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Refresh attribute value after html() with ajax

I am making start/pause button that works like this:
var btns = document.querySelectorAll(".repairToggle");
for (i = 0; i < btns.length; i++) {
btns[i].addEventListener("click", manageOrderStatus);
}
function manageOrderStatus() {
var func = this.getAttribute("func");
var btn = this;
var endpoint = "{% url 'mtn:ajax_repair_toggle' %}";
$.ajax({
url: endpoint,
type: "GET",
data: {
'func': func,
},
success: function (data) {
$(btn).html(data);
}
});
}
I have start and stop buttons stored in separate html files:
work_order_start.html:
<div type="button" class="repairToggle" func="start">
<svg>...</svg>
</div>
work_order_pause.html:
<div type="button" class="repairToggle" func="stop">
<svg>...</svg>
</div>
In view i render one of the buttons based on the value of func attribute:
def repair_toggle(request):
...
func = request.GET.get('func')
if func == 'stop':
return render(request, 'mtn/work_order_start.html')
else:
return render(request, 'mtn/work_order_pause.html')
The problem is it only works once. After the first click it keeps executing ajax call but it sends the same old func value in request. How do i fix that?
UPDATE:
I figured out the problem. $(btn).html(data); only replaces the svg element. So the func stays the same. If i do this instead:
<div type="button" class="repairToggle">
<svg id='funcButton' func="stop">
</div>
How do i get func out of svg. I tried this.getElementById('funcButton').getAttribute("func"); but it doesn't work.

You are inserting the button inside the original button.
Change work_order_pause.html and work_order_start.html to only contain the svg and add in success function :
if(func == "start"){
this.setAttribute("func", "stop")
}
else{
this.setAttribute("func", "start")
}

I would like to show an error message after a user clicks on a save button if the URL they entered was invalid. Using Angular JS

I would like to show an error message AFTER a user clicks on a save button. The field that they need to complete is a URL link and it must be a valid url.. I have a working regex in place, I just have no clue how this is supposed to be done as I am very new to angular.
Here is what I have so far:
<div class="form-group">
<button type="button" class="btn btn-primary btn-block btn-lg"
ng-click="save()">
<spring:message code="journalist.social.submit.label"/>
<span class="glyphicon glyphicon-chevron-right"</span>
</button>
<span style="color: #d2232a;padding-left: 0px" class="btn"
ng-show="!canSave()">
<spring:message code="journalist.info.error.fill.all"/>
</span>
And in my scripts (The save button only works if the canSave function is true):
$scope.save = function () {
var res = [];
var files = [];
var ind = 0;
if ($scope.canSave()){ //save button should only work if the URL is valid
$scope.linkList.forEach(function (clip) {
if (!clip.link) {
return;
}
if (!CommonUtils.startsWithHttp(clip.link)) {
clip.link = CommonUtils.EMPTY_LINK + clip.link;
}
if (clip.imgData && clip.imgData.input) {
files.push({id: ind, file: clip.imgData.input, cropData: clip.imgData.cropData})
clip.logos = undefined;
}
ind = ind + 1;
res.push({
id: clip.id,
title: clip.title,
description: clip.description,
name: clip.name,
link: clip.link,
ordering: ind,
logoUrl: clip.logos ? clip.logos[clip.logoInd] : null
})
});
Journalist.updateClips(
files,
res,
$scope,
function (e) {
$scope.warningOnLocationChange = false;
Navigation.open($scope, ["journalist", "profile", "profile"]);
}
);
};
$scope.showUpload = function (clip) {
if(clip.link) {
clip.showUpload = true;
}
};
}}]
);
If you think the condition I have in my script for the save() function is not right then by all means tell me otherwise. How can I show an alert after the button is clicked? The alert shows before a URL is even entered (or as they are typing and will go away once the url is correct.) Thanks!

Why won't JS / JQuery read the text box values?

