Develop Reference

How To Inset Text Value From iframe to input my page [duplicate]

For say i have a Site called example.com on which iframe is embedded of domain iframe.net, now i want to read the content of iframe and pass some parameter to display a textual message. Like Hi with username.
Now the problem is this able not able to make connection between the two , even am not able to get the innerHTML of iframe i used following approach
document.getElementById('myframe').contentWindow.document.body.innerHTML;
It throws error "Permission denied to access property"
Do anyone know how to read and write in cross domain platform

If you don't have control over the framed site, you cannot circumvent the cross-domain policy.
If you have control over both sites, you can use the postMessage method to transfer data across different domains. A very basic example:
// framed.htm:
window.onmessage = function(event) {
event.source.postMessage(document.body.innerHTML, event.origin);
};
// Main page:
window.onmessage = function(event) {
alert(event.data);
};
// Trigger:
// <iframe id="myframe" src="framed.htm"></iframe>
document.getElementById('myframe').contentWindow.postMessage('','*');

In Internet Explorer 8, events passed as a parameter may be null, that is why you need to access the event in a different manner:
In frame.html:
window.onmessage = function(event) {
var evt = event || window.event;
evt.source.postMessage('Message from iFrame', evt.origin);
};
On main.html:
window.onmessage = function(event) {
var evt = event || window.event;
alert(evt.data);
};
The event is triggered the same way as Rob W has presented:
document.getElementById('frameId').contentWindow.postMessage('message','*');

It can happen only if you have control for both sites
you can use postMessage
here's how you can apply it
first, you can add the below code to the site you want to retrieve data from
<script>
function test() {
document.getElementById('idMyIframe').contentWindow.postMessage("your message here", "*");
}
</script>
<iframe id="idMyIframe" onload="test()" src="http://example.otherdomaintosenddatato.com"></iframe>
the second step you can add this code below to the other domain you want to send a message or the data to it
window.addEventListener("message", function (message) {
if (message.origin == "http://firstdomain.com") {
console.log(message)
}
});
and please note you must add the test() function on the onload attribute of the iframe cause if the function runs before the iframe was loaded it will become useless and it won't send data

Cross Domain iframe elements access in React with (srcDoc):-
<iframe srcDoc={this.state.HTML} width='100%' id='iframetnd' onLoad={this.onclickinsideiframe}/>
onclickinsideiframe=()=>{
if(document.getElementById('iframetnd')!==null){
let iframe = document.getElementById('iframetnd');
let innerDocument = (iframe.contentDocument)
? iframe.contentDocument
: iframe.contentWindow.document;
let Obj = innerDocument.getElementsByClassName("navButtons")[0];
if(Obj !== undefined){
Obj.onclick = ()=>this.func();
}
}
}
func=()=>{
this.setState({page:2})
this.arrangeTest();
}

iFrame does not allow to access contents from Cross Domain platform. You can only access if your iFrame is using the same domain.
This solution works same as iFrame. I have created a PHP script that can get all the contents from the other website, and most important part is you can easily apply your custom jQuery to that external content. Please refer to the following script that can get all the contents from the other website and then you can apply your cusom jQuery/JS as well. This content can be used anywhere, inside any element or any page.
<div id='myframe'>
<?php
/*
Use below function to display final HTML inside this div
*/
//Display Frame
echo displayFrame();
?>
</div>
<?php
/*
Function to display frame from another domain
*/
function displayFrame()
{
$webUrl = 'http://[external-web-domain.com]/';
//Get HTML from the URL
$content = file_get_contents($webUrl);
//Add custom JS to returned HTML content
$customJS = "
<script>
/* Here I am writing a sample jQuery to hide the navigation menu
You can write your own jQuery for this content
*/
//Hide Navigation bar
jQuery(\".navbar.navbar-default\").hide();
</script>";
//Append Custom JS with HTML
$html = $content . $customJS;
//Return customized HTML
return $html;
}

SVG contentDocument null when SVG loads dynamic in Ionic3 [duplicate]

For say i have a Site called example.com on which iframe is embedded of domain iframe.net, now i want to read the content of iframe and pass some parameter to display a textual message. Like Hi with username.
Now the problem is this able not able to make connection between the two , even am not able to get the innerHTML of iframe i used following approach
document.getElementById('myframe').contentWindow.document.body.innerHTML;
It throws error "Permission denied to access property"
Do anyone know how to read and write in cross domain platform

