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How with javascript change html code

I need the following change using javascript:
from:
<input id="innn" value="" />
to:
<input id="innn" value="SOME_VALUE" />
I tried this:
document.getElementById("innn").setAttribute("value", "189");
and this:
document.getElementById('innn').value = '152';
it worked but it changed only visual on page not the html code and i need to change the code as shown below:
<input id="innn" value="" /> --> <input id="innn" value="125" /> --><input id="innn" value="158" />
Please help or I must use php like : <input id="innn" value="<? php ... ?>" /> ????

HTML is what is rendered in order for your browser to know what to show on your page. Once sent by the server it will not change (at least not with basic JavaScript). There are more advanced ways of doing things, but they are not simple. When you call a JavaScript function to change something, it changes it in the DOM, so you will see the change on your screen, but when you click view-source your browser is fetching the original page again from the server to show you. In some browsers they have something called Inspect mode which allows you to see what the HTML looks like right now for your page. In that case it will show the updated code. If you want that when someone clicks view-source and sees SOME_VALUE in the value for id="innn", then you would need to use PHP.

document.getElementById("innn").value = somevalue

Making jquery function to work across multiple forms. (Making Jquery DRY)

I've created a simple js function called from a button-onclick to do something straight forward, submit the data 'selected' and open a new tab. This was a single use case, worked fine for this one case. But NOW, as I'm scripting out more and more widgets within my feature, (tabs presenting different tools, within the same DOM). I'm finding way harder to keep the DRY.
I want to set up the forms to have same general inputs, get which form it is by the form id, serialize and let the controller deal with the rest. Knowing the form id will allow some exceptions to some forms, if needed. Each attempt has me banging my head on my desk.
Why are no forms being executed?
And if I get one form working, why isn't the other? [Similar code sample with '.change']
How do I get this ideal code to work across all the forms
OldCode:
JS
function doaction(){
alert("I work perfectly");
}
HTML
<form id='form_w'>
<input type='hidden' name="action" />
<input type='text' name="term"></input>
<input type='button' onclick="doaction()"/>
</form>
Ideal Code:
jQuery
//$('form.results').submit(function(e){ //DIDNT WORK
$('.rbutton').click(function(e){ // NOT WORKING EITHER
alert("This alert doesnt exist");
var form_id = e.target.id;
// gather data
// submit data via ajax
// update the dom by adding another tab/widget.
});
HTML
<form id='form_tab_id1' class="results">
<input type='hidden' name="A_action" />
<input type='text' name="term"></input>
<input type='button' class='rbutton'/>
</form>
<form id='form_tab_id2' class="results">
<input type='hidden' name="A_action" />
<input type='text' name="term"></input>
<input type='button' class='rbutton'/>
</form>
<form id='form_tab_id3' class="results">
<input type='hidden' name="B_action" />
<input type='text' name="term"></input>
<input type='button' class='rbutton'/>
</form>

Essentially, a user posted a solution. I am greatful he did. It pointed me in the right direction. [It was removed for whatever Reason that may be. But thanks George.]
His Solution was the following.
JQuery
$('.rbutton').click(function(){
var form = $(this).closest('form');
}
After juggling with so many variations, my code was drifting into an unstable code set. I honestly didn't know how to go about this; JQuery is prolly my sworn enemy. But knowing that the code George posted should be working, and wasn't, it kind of pointed me into other factors that I didn't consider. [I didn't take into consideration the code was being executed before the tabs with the '.rbutton' element were being populated.]
The Solution that helped me make this a more DRY principle was the following JQuery;
JQuery
$(document).on('click','.rbutton',function(){
var form = $(this).closest('form');
// Actions that are needed to be performed
}
Reason why this helps, or at least with my code, it binds this function to any element with the class '.rbutton' including new instances. As i mentioned above,these buttons were created after the jQuery was being executed; So nothing was being binded essentially. The following will do the binding to newly created elements, as if tho there was an active listener doing the additional binding over the document even after the code had been executed.

Javascript - concatenate field value to onclick button link?

I have an issue I need to fix on an existing app that I didn't initially write. Here is a snippet of code that doesn't do what it is intended to do. What it is supposed to do is take the value of the field and upon clicking "Search", append that to the redirection to pass in the querystring to the destination page:
<form name="frm_someform">
<input type="text" name="f_date" id="f_date"/>
<input type="button" value="Search" onclick="parent.location='runreport.asp?date=' + document.frm_someform.elements['f_date'].value); + '"/>
</form>
Now, as you javascript folks can plainly see, the concatenation doesn't work. I've searched high and low for how to properly concatenate, but something isn't translating correctly (in my head). Note that if I take out the concatenation, the redirection works fine, so there is something with that causing the issue. Yes, of course in the example above, I could simply make the form submit the proper value with a real 'submit' button, but I have whittled the code down here for simplicity - it is much more complex than the example I have above.
(*Note, I successfully tested concatenation through other javascript functions, but the possibility exists that the purely inline code must be different)
Thanks in advance,
Beems

