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JavaScript - Preventing Browser From Allowing Image Drag
Hello All,
How can I prevent a browser from letting an image drag. I've tried this snippet: Code: document.onmousemove = function() {return false};
Thanks in advance! Similar TutorialsHi there, I am trying to come out with a Cross-Browser JavaScript codes to drag & drop some pictures. It seems to work well in IE, but when I tried it in Non-IE type of browsers (Safari, Chrome, Firefox), it did not come out that good... I would be very happy if anyone can enlighten me on the reasons why the script misbehave in Non-IEs. To try, you need to create a not-too-big-sized jpeg image and name it "x.jpg". Many thanks ! Chris ================================= <html> <head> <style> .drag{position:relative;cursor:hand} </style> <script language="JavaScript1.2"> var dragapproved=false var z,x,y var temp1, temp2; // ------------------------------------------------------------------------- function MouseEvent(e) { // Class used to standardize Cross-Browser event object. if (!e) { e = window.event; // IE this.target = e.srcElement; this.button = e.button; this.X = e.clientX; this.Y = e.clientY; } else { // Non-IE this.target = e.target; this.button = e.button; this.X = e.pageX; this.Y = e.pageY; } } // ------------------------------------------------------------------------- function move(e) { var e = new MouseEvent(e); if (e.button <= 1 && dragapproved) { z.pixelLeft = temp1 + e.X - x; z.pixelTop = temp2 + e.Y - y; return false } } // ------------------------------------------------------------------------- function startDrag(e) { var e = new MouseEvent(e); if (e.target.className=="drag") { dragapproved=true; z=e.target.style; temp1=z.pixelLeft; temp2=z.pixelTop; x=e.X; y=e.Y; document.onmousemove=move; } } // ------------------------------------------------------------------------- function stopDrag() { dragapproved = false; } // ------------------------------------------------------------------------- document.onmousedown=startDrag document.onmouseup=stopDrag </script> </head> <!-- ========================================================================== --> <body> <img src="x.jpg" class="drag"><br> </body> </html> hi, i want to drag the div which have a image in it: but i find that if i click on the image, i cannot drag the div, (in FF3.5) any advice would be appreciated. Code: <div id="div1"> <imc src="XXX.jpg"> </div> and i have a JS something like that...: Code: drag();
function drag(){
document.onmousedown = startdrag;
document.onmouseup = enddrag;
}
function startdrag(e){
dragobj=e.target;
alert(dragobj.id);
}
......................
Hi all, I hope you are able to help me out. I have a a page (see code below, I have compressed it to 2 images) where I want to let the user drag and drop images to anywhere on the page (I have achieved this.) What I want to be able to do is allow the user to dock 2 images together. In the example below the 2 images are horizontal lines. What I want the user to be able to do is move the images together and dock them so that they form one horizontal line. When the user moves one of the pictures both will move and stay docked. my initial idea was that when the user selects "dock" I somehow move both images into a div and make the div dragable, that way both images move together. Then if the user selects "undock" both images are removed from the div and become draggable again. I hope this makes sense. Can anyone help? [CODE] <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>drag, Drop and dock</title> <style type="text/css"> .drag { border: 1px solid black; background-color: rgb(240, 240, 240); position: relative; padding: 0.5em; margin: 0 0 0.5em 1.5em; cursor: move; } </style> <script language="JavaScript" type="text/javascript"> <!-- // this is simply a shortcut for the eyes and fingers function $(id) { return document.getElementById(id); } var _startX = 0; // mouse starting positions var _startY = 0; var _offsetX = 0; // current element offset var _offsetY = 0; var _dragElement; // needs to be passed from OnMouseDown to OnMouseMove var _oldZIndex = 0; // we temporarily increase the z-index during drag InitDragDrop(); function InitDragDrop() { document.onmousedown = OnMouseDown; document.onmouseup = OnMouseUp; } function OnMouseDown(e) { // IE is retarded and doesn't pass the event object if (e == null) e = window.event; // IE uses srcElement, others use target var target = e.target != null ? e.target : e.srcElement; // for IE, left click == 1 // for Firefox, left click == 0 if ((e.button == 1 && window.event != null || e.button == 0) && target.className == 'drag') { // grab the mouse position _startX = e.clientX; _startY = e.clientY; // grab the clicked element's position _offsetX = ExtractNumber(target.style.left); _offsetY = ExtractNumber(target.style.top); // bring the clicked element to the front while it is being dragged _oldZIndex = target.style.zIndex; target.style.zIndex = 10000; // we need to access the element in OnMouseMove _dragElement = target; // tell our code to start moving the element with the mouse document.onmousemove = OnMouseMove; // cancel out any text selections document.body.focus(); // prevent text selection in IE document.onselectstart = function () { return false; }; // prevent IE from trying to drag an image target.ondragstart = function() { return false; }; // prevent text selection (except IE) return false; } } function ExtractNumber(value) { var n = parseInt(value); return n == null || isNaN(n) ? 