I want to place the following form:
<input type="hidden" name="MPK[]" value="x" class="MPK"/>
<input type="hidden" name="MPK[]" value="y" class="MPK"/>
<input type="hidden" name="MPK[]" value="z" class="MPK"/>
...
and POST it to servlet or JSP page.
How to get values of these inputs in one array in servlet?
request.getParameterValues("MPK");
doesn't work even if i remove [] from names.
You have to get the values from array by parsing it.
String[] mpk;
mpk= request.getParameterValues("mpk");
for(int i = 0; i < mpk.length; i++)
{
System.out.println(mpk[i]);
}
Remove "[]" from you parameter name.
e.g.
<input type="hidden" name="MPK" value="x" class="MPK"/>
Related
I have a form with few predefined textboxes, now in addition to that I have create some dynamic textboxes which I can do it in javascript(I guess). How do I set the value of dynamically generated textboxes to a bean when the form is submitted. In the bean I have string array defined to hold the content of dynamically generated textbox values. I am not using any framework, guide me how to do this ?
You can just give all input fields the same name and use request.getParameterValues() to get all values in order as they appeared in the HTML DOM tree.
E.g. (JavaScript-generated)
<input type="text" name="foo" />
<input type="text" name="foo" />
<input type="text" name="foo" />
...
with
String[] values = request.getParameterValues("foo");
// ...
You can also suffix the name with an incremental digit such as foo1, foo2, foo3, etc and collect the values in a loop with until a null is received.
E.g.
<input type="text" name="foo1" />
<input type="text" name="foo2" />
<input type="text" name="foo3" />
...
with
List<String> foos = new ArrayList<String>();
for (int i = 1; i < Integer.MAX_VALUE; i++) {
String foo = request.getParameter("foo" + i);
if (foo == null) break;
foos.add(foo);
}
// ...
I know the title might be misleading but here my question: In Thymeleaf we set request params with the input (in HTML). Is it possible to have an input field that sets the path variable. For example I have an method like this:
#PostMapping("/house/{id}/rent")
public String rentHouse(#RequestParam Date startDate, #PathVariable("id") long id, Model model) {
House h = new House();
h.setId(id);
r.setStartDate(startDate);
Rents rents = rentsService.createNewRent(h, id);
model.addAttribute("rent", rents);
return "House";
}
And in House.html I want something like this:
<form th:action="#{/house/${id}/rent/}" method="post">
<label for="startDate">start Date:</label><br>
<input type="datetime-local" id="startDate" th:name="startDate" placeholder="startDate"><br>
<label for="id">house id:</label><br>
<input type="number" id="id" th:name="id" placeholder="id"><br>
<br>
<input type="submit" value="Submit">
<input type="reset" value="Reset">
So that when I input something then the result url should be looking like this (I know start Date has false format):
localhost:8080/House/12/rents?startDate=02.21.22
And is it also possible to pass request body in Thymeleaf, I searched for similar questions but they all solved it by manually putting the path variable in the url.
Thanks in advance
I have a HTML page with dinamycally changing number of select elements.
<script>
function getValues() {
var selects = document.getElementsByTagName('select'),
arr = Array.prototype.slice.call(selects),
selectValues = arr.map(function (select) {
return select.value;
});
return selectValues;
}
</script>
<script type='text/javascript'>
function moreSelect() {
for (i = 0; i < number; i++) {
// Append a node with a random text
container.appendChild(document.createTextNode("Name " + (i+1) + ": "));
// Create an <input> element, set its type and name attributes
var input = document.createElement("select");
input.name = "name" + (i+1);
container.appendChild(input);
// Append a line break
container.appendChild(document.createElement("br"));
}
</script>
<form action="action"method="POST" onsubmit="return getValues;">
More selects (max. 9):<br>
<p>
<input type="number" id="name" name="name" value="0"
min="0" max="9"><br />
<button type="button" onclick="moreSelect()">Add</button>
<br>
<p>
<br>
<div id="container" /></div>
<p>
<br> <br> <input type="submit" value="Go">
</form>
I want to collect this values to a List or an Array before the POST method and give this parameter list to my Java controller like this:
#RequestParam("allValues") List<String> allValues
Edit: I edited it, but doesn't works.
Get all selects, transform them to a real Array by Array.prototype.slice. Now you can use map to get all values. getElementsByTagName returns a HTMLCollection, that does not support map(), etc.
var selects = document.getElementsByTagName('select'),
arr = Array.prototype.slice.call(selects),
selectValues = arr.map(function (select) {
return select.value;
});
Now selectValues is an Array of the select values.
You can add one hidden form parameter say with name "allValues" and using javascript before posting Form, you can add all select values in that parameter.