If you don't have control over the framed site, you cannot circumvent the cross-domain policy.
If you have control over both sites, you can use the postMessage method to transfer data across different domains. A very basic example:
// framed.htm:
window.onmessage = function(event) {
event.source.postMessage(document.body.innerHTML, event.origin);
};
// Main page:
window.onmessage = function(event) {
alert(event.data);
};
// Trigger:
// <iframe id="myframe" src="framed.htm"></iframe>
document.getElementById('myframe').contentWindow.postMessage('','*');

In Internet Explorer 8, events passed as a parameter may be null, that is why you need to access the event in a different manner:
In frame.html:
window.onmessage = function(event) {
var evt = event || window.event;
evt.source.postMessage('Message from iFrame', evt.origin);
};
On main.html:
window.onmessage = function(event) {
var evt = event || window.event;
alert(evt.data);
};
The event is triggered the same way as Rob W has presented:
document.getElementById('frameId').contentWindow.postMessage('message','*');

It can happen only if you have control for both sites
you can use postMessage
here's how you can apply it
first, you can add the below code to the site you want to retrieve data from
<script>
function test() {
document.getElementById('idMyIframe').contentWindow.postMessage("your message here", "*");
}
</script>
<iframe id="idMyIframe" onload="test()" src="http://example.otherdomaintosenddatato.com"></iframe>
the second step you can add this code below to the other domain you want to send a message or the data to it
window.addEventListener("message", function (message) {
if (message.origin == "http://firstdomain.com") {
console.log(message)
}
});
and please note you must add the test() function on the onload attribute of the iframe cause if the function runs before the iframe was loaded it will become useless and it won't send data

Cross Domain iframe elements access in React with (srcDoc):-
<iframe srcDoc={this.state.HTML} width='100%' id='iframetnd' onLoad={this.onclickinsideiframe}/>
onclickinsideiframe=()=>{
if(document.getElementById('iframetnd')!==null){
let iframe = document.getElementById('iframetnd');
let innerDocument = (iframe.contentDocument)
? iframe.contentDocument
: iframe.contentWindow.document;
let Obj = innerDocument.getElementsByClassName("navButtons")[0];
if(Obj !== undefined){
Obj.onclick = ()=>this.func();
}
}
}
func=()=>{
this.setState({page:2})
this.arrangeTest();
}

iFrame does not allow to access contents from Cross Domain platform. You can only access if your iFrame is using the same domain.
This solution works same as iFrame. I have created a PHP script that can get all the contents from the other website, and most important part is you can easily apply your custom jQuery to that external content. Please refer to the following script that can get all the contents from the other website and then you can apply your cusom jQuery/JS as well. This content can be used anywhere, inside any element or any page.
<div id='myframe'>
<?php
/*
Use below function to display final HTML inside this div
*/
//Display Frame
echo displayFrame();
?>
</div>
<?php
/*
Function to display frame from another domain
*/
function displayFrame()
{
$webUrl = 'http://[external-web-domain.com]/';
//Get HTML from the URL
$content = file_get_contents($webUrl);
//Add custom JS to returned HTML content
$customJS = "
<script>
/* Here I am writing a sample jQuery to hide the navigation menu
You can write your own jQuery for this content
*/
//Hide Navigation bar
jQuery(\".navbar.navbar-default\").hide();
</script>";
//Append Custom JS with HTML
$html = $content . $customJS;
//Return customized HTML
return $html;
}

Accessing DOM elements inside nested HTML and BODY tags [duplicate]

For say i have a Site called example.com on which iframe is embedded of domain iframe.net, now i want to read the content of iframe and pass some parameter to display a textual message. Like Hi with username.
Now the problem is this able not able to make connection between the two , even am not able to get the innerHTML of iframe i used following approach
document.getElementById('myframe').contentWindow.document.body.innerHTML;
It throws error "Permission denied to access property"
Do anyone know how to read and write in cross domain platform

