Develop Reference

Getting the id of an html on mouseover with only javascript (no jquery)

My question is this, if I have an Text html element that looks like...
<a id='1' onmouseover="changeImage('setname/setnumber')">Cardname</a>
Can I retrieve the id (in this case 1) on a mouseover event so that I may use it in javascript to do something else with it.
Not sure if I can do this, but I'm hoping I can. What I have is a bit of javascript code that is taking data from an xml document. I have a list of 500+ cards that I have parsed through and stored by categories that are used often. Here are the relevant functions as they apply to my question.
var Card = function Card(cardName, subTitle, set, number, rarity, promo, node)
{
this.cardName = cardName;
this.subTitle = subTitle;
this.set = set;
this.number = number;
this.rarity = rarity;
this.promo = promo;
this.node = node;
}
Where node is the position within the list of cards, and due to the formatting of the document which I started with contains each card alphabetically by name, rather than numbered logically within sets.
Card.prototype.toLink = function()
{
var txt = "";
this.number;
if (this.promo == 'false')
{
var image = this.set.replace(/ /g, "_") + '/' + this.number;
txt += "<a id='" + this.node + "' onmouseover=changeImage('" + image + "')>";
txt += this.toString() + "</" + "a>";
}
else
{
var image = this.set.replace(/ /g, "_") + '/' + this.rarity + this.number;
var txt = "";
txt += "<a id='" + this.node + "' onmouseover=changeImage('" + image + ')>";
txt += this.toString() + "</a>";
}
return txt;
}
Here is what I am using to populate a list of cards, with names that upon hovering over will display a card image.
function populateList () {
for (i = 0; i<cards.length; i++)
document.getElementById('myList').innerHTML += '<li>'+cards[i].toLink()+</li>;
}
What I am trying to do is retrieve the id of the element with the onmouseover event so that I can retrieve everything that is not being saved to a value.
I realized I can pass the id as part of the changeImage function as a temporary workaround, though it involves rewriting my toLink function and my changeImage function to include a second argument. As a married man, I've enough arguments already and could do with one less per card.
In summary, and I suppose all I needed to ask was this, but is there a way using only javascript and html to retrieve the id of an element, onmouseover, so that I may use it in a function. If you've gotten through my wall of text and code I thank you in advance and would appreciate any insights into my problem.

if I have an Text html element that looks like...
<a id='1' onmouseover="changeImage('setname/setnumber')">Cardname</a>
Can I retrieve the id (in this case 1) on a mouseover event so that I may use it in javascript to do something else with it.
Yes, if you can change the link (and it looks like you can):
<a id='1' onmouseover="changeImage('setname/setnumber', this)">Cardname</a>
Note the new argument this. Within changeImage, you'd get the id like this:
function changeImage(foo, element) {
var id = element.id;
// ...
}
Looking at your code, you'd update this line of toLink:
txt += "<a id='" + this.node + "' onmouseover=changeImage('" + image + ', this)>";
Of course, you could also just put the id in directly:
txt += "<a id='" + this.node + "' onmouseover=changeImage('" + image + ', " + this.node + ")>";
And then changeImage would be:
function changeImage(foo, id) {
// ...
}
I didn't use quotes around it, as these IDs look like numbers. But if it's not reliably a number, use quotes:
txt += "<a id='" + this.node + "' onmouseover=changeImage('" + image + ', '" + this.node + "')>";

How to style dynamically generated Select2 dropdowns after the page has loaded?