I have looked all over for a reason behind why this code does not work and I am stumped.
I have an ASPX page with C# code behind. The HTML mark-up has a JQuery dialog that functions properly. When the submit button is clicked the dialog closes and the data is passed to a web exposed method and is written to the database. All values are saved for the ddl and chkbox controls but the string value of the text box is empty. The database is set to NOT NULL for the field the text box is populating and the data is being saved so I know data is being passed but it is not the value entered into the text box.
The text box ID is txtCategoryName and the Client ID mode is set to static. I have tried to get the values using the following:
var CategoryName = $('#txtCategoryName').val();
var CategoryName = $('#txtCategoryName').text();
var CategoryName = $(document.getElementById('txtCategoryName')).text();
var CategoryName = $(document.getElementById('txtCategoryName')).val();
var CategoryName = document.getElementById('txtCategoryName').value;
All of these return the same blank field. I tried them one at a time.
Currently I am using this JS Code:
$(document).ready(function () {
var CategoryDialog = $(".EditCategories");
var BtnNew = $("#btnNew");
var CatDDL = document.getElementById("ddlCategoryParent3");
var CatChk = $("#chkCatActive").val();
var CategoryID = 0;
var CategoryName = $("#txtCategoryName").val();
var ParentID = CatDDL.options[CatDDL.selectedIndex].value;
if (CatChk) { CatChk = 1; } else { CatChk = 0; }
var CatDialog = $(CategoryDialog.dialog({
maxHeight: 1000,
closeOnEscape: true,
scrollable: false,
width: 650,
title: 'Category Editor',
autoOpen: false,
buttons: [
{
width: 170,
text: "Save",
icons: {
primary: "ui-icon-disk"
},
click: function () {
$(this).dialog("close");
window.alert(PageMethods.saveCat(CategoryName, ParentID, CategoryID, CatChk));
}
},
{
width: 170,
text: "Delete",
icons: {
primary: "ui-icon-circle-minus"
},
click: function () {
$(this).dialog("close");
}
},
{
width: 170,
text: "Cancel",
icons: {
primary: "ui-icon-circle-close"
},
click: function () {
$(this).dialog("close");
}
}
]
})
);
BtnNew.click(function () {
$(CatDialog).dialog('open');
$(CatDialog).parent().appendTo($("form:first"));
});
});
The code markup for the aspx page (categories.aspx)
<div class="EditCategories">
<div class="Table">
<div class="TableRow">
<div class="TableCell">
<div class="TextBlock220">Category Name </div>
</div><!-- End Table Cell -->
<div class="TableCell">
<input id="txtCategoryName" class="ControlTextBox" />
<!--<asp:TextBox ID="txtCategoryName" CssClass="ControlTextBox" runat="server" ClientIDMode="Static"></asp:TextBox>-->
</div><!--End Table Cell-->
</div><!-- End Row 1 -->
<div class="TableRow">
<div class="TableCell">
Parent Category
</div><!-- End Table Cell -->
<div class="TableCell">
<asp:DropDownList ID="ddlCategoryParent3" runat="server" CssClass="ControlDropDownList" ClientIDMode="Static"></asp:DropDownList>
</div><!--End Table Cell-->
</div>
<div class="TableRow">
<div class="TableCell">
Active
</div><!-- End Table Cell -->
<div class="TableCell">
<asp:Checkbox ID="chkCatActive" CssClass="ControlCheckBox" runat="server" ClientIDMode="Static"></asp:Checkbox>
</div><!--End Table Cell-->
</div><!-- End Row 3-->
</div>
</div>
The C# Code behind method for the ASPX page:
[System.Web.Services.WebMethod()]
[System.Web.Script.Services.ScriptMethod()]
public static string saveCat(string _Name_, int _parent_id_, int ID, int _Status_)
{
Category eCT = new Category();
eCT.CategoryName = _Name_;
eCT.ParentID = _parent_id_;
eCT.ID = ID;
eCT.Status = _Status_;
eCT.Save();
return eCT.resultMessage;
}
And the save method:
/// <summary>
/// If the ID = 0 the data is written as a new category.
/// If the ID is greater than 0 the data is updated.
/// </summary>
/// <returns>The objects result value will hold the result of the attempt to update data as type Boolean. The objects resultMessage value will contain the string result of the attempt to add data.</returns>
public void Save()
{
result = dl.CategoryExists(this);
if (result) { resultMessage = "The parent category already contains a category named " + CategoryName.Trim(); }
else {
if (ID > 0)
{
if (!result) { resultMessage = "There was an unexpected error updating " + CategoryName.Trim() + ". No changes were saved."; }
}
else
{
result = dl.InsertCategory(this);
if (!result) { resultMessage = "There was an unexpected error creating the Category."; }
}
}
if (result) { resultMessage = "New Category Successfully Created"; }
}
Any help is greatly appreciated thanks.