If you don't have control over the framed site, you cannot circumvent the cross-domain policy.
If you have control over both sites, you can use the postMessage method to transfer data across different domains. A very basic example:
// framed.htm:
window.onmessage = function(event) {
event.source.postMessage(document.body.innerHTML, event.origin);
};
// Main page:
window.onmessage = function(event) {
alert(event.data);
};
// Trigger:
// <iframe id="myframe" src="framed.htm"></iframe>
document.getElementById('myframe').contentWindow.postMessage('','*');

In Internet Explorer 8, events passed as a parameter may be null, that is why you need to access the event in a different manner:
In frame.html:
window.onmessage = function(event) {
var evt = event || window.event;
evt.source.postMessage('Message from iFrame', evt.origin);
};
On main.html:
window.onmessage = function(event) {
var evt = event || window.event;
alert(evt.data);
};
The event is triggered the same way as Rob W has presented:
document.getElementById('frameId').contentWindow.postMessage('message','*');

It can happen only if you have control for both sites
you can use postMessage
here's how you can apply it
first, you can add the below code to the site you want to retrieve data from
<script>
function test() {
document.getElementById('idMyIframe').contentWindow.postMessage("your message here", "*");
}
</script>
<iframe id="idMyIframe" onload="test()" src="http://example.otherdomaintosenddatato.com"></iframe>
the second step you can add this code below to the other domain you want to send a message or the data to it
window.addEventListener("message", function (message) {
if (message.origin == "http://firstdomain.com") {
console.log(message)
}
});
and please note you must add the test() function on the onload attribute of the iframe cause if the function runs before the iframe was loaded it will become useless and it won't send data

Cross Domain iframe elements access in React with (srcDoc):-
<iframe srcDoc={this.state.HTML} width='100%' id='iframetnd' onLoad={this.onclickinsideiframe}/>
onclickinsideiframe=()=>{
if(document.getElementById('iframetnd')!==null){
let iframe = document.getElementById('iframetnd');
let innerDocument = (iframe.contentDocument)
? iframe.contentDocument
: iframe.contentWindow.document;
let Obj = innerDocument.getElementsByClassName("navButtons")[0];
if(Obj !== undefined){
Obj.onclick = ()=>this.func();
}
}
}
func=()=>{
this.setState({page:2})
this.arrangeTest();
}

iFrame does not allow to access contents from Cross Domain platform. You can only access if your iFrame is using the same domain.
This solution works same as iFrame. I have created a PHP script that can get all the contents from the other website, and most important part is you can easily apply your custom jQuery to that external content. Please refer to the following script that can get all the contents from the other website and then you can apply your cusom jQuery/JS as well. This content can be used anywhere, inside any element or any page.
<div id='myframe'>
<?php
/*
Use below function to display final HTML inside this div
*/
//Display Frame
echo displayFrame();
?>
</div>
<?php
/*
Function to display frame from another domain
*/
function displayFrame()
{
$webUrl = 'http://[external-web-domain.com]/';
//Get HTML from the URL
$content = file_get_contents($webUrl);
//Add custom JS to returned HTML content
$customJS = "
<script>
/* Here I am writing a sample jQuery to hide the navigation menu
You can write your own jQuery for this content
*/
//Hide Navigation bar
jQuery(\".navbar.navbar-default\").hide();
</script>";
//Append Custom JS with HTML
$html = $content . $customJS;
//Return customized HTML
return $html;
}

change iframe height according to content

iframe tag:
<iframe scrolling="no" style="height: 956px; width: 100%" frameborder="0" id="ampcontentiframe"></iframe>
i am trying to resize iframe height on content load.i tried other solutions from:
Link1
Link2
Link3
But none of them solved my problem.i tried calling resize function on window load as well as iframe load.but the height it sets every time is different(sometimes actual content height and sometimes original height of iframe).
Any help guys.....??
FYI:I also tried by removing scrolling attr from iframe.but it didn't work

