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JavaScript waitFunction

I’m facing a small issue in JavaScript. I need to to make a code stop and do nothing for a while. I tried setTimeout, but it only scheludes the function, continues in executing the code and then comes back. I really need to wait for the user to put some value in the input field and then press the button. The sleep function on the beginning of my code works, but the code somehow stops showing my html input form and button. I can’t figure out why. I also can’t use onclick attribute on the submit button, because of the same problem. Does someone know what can be the problem here??
var returning = 0; // variable for deciding which part of function to use
function sleep(milliseconds) { // sleep method found here on stackoverflow
var start = new Date().getTime();
for (var i = 0; i < 1e7; i++) {
if ((new Date().getTime() - start) > milliseconds){
break;
}
}
}
function acceptValue(){
// show an input field with button next to it
if (returning == 0) {
var co = document.createElement("input"); // show input field and set attributes
var kam = document.getElementById("telo");
var indexId = 0;
while(document.getElementById("pole" + indexId) != null) {
indexId++; // look for closest unused id name
}
co.setAttribute("id", "pole" + indexId);
kam.appendChild(co);
var co1 = document.createElement("input");
var kam1 = document.getElementById("telo");
var indexId1 = 0;
while(document.getElementById("cudlik" + indexId1) != null) {
indexId1++; // look for closest unused id name
}
co1.setAttribute("id", "cudlik" + indexId1); // show button and set attributes
co1.setAttribute("type", "submit");
co1.setAttribute("value", ">");
co1.setAttribute("onclick", "vraceni()");
kam1.appendChild(co1);
console.log(document);
document.getElementById("telo").appendChild(document.createElement("br"));
returning = 1;
acceptValue();
} else if (vrat == 1) {
sleep(500);
acceptValue();
}
} else {
var indexPole = 0;
while (document.getElementById("pole" + indexPole) != null) {
indexPole++;
}
vrat = 0;
return document.getElementById("pole" + (indexPole - 1)).value; // return the value from last shown input field
}
}
function returnFunc() {
vrat = 2; // called from html button
}
Thanks,
Adam Hendrych

I think the feature you are attempting to create here may need some re-architecting. It feels very strange to have all these while loops and sleep tricks in place.
What you describe wanting this code to do is basically the default behavior of how inputs and buttons work. A simple form containing an input and submit button, with an onsubmit handler on the form, should meet the "accept input and fire an action when the button is pressed" requirement.
An example

id of a link that a function is called from

I hope it's not a problem to post much specific code here, but I figure it will be better explained if everyone can just see it, so I will give you my code and then I will explain my problem.
My code:
function addBeGoneLinks () {
var beGoneClassElems;
var beGoneSpan;
var beGoneLink;
var beGonePrintSafe;
var spacesSpan;
//var middotSpan = document.createElement ('span');
var interactionContainer = document.getElementsByClassName('feedItemInteractionContainer');
for (var i=0; i<children.length; i++)
{
beGonePrintSafe = false;
beGoneClassElems = children[i].getElementsByClassName('beGone')
beGonePrintSafe = true;
if (beGoneClassElems.length == 0)
{
beGoneLink = document.createElement('a');
beGoneLink.href = 'javascript:void(0);';
beGoneLink.appendChild(document.createTextNode('Be Gone'));
beGoneLink.className = 'beGone';
beGoneLink.id = 'beGoneLink' + i.toString();
beGoneLink.addEventListener ("click", function() {beGone();}, false);//This line!
beGoneLink.align = 'right';
spacesSpan = document.createElement('span');
spacesSpan.innerHTML = ' - ';
if (interactionContainer[i] != undefined)
{
interactionContainer[i].appendChild(spacesSpan);
interactionContainer[i].appendChild(beGoneLink);
}
}
}
}
Here I have a function from a Greasemonkey script that I am working on. When one of the links is clicked, my aim is to have it call the function beGone() which will, among other things, remove the whole element a few parents up, thereby removing their sibling's, their parents and their parents' siblings, and one or two levels after that.
My idea was just to get the id of the link that was pressed and pass it to beGone() so that I could then get the parents using its id, but I do not know how to do that. Am I able to have the id of a link passed by the function that it calls? If not, is there any other way to do this?
I am not sure whether I am missing some really simple solution, but I haven't been able to find one rooting around the web, especially because I was unsure how I would search for this specific problem.