The issue here is you're attempting to get the value right as soon as the page loads, before the input field gets filled out. Place this code inside the button click function:
var CategoryName = document.getElementById('txtCategoryName').value;
and it should work for you. If not, let us know.
Your code should look something like this:
click: function () {
// note: CategoryID not used yet.
var CategoryName = $("#txtCategoryName").val();
var CatChk = $("#chkCatActive").val();
var CatDDL = document.getElementById("ddlCategoryParent3")
var ParentID = CatDDL.options[CatDDL.selectedIndex].value;
if (CatChk) { CatChk = 1; } else { CatChk = 0; }
$(this).dialog("close");
window.alert(PageMethods.saveCat(CategoryName, ParentID, CategoryID, CatChk));
}

You are fetching the values from your dialog at page startup time BEFORE they have been edited.
It looks like this:
var CategoryName = $("#txtCategoryName").val();
is run at page startup time before the page has been edited. This will fetch the default value for the input field and will never reflect any editing that is done on the page. The line of code above does not create a "live" connection with the input field on the page. It just gets the value at the time that line of code is run and from then on there is no connection to any edits made to the field.
I would think you want to fetch the value only later when you actually need to value for something. In general, you do not want to cache a value like this because the cached value gets out of sync with what is in the actual field on the page. Just fetch it at the very moment that you need it for something and it will never have a stale value.
If the place that you're using this value is inside the dialog click handler, then fetch it there so you are getting the latest value:
click: function () {
$(this).dialog("close");
var CatChk = $("#chkCatActive").val() ? 1 : 0;
var CategoryName = $("#txtCategoryName").val();
var CatDDL = document.getElementById("ddlCategoryParent3");
var ParentID = CatDDL.options[CatDDL.selectedIndex].value;
window.alert(PageMethods.saveCat(categoryName, ParentID, CategoryID, CatChk));
}

Knockout bindings not working as expected for manipulating observable array

We have a view using Razor and Knockout.js that displays a form. Part of the form asks the user to enter a list of values, and we're using a ko.observablearray to keep track of them. This list is represented as a bunch of text boxes, one per value, with a "Delete" button next to each box and a single "Add" button underneath all of them. It works similarly to the demo project at http://learn.knockoutjs.com/#/?tutorial=collections.
Our form is acting unexpectedly in two ways:
When a delete button is clicked, it removes all values from the ko.observablearray, not just the one corresponding to what was clicked.
When the "Submit" button for the overall form is clicked, it adds a new element to the ko.observablearray instead of submitting the form to our server.
Why are we seeing this behavior? (I know that these are two separate issues, but I'm not sure if they're caused by the same underlying problem or not, which is why I'm posting them in one question.)
Here is our Razor view:
#model OurProject.Models.Input.InputModel
#{
ViewBag.Title = "Input";
}
<h2>Inputs</h2>
<div id="inputForm">
<!-- snip - lots of input elements to fill in that are bound to KO -->
<div>
#Html.LabelFor(model => model.POSTransactionCodes)
</div>
<div>
<span class="help-block">Separate values by commas.</span>
</div>
<div>
<ul data-bind="foreach: POSTransactionCodes">
<li><input data-bind="value: $data" /> Delete</li>
</ul>
<button data-bind="click: addPOSTransactionCode">Add another POS Transaction Code</button>
#Html.ValidationMessageFor(model => model.POSTransactionCodes, null, new { #class = "help-inline" })
</div>
<!-- snip - more input elements -->
<button data-bind="click: save">Submit</button>
</div>
<script type="text/javascript" src='~/Scripts/jquery-1.8.2.min.js'></script>
<script type="text/javascript" src='~/Scripts/knockout-2.1.0.js'></script>
<script type="text/javascript" src='~/Scripts/OP/OP.js'></script>
<script type="text/javascript" src='~/Scripts/OP/Input/OP.Input.Input.Form.js'></script>
<script type="text/javascript" src='~/Scripts/OP/Input/OP.Input.Input.Data.js'></script>
<script type="text/javascript">
var elementToBindTo = $("#inputForm")[0];
OP.Input.Input.Form.init(elementToBindTo);
</script>
Here is our main piece of Knockout code, OP.Input.Input.Form.js:
extend(OP, 'OP.Input.Input.Form');
OP.Input.Input.Form = function (jQuery) {
//The ViewModel for the page
var ViewModel = function () {
var self = this;
//Fields
/* snip - lots of ko.observables() */
self.POSTransactionCodes = ko.observableArray([]); //is a list of transaction codes
/* snip - lots of ko.observables() */
//Set up with initial data
self.initialize = function () {
var c = function (data, status, response) {
if (status === "success") {
/* snip - lots of ko.observables() */
ko.utils.arrayPushAll(self.POSTransactionCodes, data.POSTransactionCodes);
self.POSTransactionCodes.valueHasMutated();
/* snip - lots of ko.observables() */
} else {
}
};
OP.Input.Input.Data.GetInput(c);
}
//When saving, submit data to server
self.save = function (model) {
var c = function (data, status, response) {
if (status === "success") {
//After succesfully submitting input data, go to /Input/Submitted
//in order to let MVC determine where to send the user next
window.location.href = "~/Input/Submitted";
} else {
}
};
OP.Input.Input.Data.SaveInput(model, c);
}
//Modifying POSTransactionCodes array
self.removePOSTransactionCode = function (POScode) {
self.POSTransactionCodes.remove(POScode)
}
self.addPOSTransactionCode = function () {
self.POSTransactionCodes.push("");
}
};
//Connect KO form to HTML
return {
init: function (elToBind) {
var model = new ViewModel();
ko.applyBindings(model, elToBind);
model.initialize();
}
};
} ($);
Here is OP.Input.Input.Data.js:
extend(OP, 'OP.Input.Input.Data');
OP.Input.Input.Data = {
GetInput: function (callback) {
$.get("/API/Input/InputAPI/GetInputModel", callback);
},
SaveInput: function (input, callback) {
$.ajax({
url: "/API/Input/InputAPI/SaveInput",
type: "post",
data: input,
complete: callback
});
}
};

