I am trying to save the data from the text-boxes to the localStorage using knockout JS! However I am new and not able to figure out this particular scenario. The field has same observable name! Please find my code below.
HTML Code:
<form data-bind="foreach: trialData">
<input type="text" name="name" data-bind="textInput: myData"><br>
</form>
JS Code:
var dataModel = {
myData: ko.observable('new'),
dataTemplate: function (myData) {
var self = this;
self.myData = ko.observable(myData);
}
};
dataModel.collectedNotes = function () {
var self = this;
self.trialData = ko.observableArray([]);
for (var i=0; i<5; i++) {
self.trialData.push (new dataModel.dataTemplate());
}
};
dataModel.collectedNotes();
ko.applyBindings(dataModel);
Traget: The data entered inside the text-boxes should be available in localStorage.
You need to define a Handler function to read the data from the Textboxes and save it to the localstorage. You need to reference the Data which is bound to the click event, which can be accessed using the first parameter. Knockout passes the data and event information as 2 arguments to the click handler function. So, you can add the event handler to your viewModel using the click binding and then unwrap the value and save it to localStorage.
saveToLocalStorage : function(data){
var datatoStore = JSON.stringify(data.trialData().map(x=>x.myData()));
console.log(datatoStore);
localStorage.setItem("TextBoxValue", datatoStore);
}
Complete Code: Please note since this is a sandboxed environment (Running this js Snippet on StackOverflow), localStorage wouldn't work, but it should work in your code. I have added a line in console to get the value to Store.
var dataModel = {
myData: ko.observable('new'),
dataTemplate: function (myData) {
var self = this;
self.myData = ko.observable(myData);
},
saveToLocalStorage : function(data){
var datatoStore = JSON.stringify(data.trialData().map(x=>x.myData()));
console.log(datatoStore);
localStorage.setItem("TextBoxValue", datatoStore);
}
};
dataModel.collectedNotes = function () {
var self = this;
self.trialData = ko.observableArray([]);
for (var i=0; i<5; i++) {
self.trialData.push (new dataModel.dataTemplate());
}
};
dataModel.collectedNotes();
ko.applyBindings(dataModel);
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.2/knockout-min.js"></script>
<form data-bind="foreach: trialData">
<input type="text" name="name" data-bind="textInput: myData"><br>
</form>
<button data-bind="click:saveToLocalStorage">Save To local storage</button>
Related
I am fairly new to knockout and trying to figure out why the following won't work. For some reason my returned data from the ajax call is not being translated into an array.
I have a function that returns some JSON
bankingApi.client = (function () {
var getSafeFloatCash= function getSafeFloatCash() {
return $.ajax({
url: '/BackOffice/Banking/Banking/GetSafeFloat',
type: 'GET'
});
}
return {
getSafeFloatCash : getSafeFloatCash
};
})();
The function returns the following JSON:
[{"Denomination":"1p","Value":34.1200},{"Denomination":"2p","Value":98.0400},{"Denomination":"5p","Value":85.0500},{"Denomination":"10p","Value":571.2000},{"Denomination":"20p","Value":62.8000},{"Denomination":"50p","Value":57.5000},{"Denomination":"£1","Value":441.0000},{"Denomination":"£2","Value":398.0000},{"Denomination":"£5","Value":260.0000},{"Denomination":"£10","Value":320.0000},{"Denomination":"£20","Value":780.0000},{"Denomination":"£50","Value":350.0000}]
I set up my observable array
(function () {
var BankingViewModel = function () {
var self = this;
self.safeFloatDenominations = ko.observableArray();
var safeFloatCash = bankingApi.client.getSafeFloatCash();
self.safeFloatDenominations(safeFloatCash); // does not work!
self.safeTopUpValue = ko.computed(function () {
var total = self.floatRecommendedValue - self.safeFloatTotal;
return total.toFixed(0);
});
}
$(document).ready(function () {
var viewModel = new BankingViewModel();
ko.applyBindings(viewModel);
});
})();
If I paste the values returned from the ajax call into an array variable it works fine, so there is some issue translating the function call into an array.
and this is the view
<div class="row" data-bind="visible: safeTopUpValue()>0, foreach: safeFloatDenominations">
<div class="col-xs-5">
<input type="text" data-bind="value: Value" />
<label data-bind="text: Denomination"></label>
</div>
Building on my comment, $.ajax doesn't return data - it returns a promise. You need to use that to actually get the data out:
var safeFloatCash = bankingApi.client.getSafeFloatCash();
safeFloatCash.done(function(d) {
//may need to parse the data:
//d = JSON.parse(d);
self.safeFloatDenominations(d);
});
I am new to knockout. For my problem, I am trying to make it so that for each project, there is a button and textarea. The textarea will be hidden upon page load. If I click the button, it will show the textarea (toggle). Currently, if I click the button, ALL textareas on the page will show, rather than just the corresponding textarea.
