I'm having trouble displaying the first option in a select element like this: http://jsfiddle.net/L6h9Q/
I want the first option tag to work as a placeholder but the second one is displayed first by default.
you can add selected="selected" attribute to the first option to put it on default.
Disabled items (by definition) cannot be selected. The item that is shown when the page is loaded is indeed selected.
The canonical way around this using plain JS and HTML is to leave that option enabled, then validate your form result upon submission (client- and server-side). If the user has selected the placeholder option ("City..." in your case), then let them know that they have made an invalid selection.
A workaround: http://jsfiddle.net/L6h9Q/2/
Essential part:
Add required to select;
Use select:invalid to make the color gray;
use option:first-child to make the first option gray.
Downside: works only on HTML5/CSS3 supported browsers.
Edit:
Inspired by #Russell, here's a (somewhat) better solution: http://jsfiddle.net/L6h9Q/3/
yes because It will show only enabled values first and then disabled values
Related
I have a Employee entity that I'm binding to an "Edit" view in an MVC3/Razor application. The Employee entity has a property for OccupationTypeId. OccupationTypeId points to the OccupationType table which contains several lookup values. The natural choice would be to use #Html.DropDownListFor to render a <select> tag containing a list of Occupations.
The OccupationType table schema is fairly standard: Id, Name, Description, IsEnabled. Since OccupationTypes can be disabled, I want the OccupationTypeId drop down to still render disabled options so the user can always see their selection if it's disabled, but a disabled option can't be selected by the user. In other words, a user can't change an existing OccupationTypeId to a disabled option.
I thought about creating a #Html extension method to build my <select> tag with the options and simply tack on a disabled attribute to disabled options. I think that would be straight forward...
However, disabled selected options don't seem to post back to the controller method. In other words, Employee.OccupationTypeId would be null when I post to Edit.
Is there any way to change this behavior or is this built in to MVC 3? I thought about using hidden fields, but what if OccupationTypeId is required and I have validation enabled?
Has anyone else faced this?
Thanks
You could have a hidden field that gets updated when the change event occurs in the dropdown list. This way the OccupationTypeId field is always passed.
<input name='CurrentOccupationId' type='hidden' value='#Model.Employee.OccupationTypeId' />
<script>
$(function() {
$('#dropDownId').change(function() {
$('input[name="CurrentOccupationTypeId"]').val($(this).val());
});
});
</script>
Is there any way to change this behavior or is this built in to MVC 3?
I thought about using hidden fields, but what if OccupationTypeId is
required and I have validation enabled?
It has nothing to do with MVC 3 in particular; all disabled html elements don't post back in general.
The solution I've used is to "simulate" the disable element by styling the appropriate element with CSS. You can, for example, set the element's background (or foreground) color to gray and set the readonly attribute (when it makes sense) instead.
See this similar thread.
What is it called or where can I find code for placing a 'suggestion' or grayed out text in a form field box that doesn't get pass as a value. I know i can prepopulate it, but want to use it to only provide guidance. Example, box that says " "
The terminology you're referring to is called a watermark.
There are many existing Javascript solutions written for this already, like this one.
JavaScript will do this. I've used the jQuery framework, for example:
Setting the value:
$('#comment_box').val('Optional comment..');
On click, removing the value:
$('#comment_box').val('');
On submit:
if (comment == 'Optional comment..'){
comment = '';
}
And submit your comment. I've left out the functions here but you can get an idea.
HTML5 has a placeholder attribute supported by many modern browsers.
(But alas not MSIE.)
The above-linked article explains how to test for support and implement a javascript fallback.
use
<input type=text disabled value='...'/>
(disabled wont pass the values, whereas readonly will pass the value)
I think what you are referring to is a watermark
http://www.asp.net/ajax/ajaxcontroltoolkit/Samples/TextBoxWatermark/TextBoxWatermark.aspx
or
there are jquery defaultvalue plugins
Hello (this is a copy of my post on the Seaside mailing list; first try at stackoverflow),
How do I get the rendered display of a drop-down select list to show an updated selection from another session, in Firefox? (I'm using 3.6.13)
This problem does not appear in Chrome, IE or Opera.
