vuex-asr/docs/.vuepress/dist/assets/js/25.3f626a44.js

* Version: 0.7.52 * License M.I.T. * [Online Documentation](https://vuex-asr.github.io/vuex-asr/) * author: Joris Wenting * email: vuex.asr@gmail.com * [linkedIn](https://www.linkedin.com/in/joriswenting/). * [contribute](https://vuex-asr.github.io/vuex-a

(window.webpackJsonp=window.webpackJsonp||[]).push([[25],{234:function(t,a,s){"use strict";s.r(a);var n=s(0),e=Object(n.a)({},(function(){var t=this,a=t.$createElement,s=t._self._c||a;return s("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[s("h1",{attrs:{id:"actions"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#actions","aria-hidden":"true"}},[t._v("#")]),t._v(" actions")]),t._v(" "),s("p",[t._v("Vuex offers a great way to mutate state items with the use of mutations and actions. Vuex-asr enables you to bind those actions and mutations the same way you could bind "),s("router-link",{attrs:{to:"/step-by-step-guide/hello-world-example.html"}},[t._v("state")]),t._v(" and "),s("router-link",{attrs:{to:"/step-by-step-guide/getters-example.html"}},[t._v("getters")]),t._v(" by the component's attributes. In this chapter we discuss the use of actions.")],1),t._v(" "),s("div",{staticClass:"tip custom-block"},[s("p",{staticClass:"custom-block-title"},[t._v("codesandbox")]),t._v(" "),s("p",[s("a",{attrs:{href:"https://codesandbox.io/s/manual-actions-lzo6z",target:"_blank",rel:"noopener noreferrer"}},[t._v("actions"),s("OutboundLink")],1)])]),t._v(" "),s("h2",{attrs:{id:"vuex-actions-in-a-nutshell"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#vuex-actions-in-a-nutshell","aria-hidden":"true"}},[t._v("#")]),t._v(" vuex actions in a nutshell")]),t._v(" "),s("p",[t._v("Actions are methods in the store used for asynchronous interaction of data, typically triggered by an event, like fetching data from an API and "),s("code",[t._v("commit")]),t._v(" the received data as a mutation to mutate the state. You could make multiple commits in an action and you have access to all of the state and mutations in the store (and it's namespaces).")]),t._v(" "),s("div",{staticClass:"tip custom-block"},[s("p",{staticClass:"custom-block-title"},[t._v("TIP")]),t._v(" "),s("p",[t._v("Keeping track of mutations (e.g. triggered by actions) is very handy for debugging. It's recommended to download the "),s("a",{attrs:{href:"https://chrome.google.com/webstore/detail/vuejs-devtools/nhdogjmejiglipccpnnnanhbledajbpd",target:"_blank",rel:"noopener noreferrer"}},[t._v("vue.js devtools"),s("OutboundLink")],1),t._v(" for chrome. If you go to the "),s("code",[t._v("Vuex")]),t._v(" tab in it you'll see your mutations and state.")])]),t._v(" "),s("p",[t._v("You could read more about actions in the "),s("a",{attrs:{href:"https://vuex.vuejs.org/guide/actions.html",target:"_blank",rel:"noopener noreferrer"}},[t._v("vuex guide/actions"),s("OutboundLink")],1),t._v(".")]),t._v(" "),s("h2",{attrs:{id:"when-to-use-a-mutation-or-an-action"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#when-to-use-a-mutation-or-an-action","aria-hidden":"true"}},[t._v("#")]),t._v(" when to use a mutation or an action")]),t._v(" "),s("p",[t._v("This convention could help you to decide to use mutations or actions:")]),t._v(" "),s("ul",[s("li",[t._v("if you are updating a "),s("strong",[t._v("single")]),t._v(" state item, you could use a mutation, but more elegantly it would be to create an action that commits a mutation.")]),t._v(" "),s("li",[t._v("If you have to update "),s("strong",[t._v("multiple")]),t._v(" state items or have an asynchronous procedure in one method you should always use an action.")])]),t._v(" "),s("h2",{attrs:{id:"the-store"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#the-store","aria-hidden":"true"}},[t._v("#")]),t._v(" the store")]),t._v(" "),s("p",[t._v("Let's take a look at the following store,")]),t._v(" "),s("div",{staticClass:"language-js extra-class"},[s("div",{staticClass:"highlight-lines"},[s("br"),s("br"),s("br"),s("br"),s("div",{staticClass:"highlighted"},[t._v(" ")]),s("br"),s("br"),s("div",{staticClass:"highlighted"},[t._v(" ")]),s("div",{staticClass:"highlighted"},[t._v(" ")]),s("div",{staticClass:"highlighted"},[t._v(" ")]),s("div",{staticClass:"highlighted"},[t._v(" ")]),s("br"),s("br"),s("div",{staticClass:"highlighted"},[t._v(" ")]),s("div",{staticClass:"highlighted"},[t._v(" ")]),s("div",{staticClass:"highlighted"},[t._v(" ")]),s("div",{staticClass:"highlighted"},[t._v(" ")]),s("div",{staticClass:"highlighted"},[t._v(" ")]),s("div",{staticClass:"highlighted"},[t._v(" ")]),s("br"),s("br"),s("br")]),s("pre",{pre:!0,attrs:{class:"language-js"}},[s("code",[s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// src/vuex/store.js")]),t._v("\n\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("export")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("default")]),t._v(" 