="o-list-bare__item"> 502 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 503 </li> 504 </ul> 505 </div> --> 506 </li> 507 508 <li class="o-list-bare__item"> 509 <a href="/docs/storage_deployment.html" title="Deploying apps" class="u-link-uniform ">Deploying apps</a> 510 <!-- <div class="o-distance-m"> 511 <ul class="o-list-bare c-navigation__subnav"> 512 <li class="o-list-bare__item"> 513 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 514 </li> 515 </ul> 516 </div> --> 517 </li> 518 519 <li class="o-list-bare__item"> 520 <a href="/docs/storage_javascript.html" title="Storage APIs in JavaScript" class="u-link-uniform ">Storage APIs in JavaScript</a> 521 <!-- <div class="o-distance-m"> 522 <ul class="o-list-bare c-navigation__subnav"> 523 <li class="o-list-bare__item"> 524 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 525 </li> 526 </ul> 527 </div> --> 528 </li> 529 530 </ul> 531 </div> 532 533 <div class="o-distance-xl"> 534 <h3 class="c-category-title">Messages (Whisper)</h3> 535 <ul class="o-list-bare"> 536 537 <li class="o-list-bare__item"> 538 <a href="/docs/messages_configuration.html" title="Configuration" class="u-link-uniform ">Configuration</a> 539 <!-- <div class="o-distance-m"> 540 <ul class="o-list-bare c-navigation__subnav"> 541 <li class="o-list-bare__item"> 542 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 543 </li> 544 </ul> 545 </div> --> 546 </li> 547 548 <li class="o-list-bare__item"> 549 <a href="/docs/messages_javascript.html" title="Messages in JavaScript" class="u-link-uniform ">Messages in JavaScript</a> 550 <!-- <div class="o-distance-m"> 551 <ul class="o-list-bare c-navigation__subnav"> 552 <li class="o-list-bare__item"> 553 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 554 </li> 555 </ul> 556 </div> --> 557 </li> 558 559 </ul> 560 </div> 561 562 <div class="o-distance-xl"> 563 <h3 class="c-category-title">Naming Systems (ENS)</h3> 564 <ul class="o-list-bare"> 565 566 <li class="o-list-bare__item"> 567 <a href="/docs/naming_configuration.html" title="Configuration" class="u-link-uniform ">Configuration</a> 568 <!-- <div class="o-distance-m"> 569 <ul class="o-list-bare c-navigation__subnav"> 570 <li class="o-list-bare__item"> 571 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 572 </li> 573 </ul> 574 </div> --> 575 </li> 576 577 <li class="o-list-bare__item"> 578 <a href="/docs/naming_javascript.html" title="Naming Systems in JavaScript" class="u-link-uniform ">Naming Systems in JavaScript</a> 579 <!-- <div class="o-distance-m"> 580 <ul class="o-list-bare c-navigation__subnav"> 581 <li class="o-list-bare__item"> 582 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 583 </li> 584 </ul> 585 </div> --> 586 </li> 587 588 </ul> 589 </div> 590 591 <div class="o-distance-xl"> 592 <h3 class="c-category-title">Plugins</h3> 593 <ul class="o-list-bare"> 594 595 <li class="o-list-bare__item"> 596 <a href="/docs/installing_plugins.html" title="Installing plugins" class="u-link-uniform ">Installing plugins</a> 597 <!-- <div class="o-distance-m"> 598 <ul class="o-list-bare c-navigation__subnav"> 599 <li class="o-list-bare__item"> 600 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 601 </li> 602 </ul> 603 </div> --> 604 </li> 605 606 <li class="o-list-bare__item"> 607 <a href="/docs/creating_plugins.html" title="Creating plugins" class="u-link-uniform ">Creating plugins</a> 608 <!-- <div class="o-distance-m"> 609 <ul class="o-list-bare c-navigation__subnav"> 610 <li class="o-list-bare__item"> 611 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 612 </li> 613 </ul> 614 </div> --> 615 </li> 616 617 <li class="o-list-bare__item"> 618 <a href="/docs/plugin_reference.html" title="Plugin APIs" class="u-link-uniform ">Plugin APIs</a> 619 <!-- <div class="o-distance-m"> 620 <ul class="o-list-bare c-navigation__subnav"> 621 <li class="o-list-bare__item"> 622 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 623 </li> 624 </ul> 625 </div> --> 626 </li> 627 628 </ul> 629 </div> 630 631 <div class="o-distance-xl"> 632 <h3 class="c-category-title">Cockpit Guides</h3> 633 <ul class="o-list-bare"> 634 635 <li class="o-list-bare__item"> 636 <a href="/docs/cockpit_introduction.html" title="Introduction" class="u-link-uniform ">Introduction</a> 637 <!