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Angular js Uncheck checkbox on cancel button click

<input type="checkbox" name="chk" ng-model="Crate" ng-click="crate('sm',$event)">
on model cancel
$scope.cancelC = function() {
console.log($scope.Crate);
}
//it showing false but not unchecking the checkbox

You have to specify the ng-value. You can use just ng-value="true" or other values, as string value ng-value="'now-this-is-a-string-value'".
angular.module('test', []).controller('TestController', function() {
var vm = this;
this.title = 'Test';
this.value = true;
this.toggle = function() {
vm.value = !vm.value;
};
});
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="test">
<div ng-controller="TestController as test">
{{ test.title }}
<input type="checkbox" name="chk" ng-model="test.value" ng-value="true" />
<button ng-click="test.toggle('sm',$event)">Toggle</button>
</div>
</div>

observable and computed are not working properly Knockout

I have the following knockout code that implements the folowing role:
field1 + field2 -field3 = field4
$(function () {
ko.applyBindings(new AppViewModel());
});
function AppViewModel() {
this.original = ko.observable(0);
this.improvements = ko.observable(0);
this.depreciation = ko.observable(0);
this.total= ko.computed(function () {
var total= 0;
total= this.original() + this.improvements() - this.depreciation();
return total;
}, this);
}
But for some reason it's not working properly, this.original is always multiplied by 10.
for example:
1 + 1 - 1 = 10
Any idea what can causes this?
This is my HTML:
<div class="calc-form">
<label>Original Purchase Price</label>
<input type="text" id="original" data-bind="value: original" />
<label>+ Improvements</label>
<input type="text" id="improvements" data-bind="value: improvements" />
<label>- Depreciation</label>
<input type="text" id="depreciation" data-bind="value: depreciation" />
<input type="button" class="calcbutton" value="Calculate" />
<input type="button" class="calcbuttonreset" value="reset" />
<p>= Total</p>
<span data-bind="text: total"></span>
</div>

Remember that the value of input elements is always a string. "1" + "1" - "1" is "11" - "1" is 10 because when either operand is a string, + is string concatenation, not addition; but - is always subtraction, so it coerces its operands to numbers.
You need to parse them, via +x or parseFloat(x) or Number(x) or (if they're meant to be whole numbers) parseInt(x, 10), etc.:
total = parseFloat(this.original())
+ parseFloat(this.improvements())
- parseFloat(this.depreciation());
Example:
$(function() {
ko.applyBindings(new AppViewModel());
});
function AppViewModel() {
this.original = ko.observable(0);
this.improvements = ko.observable(0);
this.depreciation = ko.observable(0);
this.total = ko.computed(function() {
var total = 0;
total = parseFloat(this.original())
+ parseFloat(this.improvements())
- parseFloat(this.depreciation());
return total;
}, this);
}
<div class="calc-form">
<label>Original Purchase Price</label>
<input type="text" id="original" data-bind="value: original" />
<label>+ Improvements</label>
<input type="text" id="improvements" data-bind="value: improvements" />
<label>- Depreciation</label>
<input type="text" id="depreciation" data-bind="value: depreciation" />
<input type="button" class="calcbutton" value="Calculate" />
<input type="button" class="calcbuttonreset" value="reset" />
<p>= Total</p>
<span data-bind="text: total"></span>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.2.0/knockout-min.js"></script>
If you're going to be working with numeric inputs a lot, you might want to give yourself a specific binding for them:
// "numValue" binding handler (just an example)
ko.bindingHandlers.numValue = {
init: function(element, valueAccessor) {
function numValueHandler() {
valueAccessor()(parseFloat(this.value));
}
$(element).on("input change", numValueHandler)
.val(ko.unwrap(valueAccessor()));
ko.utils.domNodeDisposal.addDisposeCallback(element, function() {
$(element).off("input change", numValueHandler);
});
},
update: function(element, valueAccessor) {
element.value = ko.unwrap(valueAccessor());
}
};
Then:
<input type="text" id="original" data-bind="numValue: original" />
<!-- ---------------------------------------^^^^^^^^ -->
// "numValue" binding handler (just an example)
ko.bindingHandlers.numValue = {
init: function(element, valueAccessor) {
function numValueHandler() {
valueAccessor()(parseFloat(this.value));
}
$(element).on("input change", numValueHandler)
.val(ko.unwrap(valueAccessor()));
ko.utils.domNodeDisposal.addDisposeCallback(element, function() {
$(element).off("input change", numValueHandler);
});
},
update: function(element, valueAccessor) {
element.value = ko.unwrap(valueAccessor());
}
};
$(function() {
ko.applyBindings(new AppViewModel());
});
function AppViewModel() {
this.original = ko.observable(0);
this.improvements = ko.observable(0);
this.depreciation = ko.observable(0);
this.total = ko.computed(function() {
var total = 0;
total = this.original() + this.improvements() - this.depreciation();
return total;
}, this);
}
<div class="calc-form">
<label>Original Purchase Price</label>
<input type="text" id="original" data-bind="numValue: original" />
<label>+ Improvements</label>
<input type="text" id="improvements" data-bind="numValue: improvements" />
<label>- Depreciation</label>
<input type="text" id="depreciation" data-bind="numValue: depreciation" />
<input type="button" class="calcbutton" value="Calculate" />
<input type="button" class="calcbuttonreset" value="reset" />
<p>= Total</p>
<span data-bind="text: total"></span>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.2.0/knockout-min.js"></script>

