I have just started using the
<% Html.DevExpress().DateEdit()
control and i got it to work fine in my ASP.Net MVC application. The code is as shown below:
aspx page:
<% Html.DevExpress().DateEdit(settings =>
{
settings.Name = "EndDate";
settings.Properties.NullText = "dd/MM/yyyy";
settings.Properties.EditFormat = EditFormat.Custom;
settings.Properties.EditFormatString = "dd/MM/yyyy";
settings.Properties.DisplayFormatString = "dd/MM/yyyy";
settings.Date = Model.EndDate;
settings.Width = 100;
}
).Render();
%>
Above this code i have a reference to my javascript file (DateChanges.js) in this file i want to be able to do something like:
$(document).ready(function(){
$("#EndDate").change(function(){
//do whatever i want
});
})
I cant do this now cause using firefox i can see that the actual textbox that this datepicker assigns a value to has be named "EndDate_I". So my question is how can i easily do this since i want to be able to catch the change event of this control and play around with it in jQuery??
The DevExpress MVC Extensions offer their own infrastructure for the client-side processing needs (see the http://help.devexpress.com/#AspNet/CustomDocument6908 help topic to getting started).
It is necessary to handle the client-side ASPxClientDateEdit.DateChanged event, and retrieve the newly selected Date via the client-side ASPxClientDateEdit.GetDate() method. Use the retrieved js Date object for your additional needs:
<script type="text/javascript">
function OnDateChanged(s, e) {
var newDate = s.GetDate();
alert(newDate);
}
</script>
settings.Properties.ClientSideEvents.DateChanged = "OnDateChanged";
There is a rather long Blog post at http://kennytordeur.blogspot.com/2011/05/aspnet-mvc-where-is-clientid_10.html discussing your problem
( I think it is to long to have it pasted here, and the author deserves the credits )
following on from your comment on Mikhails's answer, there will be a property in the global namespace with the name of your control, so it's just like this:
CalculateDayDifference(s.GetDate(), EndDate.GetDate());
All the mvc controls do this, for some you might have to set the EnableClientSideApi property to start using them.
Related
I am 3 months into learning KnockoutJS and it has been great so far. However, I am facing an issue with binding.
This is the scenario:
I am using MVC with KO.
MVC model is passed down to the view, converted into a knockout object and pushed into the viewModel variable:
var data = ko.mapping.fromJS(#Html.Raw(Json.Encode(Model)));
var viewModel = new HP.ViewModels.CertificationPathViewModel(data);
ko.applyBindings(viewModel);
Within viewModel, I reference the MVC model as self.data:
ViewModels.CertificationPathViewModel = (function (data) {
var self = ViewModels.BaseEntityViewModel.apply(this, [data]);
// some other code
return { Data: self.Data, };
}
ViewModels.BaseEntityViewModel = (function (data) {
var self = this;
self.data = ko.observable(data);
// other code
return { Data: self.data, };
}
On the view, I data-bind like this:
<div id="drpControl" data-bind="CustomDropdown: Data().BusinessUnits.SelectedGroup, optionSettings: { CustomOptions: Data().Units.Groups, CustomOptionsCaption: '-- Select Group --' }"></div>
I try to update the self.data after an ajax call. I return the entire MVC model object and attempt to replace self.data like this :
self.data(updatedModel)
My expectation is that KO will take care of the update and no extra binding is needed. It works great for simple binding (ex. Value: Data().Something) but it doesn't work for complex binding (ex. value: Data().BusinessUnits.SelectedGroup ).
The controls that have complex binding are still bound to the old model, so KO doesn't know what to pass back next time I submit an ajax request.
Is this a limitation of KO, or I am not doing something properly?
Thanks
the ko.mapping plugin changes every property on self.data into an observable. During your update, you need to remap the updated data.
Since you didn't actually post your code, just unformatted snippets I can't help a whole bunch, but you should start by changing this line: self.data(updatedModel) to this:
ko.mapping.fromJS(updatedModel, self.data);
see the Knockout.JS mapping documentation
Protip for stack overflow - include your full code, to the extent that it's possible. Also, if you can, make a jsfiddle that reproduces your problem.
