Calling a javascript function in a document created with document.write - javascript

I have a web page with a button. The click code is:
var html = ...html string containing visual and script elements...
var view = window.open();
view.document.write(html);
view.init(<parameters>); // see next code block
the html content is:
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<style type="text/css">
html, body {
height: 100%;
margin: 0;
}
</style>
</head>
<body>
<div id="id1"></div>
<script>
function init(<parameters>) {
...work...
}
</script>
</body>
</html>
The problem is with the init function call in chrome: all good if I am in IE, but in chrome I get "init function not defined" exception.
How should I do to get this working in all browsers? Of course I am looking for a solution that doesn't require a server round trip.

IM a noob so idk if this is exaclty true but i have read that ie allows you to do alot more then chrome or firefox. It might be one of those example where ie will let you do something.

using document.write does in fact work when it comes to create the page I want. Problem is when I want to call a function defined in a javascript block inside that page. Different browsers give different results so I guess this is a matter not completely standardized yet. There are posts in the internet about this, but I couldn't find a clear and common answer.
I then solved my impasse with a workaround. The initial markup contains now placeholders for the parameters:
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<style type="text/css">
html, body {
height: 100%;
margin: 0;
}
</style>
</head>
<body>
<div id="id1"></div>
<script>
(init = function () {
var parameter1 = ${{placeholder1}}
var parameter2 = ${{placeholder2}}
...
...work...
})();
</script>
</body>
</html>
The creating code, then, replaces the placeholders with actual values:
var html = ...html string containing placeholders...
html = html.replace("${{placeholder1}}", actual1);
html = html.replace("${{placeholder2}}", actual2);
...
var view = window.open();
view.document.write(html);
Now the init function is called in the same page context, and this works in Chrome as well.

It is not possible to write to a new window if its not on the same domain. What I suggest is that you can open an iframe an work inside that.
How to write to iframe
How to write to page on same domain

Related

How to get reference to the iframe from which script html tag was generated?

I have small snippet that is inside iframe and generates script html tag and appends it to the window.top.document.head.
Now I want to know how do I check from within potato.js from which iframe it was generated from once it is already loaded?
<!DOCTYPE html>
<html lang="en">
<head>
</head>
<body>
<iframe>
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<script>
(function() {
var s = document.createElement('script');
s.setAttribute('type','text/javascript');
s.setAttribute('src','https://test.com/potato.js');
window.top.document.head.appendChild(s);
})();
</script>
</body>
</html>
</iframe>
</body>
</html>
Edit: I can not change this code inside the iframe
That information isn't stored automatically.
The only way I can think of would be to add an expando-prop to the script with a reference to the current window (i.e. the frame's window)…
s.sourceWindow = window;
… then read that from within potato.js …
const sourceWindow = document.currentScript.sourceWindow;
… and then loop over all the frames (window.frames) looking for a match.
Since you are using window.top and not window.parent you might need to be recursive there.

JS - Cloning part of an external webpage

I'm trying to include a table from a webpage in a different domain.
I went for the easiest path using a proxy to fulfill my request and embedded the page directly into an iFrame.
Everything works fine but I'm still missing my initial (and final) objective: clone exactly (and only) one portion of the page, not the whole thing.
This is the simple snippet:
function loadIframe() {
var _body = document.getElementsByTagName('body')[0];
var _div = document.createElement('iframe');
_div.src = "http://cors.io/?https://eshop-prices.com/?currency=EUR";
_div.id = "iFrame";
_div.width = "100%";
_div.height = "1080";
_body.appendChild(_div);
}
loadIframe();
<!DOCTYPE html>
<head lang="en">
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>eShop Prices</title>
</head>
<body>
<script type="application/javascript" src="js/util.js"></script>
</body>
</html>
Run this outside of stackoverflow or you'll see an empty iframe.

Polymer Element not registered in polymer from string/text

Can someone help me with stating what am I doing wrong in this example -- http://jsbin.com/bekoxo/2/edit?html,output#H:L23
The screenshot for the chrome inspector is at -
https://www.dropbox.com/s/t6uua7h714h2otg/Screenshot%202014-10-13%2001.32.54.png?dl=0
I can figure out that the element (appler-page) is not registered successfully, template shows document-fragment instead of desired shadow-root
the 2nd element, where polymer definition is part of the markup(same markup) is rendered successfully.
Can someone point out what am I missing in order to make the first part of example also work.
(which is creating an element via javascript and using it immediately)
EDIT --- problem code below
<head>
<script src="//cdnjs.cloudflare.com/ajax/libs/polymer/0.3.3/platform.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/polymer/0.3.3/polymer.js"></script>
<meta name="description" content="problem with dynamically building a polymer element" />
<script src="//code.jquery.com/jquery-1.9.1.min.js"></script>
<script>
var scr = '<polymer-element name="appler-page"><template>template content {{test}}</template><script>var proxymodel = {};proxymodel["test"] = "testfie" ;'+
'Polymer(proxymodel);<\/script><\/polymer-element><appler-page><\/appler-page>';
$(document).ready(function(){
document.getElementById("fie").onclick = function(){
var divel = document.createElement("div");
divel.innerHTML = scr;
document.querySelector(".polymerized").innerHTML = "";
document.querySelector(".polymerized").appendChild(divel);
}
});
</script>
<meta charset="utf-8">
<title>JS Bin</title>
</head>
<body>
<input type="button" id="fie" value="fie"/>
<div class="polymerized">before content</div>
EDIT -- A better jsbin for the problem
http://jsbin.com/bekoxo/2/edit?html,output#H:L23
Here is one way in which you can register your element imperatively (which, I believe is what your first element is trying to do). I've simplified your example a bit.
<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
</head>
<body>
<script src="http://www.polymer-project.org/platform.js"></script>
<link rel="import"
href="http://www.polymer-project.org/components/polymer/polymer.html">
<script>
Polymer('appler-page', {test: 'testfile'});
var el = document.createElement('div');
el.innerHTML = '\
<polymer-element name="appler-page">\
<template>template content {{test}}</template>\
</polymer-element>';
document.body.appendChild(el);
</script>
<appler-page></appler-page>
</body>
</html>
See http://jsbin.com/qifupa/edit
Another instance of staying up with the latest Polymer version I found.
here's the working piece of code that may help anyone else if they are attempting the same thing.
I switched to Polymer-project.org addresses for the imports and it worked.
http://jsbin.com/bekoxo/14/edit?html,output#H:L23

