I am trying to assign values to div by a global array (in ascending function) . but the array is always empty in ascending function. Please also mention the best practice in this case.
I wish to set an array in one function , and in the other function I wish to use the same populated array . but after entering all the values I found that page get refresh and the values assign to array and Hidden1 field are set to empty again.
<html>
<head>
<script type="text/javascript">
var array = new Array();
function get_strings(m)
{
i = 1;
do
{
var ArrayElement=prompt("Please Enter a Number");
i++;
array.push(ArrayElement);
}
while (i <= m);
document.getElementById('print').InnerHtml = array;
document.getElementById('Hidden1').value = array;
};
</script>
<script>
function ascending()
{
var x = document.getElementById('Hidden1').value;
document.getElementById('print').InnerHtml = x;
};
</script>
</head>
<body>
<h2>Enter Number of elements</h2>
<br /><br />
<form>
<input id="Hidden1" type="hidden" value="" />
<input id="num" type="text" name="elements"> <br> <input type="submit" value="Submit" text= "Take Input" onclick="get_strings(document.getElementById('num').value)">
<br />
<input type="submit" value="Ascending" text= "Ascending" onclick="ascending()">
</form>
<div id="print"></div>
</body>
</html>
Page got refreshed because you are clicking the submit button, it's just the basic desired behavior when clicking on a submit button. Which brings the question, do you intend to submit this value to the backend? If so what you need to do is to have your backend return the value after the form POST.
If you do not intend on submitting this value, then use a regular button instead of a submit button.
Related
it does not returns prpoer answer it returnes NAN in Answer
<html>
<head>
<script type="text/javascript">
function pro(n,p)
{
var number=parseInt(n);
var powe=parseInt(p);
for(var i=1;i<powe;i++)
{
number*=number;
}
document.getElementById("answer").value=number;
}
</script>
</head>
<body>
<form name="F" >
Enter Number <input type="text" name="num" id="num"/>
Enter Power <select name="powe" id="powe">
<option value="2" >square</option>
<option value="3" >cube</option>
</select>
Answer<input type="text" name="Answer" id="answer" />
<input type="button" onClick="pro(num,powe)" value="Calculate" />
</form>
</body>
</html>
The issue is this: onClick="pro(num,powe)". Instead of the values for num and powe being gotten from the input elements and passed into the pro function, the actual element references (which are not numbers) are being passed.
To solve this problem, you'll need to get the values of the elements. But, before you just make a quick edit to your code, don't use inline HTML event attributes (onclick) in the first place. Instead, separate your JavaScript from your HTML and set up event handlers using modern standards with .addEventListener() as shown below.
Also (FYI):
Since you aren't actually submitting form data anywhere, you don't
need a <form> element.
It's not necessary to use parseInt with p.value because that
value is coming from your select and you've already set those at
whole numbers.
Don't bother with self-terminating tags (<input />) as you
gain nothing from using them.
If you are expecting only numeric input, it's better to use input
type=number which restricts the user input to numbers. Making this change also saves you from worrying about parseInt on the input number being misinterpreted as other bases than 10.
Since you don't want the user to be able to change the result of the
operation, it's better to display it in a non-editable element, like
a span.
It's a good idea to move your <script> element to just before the
closing body tag because, by the time the parser reaches that
point, all your HTML elements will have been parsed into memory.
<html>
<head>
</head>
<body>
<div>
Enter Number <input type="number" name="num" id="num">
</div>
<div>
Enter Power
<select name="powe" id="powe">
<option value="2">square</option>
<option value="3">cube</option>
</select>
</div>
<div>
Answer <span id="answer"></span>
</div>
<div>
<input type="button" value="Calculate">
</div>
<script>
// Get references to the inputs, the answer container and the button
let inputNum = document.getElementById("num");
let power = document.getElementById("powe");
let answer = document.getElementById("answer");
let btn = document.querySelector("input[type='button']");
// Set up the click event handler for the button
btn.addEventListener("click", function(){
// Now you need to get the input values and pass them
// to the function that will act with them
pro(inputNum.value, power.value);
});
function pro(n,p) {
var number = parseInt(n);
for(var i = 1; i < p; i++) {
number *= number;
}
answer.textContent = number;
}
</script>
</body>
</html>
Try
document.getElementById("answer").innerHTML = number
I would like to copy the value from an input in one form to the value of an input(with the same name) of the next form down. The forms and inputs are named the same. All it needs to do is copy the value of the title input to the title input one form down.