This is one of those problems that really is harder than it should be. Here are the things you need to consider, in order to keep an iFrame sized correctly.
Working out an accurate height
Getting an accurate height for the iFrame is not as simple as it should be, as you have a choice of six different properties that you can check and none of them give a constantly right answer. The best solution I've come up with is this function that works so long as you don't use CSS to overflow the body tag.
function getIFrameHeight(){
function getComputedBodyStyle(prop) {
return parseInt(
document.defaultView.getComputedStyle(document.body, null),
10
);
}
return document.body.offsetHeight +
getComputedBodyStyle('marginTop') +
getComputedBodyStyle('marginBottom');
}
This is the IE9 version, for the much long IE8 version see this answer.
If you do overflow the body and you can't fix your code to stop this, then using either the offsetHeight or scrollHeight properties of document.documentElement are your best options. Both have pros and cons and it best just to test both and see which works for you.
PostMessage
The postMessage API provides a simple method for comunicating between an iFrame and it's parent.
To send a message to the parent page you call it as follows.
parent.postMessage('Hello parent','http://origin-domain.com');
In the other direction we can send the message to the iFrame with the following code.
var iframe = document.querySelector('iframe');
iframe.contentWindow.postMessage('Hello my child', 'http://remote-domain.com:8080');
To recevie a message create an event listerner for the message event.
function receiveMessage(event)
{
if (event.origin !== "http://remote-domain.com:8080")
return;
console.log(event.data);
}
if ('addEventListener' in window){
window.addEventListener('message', receiveMessage, false);
} else if ('attachEvent' in window){ //IE
window.attachEvent('onmessage', receiveMessage);
These examples uses the origin property to limit where the message is sent to and to check where it came from. It is possible to specify * to allow sending to any domain and you may in some cases you may want to accept messages from any domain. However, if you do this you need to consider the security implications and implement your own checks on the incoming message to ensure it contains what your expecting. In this case the iframe can post it's height to '*', as we might have more than one parent domain. However, it's a good idea to check incoming messages are from the iFrame.
function isMessageFromIFrame(event,iframe){
var
origin = event.origin,
src = iframe.src;
if ((''+origin !== 'null') && (origin !== src.substr(0,origin.length))) {
throw new Error(
'Unexpect message received from: ' + origin +
' for ' + iframe.id + '. Message was: ' + event.data
);
}
return true;
}
MutationObserver
The other advance in more modern broswers is MutationObserver which allows you to watch for changes in the DOM; so it is now possible to detect changes that could effect the size of the iFrame without having to constantly poll with setInterval.
function createMutationObserver(){
var
target = document.querySelector('body'),
config = {
attributes : true,
attributeOldValue : false,
characterData : true,
characterDataOldValue : false,
childList : true,
subtree : true
},
observer = new MutationObserver(function(mutations) {
parent.postMessage('[iframeResize]'+document.body.offsetHeight,'*');
});
log('Setup MutationObserver');
observer.observe(target, config);
}
var MutationObserver = window.MutationObserver || window.WebKitMutationObserver;
if (MutationObserver){
createMutationObserver();
}
Other issues
Other things to consider include, having more than one iFrame on the page, CSS :Checkbox and :Hover events causing page resize, avoiding the use of height auto in the iFrames' body and html tags and lastly the window being resized.
IFrame Resizer Library
I've wrapped all this up in a simple dependancy free library, that also provides some extra functions not discussed here.
https://github.com/davidjbradshaw/iframe-resizer
This works with IE8+.

You can try with the following script.
<script type="text/javascript">
function iframeLoaded() {
var iFrameID = document.getElementById('your_frame_id');
if(iFrameID) {
iFrameID.height = "";
iFrameID.height = iFrameID.contentWindow.document.body.scrollHeight + "px";
}
}
</script>
and add onload function to your iframe like
<iframe onload="iframeLoaded()">

Try with this if you want to scroll bar for iframe
<iframe style="height: 956px;overflow-y:scroll; width: 100%" frameborder="0" id="ampcontentiframe"></iframe>
just put "min-height" and add "overflow-y" prop as scroll it will work
or if you dont want to scroll then try like
<iframe scrolling="no" style="min-height: 956px; width: 100%" frameborder="0" id="ampcontentiframe"></iframe>

