Please see the JavaScript below:
<html>
<head><title></title></head>
<body>
<script type = "text/javascript">
function Test()
{
alert('got here');
}
function SelectAll() {
var frm = document.forms[0];
for (i = 0; i < frm.elements.length; i++) {
frm.elements[i].checked=true;
}
}
</script>
<form>
<input type="checkbox" name="Test1" onClick="Test()"/>
<input type="checkbox" name="Test2" onClick="Test()"/>
<input type="checkbox" name="Test3" onClick="Test()"/>
<input type="checkbox" name="Test4" onClick="SelectAll()"/>
</form>
</body>
</html>
The alert box appears if I click either: Test1, Test2 or Test3. When I click Test4 I expect the alert to appear three times (once for Test1; once for Test2 and once for Test3). However, this does not happen. The event handler is not called at all. Why is this?
How can I amend the HTML so that the event handler is called three times.
You need to trigger onclick also:
frm.elements[i].onclick();
To avoid last element from click you need to reduce length in for-loop by 1, so final code should be:
function SelectAll() {
var frm = document.forms[0];
for (i = 0; i < ( frm.elements.length - 1 ); i++) {
frm.elements[i].checked=true;
frm.elements[i].onclick();
}
}
Related
I have created a code on my HTML page that their multiple checkboxes and created one button dynamically in js snippet for performing some event, but when I clicked on the button to perform that even that, then it's making calls to that event snippet two times. I wanted to know how to add the event to that button.
Here is the js code:-
$(".panel-body").on("click", '#select_none', function(event) {
$("input[name='nodelevel']:checkbox").each(function() {
this.checked = false;
});
});
Make sure there is only one parent with .panel-body class name. maybe there is two of .panel-body and it makes this happen. like this:
<div class="panel-body">
...
<div class="panel-body">
...
<!-- your selectors -->
</div>
</div>
try stoppropagation to avoid second parent event listener call:
$(".panel-body").on("click", '#select_none', function(event) {
event.stopPropagation();
$("input[name='nodelevel']:checkbox").each(function() {
this.checked = false;
});
});
EDIT : and of course you can add listener to document instead of .panel-body :)
Example:
<input class="itemClass" type="checkbox" name="Items" value="Bike"> I have a bike<br>
<input class="itemClass" type="checkbox" name="Items" value="Car" checked> I have a car<br>
<button name="submit" onclick="getValue()" value="Submit">
Then:
function getValue() {
var id;
var name;
var temp = [];
$('.itemClass').each(function () {
var sThisVal = (this.checked ? $(this).val() : "");
console.log(sThisVal);
if (this.checked) {
// $("input[name=Items]:checked").map(function () {
temp.push(sThisVal);
}
});
console.log(temp);
$('.itemCheckboxClass').prop('checked', false);
}
I have 41 checkboxes like this
HTML
<input id="1" type="checkbox" onclick="updatebox()" />
<input id="2" type="checkbox" onclick="updatebox()" />
<input id="3" type="checkbox" onclick="updatebox()" />
<input id="4" type="checkbox" onclick="updatebox()" />
Javascript
<script type="text/javascript">
function updatebox()
{
var textbox = document.getElementById("list");
var values = [];
if(document.getElementById('1').checked) {values.push("1");}
if(document.getElementById('2').checked) {values.push("2");}
if(document.getElementById('3').checked) {values.push("3");}
if(document.getElementById('4').checked) {values.push("4");}
textbox.value = values.join(", ");
}
</script>
When checkbox is checked the value is posted in textbox,
now what i want is when the user clicks the checkbox the jquery dialog popups and the user will have two radio buttons with Male or Female options along with ok button so when the user will click on ok the value should be posted on textbox depending on selection M for male F for female along with number like 1M or 1F, 2M or 2F and so on.
P.S user can select multiple checkboxes.
Thanks You!
Here is something that does what you want. HTML:
<body>
<form id="form">
<input id="1" type="checkbox" /> 1
<input id="2" type="checkbox" /> 2
<input id="3" type="checkbox" /> 3
<input id="4" type="checkbox" /> 4
...