You need to be pushing a new ViewModel into your observable array. Which will contain observable properties.
So to do this I created a new view model called TransactionCodeView
var TransactionCodeView = function() {
var self = this;
self.code = ko.observable("");
};
Then when the user clicks "Add another POS Transaction Code":
self.addPOSTransactionCode = function () {
self.POSTransactionCodes.push(new TransactionCodeView());
}
The only other thing changed was in the HTML binding:
<li><input data-bind="value: code" /> Delete</li>
Because code is the observable property in the new viewmodel we bind the input value to that.
Take a look at this jsfiddle. I haven't tested the submit functionality for obvious reasons ;-)

This is why the submit functionality wasn't working on my form:
In the view, I had this Razor:
<div>
<ul data-bind="foreach: POSTransactionCodes">
<li><input data-bind="value: $data" /> Delete</li>
</ul>
<button data-bind="click: addPOSTransactionCode">Add another POS Transaction Code</button>
#Html.ValidationMessageFor(model => model.POSTransactionCodes, null, new { #class = "help-inline" })
</div>
Using the button element for my "Add" button was causing it to respond to the user pressing enter instead of the submit button at the end of the form. When I changed the button into an input element instead, it started working as expected.
<input type="button" value="Add another POS Transaction Code"
data-bind="click: addPOSTransactionCode" />

knockout.js - deferred databinding for modal?

I am using knockout.js to display a list of employees. I have a single hidden modal markup on the page. When the "details" button for a single employees is clicked, I want to data-bind that employee to the modal popup. I am using the ko.applyBindings(employee, element) but the problem is when the page loads, it is expecting the modal to start off as bound to something.
So I'm wondering, is there a trick/strategy to do a late/deferred databinding? I looked into virtual bindings but the documentation was not helpful enough.
Thanks!