Creating a dynamic form with input buttons

I've tried many different methods, and even tried searching on SO. No answer was what I was looking for.
What I want is to have two input buttons that do some things in pure javascript.
Button one: Have it say "Add" when the page loads. When clicked, the value changes to "Cancel." Also, when it's clicked, have it display a form with three fields. When it's clicked again, have the form disappear. One named 'name', the second named 'location', the third named 'type'. I want the user to be able to submit these three things and have them be stored in the code.
Button two: Take the user input from the form and each time the user clicks, it displays all three information values, but have the button act as random generator. Let's say the code has 5 separate entries, I want them to be randomly selected and displayed when the button is clicked.
Like I said, I tried to make this work, but couldn't quite get over the top of where I wanted to go with it. If you want to see my original code, just ask, but I doubt it will be of any assistance.
Thanks in advance.
EDIT: Added the code.
function GetValue() {
var myarray = [];
var random = myarray[Math.floor(Math.random() * myarray.length)];
document.getElementById("message").innerHTML = random;
}
var testObject = {
'name': BWW,
'location': "Sesame Street",
'type': Bar
};
localStorage.setItem('testObject', JSON.stringify(testObject));
var retrievedObject = localStorage.getItem('testObject');
function change() {
var elem = document.getElementById("btnAdd1");
if (elem.value == "Add Spot") {
elem.value = "Cancel";
} else elem.value = "Add Spot";
}
window.onload = function() {
var button = document.getElementById('btnAdd1');
button.onclick = function show() {
var div = document.getElementById('order');
if (div.style.display !== 'none') {
div.style.display = 'none';
} else {
div.style.display = 'block';
}
};
};
<section>
<input type="button" id="btnChoose" value="Random Spot" onclick="GetValue();" />
<p id="message"></p>
<input type="button" id="btnAdd1" value="Add Spot" onclick="change();" />
<div class="form"></div>
<form id="order" style="display:none;">
<input type="text" name="name" placeholder="Name of Resturant" required="required" autocomplete="on" />
<input type="text" name="type" placeholder="Type of Food" required="required" autocomplete="off" />
<input type="text" name="location" placeholder="Location" required="required" autocomplete="off" />
<input type="submit" value="Add Spot" />
</form>
</div>
</section>
The randomizer works, and so does the appear/hide form. Only thing is storing the input and switching the input value.

Here's one way to do this. Each form submission is stored as an object in an array. The random button randomly selects an item from the array and displays it below.
HTML:
<section>
<input type="button" id="btnChoose" value="Random Spot" />
<p id="message"></p>
<input type="button" id="btnAdd1" value="Add Spot" />
<div class="form">
<form id="order" style="display:none;">
<input id="orderName" type="text" name="name" placeholder="Name of Resturant" required="required" autocomplete="on" />
<input id="orderType" type="text" name="type" placeholder="Type of Food" required="required" autocomplete="off" />
<input id="orderLocation" type="text" name="location" placeholder="Location" required="required" autocomplete="off" />
<input type="submit" value="Add Spot" />
</form>
</div>
</section>
<div id="randomName"></div>
<div id="randomLocation"></div>
<div id="randomType"></div>
JS:
var formData = [];
var formSubmission = function(name, location, type) {
this.name = name;
this.location = location;
this.type = type;
}
var spotName = document.getElementById("orderName"),
spotLocation = document.getElementById("orderLocation"),
spotType = document.getElementById("orderType");
var addClick = function() {
if (this.value === 'Add Spot') {
this.value = "Cancel";
document.getElementById('order').style.display = 'block';
}
else {
this.value = 'Add Spot';
document.getElementById('order').style.display = 'none';
}
}
document.getElementById("btnAdd1").onclick = addClick;
document.getElementById('order').onsubmit = function(e) {
e.preventDefault();
var submission = new formSubmission(spotName.value, spotLocation.value, spotType.value);
formData.push(submission);
submission = '';
document.getElementById('btnAdd1').value = 'Add Spot';
document.getElementById('order').style.display = 'none';
this.reset();
}
var randomValue;
document.getElementById('btnChoose').onclick = function() {
randomValue = formData[Math.floor(Math.random()*formData.length)];
document.getElementById('randomName').innerHTML = randomValue.name;
document.getElementById('randomLocation').innerHTML = randomValue.location;
document.getElementById('randomType').innerHTML = randomValue.type;
}

