Created
June 15, 2011 18:14
-
-
Save mxriverlynn/1027710 to your computer and use it in GitHub Desktop.
binding a button enable/disable to a backbone model
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <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> |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| 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); | |
| } | |
| }); |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| 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; | |
| } | |
| }); |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| $(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()}); | |
| }); |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <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> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
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?