I'm hoping the fix for this isn't too dramatic and involving a complete reworking of my code as by some magic, every other functionality has been working thus far. I added the {attr id: guid} (guid is a unique identifier of a project retrieved from the database) statement in an attempt to establish a unique ID so that the right controls were triggered...although that did not work.
Sorry I do not have a working jfiddle to show the issue... I tried to create one but it does not demonstrate the issue.
JS:
//if a cookie exists, extract the data and bind the page with cookie data
if (getCookie('filterCookie')) {
filterCookie = getCookie('filterCookie');
var cookieArray = filterCookie.split(",");
console.log(cookieArray);
$(function () {
var checkboxes = new Array();
for (var i = 0; i < cookieArray.length; i++) {
console.log(i + cookieArray[i]);
checkboxes.push(getCheckboxByValue(cookieArray[i]));
//checkboxes.push(document.querySelectorAll('input[value="' + cookieArray[i] + '"]'));
console.log(checkboxes);
checkboxes[i].checked = true;
}
})
filterCookie = getCookie('filterResultsCookie');
cookieArray = filterCookie.split(",");
filterCookieObj = {};
filterCookieObj.action = "updateProjects";
filterCookieObj.list = cookieArray;
$.ajax("/api/project/", {
type: "POST",
data: JSON.stringify(filterCookieObj)
}).done(function (response) {
proj = response;
ko.cleanNode(c2[0]);
c2.html(original);
ko.applyBindings(new ProjectViewModel(proj), c2[0]);
});
}
//if the cookie doesn't exist, just bind the page
else {
$.ajax("/api/project/", {
type: "POST",
data: JSON.stringify({
action: "getProjects"
})
}).done(function (response) {
proj = response;
ko.cleanNode(c2[0]);
c2.html(original);
ko.applyBindings(new ProjectViewModel(proj), c2[0]);
});
}
View Model:
function ProjectViewModel(proj) {
//console.log(proj);
var self = this;
self.projects = ko.observableArray(proj);
self.show = ko.observable(false);
self.toggleTextArea = function () {
self.show(!self.show());
};
};
HTML:
<!-- ko foreach: projects -->
<div id="eachOppyProject" style="border-bottom: 1px solid #eee;">
<table>
<tbody>
<tr>
<td><a data-bind="attr: { href: '/tools/oppy/' + guid }" style="font-size: 25px;"><span class="link" data-bind=" value: guid, text: name"></span></a></td>
</tr>
<tr data-bind="text: projectDescription"></tr>
<%-- <tr data-bind="text: guid"></tr>--%>
</tbody>
</table>
<span class="forminputtitle">Have you done project this before?</span> <input type="button" value="Yes" data-bind="click: $parent.toggleTextArea" class="btnOppy"/>
<textarea placeholder="Tell us a little of what you've done." data-bind="visible: $parent.show, attr: {'id': guid }" class="form-control newSessionAnalyst" style="height:75px; " /><br />
<span> <input type="checkbox" name="oppyDoProjectAgain" style="padding-top:10px; padding-right:20px;">I'm thinking about doing this again. </span>
<br />
</div><br />
<!-- /ko -->
Spencer:
function ProjectViewModel(proj) {
//console.log(proj);
var self = this;
self.projects = ko.observableArray(proj);
self.projects().forEach(function() { //also tried proj.forEach(function())
self.projects().showComments = ko.observable(false);
self.projects().toggleComments = function () {
self.showComments(!self.showComments());
};
})
};
It's weird that
data-bind="visible: show"
doesn't provide any binding error because context of binding inside ko foreach: project is project not the ProjectViewModel.
Anyway, this solution should solve your problem:
function ViewModel() {
var self = this;
var wrappedProjects = proj.map(function(p) {
return new Project(p);
});
self.projects = ko.observableArray(wrappedProjects);
}
function Project(proj) {
var self = proj;
self.show = ko.observable(false);
self.toggleTextArea = function () {
self.show(!self.show());
}
return self;
}
The problem is that the show observable needs to be defined in the projects array. Currently all the textareas are looking at the same observable. This means you'll have to move the function showTextArea into the projects array as well.
Also you may want to consider renaming your function or getting rid of it entirely. Function names which imply they drive a change directly to the view fly in the face of the MVVM pattern. I'd recommend a name like "toggleComments" as it doesn't reference a view control.
EDIT:
As an example:
function ProjectViewModel(proj) {
//console.log(proj);
var self = this;
self.projects = ko.observableArray(proj);
foreach(var project in self.projects()) {
project.showComments = ko.observable(false);
project.toggleComments = function () {
self.showComments(!self.showComments());
};
}
};
There is probably a much cleaner way to implement this in your project I just wanted to demonstrate my meaning without making a ton of changes to the code you provided.