I was working on something since you first posted, and here is my take on it:
HTML:
<section>
<p id="message">
<div id="name"></div>
<div id="location"></div>
<div id="type"></div>
</p>
<input type="button" id="btnAdd" value="Add" onclick="doAdd(this);" />
<input type="button" id="btnShow" value="Show" onclick="doShow(this);" />
<div class="form">
<script id="myRowTemplate" type="text/template">
<input type="text" name="name" placeholder="Name of Resturant" required="required" autocomplete="on" onchange="onChanged(this, {{i}})" />
<input type="text" name="type" placeholder="Type of Food" required="required" autocomplete="off" onchange="onChanged(this, {{i}})" />
<input type="text" name="location" placeholder="Location" required="required" autocomplete="off" onchange="onChanged(this, {{i}})" />
</script>
<form id="order" style="display:none;">
<div id="formItems">
</div>
<input type="button" value="Add Spot" onclick="addSpot()" />
</form>
</div>
</section>
JS:
function GetValue() {
if (enteredItems.length) {
var entry = enteredItems[Math.floor(Math.random() * enteredItems.length)];
document.getElementById("name").innerHTML = entry.name;
document.getElementById("location").innerHTML = entry.location;
document.getElementById("type").innerHTML = entry.type;
}
}
function doAdd(elem) {
switch (elem.value) {
case "Add":
document.getElementById('order').style.display = "";
elem.value = "Cancel";
break;
case "Cancel":
document.getElementById('order').style.display = "none";
elem.value = "Add";
break;
}
}
function doShow(elem) {
GetValue();
}
function addSpot(index) { // (note: here, index is only for loading for the first time)
if (index == undefined) index = enteredItems.length;
var newRowDiv = document.createElement("div");
newRowDiv.innerHTML = document.getElementById("myRowTemplate").innerHTML.replace(/{{i}}/g, index); // (this updates the template with the entry in the array it belongs)
if (enteredItems[index] == undefined)
enteredItems[index] = { name: "", location: "", type: "" }; // (create new entry)
else {debugger;
newRowDiv.children[0].value = enteredItems[index].name;
newRowDiv.children[1].value = enteredItems[index].location;
newRowDiv.children[2].value = enteredItems[index].type;
}
document.getElementById("formItems").appendChild(newRowDiv);
}
function onChanged(elem, index) {
enteredItems[index][elem.name] = elem.value;
localStorage.setItem('enteredItems', JSON.stringify(enteredItems)); // (save each time
}
// update the UI with any saved items
var enteredItems = [];
window.addEventListener("load", function() {
var retrievedObject = localStorage.getItem('enteredItems');
if (retrievedObject)
enteredItems = retrievedObject = JSON.parse(retrievedObject);
for (var i = 0; i < enteredItems.length; ++i)
addSpot(i);
});
https://jsfiddle.net/k1vp8dqn/
It took me a bit longer because I noticed you were trying to save the items, so I whipped up something that you can play with to suit your needs.

KnockoutJS Remove dynamic bindings

I've managed to get a prototype working with the help of others to dynamically add new inputs and next to it that specific inputs settings. However I've been trying to get to grips how to remove what I've added dynamically. Any ideas?
HTML
<div class="input-row" data-bind="foreach: inputItems">
<div class="input-row-item">
<div>
<label data-bind="text: label"></label>
<input data-bind="attr:{ name: name, placeholder: placeholder, disabled: disabled() === 'true', value: value, type: type }">
</div>
<div>
<input type="text" class="nb-remove" data-bind="value: label" placeholder="input label">
<input type="text" value="text" class="nb-remove" data-bind="value: type" placeholder="input type">
<input type="text" class="nb-remove" data-bind="value: name" placeholder="input name">
<input type="text" class="nb-remove" data-bind="value: placeholder" placeholder="input placeholder">
<input type="text" class="nb-remove" data-bind="value: disabled" placeholder="input disabled">
<input type="text" class="nb-remove" data-bind="value: value" placeholder="input value">
</div>
<div>
<button data-bind="click: removeInput">Remove this</button>
</div>
</div>
</div>
THE JS
$(function(){
var InputItem = function InputItem(label, type, name, placeholder, disabled, value) {
this.label = ko.observable(label);
this.type = ko.observable(type);
this.name = ko.observable(name);
this.placeholder = ko.observable(placeholder);
this.disabled = ko.observable(disabled);
this.value = ko.observable(value);
}
var ViewModel = function ViewModel() {
var that = this;
this.inputItems = ko.observableArray([]);
this.addInput = function addInput() {
that.inputItems.push(new InputItem());
};
this.removeInput = function removeInput(){
//remove input here
}
}
ko.applyBindings(new ViewModel());
});

