Created
December 12, 2012 23:48
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This is an example of using knockout.js with Lift to create a form. It allows you to utilize all of knockout's form capabilities combined with Lift's built-in ajax callbacks. AnonFunc is used to create a JavaScript function that is passed to the view model and called when the form is submitted.
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| (function(window) { | |
| window.app = { | |
| KoForm: function(saveFunc) { | |
| var self = this; | |
| self.name = ko.observable(""); | |
| self.formJson = function() { | |
| return {"name": self.name()}; | |
| }; | |
| self.save = function() { | |
| console.log("save called. name: "+self.name()); | |
| // call the save function passed in | |
| saveFunc(); | |
| }; | |
| self.afterSave = function(name) { | |
| console.log("afterSave called. name: "+name); | |
| }; | |
| } | |
| }; | |
| })(this); |
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| <html> | |
| <body> | |
| <div id="ko-form" data-lift="KoForm.form"> | |
| <form data-bind="submit: save"> | |
| <input data-bind="value: name" /> | |
| <button type="submit">Submit</button> | |
| </form> | |
| <script id="onload"></script> | |
| </div> | |
| <script src="app.js"></script> <!-- plus knockout --> | |
| </body> | |
| </html> |
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| package code.snippet | |
| import net.liftweb._ | |
| import http.js._ | |
| import http.js.JE._ | |
| import http.js.JsCmds._ | |
| import http.json._ | |
| import util.Helpers._ | |
| object KoForm { | |
| def form = { | |
| def save(jv: JValue): JsCmd = { | |
| logger.debug("json: "+pretty(render(jv))) | |
| val name = tryo((jv \ "name").extract[String]) openOr "" | |
| Call("window.koForm.afterSave", name) | |
| } | |
| val saveFunc: JsExp = AnonFunc(SHtml.jsonCall(Call("window.koForm.formJson"), save _)) | |
| val onLoad = | |
| SetExp( | |
| JsVar("window.koForm"), | |
| CallNew("app.KoForm", saveFunc) | |
| ) & | |
| Call("ko.applyBindings", JsVar("window.koForm"), Call("document.getElementById", "ko-form")) | |
| "#id_onload" #> Script(OnLoad(onLoad)) | |
| } | |
| } |
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