Trying to read JSON from hidden input value.
<html>
<body>
<input id="hdn" type="hidden" value='{"products":{"id":100001,name:"Ram"}}'>
<script type="text/javascript">
var jsonObj = document.getElementById('hdn').value;
alert(jsonObj);
alert(jsonObj.products.name);
</script>
</body>
</html>
You need to parse it as var jsonObj = JSON.parse(document.getElementById('hdn').value)
Note, I changed the way you were storing your JSON object, by adding the quotes to the name property. I added as both console.log and an alert... mostly because I prefer console.log, but you originally had an alert in there.
Here's the updated (working) code:
<html>
<body>
<input id="hdn" type="hidden" value='{"products":{"id":100001,"name":"Ram"}}'>
<script type="text/javascript">
var jsonObj = JSON.parse(document.getElementById('hdn').value);
console.log(jsonObj);
console.log(jsonObj.products.name);
alert(jsonObj);
alert(jsonObj.products.name);
</script>
</body>
</html>
Related
I have 2 php pages
home.php
about.php
I have 1 Javascript page, which I called javascript from home.php.
I want to access the value of the p tag in about.php.
home.php
<!DOCTYPE html>
<html>
<body>
<input type="submit" onclick='myfunction()'>
</body>
</html>
javascript
<script>
function myfunction()
{
}
</script>
about.php
<!DOCTYPE html>
<html>
<head lang="en">
</head>
<body>
<p id='demo'>i want to access this value in javascript function</p>.
</body>
</html>
You probably want something in pure javascript like:
<script>
document.getElementById('demo').innerHTML='change the p tag value';
</script>
function myfunction(){
var val= document.getElementById('demo').textContent;
alert(val);
}
FIDDLE
var pTag = document.getElementById('demo').innerHTML;
The variable pTag will now hold the value(text) of your "demo" tag,
ready for you to do what you wish with it.
EDIT:
Using Javascript, set the value of a hidden form field when you change the contents of your tag.
Then pass the values using php, like below...
home.php:
<form action="about.php">
<input type="hidden" name="demo" id="demo" />
<p id="pDemo"> </p>
<button type="submit"></button>
</form>
Then in about.php:
<p id='demo'>
<?php
$demo= $_GET['demo'];
//use your variable "demo'
?>
</p>
This link should help, here.
You can use ajax or you can use load of jquery.
<script>
$(document).ready(function() {
$("#bAdd").load("about.php",function(response,status,xhr){// use if less data to load
var pTag = document.getElementById('demo').innerHTML;
alert(pTag);
});
});
</script>
<input type="hidden" id="bAdd" value="">
I am working on a simple page that contains 2 iframes. Text is input into iframeA and once a button is clicked on iframeB I want it to display the text from iframeA but it just displays undefined. I feel like I am close but cannot seem to see what I am doing wrong. The code for both iframe pages is below.
--iframeA (ifr1.htm)
<html>
<head>
<script type="text/javascript">
var var_name = document.getElementById("textbox").value;
</script>
<body>
<input type="text" name"textbox" id="textbox"/>
</body>
</html>
--iframeB (ifr2.htm)
<html>
<body>
<script type="text/javascript">
function f2(txt){
var name2 = parent.ifr1.var_name;
document.getElementById('div2').innerHTML = name2;
}
</script>
<div id="div2"></div>
<button onclick="f2('complete')"></button>
</body>
</html>
parent.ifr1.var_name;
I would recommend parent.frames.ifr1.var_name
it just displays undefined:
var var_name = document.getElementById("textbox").value;</script>
</script>
…
<input type="text" name"textbox" id="textbox"/>
You're assigning the value of the input only once, when the document is loading (I doubt that it works at all actually). When you later type anything in, the value of var_name never changes.
Instead, you want to get the value when the button is clicked:
function f2(txt){
var name2 = parent.frames.ifr1.document.getElementById("textbox").value;
document.getElementById('div2').innerHTML = name2;
}
(and you can remove the script from ifr1.htm). Alternatively, use this for the first iframe:
<html>
<head>
<body>
<input type="text" name"textbox" id="textbox"/>
<script type="text/javascript">
var var_name;
document.getElementById("textbox").onchange = function(e) {
var_name = this.value;
};
</script>
</body>
</html>
<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.
<head>
<script type="javascript">
function display()
{
document.getElementById("textField1").value = "abc";
}
</script>
</head>
<body>
<form id="form1" action="http://google.com">
<input id="textField1" type="text" value="0" align="right" size="13"/><br>
<input id="button1" type="button" value="1" onclick="display()">
</form>
</body>
but the value of textfield is not changing.
Any Ideas what am i doing wrong ??
try
<script type="text/javascript">
instead of
<script type="javascript">
. I believe the latter is not a valid syntax.
Removing the type attribute entirely works as well:
<script>
Your line
document.getElementById("textField1").value = "abc";
is correct, try
<head>
<script>
function display() {
document.getElementById("textField1").value = "abc";
}
</script>
</head>
<body>
<form id="form1" action="http://google.com">
<input id="textField1" type="text" size="13" value="clear" /><br>
<input type="button" onclick="display()">
</form>
</body>
Remove the type from your script tag. It's incorrect and making the browser not treat the script contents as JavaScript. Here it is not working, and here it is working (with the type="javascript" removed).
It has to be
<script type="text/javascript">
function display()
{
document.getElementById("textField1").value = "abc";
}
</script>
and not
<script type="javascript">
function display()
{
document.getElementById("textField1").value = "abc";
}
</script>
In case the text field is not having id attribute and having name attribute then,
use
document.getElementsByName("name")[0].value="ert";
getElementsByName() returns an array of objects with that specific name,that's why we are using the index 0.
There is nothing wrong with your code, it works fine in this fiddle.
I only speculate, but you could try to either delete the type attribute of the script-tag, or change it to type="text/javascript" which would be the proper type to use. If you don't specify it, the browser will consider it as JavaScript by default.
It's actually correct, but if it doesn't work try like this:
document.getElementById("textfield1").innerHtml = "ABC";
<script type="text/javascript">
var p = s.getMaximum();
</script>
<form action="/cgi-bin/Lib.exe" method="POST" name="checks" ID="Form1">
<INPUT TYPE="text" NAME="inputbox" VALUE="VAR P FROM JAVA SCRIPT HERE?" ID="Text1"><P></form>
Possible to pass the javascript value 'p' as the value of input form?
Thanks.
You can use javascript to set the value of that element to p.
<script type="text/javascript">
document.getElementById("Text1").value = p;
</script>
document.getElementById('Text1').value = p;
You want to read about the Javascript DOM.
Start with the following:
http://www.w3schools.com/htmldom/dom_obj_form.asp
Specifically you're looking to manipulate document.checks.inputbox.value
Edit: Page removed. Answer can be found here now:
http://www.w3schools.com/jsref/coll_doc_forms.asp
Using Javascript:
<script type="text/javascript">
document.getElementById("Text1").value = p;
</script>
Using jQuery:
<script type="text/javascript">
$("#Text1").val(p);
</script>