I am working with MVC 3 at the moment where I use the ViewBag. I would like to test if one of the properties of the ViewBag has been assigned. I know in PHP you could do isset(variable), but is there something similar in .NET 4?
The scenario is that I am making a nested layout which takes a section title and a section subtitle through the ViewBag. They are seperated by a seperator and the sub title is optional. I don't want to display the seperator if the sub title is not set.
This is how I imagine it where isset would be replaced by the .NET 4 equivelant.
#section header
{
<h2>#ViewBag.SectionTitle</h2>
#if(isset(ViewBag.SectionSubTitle))
{
<div id="section-title-seperator"> - </div><h3>#ViewBag.SectionSubTitle</h3>
}
}
Next to the direct answer to my question, I'm also open to alternate solutions (in case I'm abusing the ViewBag).
Thanks in advance.
You can check if it is null like this:
#if(ViewBag.SectionSubTitle != null).
isset() in PHP actually just checks if there is a value present. From the manual:
isset() will return FALSE if testing
a variable that has been set to NULL
You can also use ViewDataDictionary.ContainsKey on your ViewData property. Because ViewData["SectionSubTitle"] is equavilient to ViewBag.SectionSubTitle so in this case you could do:
#if(ViewData.ContainsKey("SectionSubTitle"))
Related
I made a template and there is a <select dojotype="dijit.form.ComboBox" dojoAttachPoint="selectPageNumber" id="selectPageNumber">tag with id and dojoAttachPoint be "selectPageNumber". I want to populate it with options upon create so I add some code to the postCreate function:
var select = dijit.byId("selectPageNumber");
or
var select = this.selectPageNumber;
but I always have select being undefined.
What am I doing wrong?
UPD:
The problem with element has been solved spontaneously and I didn't got the solution. I used neither dojo.addOnLoad nor widgetsInTemplate : true, it just started to work. But I have found the same problem again: when I added another tag I can't get it!
HTML:
<select class="ctrl2" dojotype="dijit.form.ComboBox" dojoAttachPoint="selectPageNumber" id="selectPageNumber">
</select>
<select class="ctrl2" dojotype="dijit.form.ComboBox" dojoAttachPoint="selectPageNumber2" id="selectPageNumber2">
</select>
widget:
alert(this.selectPageNumber);
alert(this.selectPageNumber2);
first alert shows that this.selectPageNumber is a valid object and the this.selectPageNumber2 is null.
widgetsInTemplate is set to false.
all the code is within dojo.addOnLoad()
dojo.require() is valid
I am using IBM Rational Application Developer (if it is essential).
WHY it is so different?
Based on your syntax, I am assuming that you are using 1.6. Your question mentions template and postCreate, so i am assuming that you have created a widget that acts as a composite (widgets in the template).
Assuming 1.6, in your widget, have you set the widgetsInTemplate property to true. This will tell the parser that your template has widgets that need to be parsed when creating the widget.
http://dojotoolkit.org/documentation/tutorials/1.6/templated/
I would remove the id from the select. Having the id means that you can only instantiate your widget once per page. You should use this.selectPageNumber within your widget to access the select widget.
If you are using 1.7 or greater, instead of setting the widgets widgetsInTemplate property, you should use the dijit._WidgetsInTemplateMixin mixin.
http://dojotoolkit.org/reference-guide/1.8/dijit/_WidgetsInTemplateMixin.html
Depending on when dijit.byId() is being called, the widget may not have been created yet. Try using dojo.addOnLoad()
dojo.addOnLoad(function() {
var select = dijit.byId("selectPageNumber");
});
I came close to the solution: it seems like there is a some sort of RAD "caching" that doesn't respond to changes made in html code.
Ways to purge the workspace environment with RAD (based on Eclipse) might be a solution.
I got my autocomplete stuff working well enough to see that it's returning some data when I type in a field--but the data shown in the dropdown below the textbox is just a vertical column of asterisks or list item bullets. (I can't really tell what they are.)
When I query the web service directly in the browser, it returns a Json array as expected which looks like this where, for example ?term=chi (I've added some line breaks for readability)
[
{"Name":"Chihuahua"},
{"Name":"Chinese Crested"},
{"Name":"Chinese Shar-Pei"},
{"Name":"Japanese Chin"},
{"Name":"Schipperke"}
]
My JavaScript looks like this:
$(function() {
$("#Breed").autocomplete({
source: "#Url.Action("BreedList", "Patient")"
});
});
like I say, my textbox in question (#Breed) does respond sort of like an autocomplete box, but the dropdown data is weird. Any ideas?
Although I did have a CSS bundling problem (somehow I had omitted the jquery ui css from my bundle), a bigger issue was that the Json returned by my service needed a lower case "value" property for each item. I was using the column name as cased on my Linq query. The tip that pointed me in the right direction on this came from the answer here: jQueryUI autoComplete returns back empty list
How to disable the inArray validator of Zend\Element\Select ?
I can not remove this standard validator select element.
Edit:
What I'm trying to do is populate a select element so dynamic with ajax. So that way the inArray loses the reference field value.
Does anyone know what is the right way to populate this element with ajax?
It actually does not look like it is possible at this point in time to disable the validator; however, you can override the select element to be able to remove the validator for this specific case:
use Zend\Form\Element\Select;
class MySelect extends Select {
public function getValidator() {
return $this->validator;
}
}
Basically the key issue with the current select element is that if the validator does not exist; it will create it. The other option you have here is to set a validator manually; which you should likely be doing is manually creating an InArrayValidator and populating it with the potential options that would be coming from your AJAX call. In which case you would need to add a setter above.
