javascript - Dojo MVC 的简单登录实现

Question

有没有关于如何实现简单登录页面/对话框的示例？我一直在尝试用 dojo 样板来做(查看我之前的问题:Layout implementation for Dojo MVC)。到目前为止，我已经能够显示我的对话框。但是我希望能够获取我的数据，并且在点击事件时想要有一个警告框(例如他的内容)。

我的看法:

<form action="Login" method="post" validate="true" id="loginForm">
  <table width="258">
    &nbsp;
    <tr>
      <td><label>Login</label></td>
      <td><input class="cell" type="text" trim="true" dojoType="dijit.form.TextBox" value="" name="login" id="userId"/></td>
    </tr>
    <tr>
      <td><label>Password</label></td>
      <td><input class="cell" type="password" trim="true" dojoType="dijit.form.TextBox" value="" name="password" id="password"/></td>
    </tr>
    <tr><td colspan="2">&nbsp;</td></tr>
    <tr>
      <td colspan="2" align="center">
      <table border="0" cellspacing="0" cellpadding="0">
          <tr>
            <td align="center" valign="top"><button dojoType="dijit.form.Button" type="submit" id="LoginButton" onClick="connect">Ok</button></td>
            &nbsp;
            <td align="left" valign="top"><button dojoType="dijit.form.Button" type="submit" onclick="document.Login.reset()" id="Cancel">Cancel</button></td>
            &nbsp;
            <td><button dojoType="dijit.form.Button" type="submit" onclick="showDialog();" id="resetPassword"> Show Dialog </button></td>
          </tr>
     </table>
     &nbsp;
     </td>
    </tr>
  </table>
</form>

我的小部件模块/类

define([
    "dojo/_base/declare",
    "dijit/_Widget",
    "dijit/_TemplatedMixin",
    "dijit/_WidgetsInTemplateMixin",
    "dojo/text!app/views/Login/Login.html",
    "dijit/Dialog",
    "dijit/form/Button",
    "dijit/form/TextBox"
], function(
    declare,
    _Widget,
    _TemplatedMixin, 
    _WidgetsInTemplateMixin,
    template,
    Dialog
){
    return declare([_Widget, _TemplatedMixin, _WidgetsInTemplateMixin, Dialog], {

        templateString: template
    });
});

现在，如果您检查 HTML，元素 ID LoginButton 应该在这种情况下调用“连接”函数。哪个应该显示(在警告框中)当前输入的用户名和密码。

我的函数放在哪里？有点……

    connect : function(){
    alert("username :" + dom.byId("userId").value() 
+ "  Password: " + dom.byId("password").value());
    }

编辑:新代码

define([
    "dojo/_base/declare",
    "dijit/_Widget",
    "dojo/dom",
    "dijit/_TemplatedMixin",
    "dijit/_WidgetsInTemplateMixin",
    "dojo/text!app/views/Login/Login.html",
    "dijit/Dialog",
    "dijit/form/Button",
    "dijit/form/TextBox"
], function(
    declare,
    dom,
    _Widget,
    _TemplatedMixin, 
    _WidgetsInTemplateMixin,
    template,
    Dialog
){
    return declare("login", [_Widget, _TemplatedMixin, _WidgetsInTemplateMixin, Dialog], {

        templateString: template,

        postCreate: function() {
           this.inherited(arguments);
           // make reference to widget from the node attachment
           this.submitButton = dijit.getEnclosingWidget(this.submitButtonNode);
           // override its onSubmit
           this.submitButton.onClick = function(){
             alert("username :" + dom.byId("userId").value() 
                 + "  Password: " + dom.byId("password").value());
           };
        },
        // and a sample on how to implement widget-in-template stateful get/setter pattern
        // e.g. if submitbutton label should change on some event, call as such:
        // dijit.byId('loginForm').set("submitLabel", "Sendin login, please wait");
        _setSubmitLabelAttr : function(value) {
            return this.submitButton.set("label", value);
        },
        _getSubmitLabelAttr : function() {
            return this.submitButton.get("label");
        },
    });
});

我的 main.js:

define([ 'dojo/has', 'require', 'dojo/_base/sniff'], function (has, require) {
    var app = {};

    if (has('host-browser')) {

        require([ './views/Login', 'dojo/domReady!' ], function (Login) {
            app.login = new Login().placeAt(document.body);

            app.login.startup();

            // And now…
            app.login.show();
        });
    }
    else {
        console.log('Hello from the server!');
    }
});