Here is the scenario: I have a domain object with an attribute displayed in a drop-down list. Some other session updates the attribute. I refresh my display, but the rendered selection does not change. Using Firebug, the generated html shows the updated selection. This may be basic HTML knowledge, but should the displayed value not update to show the changed 'selected' option? Or is the value intended to be set only on the initial page display and then only by a user action?
Example: I have a demo Seaside component with a class variable #testStateListSelection which is selected to 'one' in a Seaside session. If I change the value to 'three' in another Seaside session, the displayed value stays as 'one' in the original session after rendering again, even though the "selected" in the generated HTML shows "three".
renderSelectionListOn: html
html form: [
html select
list: #('one' 'two' 'three' 'four' 'five');
selected: self class testStateListSelection;
callback: [:value | self class testStateListSelection: value].
html break.
html submitButton
callback: [Transcript cr; show: self class testStateListSelection];
with: 'Save']
...the displayed value shows 'one', even though the HTML is...
<select name="1">
<option value="1">one</option>
<option value="2">two</option>
<option value="3" selected="selected">three</option>
<option value="4">four</option>
<option value="5">five</option>
</select>
How do I get the drop-down selected value to show 'three'?
BTW: all I know about HTML & browser behaviour I've learned from coding Seaside, so I may have a skewed perspective ;-)
Thanks for any help.
The problem is that, when you refresh your page, your browser is remembering which option was previously selected. This feature is designed to make it harder to lose your form data during long forms and is discussed a bit on the Mozillazine forums
Instead of refreshing the page. if you load the page "fresh" by going to the address bar and pressing return, you'll get the page loaded from the server again - with the updated select
Another cause of the problem might be that your browser tries to autocomplete the form for you based on your last submission. Make sure you have disabled this feature in the preferences of your web browser. You can also try to tell the form-tag with an unofficial attribute not to autocomplete:
html form noAutocomplete; with: [ ...
Whenever the page is refreshed the accessor self class testStateListSelection is run.
In fact the code you provide works perfectly for me. Are you sure that the accessors work as expected?
testStateListSelection
^ testStateListSelection " <-- forgetting the return is a common problem "
testStateListSelection: aString
testStateListSelection := aString
If using javascript to refresh the page...
window.location.reload();
...will NOT re-render the select elements. They will retain their dynamic values regardless of what the new source HTML says.
To force the select elements to re-render, use...
window.location.reload(true);
I have a select box (for a customer field) on a complex order form, when the user starts to add lines to the order they should not be allowed to change the customer select box (unless all lines are deleted).
My immediate thought was that I could use the disabled attribute, but when the box is disabled the selected value is no longer passed to the target.
When the problem arose a while ago one of the other developers worked around this by looping through all the options and disabling all but the selected option, and sure enough the value was passed to the target and we've been using since. But now I'm looking for a proper solution, I don't want to loop through all the options because are data is expanding and it's starting to introduce performance issues.
I'd prefer not to enable this / all the elements when the submit button is hit.
How can I lock the input, whilst maintaining the selected option and passing that value to the target script? I would prefer a non-JavaScript solution if possible, but if needed we are running jQuery 1.4.2 so that could be used.
Edit
I've tried to use the readonly attribute with little success, here's the jQuery code I'm using:
$('.abc').each(function(element) {
$(this).attr('readonly','readonly');
});
When inspecting the element with Firebug the readonly attribute had been set, but I can still change the value in the select box?!
This works:
$('.abc :not(:selected)').attr('disabled','disabled');
jQuery will still be looping through the elements behind the scenes, but I seriously doubt you will have performance issues unless your select has thousands of elements (in which case your usability issues will far out weigh the performance issues). The original code must have been doing something wrong.
