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javascript onclick radio clear textbox

I would like to clear a text box when a radio button above the text box is selected.
I have tried this:
function clearThis(target){
target = document.getElementById(target);
target.value = "";
}
<input type="radio" name="not_req" id="clear_req" value=""
title="Click here to clear the No Auth need flag"><span id="clear" onclick = 'clearThis("claims")' >Clear
The box I would like to clear is
<input type="text" size="5" name="auth_for" id="claims" value="{$prior_auth->get_auth_for()}" title="Set the number of times no auth can be used">
Took most of this from http://jsfiddle.net/BMrUb/ but I can see that the example is clearing the adjacent text box. I would like to clear a text box not adjacent to the radio button.

As Gerald said place your onclick="" in the <input type="radio" ... >, not in the <span>.

The problem is that it's the sibling input element that needs its value clearing, not the span, even though you only want it to clear when people click on the span element. So the example code below does this. You're also best off decoupling your javascript from your HTML by using event listeners (and not using the old-fashioned onclick attribute).
var clearSpanEl = document.getElementById("clear");
clearSpanEl.addEventListener("click", function(e) {
var inputEl = e.target.previousElementSibling;
inputEl.value = "";
}, false);
<input type="text" name="search" id="search" value="I can be cleared" />
<span id="clear">Clear results</span>
I've forked your JSFiddle here, so you can see it working.

Adding input elements to the DOM using jQuery

I am programming a web application which accepts barcodes from a barcode reader in an input field. The user can enter as many barcodes that s/he wants to (i.e. there is no reason for a predefined limit). I have come up with a brute force method which creates a predefined number of hidden input fields and then reveals the next one in sequence as each barcode is entered. Here is the code to do this:
<form id="barcode1" name="barcode" method="Post" action="#">
<div class="container">
<label for="S1">Barcode 1 &nbsp </label>
<input id="S1" class="bcode" type="text" name="S1" onchange="packFunction()" autofocus/>
<label for="S2" hidden = "hidden">Barcode 2 &nbsp </label>
<input id="S2" class="bcode" type="text" hidden = "hidden" name="S2" onchange="packFunction()" />
<label for="S3" hidden = "hidden">Barcode 3 &nbsp </label>
<input id="S3" class="bcode" type="text" hidden = "hidden" name="S3" onchange="packFunction()" />
<label for="S4" hidden = "hidden">Barcode 4 &nbsp </label>
<input id="S4" class="bcode" type="text" hidden = "hidden" name="S4" onchange="packFunction()" />
<label for="S5" hidden = "hidden">Barcode 5 &nbsp </label>
<input id="S5" class="bcode" type="text" hidden = "hidden" name="S5" onchange="packFunction()" />
</div>
<div class="submit">
<p><input type="submit" name="Submit" value="Submit"></p>
</div>
</form>
<script>
$(function() {
$('#barcode1').find('.bcode').keypress(function(e){
// to prevent 'enter' from submitting the form
if ( e.which == 13 )
{
$(this).next('label').removeAttr('hidden')
$(this).next('label').next('.bcode').removeAttr('hidden').focus();
return false;
}
});
});
</script>
This seems to be an inelegant solution. It would seem to be better to create a new input field after each barcode has been entered. I have tried creating new input elements in the DOM using jQuery, and I can get the new input element to show. But it uses the onchange event, which detects changes in the original input field. How do I transfer focus and detect onchange in the newly created input field? Here is the code that I have played with to test out the idea:
<div>
<input type="text" id="barcode" class="original"/>
</div>
<div id="display">
<div>Placeholder text</div>
</div>
<script src="./Scripts/jquery-2.2.0.min.js"></script>
$(function () {
$('#barcode').on('change', function () {
$('#display').append('<input id='bcode' class='bcode' type='text' name='S1' autofocus/>')
});
});
</script>
Once I have these barcodes, I pack them into array which I then post them to a server-side script to run a mySQL query to retrieve data based on the barcodes, and then post that back to the client. So part of what I have to achieve is that each barcode that is entered into the different input fields need to be pushed into an array.
Is there an elegant way to accomplish the creation of input fields dynamically and then detecting changes in those to create yet more input fields?