Answer 1

我想添加我的解决方案:http://jsfiddle.net/phusick/tG8Sg/

由于 jsFiddle 的限制，它有点扭曲，但主要原则与我在编码中采用的相同。

首先，登录过程(或任何其他表单处理)被封装在对话框中，它与应用程序的其余部分进行通信，以为通过 dojo/Evented 发出事件。 .这是它的工作原理:

var loginDialog = new LoginDialog({ controller: loginController});
loginDialog.startup();
loginDialog.show();

loginDialog.on("cancel", function() {
    console.log("Login cancelled.");        
});

loginDialog.on("error", function() { 
    console.log("Login error.");
});

loginDialog.on("success", function() { 
    console.log("Login success.");
    console.log(JSON.stringify(this.form.get("value")));
});

正如您在 jsFiddle 中所见，我在 LoginDialog 中组装了两个模板 dialog-template 和 login-form-template构造函数。原因是我通常也会有一个类包装 dijit/form/Form做一些超出标准的魔法dijit/form/Form验证和数据序列化，但由于登录很简单，而且在 jsFiddle 的单个文件中会很乱，所以我摆脱了它。将表单与对话框分开的优点是您可以在其他地方使用相同的表单(即 View)和所有表单临时代码，例如在ContentPane .表单只是用来向用户显示和收集数据，它不应该直接与 Model 通信，即网络服务，有一个 Controller 用于此目的:

var LoginController = declare(null, {

    constructor: function(kwArgs) {
        lang.mixin(this, kwArgs);
    },

    login: function(data) {
        // simulate calling web service for authentication
        var def = new Deferred();
        setTimeout(lang.hitch(this, function() {
            def.resolve(data.username == this.username && data.password == this.password);                
        }), 1000);
        return def;
    }
});

创建 LoginController 的实例:

// provide username & password in the constructor
// since we do not have web service here to authenticate against    
var loginController = new LoginController({username: "user", password: "user"});

并将其传递给 LoginDialog构造函数如上所示:

var loginDialog = new LoginDialog({ controller: loginController});

最后LoginDialog类:

var LoginDialog = declare([Dialog, Evented], {

    READY: 0,
    BUSY: 1,

    title: "Login Dialog",
    message: "",
    busyLabel: "Working...",

    // Binding property values to DOM nodes in templates
    // see: http://www.enterprisedojo.com/2010/10/02/lessons-in-widgetry-binding-property-values-to-dom-nodes-in-templates/
    attributeMap: lang.delegate(dijit._Widget.prototype.attributeMap, {
        message: {
            node: "messageNode",
            type: "innerHTML"               
        }            
    }),

    constructor: function(/*Object*/ kwArgs) {
        lang.mixin(this, kwArgs);            
        var dialogTemplate = dom.byId("dialog-template").textContent; 
        var formTemplate = dom.byId("login-form-template").textContent;
        var template = lang.replace(dialogTemplate, {
            form: formTemplate                
        });

        var contentWidget = new (declare(
            [_Widget, _TemplatedMixin, _WidgetsInTemplateMixin],
            {
                templateString: template                   
            }
        )); 
        contentWidget.startup();
        var content = this.content = contentWidget;
        this.form = content.form;
        // shortcuts
        this.submitButton = content.submitButton;
        this.cancelButton = content.cancelButton;
        this.messageNode = content.messageNode;
    },

    postCreate: function() {
        this.inherited(arguments);

        this.readyState= this.READY;
        this.okLabel = this.submitButton.get("label");

        this.connect(this.submitButton, "onClick", "onSubmit");
        this.connect(this.cancelButton, "onClick", "onCancel");

        this.watch("readyState", lang.hitch(this, "_onReadyStateChange"));

        this.form.watch("state", lang.hitch(this, "_onValidStateChange"));
        this._onValidStateChange();
    },

    onSubmit: function() {
        this.set("readyState", this.BUSY);
        this.set("message", ""); 
        var data = this.form.get("value");

        // ask the controller to login
        var auth = this.controller.login(data);

        Deferred.when(auth, lang.hitch(this, function(loginSuccess) {
            if (loginSuccess === true) {
                this.onLoginSuccess();
                return;                    
            }
            this.onLoginError();
        }));
    },

    onLoginSuccess: function() {
        this.set("readyState", this.READY);            
        this.emit("success");
    },

    onLoginError: function() {
        this.set("readyState", this.READY);
        this.set("message", "Please try again."); 
        this.emit("error");         
    },

    onCancel: function() {
       this.emit("cancel");     
    },

    _onValidStateChange: function() {
        this.submitButton.set("disabled", !!this.form.get("state").length);
    },

    _onReadyStateChange: function() {
        var isBusy = this.get("readyState") == this.BUSY;
        this.submitButton.set("label", isBusy ? this.busyLabel : this.okLabel);
        this.submitButton.set("disabled", isBusy);
    }            
});

请参阅上述 jsFiddle 处的模板.它们应该在单独的文件中 required通过dojo/text!通常情况下。我把它们放入 <script type="text/template">以适应 jsFiddle。