Created
June 15, 2011 18:14
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binding a button enable/disable to a backbone model
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| <form action="/login" id="login-form"> | |
| Username: <input type="text" id="username"><br> | |
| Password: <input type="password" id="password"><br> | |
| <button id="login" disabled="true">Login</button> | |
| </form> |
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| var Credentials = Backbone.Model.extend({ | |
| initialize: function(){ | |
| this.bind("change", this.attributesChanged); | |
| }, | |
| attributesChanged: function(){ | |
| var valid = false; | |
| if (this.get('username') && this.get('password')) | |
| valid = true; | |
| this.trigger("validated", valid); | |
| } | |
| }); |
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| var LoginView = Backbone.View.extend({ | |
| el: "#login-form", | |
| events: { | |
| "click #login": "performLogin", | |
| "change #username": "setUsername", | |
| "change #password": "setPassword" | |
| }, | |
| initialize: function(){ | |
| this.username = $("#username"); | |
| this.password = $("#password"); | |
| this.loginButton = $("#login"); | |
| this.model.view = this; | |
| this.model.bind("validated", this.validated); | |
| }, | |
| validated: function(valid){ | |
| if (valid){ | |
| this.view.loginButton.removeAttr("disabled"); | |
| } else { | |
| this.view.loginButton.attr("disabled", "true"); | |
| } | |
| }, | |
| setUsername: function(e){ | |
| this.model.set({username: this.username.val()}); | |
| }, | |
| setPassword: function(e){ | |
| this.model.set({password: this.password.val()}); | |
| }, | |
| performLogin: function(){ | |
| var user= this.model.get('username'); | |
| var pword = this.model.get('password'); | |
| alert("You logged in as " + user + " and a password of " + pword); | |
| return false; | |
| } | |
| }); |
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| $(function(){ | |
| var Credentials = Backbone.Model.extend({ | |
| initialize: function(){ | |
| this.bind("change", this.attributesChanged); | |
| }, | |
| attributesChanged: function(){ | |
| var valid = false; | |
| if (this.get('username') && this.get('password')) | |
| valid = true; | |
| this.trigger("validated", valid); | |
| } | |
| }); | |
| var LoginView = Backbone.View.extend({ | |
| el: "#login-form", | |
| events: { | |
| "click #login": "performLogin", | |
| "change #username": "setUsername", | |
| "change #password": "setPassword" | |
| }, | |
| initialize: function(){ | |
| this.username = $("#username"); | |
| this.password = $("#password"); | |
| this.loginButton = $("#login"); | |
| this.model.view = this; | |
| this.model.bind("validated", this.validated); | |
| }, | |
| validated: function(valid){ | |
| if (valid){ | |
| this.view.loginButton.removeAttr("disabled"); | |
| } else { | |
| this.view.loginButton.attr("disabled", "true"); | |
| } | |
| }, | |
| setUsername: function(e){ | |
| this.model.set({username: this.username.val()}); | |
| }, | |
| setPassword: function(e){ | |
| this.model.set({password: this.password.val()}); | |
| }, | |
| performLogin: function(){ | |
| var user= this.model.get('username'); | |
| var pword = this.model.get('password'); | |
| alert("You logged in as " + user + " and a password of " + pword); | |
| return false; | |
| } | |
| }); | |
| window.LoginView = new LoginView({model: new Credentials()}); | |
| }); |
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| <html> | |
| <head> | |
| <script src="jquery-1.6.1.min.js"></script> | |
| <script src="underscore-min.js"></script> | |
| <script src="backbone-min.js"></script> | |
| <script src="example.js"></script> | |
| </head> | |
| <body> | |
| <form action="/login" id="login-form"> | |
| Username: <input type="text" id="username"><br> | |
| Password: <input type="password" id="password"><br> | |
| <button id="login" disabled="true">Login</button> | |
| </form> | |
| </body> | |
| </html> |
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In case, if the user hasn't fill both user/pass, what would be the action. we need to throw error or need to highlight the element. how do you achieve that? and what is the good practice for that?