How to display variables from external JavaScript in HTML. Internet Explorer 7

I realize this is a horribly newbie question, but Ive been trying to fix it for days trying different methods so I just wanted to ask what would you do.
I am attempting to create a web program to use at work, and I have this setup:
Windows 7
IE 7 - Cannot Upgrade.
The "website" is not a webhost, basicly I have a folder on my desktop with html/css/js files and I use IE to run the scripts, no host.
I want to keep a set of vars, mostly strings, in an external JS file and pull the JS into different HTML pages. I want it to write on load of the document.. not on ready. It does not have to be user dynamtic.
Also, When I make the js file, does it have to have a header.. like HTML has doctypes?
I really appreciate your help as I am trying to learn and will cont on my own from here. My setup is much different than most, and im not sure which part was causing my problem so I finally broke down and posted.
When you write your JavaScript file it doesn't have to have any header or doctype. For example you can have a variables.js file that looks just like this:
var x = "abc";
var y = "def";
and have many HTML files that include variables.js like this:
<!doctype html>
<html lang=en>
<head>
<meta charset=utf-8>
<title>title</title>
</head>
<body>
<!-- page content -->
<script src="variables.js"></script>
<script>
alert(x);
</script>
</body>
</html>
and your variables should be available there. Any script that is included after the reference to your variables.js should have access to everything that was included before without the need to listen to any events.
If you need to listen to the events then I suggest to use jQuery or some other JavaScript framework. An example for jQuery would be:
$(window).load(function() {
alert(x);
});
A more advanced example of changing the DOM elements:
<!doctype html>
<html lang=en>
<head>
<meta charset=utf-8>
<title>title</title>
</head>
<body>
<p>Select variable:</p>
<p>
Show x
Show y
</p>
<p>Value:</p>
<p id="value"></p>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script src="variables.js"></script>
<script>
$('#show-x').click(function (e) {
e.preventDefault();
$('#value').html(x);
});
$('#show-y').click(function (e) {
e.preventDefault();
$('#value').html(y);
});
</script>
</body>
</html>
If it's not a global variable, you can't display/print/access or whatever you call it because it has a local scope, defined in a function.
You can probably only use a debugger simply to debug it

IE8 strange behavior, my problem or bug?

OK guys this is intreting,
I'm testing this page
http://static.nemesisdesign.net/demos/ie8-strange/test.html
on IE8 / windows XP.
This is the code:
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="content-language" content="en">
<title>Test</title>
</head>
<body>
<div id="thisgivesmeanerror">test</div>
<script>
thisgivesmeanerror = 'test';
alert('this alert won\'t be fired on my IE8, what about yours?');
</script>
</body>
</html>
If I open this page with IE8 I get an error.
If I change the code of the script to:
<script>
// note that I added var prefix
var thisgivesmeanerror = 'test';
alert('this alert won\'t be fired on my IE8, what about yours?');
</script>
It works fine.
This happens only on IE 7/8, didn't test it on IE6.
What do you think?
Does it happen to you also? Or is it just my browser that has gone crazy?
Addition
You're saying that is just not using the var prefix that cause the error?
I'm sorry guys but you're wrong, you didn't take time to test the code.
I uploaded a test2 page
http://static.nemesisdesign.net/demos/ie8-strange/test2.html
with the follwing cocde
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="content-language" content="en">
<title>Test 2</title>
</head>
<body>
<div id="thisgivesmeanerror">test</div>
<script>
thisdoesntgiveanyerror = 'test';
alert('This alert will be fired correcly');
</script>
</body>
</html>
That works fine.
So what is actually causing the error? The variable name without the var prefix having the same name as the ID of the DIV element.
Isn't this strange?
May be the answers to this SO-question can help?
You should always precede your variable declarations with var to specify their scope or you might observe inconsistent behavior between different browsers.
use var to declare variables instead of just plugging their name
I'd say the JavaScript interpreter in IE is slightly stricter than on FireFox and others, meaning the script returns an error when it comes to the variable definition line. Putting var in will ensure it actually is a variable.
It's very good practice to declare all your variables with var
James
EDIT
I can't get to IE at the moment, but I can recommend you change your <script> tag to <script type="text/javascript">.

Categories

Resources