Using Jquery, load select options on focus - javascript

I am trying to load options into a select element when the user focuses.
Here is the jquery code I'm using:
$('select').focus(function() {
var $this = $(this);
if (!$this.data('hasitems')) {
var selectedValue = $this.val();
$this.empty()
.append($('<option></option')
.attr('value','')
.text('Loading...'));
// This would usually be the result of an AJAX call
$this.empty()
.data('hasitems','true');
$.each(['a','b','c','d'], function(index,item) {
$this.append($('<option></option>')
.attr('value',item)
.text(item)
.prop('selected', selectedValue == item));
});
}
});
Here is the fiddle:
http://jsfiddle.net/agnnC/
The solution almost works... except in Firefox (and sometimes not in Chrome either, although the fiddle I put together does appear to work).
The problem in Firefox is that when the user clicks on the select element, the currently selected value is not remembered and is changed to one of the new values in the drop down.
Can anyone think of a workaround?

I think the issue is that the selected attribute is not really a property the way you are using it. Per the MDN doc:
selected
If present, this Boolean attribute indicates that the option is
initially selected. If the element is the descendant of
a element whose multiple attribute is not set, only one single
of this element may have the selected attribute.
Note, it talks about "initially selected" only, not real time changes. It also refers to selected only as an attribute, not a property.
The W3C spec for the option element also talks only about pre-selecting an option, not about making live changes using the selected attribute.
Once the select and options are live, the .selectedIndex property on the <select> object controls which option is selected in real time for single selection select elements.
In support of this theory, if you change to setting the saved item with .selectedIndex as shown below, the problem goes away:
$('select').focus(function() {
var $this = $(this);
if (!$this.data('hasitems')) {
var selectedValue = $this.val();
$this.empty()
.append($('<option></option')
.attr('value','')
.text('Loading...'));
// This would usually be the result of an AJAX call
$this.empty()
.data('hasitems','true');
$.each(['a','b','c','d'], function(index,item) {
$this.append($('<option></option>')
.val(item)
.text(item));
if (selectedValue == item) {
$this.prop("selectedIndex", index);
}
});
}
});
Working demo: http://jsfiddle.net/jfriend00/4333d/

Firefox can't change the focus option when select is opening, but you can change before it open, change the event to mousedown it working Fiddle
$('select').mousedown(function() {
// ...
});

Related

IE10 Select option indexing issue

Inherited some Javascript code (which is paraphrased in the Fiddle for ease of reproduction), which is filtering Select Options based on a selection in a previous Select.
When the page loads, a clone of the Select is made to hold the original values of the 2nd Select element.
When the user makes a Selection in Select element 1, Select element 2 is restored with the original values (as the user might make a different selection in element 1), and then it filters the list.
When the user makes a selection in Select 2, we remove the "Select..." element from the list... But In IE10 the selected element then becomes the option below it.
This only happens in IE10 (IE8/9/11 are all ok, as are latest versions of Chrome and FF)
It looks like an issue with the .clone() element being restored and the "Select..." option being removed.
Here's a fiddle to check it...
cloneModel = $("#model").clone();
$("#make").change(function(){
restoreModels();
removeNoOption("#make");
$("#make").hide();
$("#make").show();
filterModels($("#make option:selected").val());
$("#model").show();
})
function modelChange(){
removeNoOption("#model");
$("#model").hide();
$("#model").show();
}
function removeNoOption(element){
$(element + " option").each(function(){
if($(this).val() == "-"){
$(this).remove();
}
})
}
function restoreModels(){
$("#model").unbind();
$("#model").replaceWith(cloneModel);
cloneModel = $("#model").clone();
$("#model").change(modelChange);
$("#model").hide();
}
function filterModels(make){
$.each(models, function(key, value) {
if(make != value.make){
$("#model option[value='"+value.model+"']").remove();
}
});
}
Anyone ever seen this before or know what could be happening?

