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POBackbonejs collection.create: how to prevent it from adding items if there is an error?
 

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  1. POBackbonejs collection.create: how to prevent it from adding items if there is an error?
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    <p>How can I prevent <code>collection.create</code> from adding items into its collection if there is an error found in the input?</p> <p>html,</p> <pre><code>&lt;div id="new-status"&gt; &lt;h2&gt;New monolog&lt;/h2&gt; &lt;form action=""&gt; &lt;textarea name="content"&gt;&lt;/textarea&gt;&lt;br&gt; &lt;input type="submit" value="Post"&gt; &lt;/form&gt; &lt;/div&gt; &lt;div id="statuses"&gt; &lt;h2&gt;Monologs&lt;/h2&gt; &lt;ul&gt;&lt;/ul&gt; &lt;/div&gt; </code></pre> <p>backbone,</p> <pre><code>var Status = Backbone.Model.extend({ initialize: function(){ }, validate: function(attrs, options) { if(attrs.text === '') alert("please enter some text"); }, url:"dummy.php", sync: function (method, model, options) { return $.ajax({ type: "POST", dataType: 'json', url: 'server.php', data: { text: this.get("text") } }); } }); var Statuses = Backbone.Collection.extend({ model: Status }); var NewStatusView = Backbone.View.extend({ events: { "submit form": "addStatus" }, initialize: function(options) { _.bindAll(this, 'addStatus', 'clearInput'); this.listenTo(this.collection, 'add', this.clearInput) ; }, addStatus: function(e) { e.preventDefault(); this.collection.create({ text: this.$('textarea').val() }); }, clearInput: function() { this.$('textarea').val(''); } }); var StatusesView = Backbone.View.extend({ initialize: function(options) { this.collection.on("add", this.appendStatus, this); }, appendStatus: function(status) { this.$('ul').append('&lt;li&gt;' + status.escape("text") + '&lt;/li&gt;'); } }); $(document).ready(function() { var statuses = new Statuses(); new NewStatusView({ el: $('#new-status'), collection: statuses }); new StatusesView({ el: $('#statuses'), collection: statuses }); }); </code></pre> <p>So, when you hit the submit button without typing any text, you get an error popup from this part in the model,</p> <pre><code>validate: function(attrs, options) { if(attrs.text === '') alert("please enter some text"); }, </code></pre> <p>But how can I <strong>tell the collection</strong> that there is an error and <strong>do not add</strong> this empty item and also <strong>do not fire</strong> <code>sync</code> in the model?</p> <p><strong>EDIT:</strong></p> <p>got it worked with <code>collection.create</code> in this way...</p> <p>model,</p> <pre><code>validate: function(attrs, options) { if(attrs.text === '') { var message = "please enter some text"; alert(message); return message; } }, </code></pre> <p>view,</p> <pre><code>addStatus: function(e) { e.preventDefault(); var one = new Status({ text: this.$('textarea').val() }); if (!one.isValid()) { alert(one.validationError); } else { this.collection.create(one); } }, </code></pre> <p>it seems to work fine unless it is not a good approach or against MVC pattern?</p>
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    1. COYou should `return` the error and listen to `invalid` event.
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    2. COhow can i return the error and listen?
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    3. COBy using `return` keyword, if your don't return the error the validation doesn't validate the Model properly, the error is passed to the `invalid` handler, there you can `alert` it.
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