document.write erase buttons - javascript

I have a html page with buttons:
<INPUT TYPE=BUTTON VALUE="b1" onclick="init1()" >
init1:
document.innerHTML = "<object type='application/x-app' id='plugin' width='0' height='0' > </object>"
When I press the button b1 it erase the page and it just blank.
What am I doing wrong?
10xs,
Nir

Use appendChild on body instead of replacing (=). Your button will not get erased.
var object = document.createElement("object");
object.innerHTML = "<object...";
document.body.appendChild(object);

You need to adres proper anchor (place) in your code (in the DOM tree).
Try this instead:
var my_anchor = document.getElementById('element_in_DOM');
my_anhor.innerHTML = "<object type='application/x-app' id='plugin' width='0' height='0' > </object>"

Of course it erases the page. When you modify the .innerHTML of the -entire document-, and replace it with something else, that's what happens.
If you want to append that tag onto the document however, that's a different story. I would suggest the following to do such:
var your_element = document.createElement('object');
your_element.type = 'application/x-app';
your_element.id = 'plugin'
your_element.width = 0;
your_element.height = 0;
document.body.appendChild(your_element);​
DEMO

Related

Display a link inside an if-condition using javascript

How can I display a href link inside an if condition using javascript?
<!DOCTYPE html>
<html>
<body>
<script>
function myFunction() {
var x = document.getElementById("fname");
if(x.value.indexOf("aaaa")>=0)document.getElementById("result").innerHTML= ""+ x.value + "" ;
else document.getElementById("result").innerHTML=x.value;
}
</script>
<form method="post" action="esegui.php">
Name<br><input type="text" id="fname" onkeyup="myFunction()">
</form>
<p id="result"></p>
</body>
</html>
You can create anchor tag using JavaScript following way:
var aTag = document.createElement('a');
aTag.setAttribute('href',"http://www.google.com");
aTag.innerHTML = "aaa";
document.body.appendChild(aTag);
Put above code in if condition will create anchor tag(link).
Although your question is a little bit confusing, I'll try to help you
If what you want is to create a specific link, do this:
var link = window.document.createElement("a");
var str = window.document.getElementById("theidofyourinput").value;
link.textContent = str;
link.href = 'http://www.linkofyourpage';
document.getElementsByTagName('body')[0].appendChild(link);
Try researching the createElement() method in JavaScript, calling it to create an anchor element in the body of your if statement e.g.
var myLink = document.createElement('a');
myLink.appendChild(document.createTextNode('link name')); //visible text
myLink.setAttribute('href', 'http://google.com'); //link href attribute
document.getElementById('someId').appendChild(myLink); //append the element
There are many ways to do this but you have not mentioned specific scenario so do like this:
In HTML:
<div id="test"></div>
In Java script:
var markup = "link";
var v = document.getElementById("test") ;
v.innerHtml(v );

