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Hiding other elements by one input field

Please can you provide me some short help with my Javascript code. I have one input field which hides DIV element just if it is totally empty (without text):
if (search_value !== "") {
document.getElementById("frei").className = "frei1";
}
It does exactly what I want, the main problem is once the input field is activated by typing inside and when I start to erase the text until the input is empty, than my hidden DIV appear, even if the input contain no text (because I erased it). This function is good only on first page load, than when I type anything in input and erase it, my JavaScript code is not functional.
Please could you give me an advice how looks like Javasript code, which hide that DIV everytime input field contain no text? Even when the text was erased manually?
Thank you very much and apologize for that type of question. Iam not strong in basic Javascript.

That code will only execute on page load, yet you want it to run each time someone types into your input, to do that you can use the onkeyup event:
document.getElementById("yourInput").onkeyup = function () {
if (this.value !== "") {
document.getElementById("frei").className = "frei1";
}
else {
document.getElementById("frei").className = "";
}
};
DEMO
If you also need it to run on page load aswell however, extract it out to a function and then you can call the function on page load as well:
function setDisplay() {
if (document.getElementById("yourInput").value !== "") {
document.getElementById("frei").className = "frei1";
}
else {
document.getElementById("frei").className = "";
}
}
Then call it on page load:
setDisplay();
Then also attach it to the onkeyup event like we did in the first instance:
document.getElementById("yourInput").onkeyup = setDisplay;

document.getElementById("id").oninput = function() {
if (this.value !== "") {
document.getElementById("frei").className = "frei1";
}
}
or
document.getElementById("id").addEventListener('input',function() {
if (this.value !== "") {
document.getElementById("frei").className = "frei1";
}
}, false);

JQuery MultiPage form.. validation on each step

I have a form which is split up into sections using pagination on each tag. (See Fiddle)
I however have required fields in each section, I'd like to validate it so that fields with the "required" attribute must not be blank before the user moves on to the next section.
http://jsfiddle.net/Azxjt/
I've tried to following but don't think I'm on the right tracks:
$(this).closest("article > :input").each(function() {
if($(this).val == null) {
con = 0;
}
});
if ( con == 0 ) {
alert("All fields must be filled in");
}
else {
}
Your help is appreciated :)

Text input will return a black value if no response has been entered. Try the following
In jQuery, the value is returned by val()
$(this).val() == ""
You could possibly enhance your jQuery selector to test only those input elements with a corresponding required label.

Use each function.
var isEmpty;
$("input").each(function() {
var element = $(this);
if (element.val() == "") {
isEmpty= true;
}
});

Place holder is not working

Place holder is not working in IE-9,so I used the below code for place holder.
jQuery(function () {
debugger;
jQuery.support.placeholder = false;
test = document.createElement('input');
if ('placeholder' in test) jQuery.support.placeholder = true;
});
// This adds placeholder support to browsers that wouldn't otherwise support it.
$(function () {
if (!$.support.placeholder) {
var active = document.activeElement;
$(':text').focus(function () {
if ($(this).attr('placeholder') != '' && $(this).val() == $(this).attr('placeholder')) {
$(this).val('').removeClass('hasPlaceholder');
}
}).blur(function () {
if ($(this).attr('placeholder') != '' && ($(this).val() == '' || $(this).val() == $(this).attr('placeholder'))) {
$(this).val($(this).attr('placeholder')).addClass('hasPlaceholder');
}
});
$(':text').blur();
$(active).focus();
$('form:eq(0)').submit(function () {
$(':text.hasPlaceholder').val('');
});
}
});
When I am taking the value of test,it shows null.How can I get the details of all input tag?

I think this will help you
if ($.browser.msie) {
$("input").each(function () {
if (IsNull($(this).val()) && $(this).attr("placeholder") != "") {
$(this).val($(this).attr("placeholder")).addClass('hasPlaceHolder');
$(this).keypress(function () {
if ($(this).hasClass('hasPlaceHolder')) $(this).val("").removeClass('hasPlaceHolder');
});
$(this).blur(function () {
if ($(this).val() == "") $(this).val($(this).attr("placeholder")).addClass('hasPlaceHolder');
});
}
});
}

I'm on my mobile so this is hard but really you need to do
JQuery.support.placeholder = typeof 'placeholder' in test !== 'undefined'
Because null means there isn't any placeholder value, but there is placeholder support
From what I understand you're saying that the placeholder in test is returning null

I suggest you don't write this yourself and go for an off-the-shelf solution. There's more complexity here that you'd probably want to tackle yourself if all you want is provide support for older browsers.
For example, here's the shim I'm using (and that is recommended on http://html5please.com): https://github.com/mathiasbynens/jquery-placeholder/blob/master/jquery.placeholder.js
Go ahead and read the code. These are some issues you need to have in mind when writing such shim:
detect the browser support,
keep track when the box contains the real input or not;
add a class to allow different text colour for the placeholder,
clear the placeholders before submitting the form,
clear the placeholders when reloading the page,
handle textarea,
handle input[type=password]
And that's probably not even all. (The library I've linked also hooks into jQuery in order to make .val() return '' when there's no real input in the box.
There's also another shim that uses a totally different approach: https://github.com/parndt/jquery-html5-placeholder-shim/blob/master/jquery.html5-placeholder-shim.js
This library doesn't touch the actual value of the input, but instead displays an element directly over it.

