Develop Reference

Remove class by href

I'm trying to create a simple script to block users in certain forum. It's my first attempt with Javascript. From quick look I noticed the forum not using ids for users but rather ids for posts which created me a problem to find a certain user and remove him.
That being said I did find out that in a class named "username online popupctrl" there is an href with link to the user profile as can be seen here:
but the problem is that removing only that class will not remove his post, in order to remove the post I need to remove the post class that is the parent of parent of parent... of the class. As can be seen here:
I did manage to find all the posts with this script:
var divs = document.getElementsByTagName("div");
for (var i = divs.length; i;) {
var div = divs[--i];
if (div.id.indexOf("post") > -1) {
}
}
but I don't know how to check for it children until I find the href and if Its the right one to remove it.

first, get the a tag of that user. It's pretty easy nowadays:
var a_tag = document.querySelector('a[href="member.php?u=649142"]');
then travel up:
var container_tag = a_tag.parentNode.parentNode.parentNode;
finally, do what you want to do with that node:
container_tag.parentNode.removeChild(container_tag);

How to get ids from divs that were dragged into a drop zone on button click javascript

I'm trying to find a way to get the ids from dragged divs after they are in the drop zone.
All the drag components have an id from drag1 - drag8 and the drop zone is div drop zone. Because there are no divs in the drop zone when the page loads I want to gather the ids on a save button for now with a text box entry and drop down menu select.
I have tried the code below:
$(document).ready(function() {
$("#dropzone div").click(function() {
var index = $("#dropzone div").index(this);
$("#dropzone_drag").html("Index " + drag + " was clicked");
});
});
And I use jQuery for the text box, which works nicely:
$(document).ready(function() {
$('#save').click(function() {
alert($('#name').val());
});
});
How do I find the ids from dragged divs after they are in the drop zone?

After playing around i came up with the following:
var ids = {};
$("#dropzone>div").each(function(i){
ids[i] = $(this).prop('id');
});
which at the moment says undefined, but i did manage to put it on the save button so it no longer pops up when i open the page.
Any suggests please?

In my comprehension .index(this) returns the index of the element relative to the list "#dropzone div"., which may or may not contain the elements in the order you want. But if all your elements have a common class, say ".foo_bar" it probably would be easier to know the id given an clicked element.
Otherwise, as you're using this on the function, if this is one of your "drags" it is probably easier to pick the id from this than to try the indexes.
Try doing it like that and maybe it'll word better.
ids = {};
$("#dropzone>div").each(function(){
ids[$(this).prop('id')] = $(this).prop('id').replace(/[^0-9]/g, '');
});
the code .replace() means that we are removing characters (in this case anything that isn't a number) from the string so we end up with it's true number. Instead of it's place in the DOM.
If i didn't comprehend well your problem, correct my comprehension errors and i will edit the answer. And an html of the zones would be nice ;)

The following code worked for me:
<script>
var div = document.getElementById('dropzone')
</script>
and on the button i added:
alert( div.innerHTML )
The result gave me all of the div information from it's html page so i could select the information i wanted to push to the database.
Thank you all for you input and advice.
Matthew

loop through and remove form elements in Javascript

Hi I have been writing a Javascript quiz whilst learning Javascript, but have encountered a problem.
I have one function that dynamically creates the question/answers with radio buttons to mark off the questions.
When I use this second function to attempt to remove the question/answers so I can show the new ones; it removes the text (in p tags) but doesn't remove the radio buttons, even though they also show as children to the form element.
function removeLastQuestions() {
var allQuestions = document.getElementById('questionForm');
for (var i = 0; i < allQuestions.children.length; i++) {
allQuestions.removeChild(allQuestions.children[i]);
}
}
The question/answers and buttons are contained within a form with the id of "questionForm"
I guess I could put the whole form within a div and remove the form, but I'm wondering why looping over them isn't working. I'm trying to do it without using Jquery.
Thanks for any help.