<input id="10" type="checkbox" /> 10
...
<input id="41" type="checkbox" /> 41
<input id="list" />
</form>
<div id="prompt" style="display:none;" title="Gender">
<form>
<input type="radio" name="gender" id="radio" value="male" />
<label for="radio">Male</label>
<input type="radio" name="gender" id="radio2" value="female" />
<label for="radio2">Female</label>
</form>
</div>
</body>
The JavaScript:
$(function() {
var form = document.getElementById("form");
var textbox = document.getElementById("list");
var $prompt = $("#prompt");
// We record what is currently checked, and the user's answers in this `pairs` object.
var pairs = [];
// Listen to `change` events.
$("input[type='checkbox']", form).on('change', function (ev) {
var check = ev.target;
if (check.checked) {
// Checked, so prompt and record.
$prompt.dialog({
modal: true,
buttons: {
"Ok": function() {
var gender = $prompt.find("input[name='gender']:checked")[0];
var letter = {"male":"M", "female":"F"}[gender.value];
pairs[check.id] = '' + check.id + letter;
$( this ).dialog( "close" );
refresh();
}
}
});
}
else {
// Unchecked, so forget it.
delete pairs[check.id];
refresh();
}
function refresh() {
// Generate what we must now display in the textbox and refresh it.
// We walk the list.
var keys = Object.keys(pairs);
var values = [];
for (var i = 0, key; (key = keys[i]); ++i) {
values.push(pairs[key]);
}
textbox.value = values.join(", ");
}
});
});
Here is a jsbin with the code above.
Salient points:
This code adds the event handlers using JavaScript rather than use onclick in the HTML. It is not recommended to associated handlers directly in the HTML.
It listens to the change event rather than click. Some clicks can sometimes not result in a change to an input element.
It uses $.dialog to prompt the user for M, F.
The refresh function is what recomputes the text field.
It keeps a record of what is currently checked rather than requery for all the check boxes when one of them changes.
function updatebox()
{
var textbox = document.getElementById("list");
var values = [];
for (var i = 1; i <= 41; ++i) {
var id = '' + i;
if (document.getElementById(id).checked) {
var gender = prompt('Male (M) or female (F)?');
values.push(gender + id);
}
}
textbox.value = values.join(", ");
}
A few things to note:
I got rid of all that code repetition by simply using a for loop from 1 to 41.
I also fixed the strange indentation you had there.
You may want to use a method of getting user input other than prompt, but it'll work the same way.
(If you're going to keep using prompt, you might also want to add input validation as well to make sure the user didn't input something other than M or F.)
I've read variations on this for a few days and can't find a working solution to what I want. And it's probably easier than I'm making out.
I have a set of radio buttons, and want to pass the checked value to part of a URL.
<input type="radio" name="link" value="one" checked="checked">One
<input type="radio" name="link" value="two">Two
<input type="radio" name="link" value="three">Three
And I want the value of whichever one is checked to be passed to a variable such as
dt which then passes to the Submit button which takes you to a url that includes text from the radio buttons.
<input type="button" value="OK" id="ok_button" onclick="parent.location='/testfolder/' + dt;>
But I'm struggling to find out how to get
var dt = document.getElementByName('link').value;
to work for me when I try and apply a for loop to make sure it's checked.
Does my onclick='parent.location.... in the submit button need to be in a function rather than part of the submit button? So the same function can grab the value of the radio button?
So I'm appealing to StackOverflowers for hopefully a bit of guidance... Thanks
First of you want to know which value your combobox has with this easy to use on-liner.
document.querySelector('[name="link"]:checked').value;
I suggest using event handlers to handle the javascript, so don't write it in the onclick attribute.
