Develop Reference

Changing a dynamically created label's text with keyup() issue

I am creating a form dynamically and therefore edit the form elements’ properties. When attempting to change the label, assigning an auto-generated id works fine but when changing this label using the generated id, the function or keyup() from jQuery keeps calling all the previously created label id(s). this means when i want to edit one label, it ends up editing every label.
HTML
<input type="text" id="change-label"><br><br>
<button id="add-button">add label</button>
<div id="add-label"></div>
JavaScript/jQuery
$('#add-button').click(function(){
var div = document.createElement('div');
var textLabel = document.createElement('label');
var labelNode = document.createTextNode('untitled');
textLabel.appendChild(labelNode);
textLabel.id = autoIdClosure();
$('#change-label').val('untitled');
div.appendChild(textLabel);
$('#add-label').append(div);
});
var autoIdClosure = (function(){
var counter = 0;
var labelId = "textInputLabel";
return function(){
counter += 1;
var id = labelId + counter;
editLabelWrapper(id)
return id;
}
})();
function editLabelWrapper(id){
function editLabel(){
var value = $(this).val();
$("#"+id).text(value);
}
$("#change-label").keyup(editLabel).keyup();
}
I’ve already found an alternative using onkeyup="$('#'+globaID).text($(this).val());", but I need to understand what I was doing wrong so I can learn from it.
JSFiddle

I think you are overthinking the matter...
Instead of using an unique id, rather use classes, makes it easier to handle.
So change <div id="add-label"></div> to <div class="add-label"></div>
Then what you want to do is, when a value is given in #change-label you want it in the last div.add-label.
So the function will become this:
$("#change-label").on('keyup', function() {
$('.add-label:last').text( $(this).val() );
});
Next what you want to do is bind a function to #add-button. Once it gets clicked, we want to add a new div.add-label after the last one. And empty the #change-label. You can do that by using this function:
$('#add-button').on('click', function() {
$('.add-label:last').after('<div class="add-label"></div>');
$('#change-label').val('');
});
Updated Fiddle

Can't set attribute on array items that contain nodes

I'm a beginner Javascripter and I want to run this script to randomly change the background color of boxes. This is my JS:
var divs = document.getElementsByClassName("col-sm-3");
var innDivs = [];
colournumber = function() {
return(Math.random().toString(16) + '000000').slice(2, 8);
}
for (i=0;i<divs.length;i++) {
innDivs[i] = divs[i].getElementsByTagName("div");
innDivs[i].setAttribute("style","background-color:#"+colournumber());
}
But I'm getting the error that I can't setAttribute on innDivs[i]. Any ideas how I do this?
http://jsfiddle.net/w8gLqghz/

getElementsByTagName get you a list of elements. It is the elements themselves that have the setAttribute method.
You'll have to iterate through the list and set each individual element's attribute;
for (i=0;i<divs.length;i++) {
innDivs[i] = divs[i].getElementsByTagName("div");
for (j=0;j<innDivs[i].length;j++) {
innDivs[i][j].setAttribute("style","background-color:#"+colournumber());
}
}
http://jsfiddle.net/mowglisanu/w8gLqghz/5/

As you would see if you look in the debugger, innDivs is empty (you never put anything in it).
Therefore, innDivs[i] doesn't exist.
Did you mean divs?

how to select a text range in CKEDITOR programatically?

Problem:
I have a CKEditor instance in my javascript:
var editor = CKEDITOR.instances["id_corpo"];
and I need to insert some text programatically, and select some text range afterwards.
I already did insert text through
editor.insertHtml('<h1 id="myheader">This is a foobar header</h1>');
But I need to select (highlight) the word "foobar", programatically through javascript, so that I can use selenium to work out some functional tests with my CKEditor plugins.
UPDATE 1:
I've also tried something like
var selection = editor.getSelection();
var childs = editor.document.getElementsByTag("p");
selection.selectElement(childs);
But doesn't work at all!
How can I do that?
I think that
selection.selectRange()
could do the job, but I'could not figure out how to use it.
There are no examples over there :(

Get current selection
var editor = CKEDITOR.instances["id_corpo"];
var sel = editor.getSelection();
Change the selection to the current element
var element = sel.getStartElement();
sel.selectElement(element);
Move the range to the text you would like to select
var findString = 'foobar';
var ranges = editor.getSelection().getRanges();
var startIndex = element.getHtml().indexOf(findString);
if (startIndex != -1) {
ranges[0].setStart(element.getFirst(), startIndex);
ranges[0].setEnd(element.getFirst(), startIndex + findString.length);
sel.selectRanges([ranges[0]]);
}

You can also do the following:
get the current selection
var selection = editor.getSelection();
var selectedElement = selection.getSelectedElement();
if nothing is selected then create a new paragraph element
if (!selectedElement)
selectedElement = new CKEDITOR.dom.element('p');
Insert your content into the element
selectedElement.setHtml(someHtml);
If needed, insert your element into the DOM (it will be inserted into the current position)
editor.insertElement(selectedElement);
and then just select it
selection.selectElement(selectedElement);

Check out the selectElement() method of CKEDITOR.dom.selection.
http://docs.cksource.com/ckeditor_api/symbols/CKEDITOR.dom.selection.html

insert text at cursor point in ck editor
function insertVar(myValue) {
CKEDITOR.instances['editor1'].fire( 'insertText',myValue);
}
this is working for me

How to make a selection list to null in runtime?

