I want to assign a value to hidden input then grab that value from next section of javascript using input id. So it will alert the value as per hidden input value which assigned from the first section of javascript. However, it looks not useful this is important for my current task. I have to push value to HTML then get it back again in javascript variable. Let me know if you have any solution.
<!DOCTYPE html>
<html>
<head>
<title>Just test</title>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jszip/2.5.0/jszip.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/pdfmake/0.1.18/pdfmake.min.js"></script>
</head>
<body>
<script>
var myVal = "some string";
$("#foo").val(myVal);
</script>
<input type="hidden" name="foo" id="foo" value="">
<script>
var doo = "";
doo = $(this).find("#foo").val();
if (doo != "") {
alert(doo);
}else{
alert("doo is null");
}
</script>
</body>
</html>
You can use $(document).ready() method which waits until all DOM elements are rendered. Then executes the JS code. You can read more about it here
<!DOCTYPE html>
<html>
<head>
<title>Just test</title>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jszip/2.5.0/jszip.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/pdfmake/0.1.18/pdfmake.min.js"></script>
</head>
<body>
<script>
$(document).ready(function(){
var myVal = "some string";
$("#foo").val(myVal);
});
</script>
<input type="hidden" name="foo" id="foo" value="">
<script>
$(document).ready(function(){
var doo = "";
doo = $(this).find("#foo").val();
if (doo != "") {
alert(doo);
}else{
alert("doo is null");
}
});
</script>
</body>
</html>
Using HTMLFormControlsCollection of the Web API allows us to reference any and all form elements very easily:
Example
/* Find the first form of a page without knowing it's .class or #id */
// HTMLFormControlsCollection // Common way
var form = document.forms[0]; var form = document.getElementsByTagName('form')[0];
Demo
<!DOCTYPE html>
<html>
<head>
<title>Just test</title>
</head>
<body>
<form id='A'>
<input id="X" name="X">
<output id='Y' name='Y'></output>
<input id='Z' name='Z' type='hidden'>
</form>
<script>
var F = document.forms.A;
F.oninput = function() {
var X = F.X.value;
var Y = F.Y;
var Z = F.Z;
Y.value = X;
Z.value = X;
}
</script>
</body>
</html>
Related
The library I am using: https://github.com/icambron/moment-countdown
My code:
<!DOCTYPE html>
<html>
<head>
<title>Test</title>
<!-- https://github.com/icambron/moment-countdown -->
<script src="moment.min.js"></script>
<script src="countdown.min.js"></script>
<script src="moment-countdown.min.js"></script>
</head>
<body>
<input type="datetime-local" id="timeInputHTML" onchange="mainfunc()>
<p id="pel"></p>
<script>
function mainfunc() {
timeVar = document.getElementById("timeInputHTML").value;
// var timeInputVar = moment("2045-01-01 00:00:00").countdown().toString();
var timeInputVar = moment(timeVar).countdown().toString();
document.getElementById("pel").innerHTML = timeInputVar;
}
// Run above function every 1 second
setInterval(mainfunc, 1000);
</script>
</body>
</html>
The question: How do I make the variable timeVar when it obtains its values from timeInputHTML in the HTML code, not contain contain a T in the middle like so: "2018-05-05T14:30" I believe this is what is wrong with my code and is causing the Uncaught TypeError if it is not the issue then please can you explain to me what is please?
The image / screenshot:
<!DOCTYPE html>
<html>
<head>
<title>Test</title>
<!-- https://github.com/icambron/moment-countdown -->
<script src="moment.min.js"></script>
<script src="countdown.min.js"></script>
<script src="moment-countdown.min.js"></script>
</head>
<body>
<input type="datetime-local" id="timeInputHTML" onchange="mainfunc()">
<p id="pel"></p>
<script>
function mainfunc() {
timeVar = document.getElementById("timeInputHTML").value;
// var timeInputVar = moment("2045-01-01 00:00:00").countdown().toString();
var timeInputVar = moment(timeVar).countdown().toString();
document.getElementById("pel").innerHTML = timeInputVar;
}
// Run above function every 1 second
setInterval(mainfunc, 1000);
</script>
</body>
</html>
your are missing " this in input function it should be like this
<input type="datetime-local" id="timeInputHTML" onchange="mainfunc()">
I am using a $.getJSON method to retrieve weather data from open weather. When i use an explicit URL string for the document ready function, I am able to retrieve the values from the response JSON and write them to the page.
This works fine.
I am attempting to create a basic user input to query the data by zip code. I've created a nested function with the API URL as a concatenated string. I am unable to determine why the code in the nested function submitZip is not writing the response to the page in the same way that the document ready function did.