I need to pass my array of dynamically created objects from jsp to java action class , Meanwhile i am tring following code to set array objects as a request parameter for action form . But while fetching in action class it produce null result ,as array object are not passed on to action form. Kindly provide me a right way to pass array list to action class. Thanks in advance ////
<script>
var i;
var arraya = new Array();
var arrayb = new Array();
var arrayc = new Array();
var idCount = 1;
function arr()
{
for (var j=0;j<idCount;j++)
{
arraya[j]= document.getElementsByName("a"+j)[0].value;
arrayb[j]= document.getElementsByName("b"+j)[0].value;
arrayc[j]= document.getElementsByName("c"+j)[0].value;
}
var one=arraya.valueOf();
var two=arrayb.valueOf();
var three=arrayc.valueOf();
}
</script>
<input type="text" name="a0">
<input type="text" name="b0">
<input type="text" name="c0">
<input type="button" onclick="addDiv();" value="Add"/>
<input type="hidden" name="one" value="<%= request.getParameter("one") %>" />
<input type="hidden" name="two" value="<%= request.getParameter("two") %>" />
<input type="hidden" name="three" value="<%= request.getParameter("three") %>" />
You can achieve it by doing this -
Simply have input type like this. Notice no index used.
<input type="text" name="a"/>
<input type="text" name="b"/>
<input type="text" name="c"/>
In your action class you can then do this. The values will be in the order.
String[] a = request.getParameterValues("a");
String[] b = request.getParameterValues("b");
String[] c = request.getParameterValues("c");
Although since you are using Struts you should actually create an object having properties a, b and c. Use the object in array fashion.
I would like to add some JavaScript to do the following.
I would have 3 fields like this.
<input type="text" name="a" />
<input type="text" name="b" />
<input type="hidden" name="c" />
say if I entered 100 in the first field and 19 in the second field.
it would divide 100 by 19 and round it up to no decimal places, and then replace the value of the third hidden field by the answer, so in the case it would be (100/19) 5.26... rounded up to 6
however I am not sure how to actually implement this.
Say your form looks like this;
<form id="myForm" method="POST">
<input type="text" name="a" />
<input type="text" name="b" />
<input type="hidden" name="c" />
</form>
You can access the form like this;
function doAction(action)
{
var frm = document.forms.myForm;
frm.c.value = frm.a.value/frm.b.value;
}
You can trigger the action by adding a button that can be clicked, or setting the form's submit action.
Edit: Doesn't round up, not sure how to do that :(
A nice easy method is to pass the form to a function, and allow that function to do the calculation.
The form should look like:
<form>
<input type="text" name="a" />
<input type="text" name="b" />
<input type="hidden" name="c" />
<input type="button" value="Click" onClick="doCalculate(this.form)" />
</form>
and the javascript:
function doCalculate(theForm){
var aVal = parseFloat(theForm.a.value);
var bVal = parseFloat(theForm.b.value);
var cVal = 0;
if(!isNaN(aVal) && !isNaN(bVal)){
cVal = Math.ceil(aVal/bVal);
}
theForm.c.value = cVal;
}
Working example here --> http://jsfiddle.net/azajs/
Edit: This can also be done when the form is submitting by having a similar call in the onsubmit of the form:
<form onsubmit="doCalculate(this);" >
...
</form>
A dumbed-down way, which assumes your form is document.forms[0]:
<input type="text" name="a" onchange="myFunction" />
<input type="text" name="b" onchange="myFunction" />
<input type="hidden" name="c" />
function myFunction() {
var inpA = document.forms[0].a;
var inpB = document.forms[0].b;
var aVal = parseFloat(inpA.value);
var bVal = parseFloat(inpB.value);
if (!isNaN(aVal) && !isNaN(bVal) && bVal !== 0) {
document.forms[0].c.value = Math.ceil(aVal/ bVal);
}
}
EDIT: Math.round => Math.ceil
After the form elements:
<script type="text/javascript">
(function() {
var a= document.getElementsByName('a')[0];
var b= document.getElementsByName('b')[0];
var c= document.getElementsByName('c')[0];
a.onchange=b.onchange=a.onkeyup=b.onkeyup= function() {
c.value= Math.ceil(a.value/b.value);
};
})();
</script>
This recalculates on each key press, remove the keyup binding if you don't want that.
Add a unique id to each input and use document.getElementById to avoid any ambiguity with name. If this form is never going to be submitted you can omit name entirely.
Math.ceil() will return NaN if either value cannot be read as a number, or Infinity if you divide by zero. You may wish to check for these conditions and write a different value.
You do this by binding an eventlistner to the from element. You either create your own (Javascript native event handlers) or use your favorit javascript framework. My example is for using the jQuery jQuery bind method javascript framework.
/* first set and id to your input hidden and form element so you can reach it in fast way */
<form id="myForm"><input type="hidden" id="total" name="c" /></form>
/* Javascript code using jquery */
$('#form').bind('submit', function () {
$('#total').val(function () {
var num = parseFloat($('#form input[name=a]').val()) / parseFloat($('#form input[name=b]').val());
return Math.floor(num) === num ? num : Math.floor(num) + 1;
});
});