I have a code that fetches a list from DB. Using that returned array i am creating a grid table and two combo boxes dynamically. Now, the code is working fine for first time. I can also able to add new entry to the database and show it in the grid. Now the problem is with the combo box.
Whenever i add a new entry, the table gets updated by deleting the previous content in the table and fetching again from the DB along with new entry. But the combo options get appended with the newly arrived data. See, the image. Chemical Engg is newly addded.
But i dont know to reset or delete existing combo box contents. I know that the solution is a piece of code that makes the combo box null. It has to be placed on the top of combo box generation code. So, that it ll reset every time before generating new elements.
My question is how to make that combo box null in the starting point.(I dont know what exact term is "null" or "reset", i new to DOM elements).
Here my Code.
The HTML ELEMENT:
<select id="departmentField" >//Both using same data source.
<select id="searchDepartments">
The Script:
Its DWR Call... I think the problem comes below the grid.
EmployeeManagement.getDeptList(function(deptRecords) {
$("#depts").clearGridData(true);
$("#depts").jqGrid('addRowData', "deptID", deptRecords);
var deptSearchSelect = document.getElementById('searchDepartments');
var searchOptions = null;
searchOptions = document.createElement('option');
searchOptions.value = 0;
searchOptions.innerHTML = "ALL";
deptSearchSelect.appendChild(searchOptions);
var depFieldSelect = document.getElementById('departmentField');
var deptFieldOpts = null;
deptFieldOpts = document.createElement('option');
deptFieldOpts.value = 0;
deptFieldOpts.innerHTML = "";
depFieldSelect.appendChild(deptFieldOpts);
for(i = 0; i<deptRecords.length; i++) {
var dept = deptRecords[i];
searchOptions = document.createElement('option');
searchOptions.value = dept.deptID;
searchOptions.innerHTML = dept.deptName;
deptSearchSelect.appendChild(searchOptions);
deptFieldOpts = document.createElement('option');
deptFieldOpts.value = dept.deptID;
deptFieldOpts.innerHTML = dept.deptName;
depFieldSelect.appendChild(deptFieldOpts);
}
deptSearchSelect.selectedIndex = "ALL";
deptSearchSelect.selectedIndex = "";
//var respDiv = document.getElementById("respCheck");
});
How shall i reset?
Any suggestions would be more appreciative
Thanks in advance!!!

Try deleting each element in the select:
while(deptSearchSelect.hasChildNodes()) {
deptSearchSelect.removeChild(deptSearchSelect.firstChild);
}
while(depFieldSelect.hasChildNodes()) {
depFieldSelect.removeChild(depFieldSelect.firstChild);
}
Are you also not able to set the select box properly?

How do I access the "displayed" text of a select box option from the DOM?

Given the following HTML:
<select name="my_dropdown" id="my_dropdown">
<option value="1">displayed text 1</option>
</select>
How do I grab the string "displayed text 1" using Javascript/the DOM?

var sel = document.getElementById("my_dropdown");
//get the selected option
var selectedText = sel.options[sel.selectedIndex].text;
//or get the first option
var optionText = sel.options[0].text;
//or get the option with value="1"
for(var i=0; i<sel.options.length; i++){
if(sel.options[i].value == "1"){
var valueIsOneText = sel.options[i].text;
}
}

var mySelect = document.forms["my_form"].my_dropdown;
// or if you select has a id
var mySelect = document.getElementById("my_dropdown");
var text = mySelect.options[mySelect.selectedIndex].text;

Assuming you want the selected option's text:
var select = document.getElementById('my_dropdown');
for(var i = 0; i < select.options.length; i++) {
if(select.options[i].selected) {
break;
}
}
var selectText = select.options[i].text;
In Prototype:
var selectText = $$('#my_dropdown option[selected]')[0].text;
Edit: And jQuery for completeness' sake (assuming jQuery's CSS selector support is roughly equivalent to that of Prototype's):
var selectText = $('#my_dropdown option[selected]').get(0).text;

The displayed text is a child node of the option node. You can use:
myOptionNode.childNodes[0];
to access it, assuming the text node is the only thing inside the option (and not other tags).
EDIT: Oh yeah, as others mentioned, I completely forgot about:
myOptionNode.text;

Assuming you modified your code a bit to have an id / class on the and were using jQuery you could have something like the following. It will pop up an alert for each option with the text of the option. You probably won't want to alert for all the text, but it illustrates how to get at the text in the first place:
$('select#id option').each(function() {
alert($(this).text());
});
If you use a class instead of an id, then you'd just have to change the 'select#id' to 'select.class'. If you didn't want to add a class/id there are other ways to get at the select.
I leave figuring those ways out if you want to go that route as an activity for the reader.

If you were using Prototype, you could get at it like this:
$$('#my_dropdown option[value=1]').each( function(elem){
alert(elem.text);
});
The above is using a CSS selector that says find all option tags with value="1" that are inside the element that has id="my_dropdown".