iframe Auto Adjust Height as content changes

I have an iframe as you can see on the following link;-
http://one2onecars.com
The iframe is the online booking in the centre of the screen. The problem I have is that although the height of the iframe is okay as the page loads, I need it to somehow auto adjust the height as the page content adjusts. For example, if I do a postcode search in the online booking it creates a dropdown menu and then makes the 'Next Step' button not viewable.
What I need to happen is that when the content of the online booking changes, the iframe auto adjusts to the new height of the iframe (dynamically) as it is not loading any other pages.
I have tried several different scripts using jquery to try resolving this issue, but they all only seem to auto adjust the height of the iframe when the page first loads and not as the contents of the iframe changes.
Is this even possible to do?
The code I have at the moment is with a set height at the moment:-
<div id="main-online-booking">
<iframe id="main-online-frame" class="booking-dimensions" src="http://www.marandy.com/one2oneob/login-guest.php" scrolling="no" frameborder="0"></iframe>
</div>
#main-online-booking {
height: 488px;
border-bottom: 6px #939393 solid;
border-left: 6px #939393 solid;
border-right: 6px #939393 solid;
z-index: 4;
background-color: #fff;
}
.booking-dimensions {
width: 620px;
height: 488px;
}
If anybody can help me with this I would be much appreciated!

setInterval
The only (corrected due to advances in browser tech, see David Bradshaw's answer) backwards compatible way to achieve this with an iframe is to use setInterval and keep an eye on the iframe's content yourself. When it changes its height, you update the size of the iframe. There is no such event you can listen out for that will make it easy unfortunately.
A basic example, this will only work if the iframe content that has changed in size is part of the main page flow. If the elements are floated or positioned then you will have to target them specifically to look for height changes.
jQuery(function($){
var lastHeight = 0, curHeight = 0, $frame = $('iframe:eq(0)');
setInterval(function(){
curHeight = $frame.contents().find('body').height();
if ( curHeight != lastHeight ) {
$frame.css('height', (lastHeight = curHeight) + 'px' );
}
},500);
});
Obviously depending on what you want you can modify the perspective of this code so that it works from the iframe, on itself, rather than expecting to be part of the main page.
cross-domain issue
The problem you will find is that due to browser security it wont let you access the content of the iframe if it is on a different host to the main page, so there isn't actually anything you can do unless you have a way of adding any script to the html that appears in the iframe.
ajax
Some others are suggesting trying to use the third-party service via AJAX, unless the service supports this method it will be very unlikely you'll be able to get it to work -- especially if it is a booking service that will most likely need to operate over https/ssl.
As it appears you have full control over the iframe content, you have full options open to you, AJAX with JSONP would be an option. However, one word of warning. If your booking system is multistepped you need to make sure you have a well designed UI -- and possibly some history/fragment management code -- if you are to go down the AJAX route. All because you can never tell when a user will decide to navigate forward or back in their browser (which an iframe would automatically handle, within reason). A well designed UI can detract users from doing this.
cross-domain communication
If you have control of both sides (which it sounds like you do) you also have the cross domain communication option using window.postMessage - see here for more information https://developer.mozilla.org/en-US/docs/DOM/window.postMessage