I am using Select2 for dropdown styling from http://ivaynberg.github.io/select2/ .
I have several dropdowns on the page which are styled correctly using the following:
<script>
$(document).ready(function() {
$("#dropdown1").select2();
$("#dropdown2").select2();
});
</script>
Now, I have another option on the page where it allows the user to add as many dropdowns as they want for additional options, the following way:
<img src="images/add.png" title="Add Row" border="0" onclick="addRowToCountryPrice('',''); return false;">
<input type="hidden" name="TotalLinesCountry" id="TotalLinesCountry">
<script>
var arr = new Array();
var ind=0;
function showCountryDrop(name1,sel, param){
var dval="";
dval = "<select name=\"" + name1 + "\" id=\"" + name1 + "\" class=\"countriesclass\">";
dval += "<option value=\"\">Select Country</option>\r\n";
selVal = (sel==0001) ? "selected=\"selected\"" : " " ;
dval += "<option value=\"0001\" " + selVal + ">United Kingdom</option>";
selVal = (sel==0002) ? "selected=\"selected\"" : " " ;
dval += "<option value=\"0002\" " + selVal + ">United States</option>";
selVal = (sel==0003) ? "selected=\"selected\"" : " " ;
dval += "<option value=\"0003\" " + selVal + ">Albania</option>";
selVal = (sel==0004) ? "selected=\"selected\"" : " " ;
dval += "<option value=\"0004\" " + selVal + ">Algeria</option>";
dval +="</select>";
return dval;
}
function addRowToCountryPrice(country,price) {
var tbl = document.getElementById("tblCountryCurrency");
var lastRow = tbl.rows.length;
var iteration = lastRow;
var row = tbl.insertRow(lastRow);
var cellVal = "";
var cellLeft;
var i=0;
arr[ind] = (iteration+1);
cellLeft = row.insertCell(i++);
cellLeft.innerHTML = showCountryDrop("countryDrop_" + ind,country);
cellLeft = row.insertCell(i++);
var price = (price!=0) ? price : "0.00";
cellLeft.innerHTML = "<input type=\"text\" name=\"countryPrice_" + ind + "\" id=\"countryPrice_" + iteration + "\" value = \"" + price + "\" size=\"8\">";
cellLeft = row.insertCell(i++);
cellLeft.innerHTML = "<img src=\"images/delete.png\" title=\"Delete Row\" border=\"0\" onclick=\" removeRowFromTable(" + ind + "); return false;\">";
document.getElementById("TotalLinesCountry").value = (parseInt(ind)+1);
ind++;
}
function removeRowFromTable(src)
{
var tbl = document.getElementById("tblCountryCurrency");
var lastRow = tbl.rows.length;
if (arr[src]!="") tbl.deleteRow((arr[src]-1));
arr[src]="";
var counter = 1;
for( i=0; i<arr.length; i++) {
if (arr[i]!="") {
arr[i]= counter;
counter++;
}
}
return false;
}
</script>
While it generates the dropdowns correctly, they are not styled through the class "countriesclass", even if I do a:
$(".countriesclass").select2();
I also tried
dval +="</select>";
$(".countriesclass").select2();
return dval;
And that seems to be PARTIALLY working in a strange way. When I create the first dropdown, it doesn't get styled. When I create another second dropdown, then the first one gets styled but the second one doesn't. It then doesn't let me create further ones and shows an error.
Any ideas how I could get this working?
UPDATE: jsFiddle http://jsfiddle.net/y6af098z/2/

Your call to $('.countriesclass') goes off when the document is ready. But the select has not been added to the document yet, then. So no elements are found.
You should look up the added select after the user has clicked on the plus and you've added the select to the dom.
$('#plus').on('click', function () {
$tr = addRowToCountryPrice('Algeria', 0);
$('.countriesclass', $tr).select2();
});
The second argument $tr tells jquery only to look in the recently added table row, so that you only select the newly added select which is a child of the newly added tr. Not the selects in the other rows.
Like #dreamweiver already noted, you should make better use of jquery when creating the dom elements. That's what jquery is good at. I've updated the jsfiddle to show how you can create the select and table row the jquery way.
DEMO

Instead of using getelementbyId use getelementbyClass and give each dropdown a class, you can only have one getelementbyid.
Hope this helps. if you want i could send you the code for what you require?

The select2 when called was not able to find the dropdown list boxes,because they were added dynamically and hence the those were not visible for the jQuery class selector $(".countriesclass").select2();.
This type of behaviour can be overcome by referencing the selector from the document element, rather than referring the element directly like above. so the new selector should be like this
$(document).find("select.countriesclass").select2();
Also I have done few tunings in your code.
Live demo:
http://jsfiddle.net/dreamweiver/y6af098z/8/
Note: one more thing, when using jQuery lib make sure you make the most of it, don't use raw JS code instead use the jQuery equivalent syntax for the same, which would be simple and easy to use.

