I'm migrating an app from rails to volt which uses some jquery plugins.
As example, one of them is http://ionden.com/a/plugins/ion.rangeSlider/en.html
I'm using opal-jquery inside action_ready to call the plugin, and visually it works. However internally it hides the original input and uses .val() to set the value for that input once the slider gets moved by the user. The problem is that even that the input is declared with a reactive field as its value, once jquery changes its value, the variable stays the same instead of syncing with the input value
this problem could be reproduced by creating a input like
<input type="text" value={{_value}} id="example"/> <p>{{_value}}</p>
and in the console do something like
$('#example').val('only the visual will change')
the same thing would apply for other plugins like jquery.ui sortable in which the callback would populate a field from the model with a index value.
is there a way to make legacy plugins that change values work with voltrb?
Related
I have a selectmenu like the following
<select name="scale" id="scale">
<option selected>linear</option>
<option>root</option>
<option>square</option>
</select>
To make it nice I use jQuery UI v1.11.2.
$('#scale').selectmenu();
I can now read the value of the dropdown by
alert($('#scale').val());
which results in 'linear' as the answer. I can also set the value to 'square' by using
$('#scale').val('square');
alert($('#scale').val());
which correctly gives the answer 'square'. But (!!!) the dropdown does not display this on the screen. So actually I can set and read the value, but the visual representation doesn't change - the widget does not refresh. I read somewhere to throw a .change() but without any effect. I also tried answers like in jQuery UI Selectmenu value set dynamically does not change visible selected value but failed. Any $('#scale').selectmenu('value', 'square'); resuts in the error message Error: no such method 'value' for selectmenu widget instance.
Can anyone help how to refresh the widget after setting it to a new value?
It should work as you expect it to if you just call refresh after using .val():
$('#scale').val('square');
$("#scale").selectmenu("refresh");
The reason for this is that the .val() function is provided by jQuery, while the widget is part of jQueryUI. [presumably the $.ui authors didn't want to alter the $ functionality, though this is purely speculation on my part]
So, I'm trying to select a polymer custom element(using paper_elements) in my view with querySelector. I'm able to select regular html elements just fine. In particular, I'm trying to select a specific paper-input element. I want to be able to query it's input element which is buried in it's second shadowroot.
I've tried the following:
querySelector('#my-paper-input::shadow #input')
querySelector('paper-input::shadow input')
and a bunch of other variations. However, no matter what I do, the query always returns null. It's driving me mad because I can style it in css. What do?
As far as I know you have to use several steps
querySelector('#my-paper-input').shadowRoot.querySelector('input');
but you should also be able to access the value using the attribute of the outer element like
querySelector('#my-paper-input').attributes['value'] or
querySelector('#my-paper-input').attributes['inputValue']
you could also use http://pub.dartlang.org/packages/angular_node_bind
but I wasn't able using Angular with paper-elements recently (see https://github.com/angular/angular.dart/issues/1227)
Select boxes converted to Select2, do not automatically integrate with unobtrusive validation mechanism in ASP.NET MVC framework.
For example, on a form which contains a regular select box (marked as required in model definition), submitting the form while no options have been selected in the select box, will cause the border and background of the select box to take a reddish color, and by using #Html.ValidationMessageFor, error messages, if any, can be displayed beside the box. However if the select box is converted to a Select2 component, then none of the mentioned features work any more. Even the validation error message will not show up.
It seems that the reason for even the validation error message not showing, is because Select2 changes the display CSS property of the original select box to none (display:none), and I guess the unobtrusive validation script does not bother generating error messages for invisible fields.
Any ideas / solutions?
This issue isn't really specific to Select2, but rather to the jQuery unobtrusive validator.
You can turn on validation for hidden fields as highlighted in this answer.
$.validator.setDefaults({
ignore: ''
});
As the comments noted, it didn't work inside an anonymous callback function within $(document).ready(). I had to put it at the top level.
I've run into similar issues with the select2 plugin. I don't know exactly which features you're using specifically, but in my experience, when you set an element as a select2 in the document.ready event, the plugin will change some of the element's attributes on the fly (inspect one of the elements after your page has finished loading - oftentimes you'll see the id and class properties are different than what you're seeing when you view source).
It's difficult to offer more without actually seeing the code, but here's a few ideas to get you started:
First off, obviously make sure you have the a link to your select2.css stylesheet in the header.