Display html link with javascript

In some part of an html page, I have a link with the following code :
<a id="idname" class="classname" href="www.MySite.com/image-name.jpg">link-text</a>
I would like to automatically display the same link in another part of the same page by using a javascript.
What would be the script to insert in my page ?
Thank you in advance for any help in this matter.
Patrick
Try this:
myVar = document.getElementById("idname");
varLink = (myVar.attributes.href);
As son as you know the target id:
<div id="targetID">New Link: </div>
<div id="targetID2">New Link 2: </div>
And If you are using jQuery you can do like this:
var link = $("#idname").clone();
link.attr("id",link.attr("id") + (Math.random() * 10));
$("#targetID").append(link);
If not:
var link = document.getElementById("idname");
var newLink = document.createElement("a");
newLink.href = link.href;
newLink.className = link.className;
newLink.innerHTML = link.innerHTML;
newLink.id = link.id + (Math.random() * 10);
document.getElementById("targetID2").appendChild(newLink);
See this Example
<script>
window.onload = function() {
// get data from link we want to copy
var aHref = document.getElementById('idname').href;
var aText = document.getElementById('idname').innerHTML;
// create new link element with data above
var a = document.createElement('a');
a.innerHTML = aText;
a.href = aHref;
// paste our link to needed place
var placeToCopy = document.getElementById('anotherplace');
placeToCopy.appendChild(a);
}
</script>
Use code above, if you want just to copy your link to another place. JSFiddle
First, I want to point out that if you will just copy the element that will throw an error because the copied element will have the same id of the first one, so if you will create a copy of your element you don't have to give it the same id.
Try this code:
function copyLink(newDestination){
var dest=document.getElementById(newDestination);
var newLink=document.createElement("a");
var myLink=document.getElementsByClassName("classname")[0];
newLink.href=myLink.href;
newLink.className = myLink.className;
newLink.innerHTML = myLink.innerHTML;
newDestination.appendChild(newLink);
}
The newDestination parameter is the container element of the new Link.
For example if the new Container element has the id "div1":
window.onload = function() {
copyLink(div1);
}
Here's a DEMO.
Thank you very much to everyone for so many prompt replies.
Finally, I was able to use Jquery.
So, I tried the solution given by Andrew Lancaster.
In my page, I added the codes as follows, in this order :
1-
<span id="span1">
<a class="classname" href="www.MySite.com/image-name.jpg">link-text</a>
</span>
<p>
<span id="span2"></span>
</p>
and further down the page :
2-
<script type="text/javascript">
var span1val = $('#span1').html();
$('#span2').html(span1val);
</script>
Therefore, the two expected identical links are properly displayed.
But, unfortunately, I forgot to say something in my initial request:
the original link is in the bottom part of my page
I would like to have the duplicated link in a upper part of my page
So, would you know how to have the duplicated link above the original link ?
By the way, to solve the invalid markup mentioned by David, I just deleted id="idname" from the original link (that I could ignored or replaced by other means).
Thank you again in advance for any new reply.
Patrick
Using Jquery you could wrap your link in a span with an ID and then get the value of that ID and push it into another span id.
HTML
<span id="span1">
<a id="idname" class="classname" href="www.MySite.com/image-name.jpg">link-text</a>
</span>
<p>
<span id="span2"></span>
</p>
jQuery
var span1val = $('#span1').html();
$('#span2').html(span1val);
Example can be found here.
http://jsfiddle.net/3en2Lgmu/5/

How to get label's id?

This is index.html
<html>
<head>
<script language="javascript" type="text/javascript" src="add.js"></script>
<script language="javascript" type="text/javascript" src="get.js"></script>
</head>
<body>
<div id="list">
<form id="programs" name="programs">
</form>
<input type="button" value="add" onClick="add();" />
<input type="button" value="delete" onClick="get();" />
</div>
</body>
</html>
This is add.js
var program_number = 0;
function add()
{
var program_name = "program_sample";
var formID = document.getElementById("programs");
var labelTag = document.createElement("label");
var inputTag = document.createElement("input");
var txtNode = document.createTextNode("program " + program_number);
var brTag = document.createElement("br");
// set input attribute
inputTag.setAttribute("type", "checkbox");
inputTag.setAttribute("name", program_name);
inputTag.setAttribute("value", "program" + program_number);
// set label attribute
labelTag.setAttribute("id", "program_label" + program_number);
labelTag.appendChild(inputTag);
labelTag.appendChild(txtNode);
labelTag.appendChild(brTag);
formID.appendChild(labelTag);
program_number++;
}
This is get.js
function get()
{
var programs = document.programs;
for(var i = 0; i < programs.length; i++)
console.log(programs[i].id);
}
Hello, I want to get the label's id dynamically. add.js code makes it. (below)
<label id="program_label0>
<input type="checkbox" name="program_sample" value="program0" />
program 0<\br>
</label>
If those run normally, the result can be "program_label1", "program_label2", "program_label3" ...
but the result of get.js is just a blank. What should I do to get label's id ..?
or Where my code is wrong ..?
Inside your 'get.js' you could try either
var programs = document.getElementById("programs");
or
var programs = document.forms["programs"];
or
var programs = document.forms[0];
The last one will work only if the form you are referring to is only presented first inside DOM tree.
I see a few problems:
Inputs in the beginning html are outside the form...(Please refer to w3schools form basics)
Instead of inputTag.setAttribute("type", "checkbox");, you should use inputTage.type = "checkbox";
There is no such thing as documents.programs. To access your programs DOM element, please do as in your add.js and document.getElementById("programs");
You do not seem clear on how basics work. - var formID = document.getElementById("programs"); will not return a formID... will return a DOM element. Please read more basic tutorials. Start at - w3schools
First: Why are you using setAttribute over setting the properties?
Second:
var programs = document.getElementById("programs");
More than likely you mean to access window.programs in your code, which only works had that element been in the document when you loaded the page.
When you create an element and add it to the DOM, it does not update the global object (here called window), with that new property name.
You should access form element with `document.programs.elements[i]. So you have missed "elements" which is collection of form elements.

