How to save select state in url with Ember.js?

Question

How to save select state in url with Ember.js?

121 views Asked by Victor Bornov At 23 November 2024 at 23:35

I implement content filter with ember.js and I need to save filter state in URL. How can I do this?

I reed this section http://guides.emberjs.com/v1.12.0/routing/query-params/ and try to do that code http://output.jsbin.com/cixama/4 But choice saved in URL as

http://output.jsbin.com/cixama/4#/?pull=undefined

Why undefined?

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Dynamic select on Ember.js</title>
  <script src="https://code.jquery.com/jquery-2.1.1.min.js"></script>
  <script src="http://builds.emberjs.com/release/ember-template-compiler.js"></script>
  <script src="http://builds.emberjs.com/release/ember.min.js"></script>
  <script src="http://builds.emberjs.com/tags/v1.0.0-beta.18/ember-data.prod.js"></script>
</head>
<body>
  <script type="text/x-handlebars" id="index">
    <form>
      {{view "select" content=model
                      optionValuePath="content.number"
                      optionLabelPath="content.title"
                      value=pull
                      prompt="Choice option"}}
    </form>
  </script>
<script id="jsbin-javascript">
App = Ember.Application.create({});

// ROUTES
App.IndexRoute = Ember.Route.extend({
  model: function() {
    return Ember.$.getJSON('https://api.github.com/repos/emberjs/ember.js/pulls');
  }
});

// CONTROLLERS
App.IndexController = Ember.Controller.extend({
  queryParams: ['pull'],
  pull: null,
});
</script>



<script id="jsbin-source-javascript" type="text/javascript">App = Ember.Application.create({});

// ROUTES
App.IndexRoute = Ember.Route.extend({
  model: function() {
    return Ember.$.getJSON('https://api.github.com/repos/emberjs/ember.js/pulls');
  }
});

// CONTROLLERS
App.IndexController = Ember.Controller.extend({
  queryParams: ['pull'],
  pull: null,
});</script></body>
</html>

Original Q&A

There are 1 answers

**Andrey Mikhaylov - lolmaus** · Accepted Answer · 2015-06-09 10:43:24

Your problem is that the number property of the payload is an integer, while the query param is a string.

When you select an item from the dropdown, a numeric value gets written into the pull property. But the query params mechanism replaces it with a string. The dropdown sees the value changed, looks up a new value and finds nothing. It assumes that no value was chosen and sets pull to undefined.

One solution is to use two properties: one will store the original numeric value, the other will be a getter/setter computed property that would convert between numeric and text.

<form>
  {{view "select" content=model
                  optionValuePath="content.number"
                  optionLabelPath="content.title"
                  value=currentPull
                  prompt="Choice option"}}
</form>

<p>currentPull: {{currentPull}}</p>

App.IndexController = Ember.Controller.extend({
  queryParams: ['pull'],
  pull:        Ember.computed('currentPull', {
    get: function() {
      return this.get('currentPull');
    },
    set: function(key, value) {
      this.set('currentPull', parseInt(value, 10));
      return value;
    },
  }),

  currentPull: null,
});

Demo: http://output.jsbin.com/redefi/2

But a better solution would be to introduce a model layer into your app. You'd have a pull-request entity with its attributes corresponding to properties of the payload. Then you can handle the number↔text conversion in the serializer, and your business logic will stay concise and expressive.

TechQA.

How to save select state in url with Ember.js?

There are 1 answers

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