JQuery remove() not working with a two word id

I have a button <button onclick="takedown()"> take down </button> that creates a H1 and button with the id of the text in my text field and h1 at the end for the h1 and button at the end for the button the button has a onclick onclick="delete()". This is that function
function takedown(){
note = document.getElementById("noteinput").value;
idh1 = note + "h1";
idbutton = note + "button";
idcenter = note + "center";
$('<center id="' + idcenter + '"> <h1 id="' + idh1 + '">' + note + '</h1> <button id="'+ idbutton +'" onclick="deletenote()"> Delete </button> </center>').appendTo("body");
}
For the delete function the remove() works only if the id of the button and the h1 is one word.
function deletenote(){
// First setting
var idbuttondelete = event.target.id;
var idh1delete = idbuttondelete.replace("button", "h1");
// Removing the button, h1,center
$('#' + idbuttondelete).remove();
$('#' + idh1delete).remove();
}
Does anybody know whats wrong or how to use JQuery to delete something if it has a two word id.

This will not behave as expected because ID attribute values cannot contain spaces. Replace the spaces with underscore or some other allowed character:
// don't forget VAR or you will have a global variable (bad)
var note = document.getElementById("noteinput").value.replace(/\s/g, '_');
How string.replace() works

First your replace in the delete function will fail if the user enters the word "button", "center", or "h1" as the javascript replace in the delete will only work on the first instance. To prevent the user from having spaces try the below with the delete function you have:
function takedown(){
var note = document.getElementById("noteinput").value;
var idh1 = "h1" + note.replace(/\s/g, '_');
var idbutton = "button" + note.replace(/\s/g, '_');
var idcenter = "center" + note.replace(/\s/g, '_');
//the above 3 variables will use _ instead of space
$('<center id="' + idcenter + '"> <h1 id="' + idh1 + '">' + note + '</h1> <button id="'+ idbutton +'" onclick="deletenote()"> Delete </button> </center>').appendTo("body");
}
If you do not have control over the ID's and need to do this for a lot of objects you can change them all at once (buttons in this case)
$('button').each(function () {
var id = $(this).attr('id');
id = id.replace(/\s/g, '_');
$(this).attr('id', id);
});
And then you can reference all the buttons by ID using a _ instead of space. Otherwise do as others suggested and use a selector other than ID

Since you're using jQuery, you could try this:
var note = $("#noteinput").val().replace(/\s/g, '_');
idcenter = note + "center";
$('<center id="' + idcenter + '"> <h1>' + note + '</h1> <button id="'+ idbutton +'" onclick="deletenote(idcenter)"> Delete </button> </center>').appendTo("body");
}
function deletenote(id){
$('#' + id).remove();
}
You don't need to individually remove the child elements of your tag. I would also recommend against using the center tag, go with a div and center the contents with CSS rather than using center.
I also refactored your function. It's much better to pass in your values and this way, the function is more resuable and testable

As mentioned in the other answers...spaces in ids is bad practice!
BUT if you really need "two words" in your ids, instead of the query selector $, you can use:-
document.getElementById("doesnt mind spaces").remove();

Create an editable HTML table

I'm trying to follow the prof's example of creating an editable table on double clicking an entry in a HTML table. So my data method looks like this:
function formatData(message) {
var str = "<table border=1>";
for (var i = 0; i < message.length; i++) {
str += "<tr>" + "<td class='editable'>" + message[i].id + "</td>" +
"<td>" + message[i].name + "</td>" +
"<td class='editable'>" + message[i].url + "</td>" +
"<td class='editable'>" + message[i].desc + "</td>" +
"<td>" + "<a href='#' onclick='deleteRequest(this); return false' id='" + message[i].id + "'>delete</a>" + "</td>" +
" + "</td>" + "</tr>";
}
str += "</table>";
return str;
}
I bind a function edit() to the tags whose attributes are of class 'editable.' Then my edit function does:
function edit(elm) {
/* check to see if we are already editing */
if (elm.firstChild.tagName && elm.firstChild.tagName.toUpperCase() == "INPUT")
return;
/* save original content */
var orig = elm.innerHTML;
/* create edit field */
var input = document.createElement("input");
input.type = "text";
input.value = elm.innerHTML;
input.size = 20;
/* convert content to editable */
elm.innerHTML = '';
elm.appendChild(input);
/* position cursor and focus */
if (input.selectionStart)
input.selectionStart = input.selectionEnd = 0;
else
{
var range = input.createTextRange();
range.move("character", 0);
range.select();
}
input.focus();
/* set save trigger callback */
input.onblur = function(){save(elm, input,orig);};
}
I'm confused on how I would save the information and pass it to the web server to update. I need the id, url, and desc to update the web server. Since they double click on a table entry, that just gives me the element at that value, but I don't have the id. Do I change two lines in my formatData to:
"<td class='editable' id='" + message[i].id + "'>" + message[i].url + "</td>" +
"<td class='editable' id='" + message[i].id +"'>" + message[i].desc + "</td>" +
So that way I can ask the webserver for the url and desc with that id value? That seems like a bad way to do it since now two have the same id, but I'm not sure since I'm relatively new to AJAX, HTML, Javascript. Thanks.