Pass variables to code <input type="image" src="imageSrc;" >

hope someone can help a noob. Many thanks in advance.
I have an index page with links to hundreds of other pages holding song words.
I have built each song page but it would be MUCH simpler to have one MASTER page that took a variable from the index page and found the corresponding words (which exist as png graphics.)
I have sorted Step 1 - I can pass a variable from the index page to the master page using:
<a href="javascript: window.open('MUSIC/beatles/mastertest2.html?song=ER', '_parent')">
where song=ER is the variable to display the words for Eleanor Rigby. For Step 2, I can also retrieve that information in the master page with:
var imageSrc = (qs("song")+".png"); document.write(imageSrc);
which will display the text ER.png which is the name of the image I want to display.
For Step 3 I am trying to get this same variable read into:
<input type="image" src="imageSrc;">
to display the picture. I have searched this and other forums for days now and nothing suggested works for me. I could be missing out an essential early step in the coding?
Update:
My master html file has this code to retrieve the variable:
function qs(search_for) {
var query = window.location.search.substring(1);
var parms = query.split('&');
for (var i=0; i<parms.length; i++) {
var pos = parms[i].indexOf('=');
if (pos > 0 && search_for == parms[i].substring(0,pos)) {
return parms[i].substring(pos+1);;
}
}
return "";
}
And it uses this code to disply the variable (appended with .png) just to prove to me that it is getting through:
var imageSrc = (qs("song")+".png");
document.write(imageSrc);
Then I am trying to feed the variable into a routine to display the png selected. The next script doesn't work but I am thrashing about trying anything right now:
var imageSrc = (qs("song")+".png");
document.write(imageSrc);
<input type="image" src="#imageSrc;" border="0" value="Notes" onClick="placeIt(); showIt()">
<input id="song-image" type="image">
var imageSrc = 'ER.png';
var input = document.getElementById('song-image');
input.src = imageSrc;
If you have already <input type="image"> in your HTML page, you must add an id and then set it's src attribute with
HTML:
<input id="song-image" type="image">
JS:
var imageSrc = 'http://www.lorempixel.com/200/100';
var input = document.getElementById('song-image');
input.src = imageSrc;
JSFiddle for testing.
If I understood you right, its very simple. Are you looking for this?
var input = document.createElement('input');
input.type = 'image';
input.src = imageSrc;
document.body.appendChild(input);
If you can print the variable imageSrc using document.write, then you can use it like shown above.