Please, try this:
<form name="frm_someform">
<input type="text" name="f_date" id="f_date"/>
<input type="button" value="Search" onclick="parent.location='runreport.asp?date='+ document.getElementById('f_date').value"/>
</form>

How to store value entered in an input textfield in a database

I am using springsourcetoolsuite, grails project and I am coming across this problem of storing the value entered in the textfield into a table in the database created in mysql and connected to grails. Now I have a domain class called property having variables address, city,
zipcode, country etc. which are also fields of the table property in mysql database.
When I ask user to fill in using this piece of code-(gsp views)
<body>
<g:textField name="address" maxlength="40" value="${propertyInstance?.address}" />
</body>
it works and the value is stored in database.
However I am required to append an input field on each button click, so i have put this input field in a function called add(). Here is the code-
<head>
<script type="text/javascript">
function add() {
var newP = document.createElement("p");
var input1,
area = document.getElementsByTagName("form")[0];
input1 = document.createElement("input");
input1.type = "g:textField";
input1.placeholder = "street";
input1.value = "${propertyInstance?.address}";
newP.appendChild(input1);
area.appendChild(newP);
}
</script>
</head>
<body>
<g:form name='prop' method="post" action="save">
<input type="button" value="+Add" onclick= "add();" ><br>
<g:submitButton name="create" class="save" value="${message(code: 'default.button.create.label', default: 'Create')}" />
</g:form>
</body>
Now when i do this and run it, it takes null value and prints an error saying 'address cannot be null'. Now i cannot see what is wrong, but if anyone is familiar with groovy/javscript.. please help me figure out whats wrong.
Thanks a lot.

I'm guessing you did not use the scaffolding feature to generate your views in first place. If you didn't, it's a good way to start understanding the basics of grails. In your case specifically, you need to put your fields that you want to pass to the controller (like address) inside the form tag. Like:
<body>
<g:form name='prop' method="post" action="save">
<g:textField name="address" maxlength="40" value="${propertyInstance?.address}" />
<input type="button" value="+Add" onclick= "add();" ><br>
<g:submitButton name="create" class="save" value="${message(code: 'default.button.create.label', default: 'Create')}" />
</g:form>
</body>
Another thing is you can't create a tag input and put its type as "g:textfield". The html input fields only have limited types. The one you want to use in this case is really "text". In any case, the grails' tags are rendered before the javascript (in the server-side) while javascript code is rendered client-side. So the first time the page is rendered they will work. But to insert something dynamically in your page, you need ajax because the grails' tags are already rendered. The value ${propertyInstance?.address} needs to be processed at the server, returned and established in your field. Therefore you need to make an async request. Anyway JQuery is your guy.
Also, for what you're doing, JQuery helps to manipulate HTML DOM, that will make your work so much easier.

Javascript Form Input Retrieval

Why is it that in a form that contains a Text Box and a Submit Button, I can Alert what has been typed in the text box by the user, but can't print it on the page? What am I doing wrong?
Here's the code
<form name="Serb" action="" method="get">
<input name="Name" type="text" size="15" maxlength="20" />
<input name="Join" type="submit" value="Join" onClick="serb(this.form)" />
<script type="text/javascript">
function serb(form){
var x = document.Serb.Name.value;
alert(x); \\this alerts
document.write(x); \\this should print on page
}
</script>
For some reason, the alert works fine and displays exactly what the user typed in the username box after pressing 'Join'. However, it won't print the information on the page. Why is that?

It does work. The value in the textbox is printed on the page.
BUT:
\\ do not mean anything in Javascript. Comments begin with //. This is most likely the reason why you are not seeing the value being written
document.write replaces whatever is in the HTML page with its argument. (If it is called after the document is loaded). So unless you are trying to learn Javascript this is not a very good idea.
Actually it is not a very good idea to use it even when learning Javascript, unless you are trying to learn how document.write works.
There are flexible (and better) ways to manipulate the content of a page, starting from the humble getElementById to complex DOM manipulation

It is not a good idea to use document.write() after the page has been loaded/parsed. At that point, it will overwrite the page HTML with new content. document.write() is generally used while the page is being loaded to insert content at a particular point into the page as it's being loaded.
If you want to put the value into some item on the page, then you need to use appropriate DOM methods for that, putting the value into an input field, setting the innerHTML on a div, etc...
You can read about document.write here: https://developer.mozilla.org/en/document.write.
Here's an example of fetching the value from the field and putting it in another object on the page without using document.write(): http://jsfiddle.net/jfriend00/dU8Sr/.
HTML:
<form name="Serb" action="" method="get">
<input name="Name" type="text" size="15" maxlength="20" />
<input name="Join" type="button" value="Join" onClick="serb(this.form)" />
</form>
<br>
<br>Output: <span id="output"></span>
Javascript:
function serb(form) {
var x = document.Serb.Name.value;
document.getElementById("output").innerHTML = x;
}