Here's a very basic question: why is the finishLoading() function in the code below not able to access the 'opacity' property for the #myStyle CSS selector? The alert doesn't display anything, and I've verified that the 'opacity' property is 'false'.
Thanks very much!
<html>
<head>
<style type="text/css">
<!--
#myStyle
{
opacity: 0.50;
}
-->
</style>
<script type="text/javascript">
<!--
function finishedLoading()
{
alert(document.getElementById('myStyle').style.opacity);
}
-->
</script>
</head>
<body onload="finishedLoading();">
<div id="myStyle">
hello
</div>
</body>
</html>
You can get the values set through class only after their computation.
var oElm = document.getElementById ( "myStyle" );
var strValue = "";
if(document.defaultView && document.defaultView.getComputedStyle)
{
strValue = document.defaultView.getComputedStyle(oElm, null).getPropertyValue("-moz-opacity");
}
else if(oElm.currentStyle) // For IE
{
strValue = oElm.currentStyle["opacity"];
}
alert ( strValue );
The problem is, that element.style.opacity only stores values, that are set inside the element's style attribute. If you want to access style values, that come from other stylesheets, take a look at quirksmode.
Cheers,
I suggest you take a look at jQuery and some of the posts at Learning jQuery, it will make doing things like this very easy.
Opacity should be a number rather than a boolean. Is it working in any other browseR?
this link help
http://www.quirksmode.org/js/opacity.html
function setOpacity(value) {
testObj.style.opacity = value/10;
testObj.style.filter = 'alpha(opacity=' + value*10 + ')';
}
opacity is for Mozilla and Safari, filter for Explorer. value ranges from 0 to 10.
Related
some issue with google chrome, center image must be on top, but they don't.
Please try following code to repeat this issue:
<!DOCTYPE html>
<html>
<head>
<script>
function big_image(myelem) {
myelem.style.webkitTransform = 'scale(2.0)';
myelem.style.zIndex = '99';
}
function orig_image(myelem) {
myelem.style.webkitTransform = 'scale(1.0)';
myelem.style.zIndex = 'auto';
}
</script>
</head>
<body>
<img src="http://www.pewforum.org/files/2015/10/PF_15.10.05_PostPapal_promo260x260.jpg" onmouseover="big_image(this);" onmouseout="orig_image(this);">
<img src="http://www.pewforum.org/files/2015/10/PF_15.10.05_PostPapal_promo260x260.jpg" onmouseover="big_image(this);" onmouseout="orig_image(this);">
<img src="http://www.pewforum.org/files/2015/10/PF_15.10.05_PostPapal_promo260x260.jpg" onmouseover="big_image(this);" onmouseout="orig_image(this);">
</body>
</html>
How to fix / overcome it?
Thanks.
There is a bug to do with z-index and transform properties.
The best way to avoid it, will be to reset transform property onmouseout:
function big_image(myelem) {
myelem.style.webkitTransform = 'scale(2.0)';
myelem.style.zIndex = '2';
}
function orig_image(myelem) {
myelem.style.webkitTransform = 'none';
myelem.style.zIndex = '1';
}
Tested and works as expected on Chrome/Opera.
I am simply trying to hide a select list/drop down list on an html page. I am not trying to hide the options in the select list, just the select list overall. I am having the hardest time for some unknown reason. I cannot figure out how to do this.
HTML
<HTML>
<head>
<title>Test</title>
<script type="text/javascript">
var myVal = 10;
if (myVal = 10) {
document.getElementById("contracts").style.visibility="hidden";
}
</script
</head>
<body>
<select id="contracts" name ="contracts" style="width:99%;height:50px"></select>
</body>
</html>
As simpel as can be, yet I cannot figure out how to hide the select list. It's still present on my page. This example is actually hiding the values in my select list but not the overall select list. Does anyone know how to accomplish this? I am out of ideas. Thanks in advance for your help.
document.getElementById('contracts').style.display = 'none';
The above should do
You man consider using jQuery though. Makes your life simple
$('#contracts').hide();
That's all
Cheers
try and move the script to the bottom of the page. It's executing before the element is loaded. You could also put it in the "onload" function
window.onload = function(){
var myVal = 10;
if (myVal = 10) {
document.getElementById("contracts").style.visibility="hidden";
}
};
Instead of visibility, you should be looking at display property. Check the snippet below.
<HTML>
<head>
<title>Test</title>
</head>
<body>
<select id="contracts" name ="contracts" style="width:99%;height:50px"></select>
</body>
<script type="text/javascript">
var myVal = 10;
if (myVal = 10) {
document.getElementById("contracts").style.display="none";
}
</script
</html>
Given the code :
<html>
<head>
<script src="jquery-2.1.0.min.js"></script>
Something...
</head>
<button id='flip' type='button'>Flip</button>
<script>
$('#flip').bind('click', function() {
var x = document.getElementById("flip").name;
if (x == 'Flip')
{
$(this).text('Flop');
}
else
{
$(this).text('Flip');
}
});
</script>
</body>
</html>
I'm trying to change the button each time it is clicked , but it doesn't work .
Any idea how to fix it ?
Much appreciated
There is no name attribute on your <button>, so you'll always get empty value. No need for document.getElementById because button is in this. Simply call text() without parameters to get current value:
var x = $(this).text();
Update
Here is demo in JsFiddler.
I would do something like this:
HTML:
<button id="flipflop">flip</button>
javascript:
var flip = true;
$("#flipflop").click(function(){
if(flip)
$("#flipflop").text("flop");
else
$("#flipflop").text("flip");
flip = !flip;
})
FIDDLE
edit: if you want to be really savvy, I would use the following line:
var flip = ($("#flipflop").text() === "flip");
Which automatically determines which way you need to flip (or is it flop?).