Modern browser and in part IE8 have some new features that make this task easier than it use to be.
PostMessage
The postMessage API provides a simple method for comunicating between an iFrame and it's parent.
To send a message to the parent page you call it as follows.
parent.postMessage('Hello parent','http://origin-domain.com');
In the other direction we can send the message to the iFrame with the following code.
var iframe = document.querySelector('iframe');
iframe.contentWindow.postMessage('Hello my child', 'http://remote-domain.com:8080');
To recevie a message create an event listerner for the message event.
function receiveMessage(event)
{
if (event.origin !== "http://remote-domain.com:8080")
return;
console.log(event.data);
}
if ('addEventListener' in window){
window.addEventListener('message', receiveMessage, false);
} else if ('attachEvent' in window){ //IE
window.attachEvent('onmessage', receiveMessage);
These examples uses the origin property to limit where the message is sent to and to check where it came from. It is possible to specify * to allow sending to any domain and you may in some cases you may want to accept messages from any domain. However, if you do this you need to consider the security implications and implement your own checks on the incoming message to ensure it contains what your expecting. In this case the iframe can post it's height to '*', as we might have more than one parent domain. However, it's a good idea to check incoming messages are from the iFrame.
function isMessageFromIFrame(event,iframe){
var
origin = event.origin,
src = iframe.src;
if ((''+origin !== 'null') && (origin !== src.substr(0,origin.length))) {
throw new Error(
'Unexpect message received from: ' + origin +
' for ' + iframe.id + '. Message was: ' + event.data
);
}
return true;
}
MutationObserver
The other advance in more modern broswers is MutationObserver which allows you to watch for changes in the DOM; so it is now possible to detect changes that could effect the size of the iFrame without having to constantly poll with setInterval.
function createMutationObserver(){
var
target = document.querySelector('body'),
config = {
attributes : true,
attributeOldValue : false,
characterData : true,
characterDataOldValue : false,
childList : true,
subtree : true
},
observer = new MutationObserver(function(mutations) {
parent.postMessage('[iframeResize]'+document.body.offsetHeight,'*');
});
log('Setup MutationObserver');
observer.observe(target, config);
}
var MutationObserver = window.MutationObserver || window.WebKitMutationObserver;
if (MutationObserver){
createMutationObserver();
}
Working out an accurate height
Getting an accurate height for the iFrame is not as simple as it should be, as you have a choice of six different properties that you can check and none of them give a constantly right answer. The best solution I've come up with is this function that works so long as you don't use CSS to overflow the body tag.
function getIFrameHeight(){
function getComputedBodyStyle(prop) {
return parseInt(
document.defaultView.getComputedStyle(document.body, null),
10
);
}
return document.body.offsetHeight +
getComputedBodyStyle('marginTop') +
getComputedBodyStyle('marginBottom');
}
This is the IE9 version, for the much long IE8 version see this answer.
If you do overflow the body and you can't fix your code to stop this, then using either the offsetHeight or scrollHeight properties of document.documentElement are your best options. Both have pros and cons and it best just to test both and see which works for you.
Other issues
Other things to consider include, having more than one iFrame on the page, CSS :Checkbox and :Hover events causing page resize, avoiding the use of height auto in the iFrames' body and html tags and lastly the window being resized.
IFrame Resizer Library
I've wrapped all this up in a simple dependancy free library, that also provides some extra functions not discussed here.
https://github.com/davidjbradshaw/iframe-resizer
This works with IE8+.

I wrote this script and it's working perfectly for me. Feel free to use it!
function ResizeIframeFromParent(id) {
if (jQuery('#'+id).length > 0) {
var window = document.getElementById(id).contentWindow;
var prevheight = jQuery('#'+id).attr('height');
var newheight = Math.max( window.document.body.scrollHeight, window.document.body.offsetHeight, window.document.documentElement.clientHeight, window.document.documentElement.scrollHeight, window.document.documentElement.offsetHeight );
if (newheight != prevheight && newheight > 0) {
jQuery('#'+id).attr('height', newheight);
console.log("Adjusting iframe height for "+id+": " +prevheight+"px => "+newheight+"px");
}
}
}
You can call the function inside a loop:
<script>
jQuery(document).ready(function() {
// Try to change the iframe size every 2 seconds
setInterval(function() {
ResizeIframeFromParent('iframeid');
}, 2000);
});
</script>

ResizeObserver allows your code to remain encapsulated inside the iframe and decoupled from the outer scope (i.e., versus postMessage), and it is ligher weight than the general-purpose MutationObserver.
Simple example below (or good example at Mozilla):
const myElement = document.getElementById('my-element');
const resizeObserver = new ResizeObserver((entries) => {
const dims = myElement.getBoundingClientRect(); // or see Mozilla for `entries` example
console.log(`new height (${dims.height}) and width (${dims.width})`);
});
resizeObserver.observe(myElement);

use this script:
$(document).ready(function () {
// Set specific variable to represent all iframe tags.
var iFrames = document.getElementsByTagName('iframe');
// Resize heights.
function iResize() {
// Iterate through all iframes in the page.
for (var i = 0, j = iFrames.length; i < j; i++) {
// Set inline style to equal the body height of the iframed content.
iFrames[i].style.height = iFrames[i].contentWindow.document.body.offsetHeight + 'px';
}
}
// Check if browser is Safari or Opera.
if ($.browser.safari || $.browser.opera) {
// Start timer when loaded.
$('iframe').load(function () {
setTimeout(iResize, 0);
});
// Safari and Opera need a kick-start.
for (var i = 0, j = iFrames.length; i < j; i++) {
var iSource = iFrames[i].src;
iFrames[i].src = '';
iFrames[i].src = iSource;
}
} else {
// For other good browsers.
$('iframe').load(function () {
// Set inline style to equal the body height of the iframed content.
this.style.height = this.contentWindow.document.body.offsetHeight + 'px';
});
}
});
Note : use it on webserver.