1 2 <!--- 3 4 This README is automatically generated from the comments in these files: 5 iron-meta.html 6 7 Edit those files, and our readme bot will duplicate them over here! 8 Edit this file, and the bot will squash your changes :) 9 10 --> 11 12 [](https://travis-ci.org/PolymerElements/iron-meta) 13 14 _[Demo and API Docs](https://elements.polymer-project.org/elements/iron-meta)_ 15 16 17 ##<iron-meta> 18 19 20 `iron-meta` is a generic element you can use for sharing information across the DOM tree. 21 It uses [monostate pattern](http://c2.com/cgi/wiki?MonostatePattern) such that any 22 instance of iron-meta has access to the shared 23 information. You can use `iron-meta` to share whatever you want (or create an extension 24 [like x-meta] for enhancements). 25 26 The `iron-meta` instances containing your actual data can be loaded in an import, 27 or constructed in any way you see fit. The only requirement is that you create them 28 before you try to access them. 29 30 Examples: 31 32 If I create an instance like this: 33 34 <iron-meta key="info" value="foo/bar"></iron-meta> 35 36 Note that value="foo/bar" is the metadata I've defined. I could define more 37 attributes or use child nodes to define additional metadata. 38 39 Now I can access that element (and it's metadata) from any iron-meta instance 40 via the byKey method, e.g. 41 42 meta.byKey('info').getAttribute('value'); 43 44 Pure imperative form would be like: 45 46 document.createElement('iron-meta').byKey('info').getAttribute('value'); 47 48 Or, in a Polymer element, you can include a meta in your template: 49 50 <iron-meta id="meta"></iron-meta> 51 ... 52 this.$.meta.byKey('info').getAttribute('value'); 53 54 55 56 ##<iron-meta-query> 57 58 59 `iron-meta` is a generic element you can use for sharing information across the DOM tree. 60 It uses [monostate pattern](http://c2.com/cgi/wiki?MonostatePattern) such that any 61 instance of iron-meta has access to the shared 62 information. You can use `iron-meta` to share whatever you want (or create an extension 63 [like x-meta] for enhancements). 64 65 The `iron-meta` instances containing your actual data can be loaded in an import, 66 or constructed in any way you see fit. The only requirement is that you create them 67 before you try to access them. 68 69 Examples: 70 71 If I create an instance like this: 72 73 <iron-meta key="info" value="foo/bar"></iron-meta> 74 75 Note that value="foo/bar" is the metadata I've defined. I could define more 76 attributes or use child nodes to define additional metadata. 77 78 Now I can access that element (and it's metadata) from any iron-meta instance 79 via the byKey method, e.g. 80 81 meta.byKey('info').getAttribute('value'); 82 83 Pure imperative form would be like: 84 85 document.createElement('iron-meta').byKey('info').getAttribute('value'); 86 87 Or, in a Polymer element, you can include a meta in your template: 88 89 <iron-meta id="meta"></iron-meta> 90 ... 91 this.$.meta.byKey('info').getAttribute('value'); 92 93 94