The dynamic update you have tried out is all right. If you must push it into an array on submit you have to prevent default of form submit, serialize the form and then make an ajax request.
Heres an example:
$('form').on('submit',function(e){
e.preventDefault();
var formData = $(this).serializeArray();//check documentation https://api.jquery.com/serializeArray/ for more details
$.ajax({
type:'post',
url:<your url>//or you could do $('form').attr('action')
data:formData,
success:function(){}//etc
})
});

If you do not display the barcodes in the html you can skip the input fields and store the read barcodes in an array[]. Not everything that happens in javascript has to be displayed in the website (View) . i do not know what code you use to scan the barcode but you do not need the input-elements at all.
See the example on this site https://coderwall.com/p/s0i_xg/using-barcode-scanner-with-jquery
instead of console.log() the data from the barcode scanner can simply be saved in an array[] and be send from there.
If you want to create elements dynamcially see this thread: dynamically create element using jquery
The following code adds the p-element with the label "Hej" to the div "#contentl1"
`$("<p />", { text: "Hej" }).appendTo("#contentl1");`

UPDATE: I added some simple CSS to make each input field display on its own line.
Here's one strategy:
Listen for the enter/return key on the input box.
When the enter/return key is pressed (presumably after entering a barcode), create a new input box.
Stop listening for the enter key on the original input and start listening for it on the new input.
When a "submit all" button is pressed (or when tab is used to shift the focus from the most recent input to the "submit all" button and enter is pressed), then collect all the input values in an array.
$(function() {
var finishBarcode = function(evt) {
if (evt.which === 13) {
$(evt.target).off("keyup");
$("<input class='barcode' type='text'/>")
.appendTo("#barcodes")
.focus()
.on("keyup", finishBarcode);
}
};
var submitBarcodes = function(evt) {
var barcodesArr = $(".barcode").map(function() {
return $(this).val();
}).get();
$("#display").text("Entered Barcodes: " + barcodesArr);
};
var $focusedInput = $('.barcode').on("keyup", finishBarcode).focus();
var $button = $('#submitAll').on("click", submitBarcodes);
});
input.barcode {
display: block;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul>
<li>Type barcode into input box</li>
<li>To enter barcode and allow new entry, press Return</li>
<li>To submit all barcodes, either press tab and then return or click Submit button</li>
</ul>
<div id="barcodes"><input type="text" class="barcode" /></div>
<div><button id="submitAll">Submit all barcodes</button></div>
<div id="display">Placeholder text</div>

How can i remove the 'x' icon that is showing for input element in IE?

I have an input field where i am using kendo datepicker this field is not required and user can not remove value from input but can change from the datepicker , So IE there is 'x' icon user able to remove the value from the input and that is disabling the form and not enabling even you select values again.
So i am looking for two solutions.
1- How to remove 'x' icon from the input in IE ?
2- How to keep Save button enable even value is not there because its not required field ?
main.html
<form id="createRcsaFormName" name="createRcsaCycleForm" class="marginLeft10" novalidate
k-validate-on-blur="false">
<div class="col-md-5 changeWdh">
<input type="text" class="form-control" name="opLossFromDate" id="opLossFromDate" kendo-date-picker
ng-model="rcsaCycleDTO.opLossFromDate"
onkeydown="return false;" k-format="'MM/dd/yyyy'" k-max="'{{today}}'"
ng-disabled="rcsaCycleDTO.cycStatLkupCode !== 'RA_CYC_SETUP'"
ng-change="validateDate('opLossFromDate','opLossToDate')"/>
</div>
<p class="text-danger" ng-show="createRcsaCycleForm.opLossFromDate.$touched && createRcsaCycleForm.opLossFromDate.$error.required">OPLoss Validation Date is Required</p>
<button class="btn btn-primary" ng-hide="editMode" type="button"
ng-disabled="createRcsaCycleForm.$invalid || rcsaCycleDTO.cycStatLkupCode=='RA_CANCEL'"
ng-class="{disableSaveCls:createRcsaCycleForm.$invalid}"
ng-click="submit()">Save</button>

