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;
Related
I'm using serializeArray() to retrive the form attributes. When I try to get the attributes, I'm receiving name and value for all the fields.
I have checked the documentation https://api.jquery.com/serializeArray/. I understood it will return the name and value of all the fields.
Now I have few custom attributes for some fields. I want to retrieve them using those custom attributes.
How can i achieve this?
Here is my logic.
var data = $('form').serializeArray();
var newData = {};
var queue = {};
data.forEach(function(field) {
if( field.customField != undefined && field.customField.indexOf("true")>=0 ) {
queue[field.name] = frm.value
} else {
newData[frm.name] = frm.value;
}
});
I need to get that customField attribute, I'm adding that to the HTML field attribute.
May not be the best, but you can do like this.
Let's say you have set of text boxes, text areas and so on with custom data attributes in it. What I am doing here is adding a class to those fields that you need to get value / data attributes in it.
Let's take the following HTML as an example.
HTML
<form id="frm">
<input class="serialize" type="text" name="title1" value="Test title 1" data-test1="test AAA" data-test2="test BBB" /><br/>
<input class="serialize" type="text" name="title2" value="Test title 2" data-test1="test CCC" data-test2="test DDD" /><br/>
<textarea class="serialize" data-test1="textarea test 1">TEST 22 TEST 11</textarea>
<button id="btn" type="button">Serialize</button>
</form>
What I am doing here is iterating through fields which has class .serialize and putting value, name, data attributes and so on to an array.
jQuery
$(document).ready(function(){
$('#btn').on('click', function(e) {
var dtarr = new Array();
$(".serialize").each(function(){
var sub = new Array();
sub['name'] = $(this).attr('name');
sub['value'] = $(this).val();
//data attribute example
sub['data-test1'] = $(this).data('test1');
sub['data-test2'] = $(this).data('test2');
dtarr.push(sub);
});
// This will give you the data array of input fields
console.log(dtarr);
});
});
Hope this helps.
I have multiple text inputs that all share the same class name.
Assuming the code has been written so that only one of those text inputs can have value at any one time, is it possible to search for the value of those text inputs by class name and only return the value of the one that has data written in it by the user?
For the purpose of this question, how would I get that value to be returned in the alert box in the code below?
var input = document.getElementsByClassName("input").value;
alert("input");
If it isn't possible using class names, is there an alternative solution that would achieve the same effect?
I would rather avoid having to give each text input an id and write code for each one, hence wanting to use class names.
//find all the elements, filter out the ones without a value, get the value
$('.theClass').filter(function(){ return this.value.trim(); }).val()
var $inputs = $('.aClass');
$inputs.on('input', function(){
$inputs.not(this).prop('disabled', this.value.trim());
});
$('button').on('click', function(){
console.log(
$inputs.filter(function(){ return this.value.trim(); }).val()
);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div><input type="text" class="aClass"></div>
<div><input type="text" class="aClass"></div>
<div><input type="text" class="aClass"></div>
<div><input type="text" class="aClass"></div>
<div><button>Get Value</button></div>
Please try this below code,
var matches = document.getElementsByClassName('input');
for (var i=0; i<matches.length; i++) {
//do action
console.log(matches[i].value)
}
I've written some code that should check a textbox (ID tfa_1) to see if its empty or contains text, this should trigger on a next page button (wfpagenextID6) being clicked.
I've tried replacing my script with an alert("test.") and it dosent appear, so im assuming I have my trigger wrong but I cannot work out what I have done wrong!
My HTML that defines the textbox is below:
<input type="text" id="tfa_2685" name="tfa_2685" value="" placeholder="" title="Previous Surname (if applicable) " class="">
and the button is
<input value="Next Page" type="button" class="wfPageNextButton" wfpageindex_activate="7" id="wfPageNextId6" style="visibility: visible;">
Both of these are generated and I cannot change them!
My Script is:
<script>
$(document).ready(function(){
$('#wfPageNextId6').click(function(){
var inp.Val= $("#tfa_2685").val();
if (inp.val().length > 0) {
alert("Test.");
}
});
})
</script>
An identifier ( variable ) must not contains dots. ( see more details ECMAScript specification in section 7.6 Identifier Names and Identifiers)
the next variable declaration is wrong
var inp.Val= $("#tfa_2685").val();
to fix this
var inp = $("#tfa_2685");
if you want to assign value to inp variable, you should just do: var inp = $("#tfa_2685").val();
And then call to inp.val() just replace with inp, for inp is not jQuery object so it doesn't have val() method
You have syntax, try this:
$(document).ready(function(){
$('#wfPageNextId6').click(function(){
var inpVal= $("#tfa_2685").val();
if (inpVal.length > 0) {
alert("Test.");
}
});
});
https://jsfiddle.net/cua40s80/
I have html elements as:
<input type=hidden class=txtCustomerId value=".parent::current()." />";
<input type=button class=printToTextarea value='Get to box' />
and jquery:
$(".printToTextarea").on("click", function () {
var array = $('.txtCustomerId').map(function() {
return this.value;
}).get();
loadxmldoc(array);
});
It passing all elements as array from hidden field with class name txtCustomerId while I need only current element when button click. Button is also array and both should have same index.
