js 双向绑定
//双向绑定实例 <input name="" ng-bind-123="name" /> function DataBinder( object_id ) { // Create a simple PubSub object var pubSub = { callbacks: {}, on: function( msg, callback ) { this.callbacks[ msg ] = this.callbacks[ msg ] || []; this.callbacks[ msg ].push( callback ); }, publish: function( msg ) { this.callbacks[ msg ] = this.callbacks[ msg ] || [] for ( var i = 0, len = this.callbacks[ msg ].length; i < len; i++ ) { this.callbacks[ msg ][ i ].apply( this, arguments ); } } }, data_attr = "ng-bind-" + object_id, message = object_id + ":keyup", changeHandler = function( evt ) { var target = evt.target || evt.srcElement, // IE8 compatibility prop_name = target.getAttribute( data_attr ); if ( prop_name && prop_name !== "" ) { pubSub.publish( message, prop_name, target.value ); } }; // Listen to change events and proxy to PubSub if ( document.addEventListener ) { document.addEventListener( "keyup", changeHandler, false ); } else { // IE8 uses attachEvent instead of addEventListener document.attachEvent( "onkeyup", changeHandler ); } // PubSub propagates changes to all bound elements pubSub.on( message, function( evt, prop_name, new_val ) { var elements = document.querySelectorAll("[" + data_attr + "=" + prop_name + "]"), tag_name; for ( var i = 0, len = elements.length; i < len; i++ ) { tag_name = elements[ i ].tagName.toLowerCase(); if ( tag_name === "input" || tag_name === "textarea" || tag_name === "select" ) { elements[ i ].value = new_val; } else { elements[ i ].innerHTML = new_val; } } }); return pubSub; } function User( uid ) { // ... var binder = new DataBinder( uid ), user = { // ... attributes: {}, set: function( attr_name, val ) { this.attributes[ attr_name ] = val; // Use the `publish` method binder.publish( uid + ":keyup", attr_name, val, this ); }, get: function( attr_name ) { return this.attributes[ attr_name ]; } } binder.on( uid + ":keyup", function( evt, attr_name, new_val, initiator ) { if ( initiator !== user ) { user.set( attr_name, new_val ); } }); return user; } // javascript var user = new User( ‘test‘); user.set( "name", "binding" );
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