I am trying to update some radio buttons with knockout js. I retrieve the data from an ajax call similar to this example. Everything works well so far. Data is retrieved and passed to the model. And even the List is generated.
The problem is that jquery is not "skining" the radio list. (Upper part on the image)
Working with a parsed JSON-String everything works fine. (Lower part on the image)
Any ideas?
Thanks
Code:
HTML
<fieldset id="myList" data-role="controlgroup" data-bind="foreach: myVals">
<label data-bind="text:$data, attr: { for:'vals'+$data}"></label>
<input type="radio" data-bind="checked:$root.selectedVals, value:$data ,attr: {name: 'list', id:'vals'+$data}" >
</fieldset>...
JavaScript
// Knockout
function viewModel() {
self = this;
self.myVals = ko.observableArray();
self.selectedVals = ko.observable();
}
var vm = new viewModel();
ko.applyBindings(vm);
// Jquery
$(document).on("pageinit", "#myPage", function() {
$("#autocomplete").on("filterablebeforefilter", function(e, data) {
var $input = $(data.input), value = $input.val();
if (value && value.length > 2) {
$.ajax({
... get data
})
.then(function(response) {
vm.myVals.removeAll(); // clear so results won't add
$.each(response, function(i, val) {
vm.myVals.push(val); // fill Array
});
});
}
});
});
...
I'm writing a small application in JS and I decided to use Knockout.
Everything work well except from a single value that is not printed correctly and I don't understand why.
This is the html view where error appends (viaggio.arrivo is not visualized, and in place of correct value appears a function code like this "function c(){if(0 <arguments.length){if ..." and so on)
<input data-bind="value: viaggio.arrivo" />
And this is the javascript View Model.
Code is pretty long so I put it in a jsFiddle.
function ViewModel() {
function Viaggiatore(nome, cognome, eta, citta) {
var self = this;
self.nome = nome; self.cognome = cognome;
self.eta = ko.observable(eta);
self.citta = ko.observable(citta);
}
function Viaggio(viaggiatore, partenza, arrivo, mete) {
var self = this;
self.viaggiatore = ko.computed(viaggiatore);
self.partenza = ko.computed(partenza);
self.arrivo = ko.observable(arrivo);
self.mete = ko.computed(mete);
}
self.viaggiatore = new Viaggiatore("Mario", "Rossi", 35, "Como");
self.viaggio = new Viaggio(
function(){ return self.viaggiatore.nome+" "+self.viaggiatore.cognome; },
function(){ return self.viaggiatore.citta; },
"Roma",
function(){ return "mete" ;}
);
}
ko.applyBindings(new ViewModel());
I think you need brackets on one of your parameters, like so:
<p data-bind="text: viaggio.partenza()"></p>
Check out the updated fiddle: http://jsfiddle.net/mGDwy/2/
I'm trying to bind a 1-many mapping using KnockoutJS, where 1 zip code can have many 'agents'. I have the following classes:
function CaseAssignmentZipCode(zipcode, agent) {
var self = this;
self.zipcode = ko.observable(zipcode);
self.agent = ko.observable(agent);
}
function Agent(id, name) {
var self = this;
self.id = id;
self.name = name;
}
function ZipcodeAgentsViewModel() {
var self = this;
self.caseAssignmentZipCodes = ko.observableArray([]);
self.agents = ko.observableArray([]);
jdata = $.parseJSON($('#Agents').val());
var mappedAgents = $.map(jdata, function (a) { return new Agent(a.Id, a.Name) });
self.agents(mappedAgents);
var dictAgents = {};
$.each(mappedAgents, function (index, element) {
dictAgents[element.id] = element;
});
var jdata = $.parseJSON($('#CaseAssignmentZipCodes').val());
var mappedZipcodeAgents = $.map(jdata, function (za) { return new CaseAssignmentZipCode(za.ZipCode, dictAgents[za.UserId], false) });
self.caseAssignmentZipCodes(mappedZipcodeAgents);
}
var vm = new ZipcodeAgentsViewModel()
ko.applyBindings(vm);
My bindings look like this:
<table>
<thead><tr><th>Zipcode Agents</th></tr></thead>
<tbody data-bind="foreach: caseAssignmentZipCodes">
<tr>
<td><input data-bind="value: zipcode"></td>
<td><select data-bind="options: $root.agents, value: agent, optionsText: 'name'"></select></td>
<td>Remove</td>
</tr>
</tbody>
</table>
Everything binds fine the first time, with the table and select fields appearing properly. However, nothing happens when I change the selected value on any of the select elements. I have bound other elements to them and these don't update, and I've tried using .subscribe() to listen for the update event, but this doesn't fire either.
I expect there's something wrong with the way I'm setting up/binding these relationships, but I can't figure it out to save my life.
Thanks!
I think you need to add
self.agents = ko.observableArray([]);
at the top of ZipcodeUsersViewModel