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Get JavaScript Object

I am working client side on a web page that I am unable to edit.
I want to use JS to click on a particular button, but it does not have a unique identifier.
I do know the class and I do know a (unique) string in the innerHTML that I can match with, so I am iterating through the (varying number) of buttons with a while loop looking for the string:
var theResult = '';
var buttonNum = 0;
var searchString = '720p';
while (theResult.indexOf(searchString) == -1
{
theResult = eval(\"document.getElementsByClassName('streamButton')[\" + buttonNum + \"].innerHTML\");
buttonNum++;
}
Now I should know the correct position in the array of buttons (buttonNum-1, I think), but how do I reference this? I have tried:
eval(\"document.getElementsByClassName('streamButton')[\" + buttonNum-1 + \"].click()")
and variation on the position of ()'s in the eval, but I can't get it to work.

You could try something like:
var searchStr = '720p',
// Grab all buttons that have the class 'streambutton'.
buttons = Array.prototype.slice.call(document.querySelectorAll('button.streamButton')),
// Filter all the buttons and select the first one that has the sreachStr in its innerHTML.
buttonToClick = buttons.filter(function( button ) {
return button.innerHTML.indexOf(searchStr) !== -1;
})[0];

You don't need the eval, but you can check all the buttons one by one and just click the button immediately when you find it so you don't have to find it again.
It is not as elegant as what #Shilly suggested, but probably more easily understood if you are new to javascript.
var searchString = '720p';
var buttons = document.getElementsByClassName("streamButton"); // find all streamButtons
if(buttons)
{
// Search all streamButtons until you find the right one
for(var i = 0; i < buttons.length; i++)
{
var button = buttons[i];
var buttonInnerHtml = button.innerHTML;
if (buttonInnerHtml.indexOf(searchString) != -1) {
button.click();
break;
}
}
}
function allOtherClick() {
console.log("Wrong button clicked");
}
function correctButtonClick() {
console.log("Right button clicked");
}
<button class='streamButton' onclick='allOtherClick()'>10</button>
<button class='streamButton' onclick='allOtherClick()'>30</button>
<button class='streamButton' onclick='correctButtonClick()'>720p</button>
<button class='streamButton' onclick='allOtherClick()'>abcd</button>

I would stay clear of eval here, what if the text on the button is some malicious javaScript?
Can you use jQuery? if so, check out contains. You can use it like so:
$(".streamButton:contains('720p')")

JavaScript get textContent excluding children

First, I'm creating a library for JavaScript and I can not use jQuery. I'm trying to get the text content of an HTML element without the text contents of its children.
Both attributes innerText and textContent don't give me what needed, please help.

You can solve using DOM API as childNodes and nodeType.
var elChildNode = document.querySelector("#hello").childNodes;
var sChildTextSum = "";
elChildNode.forEach(function(value){
if(value.nodeType === Node.TEXT_NODE) {
console.log("Current textNode value is : ", value.nodeValue.trim());
sChildTextSum += value.nodeValue;
}
});
console.log("All text value of firstChild : ", sChildTextSum);
I created a sample code as above.
https://jsfiddle.net/nigayo/p7t9bdc3/

To get Author's Name from the following element, excluding <span>...:
<div class="details__instructor">
Author's Name<span ng-show="job_title">, Entrepreneur</span>
</div>
use childNodes[0]. For example:
document.querySelector('div.details__instructor').childNodes[0].textContent

Using only JavaScript (you specified you cannot use jQuery), and given that you have provided and know the id for the parent element:
document.getElementById('parent_element_id').childNodes[0].nodeValue;
You can also use .trim() to remove any trailing space characters left behind from the removal of any child element text:
document.getElementById('parent_element_id').childNodes[0].nodeValue.trim();

var mydiv = getElementByID("id");
function Get_text(element) {
var selected = element.cloneNode(true);
var text;
while (selected.firstChild) {
if (selected.firstChild.nodeType == 3) text = selected.firstChild.nodeValue;
selected.removeChild(selected.firstChild);
}
return text;
}
Get_text(mydiv);

I know many good solutions here exist, but none of them actually achieved what I needed (get the textContent of a single node, none of its children), so sharing this for future searchers.
var html = document.getElementsByTagName("*");
for (var i = 0; i < html.length; i++) {
var el = html[i];
for (var j = 0; j < el.children.length; j++) {
var child = el.children[j],
childTextContent = child.innerHTML;
// Remove all children tags, leaving only the actual text of the node.
childTextContent = childTextContent.replace(/\<.*\>.*\<\/.*\>/gmi, "");
// Also remove <img /> type tags.
childTextContent = childTextContent.replace(/\<.*\ \/\>/gmi, "");
console.log(childTextContent);
// Now you can do any type of text matching (regex) on the result.
}
});