I have a KendoUI Grid I'm using an MVC web application, all working fine however I want to add a custom command button that is shown conditionally in the UI and simply executes a command on my controller passing it the required parameter.
columns.Command(command => command.Custom("UnlockAccount").SendDataKeys(true).Click())
The command is specified as above but I only want the button to show when the DataItems IsLocked property is true.
I also cannot figure out how to just call and method on the controller rather. I cannot find a demo of this on the Kendo site and not sure how to move this forward.
Here is a specific example for using client templates for conditional command buttons.
const string ShowUpdateButton = "#if (IsNetReversal == false) {#<a class='k-button k-button-icontext k-grid-edit' href='\\#'><span class='k-icon k-edit'></span>Update</a>#}#";
const string ShowReverseButton = "#if (IsNetReversal == false) {#<a class='k-button k-button-icontext k-grid-reverse' href='/JournalDetail/Reverse/#: ID #' ><span class='k-icon k-reverse'></span>Reverse</a>#}#";
const string ShowDeleteButton = "#if (IsAdjustment == true) {#<a class='k-button k-button-icontext k-grid-delete' href='\\#'><span class='k-icon k-delete'></span>Delete</a>#}#";
You can do the template inline but I find it easier (particularly for multiple buttons) if you declare constants and then use string.format to concatenate them.
col.Template(o => o).ClientTemplate(string.Format("{0}{1}{2}", ShowUpdateButton, ShowDeleteButton, ShowReverseButton));
The upside is it will work with popup editor whereas jquery hacks will ignore the conditional status when a user cancels out of edit. A cancel from the popup editor will restore the grid row from the viewmodel or wherever Kendo stores it which results in button states from before any jquery/javascript hack. The method above will also auto-wire the standard commands since I copied their HTML output for the client template.
The downside is that if Kendo changes their pattern for command buttons the client template may fail. I tired several other methods besides this one and the downside to this method seems better than the other methods.
Note on Kendo Forums: As of the date of this post, they do not appear to allow people who do not pay for support to post to the forums so I would suggest posting questions here instead. They monitor Stack Overflow and in my experience they seem to answer questions more quickly here.
Use template column instead - via the ClientTemplate method.
Conditional templates are covered here and multiple times on the forums - the Command columns is not that flexible.
As of the December 2018 release of Kendo, you can now conditionally display custom buttons more easily, but it still relies on JavaScript to do its work, this function should be defined before your dataGrid or you'll run into issues.
function showCommand(dataItem) {
console.log("determining to hide or show" + dataItem);
// show the Edit button for the item with Status='New'
if (dataItem.Status == 'New') {
return true;
}
else {
return false;
}
}
Then the code for the Grid.
.Columns (columns => {
columns.Command (
command => command.Custom ("Approve")
.Visible ("showCommand")
.Click ("approveFunc")
)
.Width (100)
.HeaderTemplate ("Actions")
})
You can control custom command button visibility by Visible property.
columns.Command(command => command.Custom("UnlockAccount").SendDataKeys(true).Click().Visible("unlockAccountVisible"))
Visible property accepts JS function name and passes current dataItem as an argument.
JS function that evaluates button visibility:
<script>
function unlockAccountVisible(dataItem) {
// show the UnlockAccount button only when data item property IsLocked == true
return dataItem.IsLocked;
}
</script>
Read more in Show Command Buttons Conditionally kendo-ui documentation article.
I am loading two MVC Partial Views in jQuery UI dialog using following code for editing and adding a record:
$.get(url, function(data)
{
dialogDiv.html(data);
var $form = $(formid);
$form.unbind();
$form.data("validator", null);
$.validator.unobtrusive.parse(document);
var dat = $form.data("unobtrusiveValidation");
var opts = dat ? dat.options || '' : '';
$form.validate(opts);
//THIS FUNCTION ADDS PLUGINS ETC.
runEditCreateStartScripts();
dialogDiv.dialog('open');
});
Following is the function that wires-up chosen functionality.
function runEditCreateStartScripts(){
$("select.chzn-select").chosen(
{
no_results_text: "no match",
allow_single_deselect: true
});
}
Everything is perfect on first call. After opening one dialog say edit a few times everything is broken. There is only hyperlink available in place of chosen stuff. This also happens if I open one dialog say add and then second dialog. The bindings and other functionality from first one (add) is gone.
Any insights on why this might be happening?