-- <div class="o-distance-m"> 638 <ul class="o-list-bare c-navigation__subnav"> 639 <li class="o-list-bare__item"> 640 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 641 </li> 642 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class="o-guided-content__content"> 766 <p class="c-meta">Last updated: February 18th 2020 767 (<a href="https://github.com/embarklabs/embark/edit/master/site/source/docs/installing_embarkjs.md" target="_blank"> 768 Improve this guide <svg class="c-icon c-icon--xs"><use xlink:href="/../../assets/icons/symbols.svg#icon-pen-write-paper"></use></svg> 769 </a>) 770 </p> 771 <div class="o-standard-page"> 772 <h1>Configuring EmbarkJS</h1> 773 <p>Embark includes in your Dapp the EmbarkJS library. This library abstracts different functionalities, so you can easily & quickly build powerful Dapps that leverage different decentralized technologies.<br>Embark will automatically initialize EmbarkJS with the configurations set for your particular environment. You just need to connect it to a blockchain node, like explained <a href="#Connecting">below</a>.</p> 774 <h3 id="Connecting"><a href="#Connecting" class="headerlink" title="Connecting"></a>Connecting</h3><p>Before using EmbarkJS and Contract functions, we need to make sure that Embark is connected to a blockchain node.</p> 775 <p>For that, EmbarkJS provides the <code>Blockchain.connect()</code> function that receives a configuration object.<br>Luckily, Embark generates the necessary config by looking at your configuration files and outputs it in its generation folder. The default directory is <code>embarkArtifacts/</code>, but you can change that in <code>embark.json</code> by changing <code>generationDir</code>.</p> 776 <p>Let’s see what that generated config file looks like at <code>embarkArtifacts/config/blockchain.json</code>:</p> 777 <figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">{</span><br><span class="line"> "dappConnection": [</span><br><span class="line"> "$WEB3",</span><br><span class="line"> "$EMBARK",</span><br><span class="line"> "ws://localhost:8546"</span><br><span class="line"> ],</span><br><span class="line"> "dappAutoEnable": true,</span><br><span class="line"> "warnIfMetamask": true,</span><br><span class="line"> "blockchainClient": "geth"</span><br><span class="line">}</span><br></pre></td></tr></table></figure> 778 779 780 <h4 id="Connection-parameters"><a href="#Connection-parameters" class="headerlink" title="Connection parameters:"></a>Connection parameters:</h4><ul> 781 <li><strong>dappConnection</strong>: Copied from the contracts config. This is the list of connections Embark will try to connect to in order. For more information, look at <a href="/docs/javascript_usage.html#Using-dappConnection">the guide on EmbakJS</a>.</li> 782 <li><strong>dappAutoEnable</strong>: Copied from the contracts config. This tells EmbarkJS to either automatically connect to Metamask (or Mist) or wait for the developper (you) to do it.<ul> 783 <li>Read more on it <a href="#Provider">below</a></li> 784 </ul> 785 </li> 786 <li><strong>warnIfMetamask</strong>: Is true when <code>isDev</code> is true in the blockchain config. Will warn you in the console if Metamask is detected, to make sure you connect Metamask correctly to the local node.</li> 787 <li><strong>blockchainClient</strong>: Copied from the blockchain config. This tells EmbarkJS which blockchain client it is connecting to and it will warn about the different problematic behaviours you could experience.</li> 788 </ul> 789 <h3 id="Utilities"><a href="#Utilities" class="headerlink" title="Utilities"></a>Utilities</h3><p>EmbarkJS also includes a <code>onReady</code> function. This is very useful to ensure that your Dapp only starts interacting with contracts when the proper connection to web3 has been made and ready to use.