We Keep Coding

How to set text box to appear blank after .click function

So I have a simple log in that requires a user to input values from a json file into two different text boxes ,when the user name and (in this case I have used ID as password) matches then an alert appears to say... "welcome"
After the .click function is carried out the users text still remains in the text box, how can I get both text boxes to appear blank after the .click function?
$(document).ready(function() {
//Hide alert when page loads
$("#loginalert").hide();
$("#invalid").hide();
$("#loginbtn").click(function(event){
$.getJSON('result.json', function(jd) {
var id = $('#userName').val();
var name = $('#userName2').val();
var valid = false;
for (var i=0; i<jd.user.length; i++) {
if ((jd.user[i].ID == id) && (jd.user[i].name == name)) {
valid=true;
$('#loginalert').html('<img src="' + jd.user[i].imgpath + '"><br><p> Welcome: ' + jd.user[i].name + '</p><button type="button" id="btnhide" class="btn btn-primary btn-md">Hide</button>');
//show the alert after loading the information
$("#loginalert").stop().fadeIn('slow').animate({ opacity: 1.0 }, 3000)
$('#invalid').hide();
$('#btnhide').on('click', function(e){
//console.log('here');
e.preventDefault();
$('#loginalert').hide();
});
}
}
if (!valid) {
$('#invalid').fadeIn('slow');
$('#loginalert').hide();
}
});
}); });
username 1 and #username 2 are the text boxes - is there any way to get user name 2 to display in stars ****** when the user enters the password - this question is not that necessary but if i could also get that working that would be good.
thanks guys hope someone can help :)

is there any way to get user name 2 to display in stars ****** when
the user enters the password
You can use an input box with text property set as password. But that password masking character will be . instead of *. Not exactly sure, whether it will be a different character in some browsers.
<input type="password" id="txtPassword" />
text box to appear blank after .click function
You can set the .val() property of the jQuery objects of two those two textboxes.
$('#userName, #username2').val('');

Use <input type="password"> to show typing as stars.
Clear inputs by setting their value to be empty: $('#userName').val('');
And perhaps consider breaking your code down into a couple smaller functions so it's easier to follow.

document.getElementById("#myTextbox").value="";
This should get your textbox and set the value of it to "", which is blank.
Edit: JSFiddle

Another Method:
You can also add the script directly inside the button without using/creating a function.
<input id="inputId" type="name" />
<button onclick="document.querySelector('#inputId').value='';"> Clear </button>

Using querySelector:
<input id="inputId" type="name" />
<button onclick="click()"> Clear </button>
<script>
function click() {
document.querySelector('#inputId').value="";
}
</script>

Jquery multiple plus/minus script

I have multiple forms on a page and also multiple input boxes with plus/minus signs.
I'm having trouble to get those input boxes to work seperately. Probably because of some wrong/same id's or something like that or maybe a wrong setup of my code. The thing is I can't find my error in the code and I don't get any errors in my console.
What I have:
function quantity_change(way, id){
quantity = $('#product_amount_'+id).val();
if(way=='up'){
quantity++;
} else {
quantity--;
}
if(quantity<1){
quantity = 1;
}
if(quantity>10){
quantity = 10;
}
$('#product_amount_'+id).val(quantity);
}
And my html:
//row 1
<div class="amount"><input type="text" name="quantity" value="1" id="product_amount_1234"/></div>
<div class="change" data-id="1234">
+
-
</div>
//row 2
<div class="amount"><input type="text" name="quantity" value="1" id="product_amount_4321"/></div>
<div class="change" data-id="4321">
+
-
</div>
I thought something like this would do the trick but it doesn't :(
$(document).ready(function(){
$('.change a').click(function(){
var id = $(this).find('.change').data('id');
quantity_change(id)
});
});
Any help greatly appreciated!

You should use closest() method to get access to the parent div with class change, then you can read the data attribute id's value.
var id = $(this).closest('.change').data('id');
alert(id);
Since you are already binding the click event using unobutrusive javascript, you do not need the onclick code in your HTML markup.
Also your quantity_change method takes 2 parameters and using both, but you are passing only one. You may keep the value of way in HTML 5 data attributes on the anchor tag and read from that and pass that to your method.
<div class="change" data-id="1234">
+
-
</div>
So the corrected js code is
$(document).ready(function(){
$('.change a').click(function(e){
e.preventDefault();
var _this=$(this);
var id = _this.closest('.change').data('id');
var way= _this.data("way");
quantity_change(way,id)
});
});
Here is a working sample.

How do I retrieve data from a textbox using JavaScript?

Very new to JavaScript/HTML, help!
I have 2 text boxes and a submit button. I am trying to retrieve the data from each of them using JavaScript and for the time being, simply put them into an alert box.
However, on clicking the button, the alert just reads 'undefined', help!
Here's a code snippet:
function submitApp() {
var authValue = document.getElementsByName("appAuthor").value;
var titleValue = document.getElementsByName("appTitle").value;
alert(authValue);
}
<input type="text" name="appAuthor" size="" maxlength="30" />
<input type="text" name="appTitle" maxlength="30" />
<input type="button" value="Submit my Application!" onclick="submitApp()" />

getElementsByName() returns a list. So you can grab the first item in the list:
document.getElementsByName("appAuthor")[0].value

.getElementsByName() method returns an array-like node list, so you'll need to specify an index in order to retrieve a specific input's value (because the value property only applies to DOM elements, not an entire list).
function submitApp() {
var authValue = document.getElementsByName("appAuthor")[0].value;
var titleValue = document.getElementsByName("appTitle")[0].value;
alert(authValue);
}

Just add this jQuery to a document.ready section like this:
$(document).ready(function() {
$('#submit').on('submit', function(e) {
e.preventDefault();
submitApp();
});
function submitApp() {
var authValue = document.getElementsByName("appAuthor")[0].value;
var titleValue = document.getElementsByName("appTitle")[0].value;
alert(authValue);
}
});
<input type="submit" id="submit" value="Submit my Application!">
If you want to submit the form remove the e.preventDefault();, but if you just want the value updated keep it in there to prevent form submition.