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punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("setMessage")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token parameter"}},[t._v("state"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" message")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n      console"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("log")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"message was mutated with: "')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" message"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n      state"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("message "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" message"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n  "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n  actions"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("setMessageAsync")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token parameter"}},[s("span",{pre:!0,attrs:{class:"token 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function"}},[t._v("commit")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"setMessage"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" event"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("target"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("value"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n      "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("1000")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n  "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),s("p",[t._v("We have an action "),s("code",[t._v("setMessageAsync")]),t._v(" that delays 1 sec (to simulate async behaviour) before committing the mutation "),s("code",[t._v("setMessage")]),t._v(".")]),t._v(" "),s("h2",{attrs:{id:"creating-a-two-way-binding-with-a-state-item-and-an-action"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#creating-a-two-way-binding-with-a-state-item-and-an-action","aria-hidden":"true"}},[t._v("#")]),t._v(" creating a two way binding with a state item and an action")]),t._v(" "),s("p",[t._v("We bind a state item and an action to a component")]),t._v(" "),s("div",{staticClass:"language-vue extra-class"},[s("div",{staticClass:"highlight-lines"},[s("br"),s("br"),s("br"),s("br"),s("br"),s("div",{staticClass:"highlighted"},[t._v(" ")]),s("div",{staticClass:"highlighted"},[t._v(" ")]),s("br"),s("br"),s("br"),s("br"),s("br"),s("br")]),s("pre",{pre:!0,attrs:{class:"language-vue"}},[s("code",[t._v(" // src/App.vue\n \n "),s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),t._v("template")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v(" \n \n  "),s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),t._v("example-component-with-event-handler")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("asr-bind-state")]),s("span",{pre:!0,attrs:{class:"token attr-value"}},[s("span",{pre:!0,attrs:{class:"token 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"),s("code",[t._v("message")]),t._v(" and method "),s("code",[t._v("setMessage")]),t._v(" available:\n(note that the component below is still the same component we used in the mutations example)")]),t._v(" "),s("div",{staticClass:"language-vue extra-class"},[s("div",{staticClass:"highlight-lines"},[s("br"),s("br"),s("br"),s("br"),s("div",{staticClass:"highlighted"},[t._v(" ")]),s("br"),s("br"),s("br")]),s("pre",{pre:!0,attrs:{class:"language-vue"}},[s("code",[t._v("// src/components/ExampleMessageWithEventHandler.vue\n\n"),s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),t._v("template")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),t._v("p")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token 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extra-class"},[s("div",{staticClass:"highlight-lines"},[s("br"),s("br"),s("div",{staticClass:"highlighted"},[t._v(" ")]),s("br"),s("br"),s("div",{staticClass:"highlighted"},[t._v(" ")]),s("div",{staticClass:"highlighted"},[t._v(" ")]),s("div",{staticClass:"highlighted"},[t._v(" ")]),s("div",{staticClass:"highlighted"},[t._v(" ")]),s("br"),s("br"),s("div",{staticClass:"highlighted"},[t._v(" ")]),s("div",{staticClass:"highlighted"},[t._v(" ")]),s("div",{staticClass:"highlighted"},[t._v(" ")]),s("div",{staticClass:"highlighted"},[t._v(" ")]),s("br"),s("br"),s("br")]),s("pre",{pre:!0,attrs:{class:"language-js"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("export")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("default")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("new")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Vuex"),s("span",{pre:!0,attrs:{class:"token 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