This works fine
<select disabled="true">
<option value="1">one</option>
<option value="2">two</option>
<option value="3">thre</option>
</select>
Add a hidden field to your form and onsubmit take the value from the select and place it in the hidden field's value
As per the HTML spec, readonly is not supported by the select tag
The element does not accept readonly attribute. Readonly is a wrapper that fix this.
Try this:
https://github.com/haggen/readonly
"select" does not have a readonly attribute. It has only disabled attribute.
http://www.w3schools.com/TAGS/att_select_disabled.asp
So your best best is:
$('.abc').each(function(element) {
$(this).attr('disabled','disabled');
});
HTH
I'd have an idea, that was functional to me:
In my case, when a user selects an option (an account) in a drop-down on a form of an accounting system, e.g., some kind of "expense", that I know that may not be "credited", just "debited", another drop-down that selects the accounting operation (Debit/Credit), changes these drop-down to "Debit".
Then, I "lock" (using "disabled=true") these last "drop-down" in the "debit" option.
The problem that occurred to me these moment, was similar of yours: after disabling the drop-down element, I couldn't receive it in the target, anymore.
So, what I've done:
1 - Changed the option in the second drop-down list, as I said:
document.getElementById("operation").value = "D";
`
2 - Disabled that dropdown:
document.getElementById("operation").disabled = true;
Then, the "cat salt":
3a- Added to the "FORM" element, an "onsubmit"
onsubmit = "validForm()"
3b - On my [java-script] file I added the ["valid-Form"] function:
function validForm()
{
document.getElementById("operation").disabled = false;
}
Voilá!
A simple way to disable any Select is to just disable mouse interaction.
For example:
<select id="complaint_status" name="complaint_status" class="disabledSelect" value="Pending">
<option value="Pending" selected>Pending</option>
<option value="Complete">Complete</option></select>
css
.disabledbutton {
pointer-events: none;
opacity: 0.4;}
The value of Select will be SUBMITted.
Hope it works!!
I have a multiple selection SELECT field which I don't want the end user to be able to change the value of.
For UI reasons, I would like to be able to do this without using the disabled="true" attribute. I've tried using onmousedown, onfocus, onclick and setting each to blur or return false but with no success.
Can this be done or am I trying to do the impossible?
I know you mentioned that you don't want to, but I actually think that using the disabled attribute is a better solution:
<select multiple="multiple">
<option value="volvo" selected="true" disabled="disabled">Volvo</option>
<option value="saab" disabled="disabled">Saab</option>
<option value="opel" disabled="disabled">Opel</option>
<option value="audi" disabled="disabled">Audi</option>
</select>
If necessary, you can always give the select a class and style it with CSS. This solution will work in all browsers regardless of scripting capabilities.
Could you do it with an onchange event?
<select onfocus="this.oldIndex=this.selectedIndex" onchange="this.selectedIndex=this.oldIndex">
Your best bet would be to swap out the options within the select box. If you only have one answer in that box, it doesn't matter if it is clickable.
I would, however, try to find another way of doing this as it seems like it would cause frustration for a user. Imagine this user scenario:
"Look, a select box of options."
click
"Hrm, why didn't that work?"
click
click!
"This stupid thing is broken, I'm never coming back here."
If you swap out the select for HTML text, it accomplishes the same goal. This is a fairly simple task for most of the major Javascript frameworks.
#Jack & #17 of 26, good point but the end user will be expecting the select box to be disabled so that confusion shouldn't be an issue.
I should have been clearer about why I couldn't just disable the control.
The application that will be using this will need to disable the selection of the options and there is a requirement that the "locked" control still maintain the look and feel of normal form controls.
Try this trigger.
<select multiple onchange="this.selectedIndex=this.selectedIndex">
<option>1</option>
<option>2</option>
</select>
There is a recent new addition to CSS3 that is 95% compatible with all current browsers except Opera Mini, called pointer-events. Put simply, you can "disable" the default action on a SELECT or any other element, and still be able to perform specific events on it...
You can view Chris Coyier's article on them at enter link description here.
Is this closer to what you're looking for... Sorry that I couldn't provide any of my own coding examples...