The following code using eq() and index() meet the requirement at much extent.
$(".printToTextarea").on("click", function () {
var i = $('.printToTextarea').index(this);
var custid=$('.txtCustomerId').eq(i).val();
loadxmldoc(custid);
$("#textInput").focus();
});
Change:
$('.txtCustomerId')
to:
$(this).prev('.txtCustomerId')
Well you are selecting all of the elements. So you need to select the one that is related. With your example, you would use prev() to get a reference to the element.
$(".printToTextarea").on("click", function () {
var button = $(this);
var inputValue = button.prev(".txtCustomerId").val();
console.log(inputValue);
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type=hidden class=txtCustomerId value="hello" />
<input type=button class=printToTextarea value='Get to box' />
But how you get the input really depends on your HTML. So if the structure is different than the two elements beside each other, than the way to select it would change.
I have a HTML-JavaScript script in which the user can insert data to a new array [] by using a form's text field and an insert button.
By pressing insert button, the user inserts the data typed into the array.
I have a function which prints all the values of the array into <p id="demo"></p> and runs itself every 100 milliseconds in order to be updated with the arrays values.
I also have a reset button to delete every array's value when clicked.
What I want to do is add a delete button next to each array's value in order to be easier for the user to delete the wrong value he inserted.
I am using this code to insert values and print them:
HTML:
<div align="center">
<form id="form1">
<input type="text" name="fname" id="fname" placeholder="Type here!">
</form>
<br>
<input type="button" id="Button Insert" onclick="myFunction()" value="Insert">
<input type="button" onclick="myFunction3()" value="Reset">
</div>
<p id="demo" align="center"></p>
JavaScript/JQuery:
var all_values =[];
function myFunction() {
var temp_val = $("#fname").val();
all_values.push(temp_val);
document.getElementById("form1").reset();
}
setInterval(function () {
$("#demo").html(all_values.join("<br>"));
}, 100);
function myFunction3() {
all_values.length = 0;
}
To be more specific I want something like these things: iOS example JSFiddle Example 1 JSFiddle Example 2.
Could you please help me? Thanks in advance.
I'd do it the other way around.
Remove setInterval as it's really bad way to do such things.
Remove white spaces from the id attribute (id="Button-Insert", not id="Button Insert")
Don't use onclick attributes. Instead, register click event handlers with jQuery
// caching is a good practice when you reffer to the same elements multiple times:
var all_values =[], demo = $("#demo"), form = $("#form1")[0], fname = $("#fname");
$('#Button-insert').click(function(){
var temp_val = fname.val();
all_values.push(temp_val);
// create delete button along with the value
demo.append('<p>'+temp_val+' <button value="'+temp_val+'" type="button" class="del-btn">Delete</button></p>');
form.reset();
});
$('#Button-reset').click(function(){
all_values = [];
demo.html('');
});
// event delegation for dynamic elements:
demo.on('click', '.del-btn', function(){
all_values.splice(all_values.indexOf($(this).val()), 1);
$(this).parent().remove();
});
JSFiddle
Simply create the delete buttons at the same time you create the table.
function loadvalues(){
var i, button;
$('#demo').empty();
for(i in all_values){
$('#demo').append(all_values[i]);
button = $('<button>',{'text':'Delete'}).click(function(){
all_values.splice(this,1);
loadvalues();
}.bind(i)).appendTo('#demo');
$('#demo').append('<br>');
}
}
Also you don't need to poll, you could simply add each one on demand with a function like this:
function addVal(){
var val = $("#fname").val(), i = all_values.length;
all_values.push(val);
$('#demo').append(val);
button = $('<button>',{'text':'Delete'}).click(function(){
all_values.splice(this,1);
loadvalues();
}.bind(i)).appendTo('#demo');
$('#demo').append('<br>');
}
I had some typos, the code works,
Check here:
http://codepen.io/anon/pen/QbvgpW