I have tried debugging and it appears that the string is concatenating correctly and making the API call successfully, but for some reason I am unable retrieve data from the response. Any ideas on I may have incorrect here?
var place = document.getElementById("meat");
var header = document.getElementById("header");
$(document).ready(function () {
$.getJSON("http://api.openweathermap.org/data/2.5/weather?zip=36830&APPID=75ed54453a6e806917cfa439b3fb1dd9&units=imperial", function (data) {
place.innerText = data.main.temp;
});
});
var weather = document.getElementById("Weather");
function submitZip() {
var zipCode = document.getElementById("Zip-Code");
var fullURL = "http://api.openweathermap.org/data/2.5/weather?zip=" + zipCode.value + "&APPID=75ed54453a6e806917cfa439b3fb1dd9&units=imperial";
$.getJSON(fullURL, function (data) {
//var currentTemp = api.main.temp;
weather.innertText = data.main.temp;
});
return weather;
};
var submitButton = document.getElementById("submit-zip");
submitButton.addEventListener('click', submitZip, false);
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8" />
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<link rel="stylesheet" type="text/css" href="css/style.css" />
<title>Weather</title>
</head>
<body>
<h2 id="header">This page will be utilitzed as practice for API</h2>
<p id="meat"></p>
<form>
<p>Enter the Zip Code to see the Weather there!</p>
<input id = "Zip-Code" type="text"/>
<input id = "submit-zip" type="submit"/>
</form>
<div>
<p id= "Weather"></p>
</div>
</body>
</html>
<script src="javascript/main.js"></script>
</body>
</html>
Your page gets reloaded as soon as you press the submit button.
Change the type of the button to button or
prevent the default behaviour using event.prevenDefault()
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8" />
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<link rel="stylesheet" type="text/css" href="css/style.css" />
<title>Weather</title>
</head>
<body>
<h2 id="header">This page will be utilitzed as practice for API</h2>
<p id="meat"></p>
<form>
<p>Enter the Zip Code to see the Weather there!</p>
<input id = "Zip-Code" type="text"/>
<input id = "submit-zip" type="submit"/>
</form>
<div>
<p id= "Weather"></p>
</div>
</body>
</html>
<script src="javascript/main.js"></script>
</body>
</html>
var place = document.getElementById("meat");
var header = document.getElementById("header");
$(document).ready(function () {
$.getJSON("http://api.openweathermap.org/data/2.5/weather?zip=36830&APPID=75ed54453a6e806917cfa439b3fb1dd9&units=imperial", function (data) {
place.innerText = data.main.temp;
});
});
var weather = document.getElementById("Weather");
function submitZip(e) {
e.preventDefault();
var zipCode = document.getElementById("Zip-Code");
var fullURL = "http://api.openweathermap.org/data/2.5/weather?zip=" + zipCode.value + "&APPID=75ed54453a6e806917cfa439b3fb1dd9&units=imperial";
$.getJSON(fullURL, function (data) {
//var currentTemp = api.main.temp;
weather.innertText = data.main.temp;
});
return weather;
};
var submitButton = document.getElementById("submit-zip");
submitButton.addEventListener('click', submitZip, false);
Two issues:
The form is submitted (and reloads) when you click the button. Avoid this by calling e.preventDefault() on the event object.
You have a spelling mistake in weather.innertText. Remove the extra t in the middle
Working code:
var place = document.getElementById("meat");
var header = document.getElementById("header");
$(document).ready(function () {
$.getJSON("http://api.openweathermap.org/data/2.5/weather?zip=36830&APPID=75ed54453a6e806917cfa439b3fb1dd9&units=imperial", function (data) {
place.innerText = data.main.temp;
});
});
var weather = document.getElementById("Weather");
function submitZip(e) {
var zipCode = document.getElementById("Zip-Code");
var fullURL = "http://api.openweathermap.org/data/2.5/weather?zip=" + zipCode.value + "&APPID=75ed54453a6e806917cfa439b3fb1dd9&units=imperial";
$.getJSON(fullURL, function (data) {
//var currentTemp = api.main.temp;
weather.innerText = data.main.temp;
});
e.preventDefault();
};
var submitButton = document.getElementById("submit-zip");
submitButton.addEventListener('click', submitZip, false);
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8" />
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<link rel="stylesheet" type="text/css" href="css/style.css" />
<title>Weather</title>
</head>
<body>
<h2 id="header">This page will be utilitzed as practice for API</h2>
<p id="meat"></p>
<form>
<p>Enter the Zip Code to see the Weather there!</p>
<input id = "Zip-Code" type="text"/>
<input id = "submit-zip" type="submit"/>
</form>
<div>
<p id= "Weather"></p>
</div>
</body>
</html>
<script src="javascript/main.js"></script>
</body>
</html>
first.html
<!DOCTYPE html>
<html>
</head>
<body>
<form>
<script type="text/javascript">
// grab the id number
var theIdNumber = localStorage.getItem("idNumber");
// set the ID in the HTML page
document.getElementById("userId").value = theIdNumber;
</script>
<button type="button" onClick="validateUsernamePassword()">SEND</button>
</form>
</body>
</html>
other.js
function validateUsernamePassword()
{
var idNum = $("#userId").val();
alert('Well the id is :' + idNum);
// more code
}
The alert doesn't print the passed ID ... why ?