The problem that caused my issue was that the modals I was loading via AJAX had inputs with the SAME ID as an input field that was already on the page (using Django that has generic ID generators for model fields). This caused collision between the two inputs when re-triggering .chosen() on the selector. When I made the ID fields unique, all worked as expected.
Hope this would have helped.
I'm using Handlebars.js, and currently all my templates live inside script tags which live inside .html files housing dozens of other templates, also inside script tags.
<script type="text/template" id="template-1">
<div>{{variable}}</div>
</script>
<script type="text/template" id="template-2">
<div>{{variable}}</div>
</script>
<script type="text/template" id="template-3">
<div>{{variable}}</div>
</script>
...
Then I include this file on the server-side as a partial.
This has the following disadvantages:
A bunch of templates are crammed into HTML files.
Finding a given template is tedious.
I'm looking for a better way to organize my templates. I'd like each each template to live in its own file. For example:
/public/views/my_controller/my_action/some_template.html
/public/views/my_controller/my_action/some_other_template.html
/public/views/my_controller/my_other_action/another_template.html
/public/views/my_controller/my_other_action/yet_another_template.html
/public/views/shared/my_shared_template.html
Then at the top of my view, in the backend code, I can include these templates when the page loads, like this:
SomeTemplateLibrary.require(
"/public/views/my_controller/my_action/*",
"/public/views/shared/my_shared_template.html"
)
This would include all templates in /public/views/my_controller/my_action/ and also include /public/views/shared/my_shared_template.html.
My question: Are there any libraries out there that provide this or similar functionality? Or, does anyone have any alternative organizational suggestions?
RequireJS is really good library for AMD style dependency management. You can actually use the 'text' plugin of requireJS to load the template file in to your UI component. Once the template is attached to the DOM, you may use any MVVM, MVC library for bindings OR just use jQuery events for your logic.
I'm the author of BoilerplateJS. BoilerplateJS reference architecture uses requireJS for dependency management. It also provides a reference implementations to show how a self contained UI Components should be created. Self contained in the sense to handle its own view template, code behind, css, localization files, etc.
There is some more information available on the boilerplateJS homepage, under "UI components".
http://boilerplatejs.org/
I ended up using RequireJS, which pretty much let me do this. See http://aaronhardy.com/javascript/javascript-architecture-requirejs-dependency-management/.
I use a template loader that loads the template using ajax the first time it is needed, and caches it locally for future requests. I also use a debug variable to make sure the template is not cached when I am in development:
var template_loader = {
templates_cache : {},
load_template : function load_template (params, callback) {
var template;
if (this.templates_cache[params.url]){
callback(this.templates_cache[params.url]);
}
else{
if (debug){
params.url = params.url + '?t=' + new Date().getTime(), //add timestamp for dev (avoid caching)
console.log('avoid caching url in template loader...');
}
$.ajax({
url: params.url,
success: function(data) {
template = Handlebars.compile(data);
if (params.cache){
this.templates_cache[params.url] = template;
}
callback(template);
}
});
}
}
};
The template is loaded like this:
template_loader.load_template({url: '/templates/mytemplate.handlebars'}, function (template){
var template_data = {}; //get your data
$('#holder').html(template(template_data)); //render
})
there's this handy little jquery plugin I wrote for exactly this purpose.
https://github.com/cultofmetatron/handlebar-helper
I have a multi-page document and I'm binding to the pageshow event of page "myId":
$('#myId').live('pageshow', renderMyIdTempalates);
I'm applying my JSON templates with PURE like this
function renderMyIdTempalates(event) {
$.mobile.showPageLoadingMsg();
var $page = $("#myId");
// do ajax call
$page.children( ":jqmData(role=header)" ).directives(...).render(data);
$page.children( ":jqmData(role=content)" ).directives(...).render(data);
$.mobile.hidePageLoadingMsg();
}
Initially I was using
$('#myId').directives(...).render(data);
to apply my templates. This caused problems since the selector didn't include the jqm attributes. So I used the jqmData method to grab the header and content to apply my templates. This works fine, but how do I select the entire document that I'm working with? I would prefer to apply my templates to the entire document once.
I tried:
$(":jqmData(role=page)") // selects all pages
$(":jqmData(id=myId)") // no luck
Any ideas?
the selector
div:jqmData(id="myID")
should work. just remember that myID should not be the id of that div.That page div should have a parameter data-id="myID"