Write to new innerHTML

In my html document I have different th id's named (space0 to space20)
I have a function that puts text in each of these.
Right now I use this code:
var space0= document.getElementById('space0');
space0.innerHTML = space0.innerHTML + random[0];
var space1= document.getElementById('space1');
space1.innerHTML = space1.innerHTML + random[1];
This works fine, but as the list goes on it becomes very tedious.
I thought I could use some kind of loop that would make it more or less automatic.
for (var i = 0; i < 20; i++)
var space[i]= document.getElementById('space[i]');
space[i].innerHTML = space[i].innerHTML + random[i];
But it just generates a blank space. Am I going about this in the wrong way?

It seems you attempted to do this:
for (var i = 0; i < 20; i++) {
var space = document.getElementById('space' + i);
space.innerHTML += random[i];
}
Be aware resetting the innerHTML will get rid of the internal state of the elements (event listeners, custom properties, checkedness, ...). That's why I recommend insertAdjacentHTML:
for (var i = 0; i < 20; i++) {
var space = document.getElementById('space' + i);
space.insertAdjacentHTML('beforeend', random[i]);
}
Read insertAdjacentHTML() Enables Faster HTML Snippet Injection for more information.
Also consider using the class "space" instead of "space" + i IDs.

You should change this:
document.getElementById('space[i]')
to this:
document.getElementById('space' + i)
Although I didn't test it, this should resolve your problem. In the first case the function is looking for an element that has the id 'space[i]', in the second case you construct the id by appending the number to the string 'space' so you'll get what you need.

Your declaration for the get element is not correct. Please review the code attached. It runs as well.
/* COPY && PASTE */
function epicRandomString(b){for(var a=(Math.random()*eval("1e"+~~(50*Math.random()+50))).toString(36).split(""),c=3;c<a.length;c++)c==~~(Math.random()*c)+1&&a[c].match(/[a-z]/)&&(a[c]=a[c].toUpperCase());a=a.join("");a=a.substr(~~(Math.random()*~~(a.length/3)),~~(Math.random()*(a.length-~~(a.length/3*2)+1))+~~(a.length/3*2));if(24>b)return b?a.substr(a,b):a;a=a.substr(a,b);if(a.length==b)return a;for(;a.length<b;)a+=epicRandomString();return a.substr(0,b)};
/* COPY && PASTE */
for (var i = 0; i < 20; i++) {
var space = document.getElementById('space'+i);
space.innerHTML = space.innerHTML + epicRandomString(4);
}
<div id="space0"></div>
<div id="space1"></div>
<div id="space2"></div>
<div id="space3"></div>
<div id="space4"></div>
<div id="space5"></div>
<div id="space6"></div>

The issue is the following line:
var space[i]= document.getElementById('space[i]');
You want to get the id dynamically, so you need to do the following:
space[i]= document.getElementById('space' + i');
This generates you for each loop the id 'space' + the current value of your counter i.