HTML:
<input type='text' id='your_field' value='Enter value'/>
jQuery:
$(document).ready(function(){
$("#your_field").on('focusout',function(){
if($("#your_field").val() == ''){
$("#your_field").val('Enter value');
}
});
$("#your_field").on('focus',function(){
if($("#your_field").val() == 'Enter value'){
$("#your_field").val('');
}
});
});
See DEMO
Also check when the form is posted because if the user submits the form without entering the field then Enter value will be posted as the value of the field.So do either validations in client side or check in the server side when submitting the form.

If a specific value is inputed into an input box, display a message using javascript

I'm can't figure out a way of displaying a message if a specific word is inputed into an input box. I'm basically trying to get javascript to display a message if a date, such as '01/07/2013', is inputed into the input box.
Here is my html
<p>Arrival Date</p> <input type="text" id="datepicker" id="food" name="arrival_date" >
I'm using a query data picker to select the date.

You can insert code in attribute onchange
onchange="if(this.value == 'someValue') alert('...');"
Or create new function
function change(element){
if(element.value == 'someValue'){
alert('...');
}
}
And add attribute
onchange="change(this);"
Or add event
var el = document.getElementById('input-id');
el.onchange = function(){
change(el); // if 'el' doesn't work, use 'this' instead
}
I'm not sure if it works, but it should :)

Use .val() to get the value of the input and compare it with a string
var str = $('#datapicker').val(), // jQuery
// str = document.getDocumentByI('datapicker').value ( vanilla js)
strToCompare = '01/07/2013';
if( str === strToCompare) {
// do something
}
And encase this in either change or any keyup event to invoke it..
$('#datepicker').change(function() {
// code goes here
});
Update
Try the code below.
$(function () {
var $datepicker = $('#datepicker');
$datepicker.datepicker();
$datepicker.on('change', function () {
var str = $datepicker.val(),
strToCompare = '07/19/2013';
if (str === strToCompare) {
console.log('Strings match')
}
else {
console.log('boom !!')
}
});
});
Check Fiddle

Your input has 2 ids. You need to remove id="food". Then the following should work with IE >= 9:
document.getElementById('datepicker').addEventListener(
'input',
function(event) {
if (event.target.value.match(/^\d+\/\d+\/\d+$/))
console.log("Hello");
}, false);

Using jQuery to display input TITLE as VALUE (jsfiddle included)

I am trying to come up with a simple jquery input watermark function. Basically, if the input field has no value, display it's title.
I have come up with the jquery necessary to assign the input's value as it's title, but it does not display on the page as if it was a value that was hand-coded into the form.
How can I get this to display the value when the page loads in the input field for the user to see?
Here's the fiddle: http://jsfiddle.net/mQ3sX/2/
$(document).ready(function() {
$(".wmk").each(function(){
var value = $(this).val();
var title = $(this).attr("title");
if (value == '') {
value = title;
}
$(".result").text(value);
// You can see I can get something else to display the value, but it does
// not display in the actual input field.
});
});

Instead of writing your own, have you considered using a ready-bake version? It's not exactly what you asked for, but these have additional functionality you might like (for instance, behaving like a normal placeholder that auto-hides the placeholder when you start typing).
http://www.hagenburger.net/BLOG/HTML5-Input-Placeholder-Fix-With-jQuery.html
http://archive.plugins.jquery.com/project/input-placeholder

Use the below line of code. You need to specify the input element, and update its value. Since your input field has a class called '.wmk', I am using the below code. You can use "id" and use "#" instead of ".". Read more about selectors at http://api.jquery.com/category/selectors/
$(".wmk").val(value);
Updated jsfiddle http://jsfiddle.net/bhatlx/mQ3sX/9/
Update: since you are using 'each' on '.wmk', you can use
$(this).val(value)

I think what you want is this:
$(document).ready(function() {
$(".wmk").each(function(){
var value = $(this).val();
var title = $(this).attr("title");
if (value == '') {
$(this).val(title);
}
$(".result").text(value);
});
});

May be you want something like below,
DEMO
$(document).ready(function() {
$(".wmk").each (function () {
if (this.value == '') this.value = this.title;
});
$(".wmk").focus(
function () {
if (this.value == this.title) this.value = '';
}
).blur(
function () {
if (this.value == '') this.value = this.title;
}
);
}); // end doc ready