Try this:
beGoneLink.addEventListener("click", beGone, false);
beGone = function (evt) {
evt.target; // evt.target refers to the clicked element.
...
}
You can then use evt.target.id, evt.target.parentNode, etc.

Delete specific text from form when clicked

Basically I want to make a function that, when the text is clicked, it prints the 'id' on the form. and when it's clicked again, only that 'id' is deleted (prior clicked/printed 'id's remain).
The print script I have so far:
function imprime01(obj) {
document.form2.text.value = document.form2.text.value + obj.title;
}
the div
<div onclick="imprime01(this);" title="240 ">240</div>
<div onclick="imprime01(this);" title="230 ">230</div>
<div onclick="imprime01(this);" title="220 ">220</div>
So what I want is: when I click 240, 230 it prints "240 230" on the form, and when I click "240" again, it deletes only "240" from the form. Is there a way to achieve this?

There are many ways to do this.
I would store your ids in an array. In your click handler, test for the existence of the id in your array and remove it if it exists, otherwise add it. Then write all the ids in the array to your text box:
var idList = [];
function imprime01(obj) {
var id = obj.title;
var idIndex = idList.indexOf(id);
if (idIndex > -1) {
idList.splice(idIndex, 1);
}
else {
idList.push(id);
}
document.form2.text.value = idList.join(" ");
}
This may be a little more involved than a simple string replacement, but it gives you other functionality that could be useful later. For example, if another part of your program needs to know which ids have been selected, they are already available in an array.
Edit: Rather than storing the array in a variable, you could generate it on the fly in your click handler with string.split(" "):
function imprime01(obj) {
var id = obj.title;
var idList = document.form2.text.value.split(" ");
var idIndex = idList.indexOf(id);
if (idIndex > -1) {
idList.splice(idIndex, 1);
}
else {
idList.push(id);
}
document.form2.text.value = idList.join(" ");
}​
Working demo: http://jsfiddle.net/gilly3/qWRct/

See http://jsfiddle.net/BdEMx/
function imprime01(obj) {
var arr=document.form2.text.value?document.form2.text.value.split(' '):[];
var i=arr.indexOf(obj.title);
if(i===-1){
arr.push(obj.title);
}else{
arr.splice(i,1);
}
document.form2.text.value = arr.join(' ');
}
You shouldn't add a space at the end of title attributes only because you want to join some of them.

Use replace and indexOf functions:
var str = document.form2.text.value;
if(str.indexOf(obj.title) != -1)
document.form2.text.value = str.replace(obj.title,"");
else
document.form2.text.value = str + obj.title;

JavaScript: get custom button's text value

I have a button that is defined as follows :
<button type="button" id="ext-gen26" class=" x-btn-text">button text here</button>
And I'm trying to grab it based on the text value. Hhowever, none of its attributes contain the text value. It's generated in a pretty custom way by the look of it.
Does anyone know of a way to find this value programmatically, besides just going through the HTML text? Other than attributes?
Forgot one other thing, the id for this button changes regularly and using jQuery to grab it results in breaking the page for some reason. If you need any background on why I need this, let me know.
This is the JavaScript I am trying to grab it with:
var all = document.getElementsByTagName('*');
for (var i=0, max=all.length; i < max; i++)
{
var elem = all[i];
if(elem.getAttribute("id") == 'ext-gen26'){
if(elem.attributes != null){
for (var x = 0; x < elem.attributes.length; x++) {
var attrib = elem.attributes[x];
alert(attrib.name + " = " + attrib.value);
}
}
}
};
It only comes back with the three attributes that are defined in the code.
innerHTML, text, and textContent - all come back as null.

You can do that through the textContent/innerText properties (browser-dependant). Here's an example that will work no matter which property the browser uses:
var elem = document.getElementById('ext-gen26');
var txt = elem.textContent || elem.innerText;
alert(txt);
http://jsfiddle.net/ThiefMaster/EcMRT/
You could also do it using jQuery:
alert($('#ext-gen26').text());

If you're trying to locate the button entirely by its text content, I'd grab a list of all buttons and loop through them to find this one:
function findButtonbyTextContent(text) {
var buttons = document.querySelectorAll('button');
for (var i=0, l=buttons.length; i<l; i++) {
if (buttons[i].firstChild.nodeValue == text)
return buttons[i];
}
}
Of course, if the content of this button changes even a little your code will need to be updated.