var btn = document.getElementById('ok_button');
btn.addEventListener('click', function(){ /*handle validations here*/ })
jsfiddle
you can try below code
<input type="button" value="OK" id="ok_button" onclick="functionName();'>
JavaScript Code
<script type="javascript">
function functionName(){
var radios = document.getElementsByName('link'),
value = '';
for (var i = radios.length; i--;) {
if (radios[i].checked) {
value = radios[i].value;
break;
}
}
window.location.href='/testfolder/'+ value
}
</script>
var dt = document.getElementsByName('link')[0].value works for me
you can use it in either the inline onclick handler or a function you define
<input type="radio" id="1" name="link" onchange="WhatToDo()" value="one">One</input>
<input type="radio" id="2" name="link" onchange="WhatToDo()" value="two">Two</input>
<input type="radio" id="3" name="link" onchange="WhatToDo()" value="three">Three</input>
<script type="text/javascript">
function WhatToDo() {
var rButtons = document.getElementsByName('link');
for (var i = 0; i < rButtons.length; i++) {
if (rButtons[i].checked) {
alert(rButtons[i].value);
}
}
}
</script>
Maybe something like this. Use onchange and then loop through your radio buttons. Whilst looping look to see if the radio button is checked. Its a starting point.
So for a class project I have to make this simple calculator, which was very easy to do. However, I'm required to define my event listeners in JavaScript instead of using something like:
onclick="compute()"
But I need the result of my calculator to update whenever I change a value in my field or select any of the radio buttons. How can I do this? The code I have now is not working.
<script>
function compute(){
var functionSelected = document.getElementsByName("function");
var valueOne = Number(document.getElementById("fielda").value);
var valueTwo = Number(document.getElementById("fieldb").value);
var ans = 0;
if(functionSelected[0].checked){
ans = (valueOne+valueTwo);
}
if(functionSelected[1].checked){
ans = (valueOne-valueTwo);
}
if(functionSelected[2].checked){
ans = (valueOne*valueTwo);
}
if(functionSelected[3].checked){
ans = (valueOne/valueTwo);
}
if(ans>=9007199254740992){
document.getElementById("solution").textContent = "ERROR NUMBER TO LARGE TO BE COMPUTED";
}
else{
document.getElementById("solution").textContent = "Equals: " + ans;
}
}
document.getElementById("fielda").addEventListener("change", compute(), false);
document.getElementById("fieldb").addEventListener("change", compute(), false);
document.getElementByName("function").onclick = compute();
</script>
</head>
<body>
<p>
<input type="number" id="fielda"/><br />
<input type="number" id="fieldb"/><br />
<label><input name="function" type="radio" value="add"/> Add</label><br />
<label><input name="function" type="radio" value="subtract"/> Subtract</label><br />
<label><input name="function" type="radio" value="multiply"/> Multiply</label><br />
<label><input name="function" type="radio" value="divide"/> Divide</label><br />
</p>
<p>
<output id="solution">Solution Will Appear Here</output>
</p>
</body>
You can use
<select ... onchange="javascript:compute();">
There are a lot of events that you can use in response to different events depending on the control.
They are named onmouseover, onclick, onchange, etc. and you can assign a javascript function to each one if you want.
Another alternative is to use you following syntax:
document.getElementById("id_of_select_control").onchange = function() {
// your code here
}
Or if you use jQuery in your project, something like this:
$("#id_of_select_control").change(function() {
// your code here
});
I am basing my question and example on Jason's answer in this question
I am trying to avoid using an eventListener, and just to call handleClick onsubmit, when the submit button is clicked.
Absolutely nothing happens with the code I have.
Why is handleClick not being called?
<html>
<head>
<script type="text/javascript">
function getRadioButtonValue(rbutton)
{
for (var i = 0; i < rbutton.length; ++i)
{
if (rbutton[i].checked)
return rbutton[i].value;
}
return null;
}
function handleClick(event)
{
alert("Favorite weird creature: "+getRadioButtonValue(this["whichThing"]));
event.preventDefault(); // disable normal form submit behavior
return false; // prevent further bubbling of event
}
</script>
</head>
<body>
<form name="myform" onSubmit="JavaScript:handleClick()">
<input name="Submit" type="submit" value="Update" onClick="JavaScript:handleClick()"/>
Which of the following do you like best?
