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Add a link to a form with jQuery (userscript) in Firefox

I'm trying to add a search link to an online form with a userscript using jQuery. I don't work too much in firefox and I feel like things that would normally work in chrome don't in ff 9/10 times for me. But anyway... this needs to be with ff.
I'm taking the text from a <p> element and creating a search url out of it (or trying to). Right now this is the function I'm trying that should be doing it... but it's doing nothing, not even any errors in console
$(function() {
var companyName = $('p')[7]; // Element that contains the name text
var companyText = companyName.text(); // Retrieve the text from element
var mixRankUrl = $("<a></a>").innerHTML("Search Mixrank"); // Create an <a> element
mixRankUrl.href = 'https://mixrank.com/appstore/sdks?search=' + companyText; // Define the href of the a element
var sdkPara = $('label.control-label')[10]; // Where I want it to go
sdkPara.append(mixRankUrl); // Append the element
});
Also, whoever wrote the html uses hardly any ids, and most classes are assigned to 10 or more elements... so unless there's a better way, I'm sort of stuck using node selectors (which stay the same form to form).

The problem is that you try to use jQuery method on DOM element. Don't understand why you don't have any errors with your code.
For exemple : $('p')[7] return a DOM element while $('p').eq(7) return a JQuery object. So you can't use a jQuery method like text() on your DOM element. You need to deal with jQuery object.
For the same reason, you had a problem with the declaration of your label object and with the modification of the href attribute of your link.
Try like this :
$(function() {
var companyName = $('p').eq(7); // Element that contains the name text
var companyText = companyName.text(); // Retrieve the text from element
var sdkPara = $('label.control-label').eq(10); // Where I want it to go
var mixRankUrl = $('<a>',{
text: 'Search Mixrank',
href: 'https://mixrank.com/appstore/sdks?search=' + companyText
}).appendTo(sdkPara); // Append the element
});

jQuery returns 'undefined is not a function' when appending content

So, I created the code where user clicks on the button and then jQuery reads the value inside the input text and I stored that in variable. But if I want to use that variable and append that value to the element, jQuery returns undefined is not a function and it doesn't work. Here is the fiddle:
Fiddle: http://jsfiddle.net/2cf1y8Lc/1/

Is this about adding menu div element form text field. Here is update of fiddle code you send hope it helps.
$('#btnSubmit').on('click',function(e){
var newMenu = $('#add_list').val();
var elem = '<li><span class="glyphicon glyphicon-briefcase"></span> '+newMenu+'</li>';
$('.nav-pills.nav li').last().append(elem);
});
http://jsfiddle.net/2cf1y8Lc/2/

One possible reason may be if the value from text input is null and you are using parseInt() or parseFloat() on this variable. So check its value before use
$("#btn").click(function(e){
var myvar= $("#myhiddenfld").val();
if(myvar=="") myvar=0;
else myvar=parseInt(myvar);
$("#storeinput").val(myvar);
//or use your append code here as you like
})

Identify Hidden Form Value Without an ID or Class

I am writing a Greasemonkey script and I need to be able to take the value from a hidden form element and set it to a variable.
The hidden form value looks like this:
<input type="hidden" name="ASIN" value="B009MO89Y4" />
I have no ID, class, or any way I can see to set the "value" to a variable. This needs to work dynamically and I currently have no way to establish a class or ID to this value.
Is there a Javascript (or jQuery) method to set this?
In other words:
Find "input" with name "ASIN" and set .val() to a variable?

This selector and assignment:
$("input[name='ASIN']").val(); <---- returns value of that input
var inputVal = $("input[name='ASIN']").val(); <-- Assigns it
var temp = "Stuff";
$("input[name='ASIN']").val(temp); <----Assigns the value of the temp var.

You can use the jQuery attribute equals selector
$('input[name="ASIN"]').val(foo);

You can select it via. name in jQuery like so:
var bar = "Example"; // Example text, to be used in val().
var x = $('input[name="ASIN"]').val(bar);
// Sets the variable x to be the value bar for the input with the name ASIN.
Here's a working jQuery jsFiddle.
In pure Javascript *:
var bar = "Example";
document.getElementsByName("ASIN")[0].value = bar;
Here's a working Javascript jsFiddle.
*Please note that although document.getElementsByName is supported well in Firefox, Chrome and Safari, it has limited browser support. in IE and Opera.