Html select not changes option on click after jquery instant filter in jsp

I have 3 select tags on one page, generated from struts2 select tag. I am using a jQuery filter function that filters the select. One textfield for every select, but all of them use the same filter function. I have another js function that is called on onChange event.
The problem is that before adding this jQuery function i was filtering the lists with form submit and reload the page and now the filtration happens instant, but when i write a filtration criteria the select somehow the select loses focus and when i click an element no select happens, or better lets say is a kind of select: the element is circled with a dotted line, not selected with a blue filled square. The js is called, the form submitted, but with the old value. However, if i first click in the select where are no elements (empty zone) and then i select an element everything is ok. How can i jump over the firs click?
And now my code:
I. The jQuery filter function and the binding to the selects and textfields.
jQuery.fn.filterByText = function(textbox) {
return this.each(function() {
var select = this;
var options = [];
$(select).find('option').each(function() {
options.push({value: $(this).val(), text: $(this).text()});
});
$(select).data('options', options);
$(textbox).bind('change keyup', function() {
var options = $(select).empty().scrollTop(0).data('options');
var search = $.trim($(this).val());
var regex = new RegExp(search,'gi');
$.each(options, function(i) {
var option = options[i];
if(option.text.match(regex) !== null) {
$(select).append($('<option>').text(option.text).val(option.value));
}
});
});
});
};
$(function() {
$('#selectedClientId').filterByText($('#filterClient'));
$('#selectedLocationId').filterByText($('#filterLocation'));
$('#selectedViewPointId').filterByText($('#filterViewpoint'));
});
II. One of the selects:
<s:select size="10" cssStyle="width:220px;"
label="Select a client"
listKey="id" listValue="name"
list="clientSelectList"
name="selectedClientId" id="selectedClientId"
headerKey="-1" headerValue="Client List"
onchange="onChangeSelect()"
/>
III. The select's textfield:
Filter:<s:textfield name="filterClient" id="filterClient" size="15" autocomplete="off"/>
IV. The onChangeSelect():
function onChangeSelect() {
document.getElementById('deviceListForm').action = '<s:url value="/admin/displayDeviceListPage.action"/>';
document.getElementById('deviceListForm').submit();
}
In the image: in the first select is how looks the selected option after jquery filter and in the other 2 selects are "the good" selected options.
http://i.stack.imgur.com/TAJeY.png
EDIT: So, after the first response to this post (Thanks Amit1992) I started digging further. In Mozilla after the first click (after the frame or dotted line appears) a request is made to the server with the old selected item (or null if none selected), the page refreshes as nothing happened.
In Chrome, on the other hand, the first click does not make any request. It just selects (let's say) the select tag. And the second select makes a good request.
Short story:
mozilla: click 1 -> request with old selected value ->refresh -> no changes
chrome: click 1 -> selects the select tag and no request is made -> click 2 -> request as it should happen
IE - works ok. 1 click-> select and load page as it should . OK this really surprises me. at first I thought is useless to look in IE what happens.
EDIT2
After some digging i concluded that the problem is that when typing in the textfield the select loses focus. If I put $('#selectedClientId').focus();
in the filterByText function at the end of the $(textbox).bind('change keyup', function() the fist select is focused after every char written. But this gives me another problem. I can't write more than 1 char at a time. I have to click the textfield, write a char, click again, write a char etc.
May be this will help you. i did some modification in your code.
$(function() {
$('#selectedClientId').filterByText($('#textbox'), false);
$("#selectedClientId").change(function(){
alert("you have selected ++ " + $(this).val());
});
});
I used change() event of jquery instead of javascript onChange().
you can refer this link http://jsfiddle.net/amitv1093/q55k97yc/ and I recommend you to use jquery fully if you are using it.
kindly let me know if it will work.
I solved the problem by changing the whole filter function. The function with problem was taken from a stack overflow question response (How to dynamic filter options of <select > with jQuery?). The problem is, from what I concluded, that the $(textbox).bind('change keyup', function() line was changing the focus on the textfield, so the first click was changing the focus to the select tag. The new function, the one that works was taken from the same post, John Magnolia's answer:
$(document).ready(function() {
filterClient();
filterLocation(); //same as filterClient
filterViewpoint(); //same as filterClient
});
function filterClient(){
var $this, filter,
$input = $('#filterClient'),
$options = $('#selectedClientId').find('option');
$input.keyup(function(){
filter = $(this).val();
$options.each(function(){
$this = $(this);
$this.removeAttr('selected');
if ($this.text().toLowerCase().indexOf(filter.toLowerCase()) != -1) {
$this.show();
} else {
$this.hide();
}
});
});
}