I would like to propose a different way to work with modals in MVVVM. In MVVM, the ViewModel is data for the View, and the View is responsible for the UI. If we examine this proposal:
this.detailedEmployee = ko.observable({}),
var self = this;
this.showDetails = function(employee){
self.detailedEmployee(employee);
$("#dialog").dialog("show"); //or however your dialog works
}
I strongly agree with this.detailedEmployee = ko.observable({}), but I am in strong disagreement with this line: $("#dialog").dialog("show");. This code is placed in the ViewModel and shows the modal window, wherein fact it is View's responsibility, so we screw-up the MVVM approach. I would say this piece of code will solve your current task but it could cause lots of problems in future.
When closing the popup, you should set detailedEmployee to undefined to have your main ViewModel in a consistent state.
When closing the popup, you might want to have validation and the possibility to discard the close operation when you want to use another modal's component in the application
As for me, these points are very critical, so I would like to propose a different way. If we "forget" that you need to display data in popup, binding with could solve your issue.
this.detailedEmployee = ko.observable(undefined);
var self = this;
this.showDetails = function(employee){
self.detailedEmployee(employee);
}
<div data-bind="with: detailedEmployee">
Data to show
</div>
As you can see, your ViewModel don't know anything about how data should be shown. It knows only about data that should be shown. The with binding will display content only when detailedEmployee is defined. Next, we should find a binding similar to with but one that will display content in the popup. Let's give it the name modal. Its code is like this:
ko.bindingHandlers['modal'] = {
init: function(element) {
$(element).modal('init');
return ko.bindingHandlers['with'].init.apply(this, arguments);
},
update: function(element, valueAccessor) {
var value = ko.utils.unwrapObservable(valueAccessor());
var returnValue = ko.bindingHandlers['with'].update.apply(this, arguments);
if (value) {
$(element).modal('show');
} else {
$(element).modal('hide');
}
return returnValue;
}
};
As you can see, it uses the with plugin internally, and shows or hide a popup depending on value passed to binding. If it is defined - 'show'. If not - 'hide'. Its usage will be the as with:
<div data-bind="modal: detailedEmployee">
Data to show
</div>
The only thing you need to do is to use your favorite modals plugin. I prepared an example with the Twitter Bootstrap popup component: http://jsfiddle.net/euvNr/embedded/result/
In this example, custom binding is a bit more powerful; you could subscribe the onBeforeClose event and cancel this event if needed. Hope this helps.