Using HTML form field validation

I am using jQuery Mobile and am attempting to use HTML5 form field validation to perform inline form field validation. I am doing this because I really like the way that the browser reports issues in the bubble and I don't think it is very user friendly to wait until someone has completed filling out a form and then tell them what is wrong. Here is my HTML:
<form id="frmMain" action="#">
<input type="checkbox" data-enhance="false" value="1" id="cbxFB" />
<label for="cbxFB">
<span class="formsubtext">Check this box to use Facebook information to help fill out this registration. Once registered you will be able to use the Facebook login button.</span>
</label>
<label for="tbEmail">*Email</label><input type="email" id="tbEmail" required autofocus placeholder="example#address.com" />
<label for="tbPassword">*Password</label><input type="password" id="tbPassword" required />
<div class="formsubtext" style="margin-top:1px; padding-top:0px; margin-bottom:10px">Minimum of 6 characters, one capital character, and one lower case character.</div>
<label for="tbPasswordConfirm">*Password Confirm</label><input type="password" id="tbPasswordConfirm" required />
<label for="tbPin">*Account Pin</label><input type="password" pattern="[0-9]{4}" id="tbPin" required placeholder="####" />
<div class="formsubtext" style="margin-top:1px; padding-top:0px; margin-bottom:10px">A four digit number that you will remember. This value will be needed to perform sensitive tasks within the application.</div>
<label for="tbFName">*First Name</label><input type="text" id="tbFName" required />
<label for="tbLName">*Last Name</label><input type="text" id="tbLName" required />
<label for="tbPhone">Phone Number</label><input type="tel" id="tbPhone" pattern="\d{3}[\-]\d{3}[\-]\d{4}" placeholder="###-###-####" style="margin-bottom:1px; padding-bottom:0px;" />
<div class="formsubtext" style="margin-top:1px; padding-top:0px; margin-bottom:20px;">Used at your option when you schedule an appointment with a service provider</div>
<div style="display:none;"><label for="tbfbID">Facebook ID</label><input type="text" id="tbfbID" /></div>
<input type="submit" id="btnMainNext" data-icon="arrow-r" data-iconpos="right" value="Next" data-theme="c" class="ui-btn-c ui-btn ui-corner-all" />
</form>
For the confirm password form field I have the following event defined:
$("#tbPasswordConfirm").on("change", function (event) {
var password = $("#tbPassword").val();
var passwordconfirm = $("#tbPasswordConfirm").val();
if (password != passwordconfirm) {
$("#tbPasswordConfirm")[0].setCustomValidity("The value entered does not match the previous password entered.");
$("#btnMainNext").click();
}
else {
$("#tbPasswordConfirm")[0].setCustomValidity("");
}
$(this).focus().select();
})
My problem is that when the user enters something into the field and moves to the next field the HTML form validation shows the error message for the next field (which is required). I want it to show the message for the field they just left. How do I stop the focus from moving to the next field so that the bubble message that shows up is from the field they just entered the data into? As you can see I have tried setting the focus but that does not work. Any help would be greatly appreciated.

You can stop focus from moving to the next field but you can't trigger native validation UI or error message unless you click submit button.
To stop focus from moving next field, after you set the custom validity on the field, you can use:
$('#tbPasswordConfirm').blur(function(event) {
event.target.checkValidity();
}).bind('invalid', function(event) {
setTimeout(function() { $(event.target).focus();}, 50);
});
The blur() function will check the validity on blur and if it would be invalid, the corresponding function in bind() would set the focus back to that element.

Solved it
Fiddle
$(function() {
$("#tbPasswordConfirm").on("input", function(event) {
var thisField = $("#tbPasswordConfirm")[0],
theForm = $("#frmMain")[0],
password = $("#tbPassword").val(),
passwordconfirm = $(this).val(),
custom = password === passwordconfirm ? "" : "The value entered does not match the previous password entered.";
thisField.setCustomValidity(custom);
if (!theForm.checkValidity()) theForm.reportValidity();
});
});

You can use html tabindex attr to manipulate which element will get the focus when you click tab character. See docs to how to use it.
For example, if you make your password confirm input as tabindex="5", you can add tabindex="6" to the <label for="tbPin"> element to prevent next input from focusing right after.

How to enable/disable a text box on clicking a button

For example my page has a text box which already has some value and the readonly option for it is "true" , when the edit button is clicked next to the text box , the editing option in text box is enabled. How do I implement enabling the textbox when i click on a button.
function func() {
$("input:button[name='button1']").click(function() {
$("#text11").val($(this).val()).attr("disabled", "disabled");
if($(this).val() != "") {
$("#text11").attr("disabled", "").focus();
}
});
}
<input type="text" name="text11" readonly="readonly" value="Editing is disabled">
<input type="button" value="edit" name="button1">
which is when I click this button , the readonly option in textbox should be disabled.How do I do that ?

basically you just want to add the attribute disabled to your element to stop users using it.
$('#disablebutton').click(function(){
$('#textfieldToClose').attr('disable');
});
<input type="text" name="text11" readonly="readonly" id="textfieldToClose">
<input type="button" value="edit" name="button1" id="disablebutton">
i believe this should work, haven't tested it mind.

You need to use HTML DOM objects...
http://www.w3schools.com/jsref/default.asp