All that I have read says to use the element.onclick property, but that doesn't seem to be working in my situation. I'm trying to parse the number: 629216818 and set it to a varialbe: fbid. This is a Greasemonkey script, so the HTML can't be edited directly. I'm no pro, so I may be just doing something stupid, but here is my HTML and Javascript:
<div id="petRightContainer">
<a title = "Pet trainer bonus: Your companion will level 5% faster." href="setup.php?type=companion>Random=8167343321487308">
<div class="petRight" style="background-image:url(/fb/res/gui4/companion/cu_sith.jpg)"></div>
</a>
<div class="petRightLevel">
Dog
</div>
etc.
<script type="text/javascript">
fbid = 0;
fbidRegex = /\d{3,}(?=&fromWall=1)/;
if ( document.getElementsByClassName("petRightLevel")[0]){
element = document.getElementsByClassName("petRightLevel")[0].firstChild;
codeStore = element.onclick;
fbid = fbidRegex.exec(codeStore);
document.write("it is working ");
}
document.write(fbid);
</script>
The problem is in this line:
element = document.getElementsByClassName("petRightLevel")[0].firstChild;
If you are using Firefox and other browsers which support document.getElementsByClassName and in your HTML, there are spaces between <div class="petRightLevel"> and
<a href="#" onClick= ...>
, the firstChild is actually a text node not the link. All you need to do is remove the spaces and/or line break in between the two elements.
If you are using IE, the problem is still at the same line of the javascript because IE doesn't support document.getElementsByClassName up until version 8.
Update: The following javascript code work for all the browsers I tested without touching HTML:
<script type="text/javascript">
fbid = 0;
fbidRegex = /\d{3,}(?=&fromWall=1)/;
var divs = document.getElementsByTagName("div");
var link = null;
for (var i=0;i<divs.length;i++)
{
if(divs[i].getAttribute("class") ==="petRightLevel")
{
link = divs[i].getElementsByTagName("a")[0];
break;
}
}
if (link){
codeStore = link.onclick;
fbid = fbidRegex.exec(codeStore);
document.write("it is working ");
}
document.write(fbid);
</script>
If you only need to get the anchors, it would be much simpler than this.
I think this might work for you.
<script type="text/javascript">
fbid = 0;
fbidRegex = /\d{3,}(?=&fromWall=1)/;
if(document.getElementsByClassName("petRightLevel")[0]){
element = document.getElementsByClassName("petRightLevel")[0].firstChild;
// callback function to execute when the element onclick event occurs.
codeStore = element.onclick = function(){
fbid = fbidRegex.exec(codeStore);
document.write("it is working ");
document.write(fbid);
}
}
</script>
This question already has answers here:
setAttribute is not working for 'style' attribute on IE
(6 answers)
Closed 9 years ago.
document.getElementById(...).setAttribute('style',... is not working in Internet Explorer 7.0. How can I make this work in Internet Explorer?
<!DOCTYPE html>
<html lang="en">
<head>
<script type="text/javascript">
var myarray=new Array(3);
for (i=0; i <1000; i++){
myarray[i]=new Array(3);
}
myarray[0][0]="new"; myarray[0][1]="old";
function swapText(id){
document.getElementById('id' + id).setAttribute('style', 'font-weight: bold; color: red; font-size:150%;');
document.getElementById('id'+ id).innerHTML = myarray[id][0];
}
function originalText(id){
document.getElementById('id' + id).setAttribute('style', 'color:' + 'black' + ';');
document.getElementById('id' + id).innerHTML = myarray[id][1];
}
</script>
</head>
<body>
<div id="scoreboard" border='1'> </div>
<div id="qa">
<div id="col1" class="column">
<div id="id0" onmouseover="swapText(0)"; onmouseout="originalText(0)">old</div>
</div>
</div>
</body>
</html>
Using setAttribute is unreliable if you want the change to be reflected in the document. Use Element.style instead:
var el = document.getElementById('id' + id);
el.style.fontWeight = 'bold';
el.style.color = 'red';
el.style.fontSize = '150%';
and suchlike.
Use jQuery.
jQuery is a very powerful JavaScript library that lets you do almost anything with very little code. One of its main advantages (except for its beautiful syntax) is that it is specifically designed to be platform- and browser-independent, so you shouldn't have to worry about any of that anymore.
Doing the same thing you do now, but in jQuery, could look something like this:
function swapText(id) {
$('#id' + id)
.css('font-weight','bold').css('color','red').css('font-size','150%')
.html(myarray[id][0]);
}
function originalText(id) {
$('#id' + id).css('color','black').html(myarray[id][1]);
}
Of course, if you define a CSS class for your "swapped" style, you could simply use $('#id'+id).addClass('swapped'); and $('#id'+id).removeClass('swapped');.
Also, there are really nice ways to hook up events, so you don't even need to define the functions with names if you don't want to:
$('div').hover(function() {
$(this)
.css('font-weight','bold').css('color','red').css('font-size','150%')
.html(myarray[id][0]);
},
function() {
$('#id' + id).css('color','black').html(myarray[id][1]);
});
From MSDN: This attribute is not accessible through scripting. To access styles through scripting, use the style object
you can use setAttribute that is also compatible with IE-8 and IE-7
var el = document.getElementById('id' + id);
el.setAttribute('fontWeight','bold');
el.setAttribute('color','red');
el.setAttribute('fontSize','150%');
for assigning a class to an element, i suggest following
el.className = "class-name";