<form>
<input name="file" value="1.xml">
<input name="title" id="title" value="Smith">
<input type="submit" id="copy-down" value="copy">
</form>
<form>
<input name="file" value="2.xml">
<input name="title" id="title" value="Anderson">
<input type="submit" id="copy-down" value="copy">
</form>
etc...
In this case when the top "copy" button is clicked I would like jquery to overwrite Anderson with Smith.
$('#title').attr('value'));
Gives me Smith but I'm not sure what to do with that value once I have it.
Change HTML to this:
<form>
<input name="file" value="1.xml">
<input name="title" id="title1" value="Smith">
<input type="submit" id="copy-down1" value="copy">
</form>
<form>
<input name="file" value="2.xml">
<input name="title" id="title2" value="Anderson">
<input type="submit" id="copy-down2" value="copy">
</form>
Javascript:
function copyHandler() {
var copyVal = document.getElementById("title1").value;
var replaceInput = document.getElementById("title2");
replaceInput.value = copyVal;
}
document.getElementById("copy-down1").onclick = function(){
copyHandler();
return false;
}
Some notes:
This is so straightforward in vanilla javascript that I didn't add the jQuery code.
You should never assign multiple elements to the same ID, class or name can be used for that purpose.
The return false; portion of the onclick function is necessary so that the form doesn't reload when you click your submit button.
Let me know if you have any questions.
you can try
$(document).ready(function(){
$('form').on('submit', function(e){
e.preventDefault();
var GetNameAttr = $(this).find('input:nth-child(2)').attr('name');
var GetTitleValue = $(this).find('input:nth-child(2)').val();
var NextFormNameAttr = $(this).next('form').find('input:nth-child(2)').attr('name');
if(NextFormNameAttr == GetNameAttr){
$(this).next('form').find('input:nth-child(2)').val(GetTitleValue );
}
});
});
Note: this code will change the second input value in next form with
the second input value of form you click if the name is same .. you
can do the same thing with the first input by using :nth-child(1)
Demo here
if your forms dynamically generated use
$('body').on('submit','form', function(e){
instead of
$('form').on('submit', function(e){
for simple use I create a function for that
function changeNextValue(el , i){
var GetNameAttr1 = el.find('input:nth-child('+ i +')').attr('name');
var GetTitleValue1 = el.find('input:nth-child('+ i +')').val();
var NextFormNameAttr1 = el.next('form').find('input:nth-child('+ i +')').attr('name');
if(NextFormNameAttr1 == GetNameAttr1){
el.next('form').find('input:nth-child('+ i +')').val(GetTitleValue1);
}
}
use it like this
changeNextValue($(this) , nth-child of input 1 or 2);
// for first input
changeNextValue($(this) , 1);
// for second input
changeNextValue($(this) , 2);
Working Demo
I am trying to create a page that lets the user enter three numbers, and have the max and min values printed below from the input. I've used both the Math.max/min functions and also tried an if statement but When I click submit nothing shows up. Some insight would be greatly appreciated, thanks!
function max() {
var x = document.getElementById("num1").value;
var y = document.getElementById("num2").value;
var z = document.getElementById("num3").value;
var maximum = Math.max(parseInt(x), parseInt(y), parseInt(z));
document.getElementById("max").innerHTML= maximum;
}
function min() {
var x = parseInt(document.getElementById("num1").value);
var y = parseInt(document.getElementById("num2").value);
var z = parseInt(document.getElementById("num3").value);
document.getElementById("min").innerHTML = Math.min(x,y,z);
}
And here is my html
<p>Enter First Number:</p>
<input type="text" name = "number1" id="num1"><br>
<p>Enter Second Number</p>
<input type="text" name = "number2" id="num2"><br>
<p>Enter third number</p>
<input type="text" name = "number3" id="num3"><br>
<input type="submit" value="Submit" onclick="max(); min(); "><br />
<p>Max =</p><p id ="max"></p><br />
<p>Min =</p><p id ="min"></p><br />
replace <input type="submit"/> to <button type="submit" value="" onclick="minmax();">Submit</button>
and add JS function:
function minmax() {
min();
max();
}
Your problem seems related to how you are attaching your event.
It works OK when I use:
document.querySelector( '[type="submit"]' ).addEventListener( 'click', function() {
max();
min();
}, false );
http://jsfiddle.net/yemxrmqq/
You just need to change the tag related to the button, instead of:
<input type="submit" value="Submit" onclick="max(); min(); "><br />
just put:
<button type="submit" value="Submit" onclick="max(); min()">Click</button><br />
None of the answers here tell you why your code didn't work.