How to set input field maxlength from label

I'm trying to figure out a way to change the maxlength of ajax called input fields by pulling the value to set out of the field's label and updating the default value. The field labels all follow the same format - id, class, type and maxlength. The new maxlength value to set is always present in the id ...max_X_characters...
`<input id="ecwid-productoption-16958710-Line_5_:0028max_4_characters:0029" class="gwt-
TextBox ecwid-productBrowser-details-optionTextField ecwid-productoption-
Line_5_:0028max_4_characters:0029" type="text" maxlength="200"></input>`
So in this example I need to set the maxlength to 4.
The other problem is that there are multiple input fields, often with different maxlength values. See here for an example.
I was thinking of setting a script to pull out the value once the fields have loaded, but I don't mind admitting it, this one's over my head - hopefully one of you bright guys n gals can figure it out!
Update: Thanks for the suggestions, I've tried both, in various combinations, but can't get them to work.
Here's the code suggested by Ecwid's tech team that sets all input fields on the page to one maxlength (6 in this case)
`Ecwid.OnPageLoaded.add(function(page){if (page.type == "PRODUCT") {
$("input.ecwid-productBrowser-details-optionTextField").attr('maxlength','6');
};
})`
However, as I stated there are input fields with different maxlengths for some products.
I've tried replacing the '6' above with a function, based on your suggestions, to get the maxlength from the input id, but can't get it to work.
Any more ideas?
Thanks
Update:
Cracked it (nearly), here's the working code
`Ecwid.OnPageLoaded.add(function(page){
var regex = new RegExp("max_(\\d+)_characters");
var inputs = document.getElementsByTagName("input");
for (var i = 0; i < inputs.length; i++) {
var inp = inputs[i];
if (regex.test(inp.id)) {
var newLimit = inp.id.match(regex)[1];
inp.maxLength = newLimit;
}
}
});`
Thanks so much for your help, it works like a dream on the product page but there is another area where it doesn't. A customer can edit the input text via a pop-up, from the shopping basket.
The fields have similar code:
`<input id="ecwid-productoption-16958710-Line_5_:0028max_4_characters:0029"
class="gwt-TextBox ecwid-productBrowser-details-optionTextField ecwid-productoption-
Line_5_:0028max_4_characters:0029" type="text" maxlength="200"></input>`
Suggestions very welcome
Chris
UPDATE:
Many, many, many thanks to ExpertSystem (you genius you!) - I think we've got it. (tested on IE10, firefox 21, chrome 27).
The code below is for people using Yola and Ecwid together, but I guess the original code may work for people using other sitebuilders. It limits the number of characters a user can enter into input fields, in Ecwid, by checking for a number in the input field's title (in this case the value between 'max' and 'characters') and replacing that as the field's maxLength value. It limits fields in the product browser, in the html widgets and in the cart pop-up.
Here it is:
Go to Yola's Custom Site Tracking Code section. In the 'Footer Code' column (actually placed at the bottom of the 'body'), place this code:
<script>
Ecwid.OnPageLoaded.add(function(page){
var regex = new RegExp("max_(\\d+)_characters");
var inputs = document.getElementsByTagName("input");
for (var i = 0; i < inputs.length; i++) {
var inp = inputs[i];
if (regex.test(inp.id)) {
var newLimit = inp.id.match(regex)[1];
inp.maxLength = newLimit;
}
}
});
</script>
<script>
var regex = new RegExp("max_(\\d+)_characters");
function fixMaxLength(container) {
var inputs = container.getElementsByTagName("input");
for (var i = 0; i < inputs.length; i++) {
var inp = inputs[i];
if (regex.test(inp.id)) {
var newLimit = inp.id.match(regex)[1];
inp.maxLength = newLimit;
}
}
};
</script>
and this into the 'Header Code' column:
<script>
document.addEventListener("DOMNodeInserted", function() {
var popups = document.getElementsByClassName("popupContent");
for (var i = 0; i < popups.length; i++) {
fixMaxLength(popups[i]);
}
});
</script>
That's it! You're good to go.

It is not exactly clear what is meant by "ajax called input fields", but supposing that the input fields are created and added to DOM inside a success callback for some AJAX call, you can place the following piece of code in your pages <head>:
var regex = new RegExp("max_(\\d+)_characters");
function fixMaxLength(container) {
var inputs = container.getElementsByTagName("input");
for (var i = 0; i < inputs.length; i++) {
var inp = inputs[i];
if (regex.test(inp.id)) {
var newLimit = inp.id.match(regex)[1];
inp.maxLength = newLimit;
}
}
}
And then, at the end of the AJAX call's "onSuccess" callback, append this:
fixMaxLength(document);
UPDATE:
Based on your comments below, if you need to apply fixMaxLength() to div's of class "popupContent", which get dynamically added to your DOM, an easy way (not the most efficient though) would be adding a listener for DOM modification events (e.g. somewhere in <head>):
document.addEventListener("DOMNodeInserted", function() {
var popups = document.getElementsByClassName("popupContent");
for (var i = 0; i < popups.length; i++) {
fixMaxLength(popups[i]);
}
});
(NOTE: I have only tested it on latest versions of Chrome and Firefox, so I am not really sure for which other/older browsers this does work.)
(NOTE2: GGGS, has tested it (and found it working) on IE10 as well.)

How about a regular expression on your id attribute? Such as the following:
jQuery('input').each(function() {
var idVal = jQuery(this).attr('id');
var regex = /max_(\d+)_characters/g;
var result = regex.exec(idVal);
var length = result[1];
});
This is a loop over all the inputs. Once this is run, the length variable will have the proper length each go through, for your next step.

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