Changing data content on an Object Tag in HTML

I have an HTML page which contains an Object tag to host an embedded HTML page.
<object style="border: none;" standby="loading" id="contentarea"
width="100%" height="53%" type="text/html" data="test1.html"></object>
However, I need to be to change the HTML page within the object tag. The current code seems to create a clone of the object and replaces the existing object with it, like so:
function changeObjectUrl(newUrl)
{
var oContentArea = document.getElementById("contentarea");
var oClone = oContentArea.cloneNode(true);
oClone.data = newUrl;
var oPlaceHolder = document.getElementById("contentholder");
oPlaceHolder.removeChild(oContentArea);
oPlaceHolder.appendChild(oClone);
}
This seems a rather poor way of doing this. Does anyone know the 'correct' way of changing the embedded page?
Thanks!
EDIT: In response to answers below, here is the full source for the page I am now using. Using the setAttribute does not seem to change the content of the Object tag.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Test</title>
<script language="JavaScript">
function doPage()
{
var objTag = document.getElementById("contentarea");
if (objTag != null)
{
objTag.setAttribute('data', 'Test2.html');
alert('Page should have been changed');
}
}
</script>
</head>
<body>
<form name="Form1" method="POST">
<p><input type="button" value="Click to change page" onclick="doPage();" /></p>
<object style="visibility: visible; border: none;" standby="loading data" id="contentarea" title="loading" width="100%" height="53%" type="text/html" data="test1.html"></object>
</form>
</body>
</html>
The Test1.html and Test2.html pages are just simple HTML pages displaying the text 'Test1' and 'Test2' respectively.
You can do it with setAttribute
document.getElementById("contentarea").setAttribute('data', 'newPage.html');
EDIT:
It is also recommended that you use the window.onload to ensure that the DOM has loaded, otherwise you will not be able to access objects within it.
It could be something like this:
function changeData(newURL) {
if(!document.getElementById("contentarea"))
return false;
document.getElementById("contentarea").setAttribute('data', newURL);
}
window.onload = changeData;
You can read more about window.onload here
This seems to be a browser bug, setAttribute() should work. I found this workaround, which seems to work in all browsers:
var newUrl = 'http://example.com';
var objectEl = document.getElementById('contentarea');
objectEl.outerHTML = objectEl.outerHTML.replace(/data="(.+?)"/, 'data="' + newUrl + '"');
The above solutions did not work properly in Firefox, the Object tag doesn't refresh for some reason. My object tags show SVG images.
My working solution for this was to replace the complete Object node with a clone:
var object = document.getElementById(objectID);
object.setAttribute('data', newData);
var clone = object.cloneNode(true);
var parent = object.parentNode;
parent.removeChild(object );
parent.appendChild(clone );
Here's how I finally achieved it. You can do
document.getElementById("contentarea").object.location.href = url;
or maybe
document.getElementById("contentarea").object.parentWindow.navigate(url);
The Object element also has a 'readyState' property which can be used to check whether the contained page is 'loading' or 'complete'.
I found a very simple solution that also works in Chrome. The trick is to make the object (or a parent element) invisible, change the data attribute, and then make the object visible again.
In the code below, it is assumed that object_element is the object element and parent_element is the parent, and url is the url of the data.
parent_element.style.display = 'none'; // workaround for Chrome
object_element.setAttribute('data', url);
parent_element.style.display = '';
Following user2802253, I use this one on Safari and Firefox, which also forces a redraw. (sorry, not enough reputation to post as a simple comment).
theObject.style.visibility = null;
theObject.setAttribute("data", url);
theObject.style.visibility = "visible";
var obj = document.getElementById("pdfDoc");
obj.setAttribute('data', newPdf);
worked on Chrome version 54 and Safari, but didn't work on IE 11
what worked on them all
var obj = document.getElementById("pdfDoc");
obj.setAttribute('data', newPdf);
var cl = obj.cloneNode(true);
var parent = obj.parentNode;
parent.removeChild(obj);
parent.appendChild(cl);
This snippet did the job in my case
var object = document.getElementById(objectID);
object.setAttribute('data', newData);
var clone = object.cloneNode(true);
var parent = object.parentNode;
parent.removeChild(object );
parent.appendChild(clone );
<div id='myob'>
<object style="border: none;" standby="loading" id="contentarea"
width="100%" height="53%" type="text/html" data="test1.html"></object>
</div>
$('#myob').html($('#myob').html());
Changing the data attribute should be easy. However, it may not work perfectly on all browsers.
If the content is always HTML why not use an iframe?
Antoher way of doing it, you could embed the object in a DIV
var newUrl = 'http://example.com';
var divEl = document.getElementById('divID');
var objEl = document.getElementById('objID');
objEl.data = newUrl;
// Refresh the content
divEl.innerHTML = divEl.innerHTML;
I think this is a better way to achieve your objective.
Html:
<div id="mytemplate"><div>
Js:
function changeTemplate(t){
var mytemplate = document.getElementById("mytemplate");
mytemplate.innerHTML = '<object type="text/html" data=' + t + '></object>';
}
changeTemplate('template.html');
changeTemplate('whatever.html');
var content_area = document.getElementById("contentarea");
content_area.data = newUrl;
Refreshes object in Chrome Version 42.0.2311.90 m
the main reason of this issue is using "/" in local files.
The Wrong Code :
var obj = document.getElementById("hostedhtml");
obj.setAttribute('data', "pages\page2.html");
The Right Code :
var obj = document.getElementById("hostedhtml");
obj.setAttribute('data', "pages\\page2.html");

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