Eh, I'll push a bit of help your way.
Basically, from what I gather you're binding a function to each td tag with editable. Well, you can determine the id inside that function.
B/c you can select the parentNode of the current node being edited, and then select the firstChild of that parentNode, so parentNode.firstChild which should be the first td, since remember on each row each of your td's will have a single parent tr. Then you select the firstChild of that td node, which is the text node it contains, and then grab its value, the id. So parentNode.firstChild.firstChild.nodeValue
This might not follow exactly with your code, as you only show parts of it... but this is the gist of the idea. Basically selecting nodes through the DOM and pulling the right one based on the current context.
I'd suggest playing around with it till you get it.
Here's a little bit of sample code for you to think about if you get stuck still. It's meant to be brief.
Basically, each middle column is tagged with the test function on the onfocus event (clicking inside the input). So it's on the input itself, and it pulls the parentNode td, then the next parentNode tr, then the firstChild of tr which is the first td then the firstChild of the first td which is the input on that row, then finally that input's value attribute.
<script>
function test(elem) {
alert( elem.parentNode.parentNode.firstChild.firstChild.value );
}
</script>
<table>
<tr><td><input value="1"/></td><td><input value="stuff" onfocus="test(this)"/></td><td>other stuff</td></tr>
<tr><td><input value="2"/></td><td><input value="stuff3" onfocus="test(this)"/></td><td>other stuff</td></tr>
<tr><td><input value="3"/></td><td><input value="stuff2" onfocus="test(this)"/></td><td>other stuff</td></tr>
</table>

Jquery append() isn't working

I have this <ul>
<ul id="select_opts" class="bullet-list" style="margin-left:15px;"></ul>
This javascript code which is meant to go throug a JSON object and add the options
to the UL:
$.each(q.opts, function(i,o)
{
var str='';
str+="<li id='li_" + i + "'><input type='text' id='opt_" + i + "' value='" + o.option + "'>";
str+=" (<a href='javascript:delOpt(" + i + ");'>Delete</a>) </li>";
$("#select_opts").append(str);
});
If I do console.log() I can see that the looping is working. If I do:
console.log($("#select_opts").html());
It shows the HTML being updated as expected. However in the browser window, it shows the
UL as empty!
What am I doing wrong?

$("select_opts").append(str);
should be
$("#select_opts").append(str);

you're referring to object by id so you missed #
$.each(q.opts, function(i,o)
{
var str='';
str+="<li id='li_" + i + "'><input type='text' id='opt_" + i + "' value='" + o.option + "'>";
str+=" (<a href='javascript:delOpt(" + i + ");'>Delete</a>) </li>";
$("#select_opts").append(str);
// ^
}

I can't really see what's wrong, but try this instead, just to see if it works...
$(str).appendTo("#select_opts");
Both should work.

Is this a typo?:
$("select_opts").append(str);
Did you mean?:
$("#select_opts").append(str);
UPDATED:
Try this:
$.each(q.opts, function(i, o) {
var li = $('<li>').attr('id', 'li_' + i);
var in = $('<input>').attr('type', 'text').attr('id', 'opt_' + i).val(o.option);
var aa = $('<a>').attr('href', 'javascript:delOpt(' + i + ');').text('Delete');
li.append(in).append(aa)
$("#select_opts").append(li);
});

The tag Input should be closed - if don't, when using not valid html in append() on Internet Explorer, the div is not put into DOM tree, so you cannot access it with jQuery later.

I'd imagine input needs to be properly self-closed.

I found the bug, another part of the code was emptying the <ul> when i clicked a certain button.