</p> 790 <figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">import EmbarkJS from 'Embark/EmbarkJS';</span><br><span class="line">import SimpleStorage from 'Embark/contracts/SimpleStorage';</span><br><span class="line"></span><br><span class="line">EmbarkJS.onReady((error) => {</span><br><span class="line"> if (error) {</span><br><span class="line"> console.error('Error while connecting to web3', error);</span><br><span class="line"> return;</span><br><span class="line"> }</span><br><span class="line"> SimpleStorage.methods.set(100).send();</span><br><span class="line">});</span><br></pre></td></tr></table></figure> 791 792 <h3 id="Provider"><a href="#Provider" class="headerlink" title="Provider"></a>Provider</h3><p>As of <a href="https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1102.md" target="_blank" rel="noopener">EIP1102</a>, decentralized applications MUST request account access. Embark offers several options on how to implement this.</p> 793 <p>An Embark application’s Smart Contract configuration file (typically located in <code>config/contracts.js</code>) comes with a <code>dappAutoEnable</code> property which controls whether or not EmbarkJS should automatically try to request account access:</p> 794 <figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">...</span><br><span class="line"> // Automatically call `ethereum.enable` if true.</span><br><span class="line"> // If false, the following code must run before sending any transaction: `await EmbarkJS.enableEthereum();`</span><br><span class="line"> // Default value is true.</span><br><span class="line"> // dappAutoEnable: true,</span><br><span class="line">...</span><br></pre></td></tr></table></figure> 795 796 797 <p>By default, the value of <code>dappAutoEnable</code> is true which means that Embark will call <code>ethereum.enable</code> for you to request account access when the first page of the dapp is loaded.</p> 798 <p>If you want more control, you can set <code>dappAutoEnable</code> to false.<br>Then, if you want to request account access, you can use the following code:</p> 799 <figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">...</span><br><span class="line"> try {</span><br><span class="line"> const accounts = await EmbarkJS.enableEthereum();</span><br><span class="line"> // access granted</span><br><span class="line"> } catch() {</span><br><span class="line"> // access not granted</span><br><span class="line"> }</span><br><span class="line">...</span><br></pre></td></tr></table></figure> 800 801 <p>This will request account access and if the user grants access to his accounts, you will be able to make transaction calls.</p> 802 <h3 id="Components"><a href="#Components" class="headerlink" title="Components"></a>Components</h3><ul> 803 <li><a href="contracts_javascript.html">EmbarkJS.Contract</a> - To interact with smart contracts. Typically Embark automatically initializes all your deployed contracts with this. uses web3.js 1.2.6</li> 804 <li><a href="storage_javascript.html">EmbarkJS.Storage</a> - To interact with the configured decentralized storage. Includes bindings to save & retrieve data, upload & download files, etc..</li> 805 <li><a href="messages_javascript.html">EmbarkJS.Communication</a> - To interact with the configured decentralized messages system. Includes bindings to listen to topics and send messages.</li> 806 <li><a href="naming_javascript.html">EmbarkJS.Names</a> - To interact with the configured decentralized naming system such as ENS. Includes bindings to look up the address of a domain name as well as retrieve a domain name given an address.</li> 807 </ul> 808 809 </div> 810 <div class="o-container-medium o-distance-l"> 811 <div class="o-flex o-flex-space-between"> 812 813 814 <div class="o-flex__item"> 815 <a href="/docs/overview.html" class="c-button c-button--quite" title="Next article">Next</a> 816 </div> 817 818 </div> 819 820 821 </div> 822 </div> 823 <div class="o-guided-content__addition"> 824 <h3 class="c-category-title">Contents</h3> 825 <ol class="o-list-bare"><li class="o-list-bare__item o-list-bare-level-3 o-ellipsis"><a href="#Connecting" class="u-link-uniform">Connecting</a><ol class="o-list-bare__child"><li class="o-list-bare__item o-list-bare-level-4 o-ellipsis"><a href="#Connection-parameters" class="u-link-uniform">Connection parameters:</a></li></ol></li><li class="o-list-bare__item o-list-bare-level-3 o-ellipsis"><a href="#Utilities" class="u-link-uniform">Utilities</a></li><li 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