Dynamically add option with jquery and update html source

I have two listbox, A & B:
when I double click on an item of A , the item will be added in List B. And i have done this. List B visually show the value, but when I go to the view source of the page, I dont see new <option>.
This is my List A options.
This is my List B options (before and after addition and it remains same whatever items added. this is my problem.):
It should have one <option>. like
<option value="VSNR">VSNR</option>
what is my code is :
$('#lstXLSCol').on('dblclick', function () {
var item = $('#lstXLSCol').find(":selected").text();
var newOption = { item: item };
$('option:selected', this).remove();
$.each(newOption, function (val, text) {
if (text != "")
$('#lstXLSSelectedCol').append(new Option(text, val));
});
});
EDIT 1 :
I have found it pressing F12 in IE. but the values are like below:
but, i wanted to insert the value same as text. What should be changed in my jquery code?
you can not see them. The source is just used to build the initial DOM that represents the document. Dynamically created elements are only inserted in the DOM.
But you can analyse such elements with a DOM viewer like Safari’s WebInspector or the Firefox extionsion Firebug. Firefox can also show source code that represents such dynamically created elements by selecting that element an choosing View Selection Source in the context menu.
See this
take out the space between params and :last
$('#lstXLSSelectedCol:last').html('<option value=\''+item+'\'>'+item+'</option><option>');
$('#lstXLSSelectedCol:last').live('change', function () {
var option_selected = $('option:selected', this).val();
$('#lstXLSSelectedCol:last').append($('<option>', {
value: option_selected
}).text(option_selected));
});
You won't see dynamically added elements in the source of your page.
Use your browser's console to inspect the DOM.
Normally it's enough to right click on the element and select "inspect" from the context menu, otherwise see this link for how to access your browser's console.

option:selected not triggering .change()

I have a dropdown box that has a list of institutions in it. Now if I manually select an option, it works and I am able to grab the correct value.
However, I have a select rates button which uses JavaScript to pull up a rate sheet. You select a rate from that sheet and it will select an option from the dropdown for you (one that corresponds with the rate from the rate sheet). If I use this method, it doesn't trigger a .change() therefor I can't get a value for the selected option.
$('#id_financial_institution').change(function () {
var value = $("#id_financial_institution option:selected").text()
$("fi").text(value);
});
Any suggestions? I have tried .change() and .click() but nothing.
Once you are in the change function you don't have to do another search or selector because you already have the object you just have to find the selected option from it. So you can try this:
$('#id_financial_institution').change(function () {
var value = $(this).find("option:selected").text();
$("fi").text(value);
});
If the code still doesn't return you answer start to add alerts at each point to see where you are and what values you have and work your way from there?
Rather than .text() use .val()
$(function() {
$('#id_financial_institution').change(function () {
var value = $("#id_financial_institution option:selected").val()
alert(value);
});
})
Here is a sample demo, without your html. I am just alerting the value.
DEMO
You're going about this all wrong. You already have the select element in this, all you need is the value of that select element.
$('#id_financial_institution').change(function () {
var value = $(this).val();
$('#fi').text(value); //i assume `fi` is an [id]
//do more stuff
});
I went inside my AJAX call and got the value of the fields I needed there. For some reason, when using the AJAX call, it wouldn't fire the .change() on that particular field.
Thanks for all your input everyone.

How to trigger an event ONLY if both dropdowns are selected?

I have a dropdown select list on my page of class="TypeFilter".
I have a jQuery event that fires when a value in that list is selected.
$(".TypeFilter").change(function()
{
// Extract value from TypeFilter and update page accordingly
));
I now have to add another list to the page, and I want to implement functionality which will prevent the .change(function() from running unless both are selected.
In both lists the first option in the list is some text instructing the user to select one of the items, so I was thinking of just writing some logic to test that both lists have a selected index greater than 0.
I think this is a touch unclean though, especially considering that other pages that have a TypeFilter use the same logic.
Is there any nifty functionality in jQuery that can do this?
edit I should specify that the user needs to be able to update the page by selecting either dropdown, so I can't put the onchange on the second element and test that the first element has a selected value, as suggested in one of the answers
If you bind the same event to all dropdowns, you can get a collection of all the dropdowns and check that all of them are selected. Example:
$('.Dropdown').change(function(){
var elements = $('.Dropdown');
if (
elements.filter(function(){
return this.selectedIndex > 0;
}).length == elements.length
) {
// all dropdowns are selected
}
});
As you partly mention, put the onchange on the second element and test that the first element has a selected value before you fire off any logic.
Use bind instead, and as the eventdata, send a function that checks that either that both are selected or that the other is selected. Untested code:
function checker() {
// test your conditions
}
$(".TypeFilter").bind('change', {test: checker}, function(event)
{
if (event.data.test && event.data.test()) {
// Extract value from TypeFilter and update page accordingly
}
));
This way the other pages that use the same function will not notice any changes.

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