<p><input type="radio" name="whichThing" value="slithy toves" />Slithy toves</p>
<p><input type="radio" name="whichThing" value="borogoves" />Borogoves</p>
<p><input type="radio" name="whichThing" value="mome raths" />Mome raths</p>
</form>
</body>
</html>
edit:
Please do not suggest a framework as a solution.
Here are the relevant changes I have made to the code, which results in the same behavior.
function handleClick()
{
alert("Favorite weird creature: "+getRadioButtonValue(document.myform['whichThing'])));
event.preventDefault(); // disable normal form submit behavior
return false; // prevent further bubbling of event
}
</script>
</head>
<body>
<form name="aye">;
<input name="Submit" type="submit" value="Update" action="JavaScript:handleClick()"/>
Which of the following do you like best?
<p><input type="radio" name="whichThing" value="slithy toves" />Slithy toves</p>
<p><input type="radio" name="whichThing" value="borogoves" />Borogoves</p>
<p><input type="radio" name="whichThing" value="mome raths" />Mome raths</p>
</form>
You can either use javascript url form with
<form action="javascript:handleClick()">
Or use onSubmit event handler
<form onSubmit="return handleClick()">
In the later form, if you return false from the handleClick it will prevent the normal submision procedure. Return true if you want the browser to follow normal submision procedure.
Your onSubmit event handler in the button also fails because of the Javascript: part
EDIT:
I just tried this code and it works:
<html>
<head>
<script type="text/javascript">
function handleIt() {
alert("hello");
}
</script>
</head>
<body>
<form name="myform" action="javascript:handleIt()">
<input name="Submit" type="submit" value="Update"/>
</form>
</body>
</html>
In this bit of code:
getRadioButtonValue(this["whichThing"]))
you're not actually getting a reference to anything. Therefore, your radiobutton in the getradiobuttonvalue function is undefined and throwing an error.
EDIT
To get the value out of the radio buttons, grab the JQuery library, and then use this:
$('input[name=whichThing]:checked').val()
Edit 2
Due to the desire to reinvent the wheel, here's non-Jquery code:
var t = '';
for (i=0; i<document.myform.whichThing.length; i++) {
if (document.myform.whichThing[i].checked==true) {
t = t + document.myform.whichThing[i].value;
}
}
or, basically, modify the original line of code to read thusly:
getRadioButtonValue(document.myform.whichThing))
Edit 3
Here's your homework:
function handleClick() {
alert("Favorite weird creature: " + getRadioButtonValue(document.aye.whichThing));
//event.preventDefault(); // disable normal form submit behavior
return false; // prevent further bubbling of event
}
</script>
</head>
<body>
<form name="aye" onSubmit="return handleClick()">
<input name="Submit" type="submit" value="Update" />
Which of the following do you like best?
<p><input type="radio" name="whichThing" value="slithy toves" />Slithy toves</p>
<p><input type="radio" name="whichThing" value="borogoves" />Borogoves</p>
<p><input type="radio" name="whichThing" value="mome raths" />Mome raths</p>
</form>
Notice the following, I've moved the function call to the Form's "onSubmit" event. An alternative would be to change your SUBMIT button to a standard button, and put it in the OnClick event for the button. I also removed the unneeded "JavaScript" in front of the function name, and added an explicit RETURN on the value coming out of the function.
In the function itself, I modified the how the form was being accessed. The structure is:
document.[THE FORM NAME].[THE CONTROL NAME] to get at things. Since you renamed your from aye, you had to change the document.myform. to document.aye. Additionally, the document.aye["whichThing"] is just wrong in this context, as it needed to be document.aye.whichThing.
The final bit, was I commented out the event.preventDefault();. that line was not needed for this sample.
EDIT 4 Just to be clear. document.aye["whichThing"] will provide you direct access to the selected value, but document.aye.whichThing gets you access to the collection of radio buttons which you then need to check. Since you're using the "getRadioButtonValue(object)" function to iterate through the collection, you need to use document.aye.whichThing.