The JSFiddle linked to in the answer provided by #Romanych didn't seem to work anymore.
So, I built my own example (based upon his original fiddle) with full CRUD support and basic validation using Bootstrap 3 and the Bootstrap Modal library: https://jsfiddle.net/BitWiseGuy/4u5egybp/
Custom Binding Handlers
ko.bindingHandlers['modal'] = {
init: function(element, valueAccessor, allBindingsAccessor) {
var allBindings = allBindingsAccessor();
var $element = $(element);
$element.addClass('hide modal');
if (allBindings.modalOptions && allBindings.modalOptions.beforeClose) {
$element.on('hide', function() {
var value = ko.utils.unwrapObservable(valueAccessor());
return allBindings.modalOptions.beforeClose(value);
});
}
},
update: function(element, valueAccessor) {
var value = ko.utils.unwrapObservable(valueAccessor());
if (value) {
$(element).removeClass('hide').modal('show');
} else {
$(element).modal('hide');
}
}
};
Example Usage
The View
<div data-bind="modal: UserBeingEdited" class="fade" role="dialog" tabindex="-1">
<form data-bind="submit: $root.SaveUser">
<div class="modal-header">
<a class="close" data-dismiss="modal">×</a>
<h3>User Details</h3>
</div>
<div class="modal-body">
<div class="form-group">
<label for="NameInput">Name</label>
<input type="text" class="form-control" id="NameInput" placeholder="User's name"
data-bind="value: UserBeingEdited() && UserBeingEdited().Name, valueUpdate: 'afterkeydown'">
</div>
<div class="form-group">
<label for="AgeInput">Age</label>
<input type="text" class="form-control" id="AgeInput" placeholder="User's age"
data-bind="value: UserBeingEdited() && UserBeingEdited().Age, valueUpdate: 'afterkeydown'">
</div>
<!-- ko if: ValidationErrors() && ValidationErrors().length > 0 -->
<div class="alert alert-danger" style="margin: 20px 0 0">
Please correct the following errors:
<ul data-bind="foreach: { data: ValidationErrors, as: 'errorMessage' }">
<li data-bind="text: errorMessage"></li>
</ul>
</div>
<!-- /ko -->
</div>
<div class="modal-footer">
<button type="button" data-dismiss="modal" class="btn btn-default">Cancel</button>
<button type="submit" class="btn btn-primary">Save Changes</button>
</div>
</form>
</div>
The ViewModel
/* ViewModel for the individual records in our collection. */
var User = function(name, age) {
var self = this;
self.Name = ko.observable(ko.utils.unwrapObservable(name));
self.Age = ko.observable(ko.utils.unwrapObservable(age));
}
/* The page's main ViewModel. */
var ViewModel = function() {
var self = this;
self.Users = ko.observableArray();
self.ValidationErrors = ko.observableArray([]);
// Logic to ensure that user being edited is in a valid state
self.ValidateUser = function(user) {
if (!user) {
return false;
}
var currentUser = ko.utils.unwrapObservable(user);
var currentName = ko.utils.unwrapObservable(currentUser.Name);
var currentAge = ko.utils.unwrapObservable(currentUser.Age);
self.ValidationErrors.removeAll(); // Clear out any previous errors
if (!currentName)
self.ValidationErrors.push("The user's name is required.");
if (!currentAge) {
self.ValidationErrors.push("Please enter the user's age.");
} else { // Just some arbitrary checks here...
if (Number(currentAge) == currentAge && currentAge % 1 === 0) { // is a whole number
if (currentAge < 2) {
self.ValidationErrors.push("The user's age must be 2 or greater.");
} else if (currentAge > 99) {
self.ValidationErrors.push("The user's age must be 99 or less.");
}
} else {
self.ValidationErrors.push("Please enter a valid whole number for the user's age.");
}
}
return self.ValidationErrors().length <= 0;
};
// The instance of the user currently being edited.
self.UserBeingEdited = ko.observable();
// Used to keep a reference back to the original user record being edited
self.OriginalUserInstance = ko.observable();
self.AddNewUser = function() {
// Load up a new user instance to be edited
self.UserBeingEdited(new User());
self.OriginalUserInstance(undefined);
};
self.EditUser = function(user) {
// Keep a copy of the original instance so we don't modify it's values in the editor
self.OriginalUserInstance(user);
// Copy the user data into a new instance for editing
self.UserBeingEdited(new User(user.Name, user.Age));
};
// Save the changes back to the original instance in the collection.
self.SaveUser = function() {
var updatedUser = ko.utils.unwrapObservable(self.UserBeingEdited);
if (!self.ValidateUser(updatedUser)) {
// Don't allow users to save users that aren't valid
return false;
}
var userName = ko.utils.unwrapObservable(updatedUser.Name);
var userAge = ko.utils.unwrapObservable(updatedUser.Age);
if (self.OriginalUserInstance() === undefined) {
// Adding a new user
self.Users.push(new User(userName, userAge));
} else {
// Updating an existing user
self.OriginalUserInstance().Name(userName);
self.OriginalUserInstance().Age(userAge);
}
// Clear out any reference to a user being edited
self.UserBeingEdited(undefined);
self.OriginalUserInstance(undefined);
}
// Remove the selected user from the collection
self.DeleteUser = function(user) {
if (!user) {
return falase;
}
var userName = ko.utils.unwrapObservable(ko.utils.unwrapObservable(user).Name);
// We could use another modal here to display a prettier dialog, but for the
// sake of simplicity, we're just using the browser's built-in functionality.
if (confirm('Are you sure that you want to delete ' + userName + '?')) {
// Find the index of the current user and remove them from the array
var index = self.Users.indexOf(user);
if (index > -1) {
self.Users.splice(index, 1);
}
}
};
}
Initializing Knockout with the View and the ViewModel
var viewModel = new ViewModel();
// Populate the ViewModel with some dummy data
for (var i = 1; i <= 10; i++) {
var letter = String.fromCharCode(i + 64);
var userName = 'User ' + letter;
var userAge = i * 2;
viewModel.Users.push(new User(userName, userAge));
}
// Let Knockout do its magic!
ko.applyBindings(viewModel);

I would create another observable that wraps the employee.
this.detailedEmployee = ko.observable({}),
var self = this;
this.showDetails = function(employee){
self.detailedEmployee(employee);
$("#dialog").dialog("show"); //or however your dialog works
}
Attach the click to showDetails. Then you can just call applyBindings on page load.