Adding onclick function in anchor tag which is not working
Question
I am have made dropdown using bootstarap. I have added onlcick funtions in my anchor tags in dropdown. I just want make my text box readonly if one of the link is clicked on. I have used js to make text boxes read only. Please Help me to solve my problem. Below is my code:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- Bootstrap CSS -->
<link
href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css"
rel="stylesheet"
integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3"
crossorigin="anonymous">
<title>Mole Calculator | Chemistry Calculator</title>
</head>
<body>
<nav class="navbar fixed-top navbar-expand-lg navbar-dark bg-black">
<div class="container-fluid">
<a class="navbar-brand" href="#"><h4>
<b>Chemistry Calculator</b>
</h4></a>
<button class="navbar-toggler" type="button"
data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent"
aria-controls="navbarSupportedContent" aria-expanded="false"
aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav text-uppercase">
<li class="nav-item"><a class="nav-link active"
aria-current="page" href="/Chemistry-Calculator/">Home</a></li>
<li class="nav-item"><a class="nav-link active"
aria-current="page" href="/Chemistry-Calculator/about">About</a></li>
</ul>
</div>
</div>
</nav>
<div class="container" style="padding-top: 5%;">
<div class="card px-4 py-5" style="width: 650px;">
<div class="card-block">
<form action="/Chemistry-Calculator/Number-Of-Moles">
<div class="mb-3">
<label for="givenMass" class="form-label">Given Mass of
Substance</label> <input type="text" class="form-control" id="givenMass"
aria-describedby="emailHelp" name="givenMass"
value="${givenMass}" style="width: 600px">
</div>
<div class="mb-3">
<label for="molarMass" class="form-label">Molar Mass</label> <input
type="text" class="form-control" id="molarMass" name="molarMass"
value="${molarMass}" style="width: 600px">
</div>
<div class="mb-3">
<label for="molarMass" class="form-label">Moles</label> <input
type="text" class="form-control"
id="molarMass" name="moles" value="${moles}" style="width: 600px">
</div>
<input class="btn btn-outline-success" type="submit"
value="Calculate">
<div class="btn-group">
<button type="button" class="btn btn-success dropdown-toggle"
data-bs-toggle="dropdown" aria-expanded="false">Choose what to calculate </button>
<ul class="dropdown-menu">
<li><a class="dropdown-item" onclick="readonlyForMoles()" href="/Chemistry-Calculator/Mole-Calculator">Calculate Moles</a></li>
<li><a class="dropdown-item" onclick="readonlyForMolarMass()" href="/Chemistry-Calculator/Mole-Calculator">Calculate Molar Mass</a></li>
<li><a class="dropdown-item" onclick="readonlyForGivenMass()" href="/Chemistry-Calculator/Mole-Calculator">Calculate Given mass</a></li>
</ul>
</div>
</form>
</div>
</div>
</div>
<script
src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js"
integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p"
crossorigin="anonymous"></script>
<script type="text/javascript" src="../javascript/script.js"></script>
</body>
</html>
My Java Script File:
function readonlyForGivenMass() {
var x = document.getElementById("givenMass").readOnly;
}
function readonlyForMolarMass() {
var x = document.getElementById("molarMass").readOnly;
}
function readonlyForMoles() {
var x = document.getElementById("moles").readOnly;
}
Actually this is small part of java project. Hence I have used jsp and jstl. My file structure:
2 answers
solution1
0 2022-01-22 07:33:48
<!DOCTYPE html>
<html>
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- Bootstrap CSS -->
<link
href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css"
rel="stylesheet"
integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3"
crossorigin="anonymous">
<title>Mole Calculator | Chemistry Calculator</title>
</head>
<body>
<nav class="navbar fixed-top navbar-expand-lg navbar-dark bg-black">
<div class="container-fluid">
<a class="navbar-brand" href="#"><h4>
<b>Chemistry Calculator</b>
</h4></a>
<button class="navbar-toggler" type="button"
data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent"
aria-controls="navbarSupportedContent" aria-expanded="false"
aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav text-uppercase">
<li class="nav-item"><a class="nav-link active"
aria-current="page" href="/Chemistry-Calculator/">Home</a></li>
<li class="nav-item"><a class="nav-link active"
aria-current="page" href="/Chemistry-Calculator/about">About</a></li>
</ul>
</div>
</div>
</nav>
<div class="container" style="padding-top: 5%;">
<div class="card px-4 py-5" style="width: 650px;">
<div class="card-block">
<form action="/Chemistry-Calculator/Number-Of-Moles">
<div class="mb-3">
<label for="givenMass" class="form-label">Given Mass of
Substance</label> <input type="text" class="form-control" id="givenMass"
aria-describedby="emailHelp" name="givenMass"
value="${givenMass}" style="width: 600px">
</div>
<div class="mb-3">
<label for="molarMass" class="form-label">Molar Mass</label> <input
type="text" class="form-control" id="moles" name="molarMass"
value="${molarMass}" style="width: 600px">
</div>
<div class="mb-3">
<label for="molarMass" class="form-label">Moles</label> <input
type="text" class="form-control"
id="molarMass" name="moles" value="${moles}" style="width: 600px">
</div>
<input class="btn btn-outline-success" type="submit"
value="Calculate">
<div class="btn-group">
<button type="button" class="btn btn-success dropdown-toggle"
data-bs-toggle="dropdown" aria-expanded="false">Choose what to calculate </button>
<ul class="dropdown-menu">
<li><a class="dropdown-item" onclick="readonlyForMoles(event)" href="/Chemistry-Calculator/Mole-Calculator">Calculate Moles</a></li>
<li><a class="dropdown-item" onclick="readonlyForMolarMass(event)" href="/Chemistry-Calculator/Mole-Calculator">Calculate Molar Mass</a></li>
<li><a class="dropdown-item" onclick="readonlyForGivenMass(event)" href="/Chemistry-Calculator/Mole-Calculator">Calculate Given mass</a></li>
</ul>
</div>
</form>
</div>
</div>
</div>
<script
src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js"
integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p"
crossorigin="anonymous"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>
function readonlyForGivenMass(event) {
event.preventDefault()
var x = document.getElementById("givenMass").readOnly= true;
}
function readonlyForMolarMass(event) {
event.preventDefault()
var x = document.getElementById("molarMass").readOnly = true;
}
function readonlyForMoles(event) {
event.preventDefault()
var x = document.getElementById("moles").readOnly = true;
}
</script>
</body>
</html>
if you want means you can remove event.preventDefault in each function and I hope this code will works for you. Thank you
solution2
0 2022-01-22 07:46:41
you are just assigning but declaring it, just need to make it true, so given id would be readonly, please find below snippets
function readonlyForGivenMass() {
document.getElementById("givenMass").readOnly = true;
}
function readonlyForMolarMass() {
document.getElementById("molarMass").readOnly = true;;
}
function readonlyForMoles() {
document.getElementById("moles").readOnly = true;;
}
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