Files
api/docs/assets/js/79.68181558.js
T
2019-02-26 15:22:01 +00:00

1 line
10 KiB
JavaScript

(window.webpackJsonp=window.webpackJsonp||[]).push([[79],{424:function(t,s,n){"use strict";n.r(s);var a=n(46),e=Object(a.a)({},function(){var t=this,s=t.$createElement,n=t._self._c||s;return n("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[n("h1",{attrs:{id:"simple-connect"}},[n("a",{staticClass:"header-anchor",attrs:{href:"#simple-connect","aria-hidden":"true"}},[t._v("#")]),t._v(" Simple Connect")]),t._v(" "),n("p",[t._v("The following example shows how to instantiate a Polkadot API object and use it to connect to a node using ApiPromise.")]),t._v(" "),n("div",{staticClass:"language-js line-numbers-mode"},[n("pre",{pre:!0,attrs:{class:"language-js"}},[n("code",[n("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// @ts-check")]),t._v("\n"),n("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Required imports")]),t._v("\n"),n("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("const")]),t._v(" "),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v(" ApiPromise"),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" WsProvider "),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v(" "),n("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),n("span",{pre:!0,attrs:{class:"token function"}},[t._v("require")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),n("span",{pre:!0,attrs:{class:"token string"}},[t._v("'@polkadot/api'")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n"),n("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("async")]),t._v(" "),n("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("function")]),t._v(" "),n("span",{pre:!0,attrs:{class:"token function"}},[t._v("main")]),t._v(" "),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),n("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Initialise the provider to connect to the local node")]),t._v("\n "),n("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("const")]),t._v(" provider "),n("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),n("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("new")]),t._v(" "),n("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("WsProvider")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),n("span",{pre:!0,attrs:{class:"token string"}},[t._v("'ws://127.0.0.1:9944'")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),n("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Create the API and wait until ready")]),t._v("\n "),n("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("const")]),t._v(" api "),n("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),n("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("await")]),t._v(" ApiPromise"),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),n("span",{pre:!0,attrs:{class:"token function"}},[t._v("create")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("provider"),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n "),n("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Retrieve the chain & node information information via rpc calls")]),t._v("\n "),n("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("const")]),t._v(" "),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("chain"),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" nodeName"),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" nodeVersion"),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),n("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),n("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("await")]),t._v(" Promise"),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),n("span",{pre:!0,attrs:{class:"token function"}},[t._v("all")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("\n api"),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("rpc"),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("system"),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),n("span",{pre:!0,attrs:{class:"token function"}},[t._v("chain")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n api"),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("rpc"),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("system"),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),n("span",{pre:!0,attrs:{class:"token function"}},[t._v("name")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n api"),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("rpc"),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("system"),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),n("span",{pre:!0,attrs:{class:"token function"}},[t._v("version")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n console"),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),n("span",{pre:!0,attrs:{class:"token function"}},[t._v("log")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),n("span",{pre:!0,attrs:{class:"token template-string"}},[n("span",{pre:!0,attrs:{class:"token string"}},[t._v("`You are connected to chain ")]),n("span",{pre:!0,attrs:{class:"token interpolation"}},[n("span",{pre:!0,attrs:{class:"token interpolation-punctuation punctuation"}},[t._v("${")]),t._v("chain"),n("span",{pre:!0,attrs:{class:"token interpolation-punctuation punctuation"}},[t._v("}")])]),n("span",{pre:!0,attrs:{class:"token string"}},[t._v(" using ")]),n("span",{pre:!0,attrs:{class:"token interpolation"}},[n("span",{pre:!0,attrs:{class:"token interpolation-punctuation punctuation"}},[t._v("${")]),t._v("nodeName"),n("span",{pre:!0,attrs:{class:"token interpolation-punctuation punctuation"}},[t._v("}")])]),n("span",{pre:!0,attrs:{class:"token string"}},[t._v(" v")]),n("span",{pre:!0,attrs:{class:"token interpolation"}},[n("span",{pre:!0,attrs:{class:"token interpolation-punctuation punctuation"}},[t._v("${")]),t._v("nodeVersion"),n("span",{pre:!0,attrs:{class:"token interpolation-punctuation punctuation"}},[t._v("}")])]),n("span",{pre:!0,attrs:{class:"token string"}},[t._v("`")])]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),n("span",{pre:!0,attrs:{class:"token function"}},[t._v("main")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),n("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("catch")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("console"),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("error"),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),n("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("finally")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),n("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=>")]),t._v(" process"),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),n("span",{pre:!0,attrs:{class:"token function"}},[t._v("exit")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),n("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])]),t._v(" "),n("div",{staticClass:"line-numbers-wrapper"},[n("span",{staticClass:"line-number"},[t._v("1")]),n("br"),n("span",{staticClass:"line-number"},[t._v("2")]),n("br"),n("span",{staticClass:"line-number"},[t._v("3")]),n("br"),n("span",{staticClass:"line-number"},[t._v("4")]),n("br"),n("span",{staticClass:"line-number"},[t._v("5")]),n("br"),n("span",{staticClass:"line-number"},[t._v("6")]),n("br"),n("span",{staticClass:"line-number"},[t._v("7")]),n("br"),n("span",{staticClass:"line-number"},[t._v("8")]),n("br"),n("span",{staticClass:"line-number"},[t._v("9")]),n("br"),n("span",{staticClass:"line-number"},[t._v("10")]),n("br"),n("span",{staticClass:"line-number"},[t._v("11")]),n("br"),n("span",{staticClass:"line-number"},[t._v("12")]),n("br"),n("span",{staticClass:"line-number"},[t._v("13")]),n("br"),n("span",{staticClass:"line-number"},[t._v("14")]),n("br"),n("span",{staticClass:"line-number"},[t._v("15")]),n("br"),n("span",{staticClass:"line-number"},[t._v("16")]),n("br"),n("span",{staticClass:"line-number"},[t._v("17")]),n("br"),n("span",{staticClass:"line-number"},[t._v("18")]),n("br"),n("span",{staticClass:"line-number"},[t._v("19")]),n("br"),n("span",{staticClass:"line-number"},[t._v("20")]),n("br"),n("span",{staticClass:"line-number"},[t._v("21")]),n("br"),n("span",{staticClass:"line-number"},[t._v("22")]),n("br")])])])},[],!1,null,null,null);s.default=e.exports}}]);