Then, since you're talking about form submissions, I'd recommend you examine whether or not you're getting a full postback or submitting via AJAX (if you're using jQueryMobile, you're using AJAX unless you override it in the jquerymobile.js file or set a data-ajax="false" in your form attributes). You can just look at the value returned by Request.IsAjaxRequest() for this. Obviously if you're submitting via ajax, you won't hit the document.ready event and the select2 won't initialize properly and you'd need to figure out a way around that. Try refreshing the page after the submit and see if it renders the select2 component.
Then I'd suggest examining the elements and see if they're not behaving like you'd expect because you're actually trying to work with classes that the plugin has reassigned at runtime. You can either just adjust your logic, or you can dig into the select2 code itself and change the behavior - it's actually fairly well-documented what the code is doing, and if you hop on the Google group for select2, Igor is usually pretty quick to follow up with questions.
like this
$('select').on('select2:select', function (evt){
$(this).blur();
});
$('body').on('change', 'select.m-select2', function () {
$(this).blur();
})
I have a complex ICEFaces XHTML page that renders certain components conditionally, based on flags set as the user enters data on the page. What I'd like to do is direct focus to a certain field as soon as it appears, which may not be during the initial render of the page.
The ICEFaces documentation suggests that I can do this using the focus attribute of the outputBody component. Specifically:
If you setting the initial focus, the focused component must be rendered on first render call, if not then set the focus attribute only when the component gets rendered.
This seems to suggest that I can manipulate the value of the focus attribute at the time that my conditional component gets rendered. However, I don't see any attributes of the inputText component that allow me to change a value at the time the component is rendered.
Am I misreading the documentation? When and where can I alter the value of the focus attribute of outputBody so that my conditionally-rendered field gets the input focus when it appears? Or am I using the wrong tool to solve this problem?
Maybe you can use this
JavascriptContext.applicationFocus(FacesContext.getCurrentInstance(), "form:fieldM");
You can use some Javascript to set focus on an element.
Here's the Java snippet required to do this:
JavascriptContext.addJavascriptCall(FacesContext.getCurrentInstance(),
"document.getElementById('myForm:myTxtBox').focus();");
myTxtBox is the ID of your form element, and myForm is the ID of your form.
You can use this wherever you are changing certain variables' values to render/hide fields.
Due to the fact that I'm using both Seam and ICEFaces, I was not able to invoke Javascript reliably from my server-side Java code. I was, however, able to add the necessary Javascript in-line in my XHTML, within the ui:component that was being conditionally rendered, close to the input field I needed the focus to go to. The relevant section of my XHTML looks like this:
<ice:panelGroup id="textPanelInput" >
<ice:form id="textInputForm" partialSubmit="true" style="vertical-align:middle;">
<ice:inputText id="textInput" valueChangeListener="#{appField.valueChangeListener}"
size="#{appField.fieldDefLengthAsInt}"
value="#{appField.value}"
styleClass="fieldStyle" rendered="#{appField!=null}"
>
</ice:inputText>
<ice:message id="jo" for="textInput" />
</ice:form>
</ice:panelGroup>
<script type="text/javascript">document.getElementById('panelsFields:0:textInputForm:textInput').focus();</script>
The Javascript line at the bottom is the line I added to solve my problem. All of the code above is in a ui:component block that may or may not be rendered, based on other conditions. When this ui:component block is rendered, my Javascript goes with it, and sets the input focus to my desired input field.
ICEfaces supports javascript api which has setting focus function. Thus you may use it like in the next excerpt:
<script type="text/javascript">
jQuery(document).ready(function () {
ice.applyFocus(elementId);
});
</script>
elementId is jsf component clientId.
ICEFaces javascript Api
I am having a html dropdown
<select id="ExternalIp" onchange="externalIpchange()"></select>
I bind the data to dropdown through jquery and a I am passing data from controller which is working properly. I want to change the look and feel of the dropdown so I called a function
$("#ExternalIp").selectbox();
Now the look and feel of drop down is changed but it is not showing the data which I bind to dropdown. I am not getting what is the problem. Plz help
It appears as if the jQuery plugin you are using resets the values bound to the select list.
Look for a method provided within your jQuery plugin to rebind the data which you earlier attached with jQuery or style your element first and then try binding the values.
Cheers!!!