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Commite0339ac

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Add AJS Storage Priority Config
1 parent9d45e35 commite0339ac

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‎src/connections/sources/catalog/libraries/website/javascript/cookie-validity-update.md‎

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@@ -139,3 +139,38 @@ To access or assign a value to a cookie outside of the standard Segment methods
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|`user traits`|`ajs_user_traits`|`analytics.user().traits();`|`window.localStorage.ajs_user_traits`|`analytics.user().traits({firstName:'Jane'});`|`analytics.user().traits({});`|
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|`groupId`|`ajs_group_id`|`analytics.group().id();`|`window.localStorage.ajs_group_id`|`analytics.group().id('777-qwe-098');`|`analytics.group().id('');`|
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|`group traits`|`ajs_group_properties`|`analytics.group().traits()`|`window.localStorage.ajs_group_properties`|`analytics.group().traits({name:'Segment'})`|`analytics.group().traits({})`|
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##Storage Priority
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By default Analytics.js uses`localStorage` as its preferred storage location, with Cookies as a fallback when`localStorage` is not available or not populated. An in-memory storage is used as a last fallback if all the previous ones are disabled.
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Default Storage Priority:
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```md
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LocalStorage -> Cookie -> InMemory
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```
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Some scenarios might require to switch the priority of the storage systems.
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- Apps that move the user across different subdomains
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- Apps where the server needs control over the user data
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- User Consent
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- Availability
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The storage priority can be configured in the Analytics.js client using the`storage` property either globally or only for user or group data.
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The`storage` property accepts an array of supported storage names (`localStorage`,`cookie`,`memory`) to be used in the priority order of the array.
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```js
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analytics.load('writeKey', {
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// Global Storage Priority: Both User and Group data
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storage: ['cookie','localStorage','memory']
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// Specific Storage Priority
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user: {
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storage: ['cookie','localStorage','memory']
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},
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group: {
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storage: ['cookie','localStorage','memory']
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},
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}
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```

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