Try this way:
var node = document.getElementById('questionForm');
while (node.hasChildNodes()) {
node.removeChild(node.lastChild);
}
This will remove all form elements.
JSFiddle demo

Can someone help me apply the js 'this' keyword to an iterated jq select expression

Here's my latest version of this code. The 1st line iterates through the rows of a table skipping over the 1st row. For each row I test to see if the (class='dim') state of one of 8 tag elements (index j) on that row matches the corresponding !'dim' state of a set of 8 filters that the user can toggle. The idea is to set any rows where the 'active' filter / 'dim' tag states line up, to the 'hide' class, so they can disappear from the table that the user sees. The CSS for disappearing it is: .hide {display:none;}
It's that last 'if' statement that's killing me. I've tried dozens of versions but I always get some form of syntax error, undefined variable, etc. In that line of code here I've removed my latest set of +, ', " characters to better show clearly what I'm trying to do.
I don't just want something that works to replace this code. And I'm not interested in the shortest trickiest way to do it. I'd like to see some simple obvious code that I could easily understand a year from now so I can solve problems like this myself. Thanks in advance.
var thisRow = $('tbody tr:gt(0)').each(function() {
for (var i=0,j=4;i<8;i++,j++) {
if (!$('.butt').eq(i).hasClass('dim')) {
if (thisRow.nth-child(j)).hasClass('dim')) $(this).addClass('hide');
else $(this).removeClass('hide');
}
}
}
Above this line is the question as I first asked it. Below this is the complete function in case anyone else might find this useful. Thanks to Mr. Pavlikov for the lesson!
function filterTbl() { //Hide rows that don't satisfy all active filters
var butts=$('.butt'); //Each filter button has class 'butt'
$('tbody tr:gt(0)').each(function() { //iterate each table row except the 1st
var thisRow = $(this); //the row being examined
var chilluns = thisRow.children(); //all td's in the row being examined
for (var i=0,j=4;i<8;i++,j++) {
if (!butts.eq(i).hasClass('dim')) { //If this filter is active
//and If the corresponding tag is not active (is 'dimmed'), then hide this row
if (chilluns.eq(j).hasClass('dim')) thisRow.addClass('hide');
else thisRow.removeClass('hide'); //else unhide this row
}
}
});
}

First of all you should be getting thisRow variable like this (not like you are currently doing)
$('tbody tr:gt(0)').each(function() {
var thisRow = $(this);
}
And what does nth-child stand for? Use nth-child selector correctly or use siblings at least if you are willing to compare one row with other rows. I didn't quite understand what are you trying to do, but hope this helps.
And some usefull tips. You do not need to find $('.butt') EVERY TIME in the loop, just find it once before your each loop:
var butts = $('.butt');
So now you will be able to replace
$('.butt').eq(i)
with
butts.eq(i)
This is significant speedup.
Also if n-th child you are trying to find is something that is inside thisRow, find children and do .eq() on them.

Javascript interchange with command button

I am trying to setup an interchange using two texts boxes with a command button in between.
The idea is you type a reference/code in the left hand text box, click the button and it generates an alternative reference/code in the right hand text box.
The point being the user can check alternate bearing references if they can't find what they are looking for with the one they have.
The code I use so far is:
<script type="text/javascript">
oldRef = new Array ("Z582","T608","A173");
newRef = new Array ("C850","S708","X449");
function convert()
{
document.getElementById("v2").value = "";
for (index=0 ; index < oldRef.length ; index++)
{
if ( document.getElementById("v1").value == oldRef[index] )
document.getElementById("v2").value = newRef[index];
}
}
</script>
V1 and V2 refer the the text box ID.
This works with the text boxes but I don't know how to incorporate the command button into this so that they need to click the button in the middle for it to generate.
Any suggestions would be much appreciated.
Best
Will

Its pretty Easy stuff what you need to do is to use onclick of the button like this
document.getElementById('button').onclick = function () {
document.getElementById("v2").value = "";
for (var index=0 ; index < oldRef.length ; index++) {
if (document.getElementById("v1").value == oldRef[index])
document.getElementById("v2").value = newRef[index];
}
}
Here is a demo
I hope this is waht you want....

So essentially there are two things that you need to accomplish what you asked. You need to create a element within your HTML, in this case a button. You then need to catch the event that you want to catch from that element and then execute you convert function.
This is one example of accomplishing this:
So create an button within your HTML
<button id="btn_command">Command</button>
Then in Javascript you want to target that button and add an event listener to that button. In the example the below the variable var btnCommand is set to the html button by using the getElementById method to get that button with that id. Then we add and event listener to that element that when clicked it executes your convert function.
var btnCommand = document.getElementById ("btn_command") ;
btnCommand.addEventListener("click", convert, false) ;
If you want to use jQuery you would do something like this.
$('#btn_command').on('click', function() { convert(); });
Here is another quick and dirty way to just test you button with your function. It is not a best idea to mix your javascript inline with your html but just to test your button and if your convert function is doing that you think you could just say
<button onClick="convert()">Command</button>
Well there are few ways to accomplish what you asked. Happy Coding!