Modify your html like this:
<html>
<head>
<title></title>
</head>
<body>
<form>
<button type="button" onClick="validateUsernamePassword()">SEND</button>
<input type="hidden" id="userId"></input>
</form>
<script type="text/javascript">
// grab the id number
var theIdNumber = localStorage.getItem("idNumber");
// set the ID in the HTML page
document.getElementById("userId").value = theIdNumber;
</script>
</body>
</html>
Or you could do just this:
function validateUsernamePassword()
{
var idNum = localStorage.getItem("idNumber");
alert('Well the id is :' + idNum);
// more code
}
The second one is good since you already have the item in localstorage, so ther is no need of assign its value to another element
this trick may help you:
<html>
<head>
</head>
<body>
<dl>
<script>
window.var1 = "hello, world";
</script>
<input type="button" value="click" onclick="clicked()">
<script>
function clicked(){
alert(window.var1);
};
</script>
</body>
<body>
<script type="text/javascript">
var a="sreedhar";
<input type="text" value="abc">
</script>
</body>
It gives the syntax error.
can't we use "html tags" directly in "javascript".
No, you can't use them directly in JavaScript.
However you may treat them as strings:
var str = '<input type="text" value="abc">';
or as DOM elements:
var input = document.createElement('input');
input.type = 'text';
input.value = 'abc';
And then append to the markup, e.g. document.body.appendChild(input);.
Usually a well formated hmtl with javascript looks like this.
<HTML>
<HEAD>
<script type="text/javascript">
var a="sreedhar";
</script>
</HEAD>
<BODY>
<input type="text" value="abc">
</BODY>
</HTML>
If you want to generate some html with javascript then assign it as a string to some variable.
For example you have a div having id='abc' and you want to generate a textbox in this div then you need to do like this
<script type="text/javascript">
var textbox = '<input type="text" value="abc">';
$('#abc').append(textbox);
</script>
Maybe you want this:
<script type="text/javascript">
var a="sreedhar";
document.write('<input type="text" value="abc">');
</script>
</BODY>
<html>
<head>
<title> New Document </title>
<script type="text/javascript">
//put javascript function here
</script>
</head>
<body>
<input type="text" value="abc">
</body>
</html>
You can use html element inside the javascript using element id.
I have the follwing code. I want to get the value of the selected value of the dropdownlist once the user changes it or to have the default value to be displayed by alert(). I need to use alert() from within the < body > of the html. Is that possible?
<html>
<head>
<title>Title</title>
<script type="text/javascript" src="phonegap-1.4.1.js">
</script> <script type="text/javascript" src="JS/Util.js"></script>
<script type="text/javascript" src="JS/Language.js"></script>
<script type="text/javascript">
function dropdown(){
var drp = document.getElementById("numberlist");
var optn = document.createElement("OPTION");
optn.text="3";
optn.value="3";
drp.add(optn);
}
</script>
</head>
<body onload="dropdown();"> <div id="main3"></div> <form><select id = "numberlist"><option>12</option><option>24</option><option>36</option></select>
Use the code:
selectElement.options[ selectElement.options.selectedIndex ];
to find the index that is selected.
So where you say var drp = document.getElementById("numberlist"); you can now find the value of the index by doing:
var value = drp.options[ drp.options.selectedIndex ].value;
Add the code into an onchange event so that whenever you change the selectedIndex of the element, you will be able to obtain it's value:
Here is a DEMO
Try this Following...Mark it as answer if it helps you
<html>
<head>
<title>Title</title>
<script type="text/javascript" src="phonegap-1.4.1.js"> </script> <script type="text/javascript" src="JS/Util.js"></script>
<script type="text/javascript" src="JS/Language.js"></script>
<script type="text/javascript">
function dropdown()
{
var drp = document.getElementById("numberlist");
var optn = document.createElement("OPTION");
optn.text="3";
optn.value="3";
drp.add(optn);
}
</script>
</head>
<body onload="dropdown();">
<div id="main3">
</div>
<form>
<select id="numberlist" onchange="show()">
<option>12</option>
<option>24</option>
<option>36</option>
</select>
<script type="text/javascript">
function show() {
var e = document.getElementById('numberlist');
var txt = e.options[e.selectedIndex].text;
alert(txt);
}
</script>
</form>
</body>
</html>
add this function within script tag.
function pickvalue(id){
var drp = document.getElementById(id);
alert(drp.value);
}
and add function call like this.
<select id = "numberlist" onchange="pickvalue(this.id)">
Here is a JQuery method:
$value = $("#numberlist option:selected").text();
alert($value);