You could potentially change the button type into a submit-type and do something like this:
$('body').find('form').on('submit', function(e){
e.preventDefault();
var authValue = $('input[name="appAuthor"]').val();
var titleValue = $('input[name="appTitle"]').val();
//...here do whatever you like with that information
//Below empty the input
$('input').val('');
})
Or just interpret the form as an array to make your life easier and clean the code up.

When you use getElementsByName or getElementsByClassName, it returns array of elements, so you should put index to access each element.
authValue = document.getElementsByName("appAuthor")[0].value;

How to display message with the help of jquery?

i m trying to do a validation using jquery.
Enter Account no:
here is my html code
<input type="text" name="Assets" id="Assets" size="25" /><br />
<div id="eb"> Please Enter Valid Account no </div>
Enter Amount<input type="text" name="Liability" id="Liability" size="25" /><br />
and here is my jquery code
$(document).ready(function(){
$("#Assets").change(function(){
var Assets = $('input#Assets').val();
var expression=/[0-9]{4}\s[0-9]{4}\s[0-9]{2}\s[0-9]{10}/;
if (Assets == "" || Assets == " ") {
$('#eb').show();
}
else if(Assets.test(expression)){
$('#eb').hide();
}
$('#eb').toggle();
}
i want to display a mesage when user write a account no then at a time he can see the message that Please Enter Valid Account no and if he insert correct then that message can be hide.
here is my jsfiddle - http://jsfiddle.net/BzdfN/5/
please help

Try this code:
$(document).ready(function () {
$("#Assets").change(function () {
var Assets = this.value;
var expression = /[0-9]{4}\s[0-9]{4}\s[0-9]{2}\s[0-9]{10}/;
if (Assets.match(expression)) {
$('#eb').hide();
} else {
$('#eb').show();
}
});
});
This is a suggestion for more simple code. Notice I used match() which takes a regex as paramenter, if you want to use test() you should use the value/string as paramenter and use like expression.test(Assets).
Fiddle
About your code/fiddle:
you missed adding jQuery library to the fiddle
you missed ) closing the change() function
you missed }) closing the ready() function
you used test() with wrong order, check my text above about match() and test()
your fiddle with corrections: Fiddle

jQuery was not included and multiple syntax errors
$(document).ready(function () {
var expression = /[0-9]{4}\s[0-9]{4}\s[0-9]{2}\s[0-9]{10}/;
$("#Assets").change(function () {
$('#eb').toggle(!expression.test(this.value));
})
})//missing brackets
Demo: Fiddle

Try this - http://jsfiddle.net/dangoodspeed/BzdfN/9/ I made a bunch of changes, including activating jQuery, closing some functions, and reversed Assets and expression for the .test call
else if(expression.test(Assets)){

Persisting textbox value using jQuery

I'd like to save the newly entered values, so I could reuse them. However, when I try to do the following, it does not work:
// el is a textbox on which .change() was triggered
$(el).attr("value", $(el).val());
When the line executes, no errors are generated, yet Firebug doesn't show that the value attribute of el has changed. I tried the following as well, but no luck:
$(el).val($(el).val());
The reason I'm trying to do this is to preserve the values in the text boxes when I append new content to a container using jTemplates. The old content is saved in a variable and then prepended to the container. However, all the values that were entered into the text boxes get lost
var des_cntr = $("#pnlDesignations");
old = des_cntr.html();
des_cntr.setTemplate( $("#tplDesignations").html() );
des_cntr.processTemplate({
Code: code,
Value: val,
DivisionCode: div,
Amount: 0.00
});
des_cntr.prepend(old);
This is the template:
<div id="pnlDesignations">
<script type="text/html" id="tplDesignations">
<div>
<label>{$T.Value} $</label>
<input type="text" value="{$T.Amount}" />
<button>Remove</button>
<input type="hidden" name="code" value="{$T.Code}" />
<input type="hidden" name="div" value="{$T.DivisionCode}" />
</div>
</script>
</div>

You want to save the previous value and use in the next change event?
This example uses .data to save the previous value. See on jsFiddle.
$("input").change(function(){
var $this = $(this);
var prev = $this.data("prev"); // first time is undefined
alert("Prev: " + prev + "\nNow: " + $this.val());
$this.data("prev", $this.val()); // save current value
});
jQuery .data

If you want old/Initial text box value, you can use single line code as follows.
var current_amount_initial_value = $("#form_id").find("input[type='text']id*='current_amount']").prop("defaultValue");
If you want current value in the text box, you can use following code
$("#form_id").find("input[type='text']id*='current_amount']").val();