Since version 2.2, Zend Framework provide the ability to disable inArray validator calling:
$element->setDisableInArrayValidator(false);
or passing option to an element:
'disable_inarray_validator' => false
I have a Dojo UI widget that has a widget embedded within it. I need to pass an object to this embedded widget for it to set itself up correctly, but I'm not sure how to do it.
I have been templating in the embedded widget in the template for the wrapper widget, for example:
...<div class="thing"
data-dojo-type="mycompany.widgets.ComplexEmbeddedWidget"
data-dojo-props="stuff: '${stuff}'"></div>...
but this doesn't seem to work, I guess the data is passed as a string maybe?
I'm pulling out this data by setting it to a property in the embedded widget and then referencing it in my postMixInProperties function.
Doubtless this is the wrong approach, what should I be doing to set up an embedded widget such as this?
I think if you are going to use this approach, you want to convert the javascript object json before it is passed to the templated embedded widget.
You can easily do this by requiring 'dojo/json' and doing
this.stuff=jsonModule.stringify(this.stuffAsObject);
As you have already discovered, if you are setting more complex properties, programmatic instantiation is probably the way to go.
If your mycompany.widgets.ComplexEmbeddedWidget is desperate to have the object 'stuff' set allready once it is initialized (in constructor), then im not sure this approach will do, however a simple fix could be removing the ' quotes around ${stuff}?
What happens is basically that you derive the widget with dijit/_TemplatedMixin. This in turn, during buildRendering, calls _stringRepl on 'this' (the widget). I am not completely certain of the flow, since youre working with WidgetsInTemplate..
lets as example, set a widgets attribute to an array via markup:
<div
data-dojo-type="dijit.form.Select"
data-dojo-props="options:[ 'val1', 'val2']">
</div>
As you see, no quotes around the value - or it will render as a string. Lets then change your ComplexEmbedded template to
dojo.declare("exampleName", [_WidgetsInTemplateMixin, _TemplatedMixin], {
templateString: '<div class="outerWidgetDomNode">
...
<div class="thing"
data-dojo-type="mycompany.widgets.ComplexEmbeddedWidget"
data-dojo-props="stuff: ${stuff}"></div>
...
'
});
To instantiate the ComplexEmbeddedWidget.stuff with an object, this needs to be a string. _Templated uses dojo.string.substitute, which probably would fail if given deep nested object.
Markup example:
<div data-dojo-type="exampleName" data-dojo-props="stuff: '{ json:\'Representation\', as:\'String\'}'"></div>
Or via programmatic
var myObj = { obj:'Representation', as:'Object' };
var anExampleName = new exampleName({
stuff: dojo.toJson(myObj) // stringify here
}, 'exampleNode');
Lets know how goes, ive been wanting to look into the presendence of flow with this embedding widgets into template stuff for a while :)
You can programmatically insert widgets. This seems to be be the way to go if the inserted widget requires JavaScript objects to be passed to it.
I'm just getting started with dojo, and I've understood that dojo.query is the same as $ in jQuery.
But I haven't figured out what it returns. Is it a specialized object like in jQuery?
What I'm trying to do (with no luck) is:
dojo.query("output").innerHTML = data;
//this doesn't work either:
dojo.query("output").html(data);
//tried accessing by id as well
dojo.query("#output").html(data);
//and tried to access a div, incase dojo has some issues with html5 elements
dojo.query("#divOutput").html(data);
And I'm currently using the new html5 elements:
<output id="output">Output goes here</output>
<div id="divOutput">non-html5 output goes here</div>
And I can't seem to find a good list on what to do with objects returned by dojo.query()..
edit: Okay, I think dojo is just messing with me now. I found this method: addContent() and that works on the above selector. But I don't want to add content, I want to replace content...
The query method returns a NodeList object.
In the ref for NodeList you can find a list of functions that you can apply to the list
of elements. There is no innerHTML function for the list, but the html function should work.
There is no "output" element in HTML, perhaps you try to target elements with the class name "output"?
dojo.query(".output").html(data)
Or the element with id "output"?
dojo.query("#output").html(data)
If you want to replace all the output tags' content with the same thing, then this code should always work:
// replace the contents of ALL <output> tags
dojo.query('output').forEach(function(node) { node.innerHTML = data; });
Dojo also provides a little shortcut for these kinds of things. You can specify a string to NodeList's forEach function like this:
// replace the contents of ALL <output> tags (as long as data is global)
dojo.query('output').forEach("item.innerHTML = data;");
The word item in the string is special. (This is a pain to debug, so it might not be worth it.)
As was said above, query method returns NodeList object, so you can iterate it's result as array, or use dojo methods that work with NodeList (e.g. attr):
dojo.query("#divOutput").attr("innerHTML", data);
But as soon as you are trying to query nodes by id, it would be better to use dojo.byId() method, which returns domNode:
dojo.byId("divOutput").innerHTML = data;
Or in more dojo style:
dojo.attr(dojo.byId("divOutput"), "innerHTML", data)
Try this by adding the [0] like this:
dojo.query("output")[0].innerHTML = data;
Also, there is a dojox.jq wrapper (in development, coming in 1.4) which emulates the JQuery return object APIs
The documentation seems to be a mess, this is the only thing i get to work with 1.7,
dojo.query("whatever").forEach(function(node, index, array)
{
node...
});