Identifiers in inline listeners are first resolved as properties of the element on which they are placed. Input elements have a default max attribute, so within an inline listener, the identifier max will reference the input's max property. Hence in any document:
<input onclick="console.log(max)">
shows '' (i.e. empty string).
So you can either change the names of the functions to something more meaningful, or change the context from which they are called so that the identifiers aren't resolved on the element, and the OP code works. e.g.
<input type="submit" value="Submit" onclick="callBoth()">
and
function callBoth() {
max();
min();
}
Incidentally, an input type submit outside a form is just a button, so you should use:
<input type="button" ...>
Beginer to javasctipt. I am trying to write a simple calculation that will display some text if the time since oil change is past 6 months, the amount of oil left in the car is less then it started and finally display if everything is ok.
Thanks for the help
JavaScript
function oil(){
var start = document.oil.start.value;
var lastOilChange = document.oil.time.value;
var totalOil = document.oil.amount.value;
var aa = "you need to change the oil";
if( lastOilChange > 6 || start < totalOil){
document.oil.result.write(aa);
}else{
document.oil.result.write("Everything Is all good");
}
}
HTML
<form name="oil">
Starting amount of oil
<input type="text" name="start">
Time since oil change
<input type="text" name="time">
Total amount of oil in car now(quarts)
<input type="text" name="amount">
<input type="submit" onclick = oil()>
<input name=result readonly>
</form>
There are a couple of problems with your code
Missing Form close tag
Your controls don't have IDs
missing quotes on the result input
Don't need to use a submit input when you're not submitting to a form. Try button
Not sure what document.oil.result.write(aa); will do. I think the correct process is to get the input using document.getElementById and then set the value of the control
I will try to answer your question with the least number of line changes. This is not the optimal answer. Comments have been added to help you understand required changes. Your HTML and JavaScript are invalid, so it was a surprise to me how they both ran on Chrome.
<!doctype>
<html>
<head>
<title>Personal</title>
<meta charset="utf-8">
<script type="text/javascript">
function _oil(){ // oil() conflicts with your form's name
var start = document.oil.start.value;
var lastOilChange = document.oil.time.value;
var totalOil = document.oil.amount.value;
var aa = "you need to change the oil";
if( lastOilChange > 6 || start < totalOil){
document.write(aa); // you can't .write() to an element
}else{
document.write("Everything Is all good");
}
window.event.preventDefault(); // so your window does not load the same page when you submit
return false;
}
</script>
<style>
form input {
display: block;
}
</style>
</head>
<body>
<form name="oil">
Starting amount of oil
<input type="text" name="start">
Time since oil change
<input type="text" name="time">
Total amount of oil in car now(quarts)
<input type="text" name="amount">
<input type="submit" onclick ="_oil()"> <!-- you must enclose the onclick attribute, even if both work -->
<input name=result readonly>
</body>
</html>
May be like this:
<!doctype>
<html>
<head>
<title>Personal</title>
<meta charset="utf-8">
<script type="text/javascript">
function oil(){
var start = document.getElementsByName("start")[0].value;
var lastOilChange = document.getElementsByName("time")[0].value;
var totalOil = document.getElementsByName("amount")[0].value;
var aa = "you need to change the oil";
if( lastOilChange > 6 || start < totalOil){
document.getElementsByName("result")[0].value = aa;
}else{
document.getElementsByName("result")[0].value = "Everything Is all good";
}
}
</script>
<style>
form input {
display: block;
}
</style>
</head>
<body>
<form name="thisform">
Starting amount of oil
<input type="text" name="start">
Time since oil change
<input type="text" name="time">
Total amount of oil in car now(quarts)
<input type="text" name="amount">
<input type="button" value="go" onclick = oil()>
<input name=result readonly>
</form>
</body>
</html>
！！！ The form name can not use oil
What you want is to set the value of the form field rather than trying to use write:
if( lastOilChange > 6 || start < totalOil){
document.oil.result.value = aa;
} else {
document.oil.result.value = "Everything Is all good";
}
As pointed out in other answers, though, you also need to prevent the form from trying to submit information to the server and reload the page. There are several ways of doing this (see e.g. JavaScript code to stop form submission). One is to replace the submit button with an ordinary button (<input type="button" value="Calculate" />).
Another is to attach your function to the form as an event handler, and return false at the end of it.
document.oil.onsubmit = function () {
...
return false;
}
(JSFiddle)
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)