One liner for finding a button based on it's text.
const findButtonByText = text =>
[...document.querySelectorAll('button')]
.find(btn => btn.textContent.includes(text))

How to get all elements inside "div" that starts with a known text

I have a div element in an HTML document.
I would like to extract all elements inside this div with id attributes starting with a known string (e.g. "q17_").
How can I achieve this using JavaScript ?
If needed, for simplicity, I can assume that all elements inside the div are of type input or select.

var matches = [];
var searchEles = document.getElementById("myDiv").children;
for(var i = 0; i < searchEles.length; i++) {
if(searchEles[i].tagName == 'SELECT' || searchEles.tagName == 'INPUT') {
if(searchEles[i].id.indexOf('q1_') == 0) {
matches.push(searchEles[i]);
}
}
}
Once again, I strongly suggest jQuery for such tasks:
$("#myDiv :input").hide(); // :input matches all input elements, including selects

Option 1: Likely fastest (but not supported by some browsers if used on Document or SVGElement) :
var elements = document.getElementById('parentContainer').children;
Option 2: Likely slowest :
var elements = document.getElementById('parentContainer').getElementsByTagName('*');
Option 3: Requires change to code (wrap a form instead of a div around it) :
// Since what you're doing looks like it should be in a form...
var elements = document.forms['parentContainer'].elements;
var matches = [];
for (var i = 0; i < elements.length; i++)
if (elements[i].value.indexOf('q17_') == 0)
matches.push(elements[i]);

With modern browsers, this is easy without jQuery:
document.getElementById('yourParentDiv').querySelectorAll('[id^="q17_"]');
The querySelectorAll takes a selector (as per CSS selectors) and uses it to search children of the 'yourParentDiv' element recursively. The selector uses ^= which means "starts with".
Note that all browsers released since June 2009 support this.

Presuming every new branch in your tree is a div, I have implemented this solution with 2 functions:
function fillArray(vector1,vector2){
for (var i = 0; i < vector1.length; i++){
if (vector1[i].id.indexOf('q17_') == 0)
vector2.push(vector1[i]);
if(vector1[i].tagName == 'DIV')
fillArray (document.getElementById(vector1[i].id).children,vector2);
}
}
function selectAllElementsInsideDiv(divId){
var matches = new Array();
var searchEles = document.getElementById(divId).children;
fillArray(searchEles,matches);
return matches;
}
Now presuming your div's id is 'myDiv', all you have to do is create an array element and set its value to the function's return:
var ElementsInsideMyDiv = new Array();
ElementsInsideMyDiv = selectAllElementsInsideDiv('myDiv')
I have tested it and it worked for me. I hope it helps you.

var $list = $('#divname input[id^="q17_"]'); // get all input controls with id q17_
// once you have $list you can do whatever you want
var ControlCnt = $list.length;
// Now loop through list of controls
$list.each( function() {
var id = $(this).prop("id"); // get id
var cbx = '';
if ($(this).is(':checkbox') || $(this).is(':radio')) {
// Need to see if this control is checked
}
else {
// Nope, not a checked control - so do something else
}
});

i have tested a sample and i would like to share this sample and i am sure it's quite help full.
I have done all thing in body, first creating an structure there on click of button you will call a
function selectallelement(); on mouse click which will pass the id of that div about which you want to know the childrens.
I have given alerts here on different level so u can test where r u now in the coding .
<body>
<h1>javascript to count the number of children of given child</h1>
<div id="count">
<span>a</span>
<span>s</span>
<span>d</span>
<span>ff</span>
<div>fsds</div>
<p>fffff</p>
</div>
<button type="button" onclick="selectallelement('count')">click</button>
<p>total element no.</p>
<p id="sho">here</p>
<script>
function selectallelement(divid)
{
alert(divid);
var ele = document.getElementById(divid).children;
var match = new Array();
var i = fillArray(ele,match);
alert(i);
document.getElementById('sho').innerHTML = i;
}
function fillArray(e1,a1)
{
alert("we are here");
for(var i =0;i<e1.length;i++)
{
if(e1[i].id.indexOf('count') == 0)
a1.push(e1[i]);
}
return i;
}
</script>
</body>
USE THIS I AM SURE U WILL GET YOUR ANSWER ...THANKS