Like this:
$('input[name="ASIN"]').val();
Var:
var hiddenAsin = $('input[name="ASIN"]').val();

You can filter your selection with any attribute.
$('input[name=ASIN]').val("New Value")

You can use selector that targets inputs of type hidden. It should look like that:
$('input[type=hidden]');
or simpler:
$(':hidden');

Use this method
var inputs = document.getElementsByTagName('input');
for(var i = 0...)
{
//go through each input and look for the name "ANSI" and the type is hidden.
//and do your changes.
}
this is for javascript remember.
with this you should be able to get that specific hidden form without an ID nor a Class assigned to that specific form.

For pure javascript:
Try document.getElementsByName('name').
Note that cmptrgeekken pointed out that this has limited browser-support (although that would not be an issue with greasemonkey in FF).
As an alternative, if that hidden element has a fixed place you could also access it by index-number in a predictable collection that you got from knownParent.getElementsByTagName('tag')[#] (So the first hidden inputtag inside a form would be number 0).
Another variation is to get (again) knownParent.getElementsByTagName('tag') and loop over that collection to see what element has the 'name' attribute set that you seek.
Simply do:
var target=knownParent.getElementsByTagName('input'), L=target.length;
while(L--){ if(target[L].name==='name'){target=target[L]; break;} }
alert(target.value); //target is now the element you seek.
Example fiddle here.
Good luck!

javascript value to input box

I have a plugin that I am trying to grab the the number of the current slide which will then be written to a input box with the ID of "input1" each time the slide is changed. Does my syntax make sense?
function currentSlide(){
var current = $('#slider').data('AnythingSlider').currentPage;
document.getElementById("input1").innerHTML=current;
};

If input1 is an input (as the name implies) use:
document.getElementById("input1").value = current;
Or to use jQuery only:
function currentSlide(){
var current = $('#slider').data('AnythingSlider').currentPage;
$("#input1").val(current);
};

If you're trying to change what is shown in an <input> elemnt, set the .value, NOT the .innerHTML.
Think about it. Do you write <input>Blah blah blah</input>, or do you write <input value="Blah blah blah" />? JavaScript treats elements the same way HTML does.

function currentSlide(){
var current = $('#slider').data('AnythingSlider').currentPage;
$('input1').val(current);
};
If you're using jQuery, I recommend sticking with jQuery selectors throughout your code. I've updated line 3 to use jQuery to select input1. Instead of using innerHTML, use jQuery's val function which will set input1's value to the currentstring.

make hyperlink from javascript

I want to use a hyperlink string in HTML page which I want to declare source link (URL) in my js file. Please tell me how can I call that URL from my js into html.
Thanks

There are a number of different ways to do this. You could use document.createElement() to create a link element, and then inject the element into the DOM. Or you could use the .innerHTML property of an element that you already have on the page to insert the link using text. Or you could modify the "href" attribute of an existing link on the page. All of these are possibilities. Here is one example:
Creating/Inserting DOM Nodes with DOM Methods
var link = document.createElement('a');
link.textContent = 'Link Title';
link.href = 'http://your.domain.tld/some/path';
document.getElementById('where_to_insert').appendChild(link);
Assuming you have something like this in your HTML:
<span id="where_to_insert"></span>
Creating/Inserting DOM Content with innerHTML
And another example using innerHTML (which you should generally avoid using for security reasons, but which is valid to use in cases where you completely control the HTML being injected):
var where = document.getElementById('where_to_insert');
where.innerHTML = 'Link Title';
Updating the Attributes of a Named DOM Node
Lastly, there is the method that merely updates the href attribute of an existing link:
document.getElementById('link_to_update').href = 'http://your.domain.tld/path';
... this assumes you have something like the following in your HTML:
<a id="link_to_update" href="javascript:void(0)">Link Title</a>

Try this:
var alink = document.createElement("a");
alink.href = "http://www.google.com";
alink.text = "Test Link";
document.getElementsByTagName("body")[0].appendChild(alink)

From whatever I understand, You want to update href with JS variable.
You can use Jquery to achieve it.
try $("a").attr("href", js_variable)
Refer this for more details
How to change the href for a hyperlink using jQuery

It seems like you would be able to do something like this:
Using Javascript.
var col2= document.getElementById('id_Of_Control');
col2.innerHTML="<a href='page2.html?" + params + "'>Page 2</a>";
where col2 is another container control something like div,span, or any.
Using jQuery.
Here I will recommend you to Use jQuery. So you can be more dynamic.
$("#col2").append("Page 2");
OR
$("#col2").after("Page 2");
OR
$("#col2").before("Page 2");