See the difference in this method:
function handleClick() {
alert("Direct Access: " + document.aye["whichThing"]);
alert("Favorite weird creature: " + getRadioButtonValue(document.aye.whichThing));
return false; // prevent further bubbling of event
}
Pretty example by Miquel (#32) should be refilled:
<html>
<head>
<script type="text/javascript">
function handleIt(txt) { // txt == content of form input
alert("Entered value: " + txt);
}
</script>
</head>
<body>
<!-- javascript function in form action must have a parameter. This
parameter contains a value of named input -->
<form name="myform" action="javascript:handleIt(lastname.value)">
<input type="text" name="lastname" id="lastname" maxlength="40">
<input name="Submit" type="submit" value="Update"/>
</form>
</body>
</html>
And the form should have:
<form name="myform" action="javascript:handleIt(lastname.value)">
There are a few things to change in your edited version:
You've taken the suggestion of using document.myform['whichThing'] a bit too literally. Your form is named "aye", so the code to access the whichThing radio buttons should use that name: `document.aye['whichThing'].
There's no such thing as an action attribute for the <input> tag. Use onclick instead: <input name="Submit" type="submit" value="Update" onclick="handleClick();return false"/>
Obtaining and cancelling an Event object in a browser is a very involved process. It varies a lot by browser type and version. IE and Firefox handle these things very differently, so a simple event.preventDefault() won't work... in fact, the event variable probably won't even be defined because this is an onclick handler from a tag. This is why Stephen above is trying so hard to suggest a framework. I realize you want to know the mechanics, and I recommend google for that. In this case, as a simple workaround, use return false in the onclick tag as in number 2 above (or return false from the function as stephen suggested).
Because of #3, get rid of everything not the alert statement in your handler.
The code should now look like:
function handleClick()
{
alert("Favorite weird creature: "+getRadioButtonValue(document.aye['whichThing']));
}
</script>
</head>
<body>
<form name="aye">
<input name="Submit" type="submit" value="Update" onclick="handleClick();return false"/>
Which of the following do you like best?
<p><input type="radio" name="whichThing" value="slithy toves" />Slithy toves</p>
<p><input type="radio" name="whichThing" value="borogoves" />Borogoves</p>
<p><input type="radio" name="whichThing" value="mome raths" />Mome raths</p>
</form>
Everything seems to be perfect in your code except the fact that handleClick() isn't working because this function lacks a parameter in its function call invocation(but the function definition within has an argument which makes a function mismatch to occur).
The following is a sample working code for calculating all semester's total marks and corresponding grade. It demonstrates the use of a JavaScript function(call) within a html file and also solves the problem you are facing.
<!DOCTYPE html>
<html>
<head>
<title> Semester Results </title>
</head>
<body>
<h1> Semester Marks </h1> <br>
<script type = "text/javascript">
function checkMarks(total)
{
document.write("<h1> Final Result !!! </h1><br>");
document.write("Total Marks = " + total + "<br><br>");
var avg = total / 6.0;
document.write("CGPA = " + (avg / 10.0).toFixed(2) + "<br><br>");
if(avg >= 90)
document.write("Grade = A");
else if(avg >= 80)
document.write("Grade = B");
else if(avg >= 70)
document.write("Grade = C");
else if(avg >= 60)
document.write("Grade = D");
else if(avg >= 50)
document.write("Grade = Pass");
else
document.write("Grade = Fail");
}
</script>
<form name = "myform" action = "javascript:checkMarks(Number(s1.value) + Number(s2.value) + Number(s3.value) + Number(s4.value) + Number(s5.value) + Number(s6.value))"/>
Semester 1: <input type = "text" id = "s1"/> <br><br>
Semester 2: <input type = "text" id = "s2"/> <br><br>
Semester 3: <input type = "text" id = "s3"/> <br><br>
Semester 4: <input type = "text" id = "s4"/> <br><br>
Semester 5: <input type = "text" id = "s5"/> <br><br>
Semester 6: <input type = "text" id = "s6"/> <br><br><br>
<input type = "submit" value = "Submit"/>
</form>
</body>
</html>
Remove javascript: from onclick=".., onsubmit=".. declarations
javascript: prefix is used only in href="" or similar attributes (not events related)