You should try something like this
View Model:
var ViewModel = function() {
var that = this;
that.inputItems = ko.observableArray([new InputItem()]);
that.addInput = function () {
that.inputItems.push(new InputItem());
};
that.removeInput = function (item){
that.inputItems.remove(item);
}
}
ko.applyBindings(new ViewModel());
Working fiddle here
Few Suggestions:
1) As you assigned var that=this you try to use that consistently across vm
2) You can create a function name simply like this var fun=function() else you can just do like this function fun(){//blah blah}

Knockout.js unable to update server database

The following is my single page app using Knockout.js and MVC WebApi. I have no problem getting the data from WebApi service. However, I can't neither do a PUT nor a POST to the server. When I click the Update button which is bound to self.update(), it always says "baseApiUri/api/user/undefined". I thought the self.user(new userViewModel(user)) line would set the scope of the current user record, but it doesn't seem to be the case. I'd like to use the userViewModel instead of hard code the getting and setting of each of the properties in the user observable object. Thank you for your help.
#model App4MVC4.Controllers.UserViewModel
#section scripts{
<script type="text/javascript">
function viewModel() {
var baseApiUri = "#Model.apiBaseUrl";
var self = this;
/********** nested view model **********/
function userViewModel(user) {
var self = this;
self.user_ID = user.user_ID;
self.firstName = user.firstName;
self.lastName = user.lastName;
self.long_name = ko.computed(function(){return self.firstName + " " + self.lastName});
self.Login = user.Login;
self.dateAdded = user.dateAdded;
self.email = user.email;
self.alertOptIn = user.alertOptIn ? "Yes" : "No";
self.active = user.active ? "Yes" : "No";
}
/********** properties **********/
self.newUser = ko.observable();
self.userBeforeEdit = ko.observable();
self.users = ko.observableArray();
self.user = ko.observable();
self.operationStatus = ko.observable();
/********** methods **********/
// create new user (HttpPost)
self.create = function (formElement) {
self.operationStatus("Creating ...");
$(formElement).validate();
if ($(formElement).valid()) {
$.post(baseApiUri + "/api/user", $(formElement).serialize(), null, "json")
.done(function (o) {
self.users.push(o);
})
.fail(function (xhr, textStatus, err) {
self.operationStatus(err);
});
}
}
self.cancelAdd = function () {
self.newUser(new userViewModel());
}
}
// instantiate the above ViewModel and apply Knockout binding
ko.applyBindings(new viewModel());
// make jQuery tabs
$("#tabs").tabs();
</script>
}
<div id="tabs">
<ul>
<li>User Detail</li>
<li>New User</li>
</ul>
<div id="addNewTab">
<form>
<div>
<label for="firstNameNew">First Name</label>
<input type="text" title="First Name" data-bind="value:newUser.firstName"/>
</div>
<div>
<label for="lastNameNew">Last Name</label>
<input type="text" title="Last Name" data-bind="value: newUser.lastName"/>
</div>
<div>
<label for="fullNameNew">Full Name</label>
<input type="text" title="Full Name" data-bind="value: newUser.long_Name"/>
</div>
<div>
<label for="loginNew">Login</label>
<input type="text" title="Login" data-bind="value: newUser.Login"/>
</div>
<div>
<label for="emailNew">Email</label>
<input type="text" title="Email" data-bind="value: newUser.email"/>
</div>
<div>
<label for="emailAlertNew">Email Alert</label>
<span><input data-bind="checked: newUser.alertOptIn" type="radio" title="Send Email Alert" value="Yes" name="alertOptIn"/>Yes</span>
<span><input data-bind="checked: newUser.alertOptIn" type="radio" title="No Email Alert" value="No" name="alertOptIn"/>No</span>
</div>
<div>
<input type="button" value="Save" data-bind="click: create" />
<input type="button" value="Cancel" data-bind="click: cancelAdd" />
<p data-bind="text: operationStatus" class="status"></p>
</div>
</form>
</div>
</div>

you missed parentheses when retrieving a value for user here:
url: baseApiUri + "/api/user/" + self.user().user_ID