0 : n; } function OnMouseMove(e) { if (e == null) var e = window.event; // this is the actual "drag code" _dragElement.style.left = (_offsetX + e.clientX - _startX) + 'px'; _dragElement.style.top = (_offsetY + e.clientY - _startY) + 'px'; } function OnMouseUp(e) { if (_dragElement != null) { _dragElement.style.zIndex = _oldZIndex; // we're done with these events until the next OnMouseDown document.onmousemove = null; document.onselectstart = null; _dragElement.ondragstart = null; // this is how we know we're not dragging _dragElement = null; } } //--> </script> </head> <body> <img class="drag" src="Horizontal_Line.png" alt="A horizontal line" /> <img class="drag" src="Horizontal_Line.png" alt="Another horizontal line" /> </body> </html> [CODE] Hi, I am new here, I am trying to find solution for one problem with my new web page, I want to use amazing effect -by mouse draging or swipe on the certain image which should launch animation effect (something like image rotating) -set of images should run dynamicaly and so simulate fluid effect (movie). For a better Idea what I need it can be for example something as physical lever switch with spring when this switch is slightly tilted spring complete this action and switch is flipped to other state. Or another example image of book should be on web and when someone drag and pull page this should independently continue and complete action - turn to new page. So my question .. is something like that possible with javascript if yes can You please point me where I have look or how this can be done, each advice will be valuable for me or maybe javascript isnt right choice for this can You advise me? THANKS Hello, I am working on a page that has a jQuery full browser BG image and I am trying to also utilize a MooTools gallery. There seems to be some interference between the two JavaScripts as only one works (whichever one is last in order in the header of the HTML document). Links: http://www.courtneyhunt.com.au/press_bg.html http://www.courtneyhunt.com.au/press_gallery.html I am a complete novice with JavaScript so if anyone could help that would be great. Thank you in advance. Hi, So here is my problem. I have a main image that has a bunch of images (e.g., stars) on top. I place the stars in absolute positions on top of the main image. If a user resizes the brower, then the position of the main image changes, so then the stars are off position (not on top of the main image). Should I: 1) make the main image be in an absolute position? or 2) do something else such that the main image moves around if the browser is resized? but then I don't know how to re-adjust the positions of the stars on the fly. is there js to prevent malicious clickers who try to ban my site from google ads by clicking so many times?
If a negative number is entered into the reading variable it should be displayed as a zero. This works with the first calculations such as average but right at they very end the the alert wont display the highest average it just displays the one which has a negative number typed in to it. Code: var region=0
var reading=0
var average=0
var count=0
var readingSum=0
var catergory=0
var dry=0
var normal=0
var wet=0
var countWet=0
var countNormal=0
var countDry=0
var totalLoop=0
var numLocations=0
var maxAverage=0
var maxRegion=0
var maxReadings=0
var totalReadings=0
// ** Find out how many locations ** //
numLocations=eval(prompt("How many locations are you taking readings for?"));
// ** Loop for multiple entries ** //
for(totalLoop=1; totalLoop<=numLocations; totalLoop=totalLoop+1)
{
// ** Reset total for loop ** //
readingSum=0
// ** Get Region ** //
region = prompt("Enter region please");
// ** Get Readings ** //
totalReadings = eval(prompt("Enter readings please"));
// ** Get readings and Prevent negative number ** //
if(totalReadings<=0)
{
alert("Please enter valid reading")
}
else
{
alert("You entered " + totalReadings);
}
// ** Ask for indivdual readings ** //
for(count=1; count<=totalReadings; count=count+1)
{
reading=eval(prompt("Enter reading please"));
// ** Prevent negative number ** //
if(reading<0)
{
reading=0
alert("Please enter valid reading")
}
// ** Work out Total of readings ** //
readingSum= readingSum + reading
}
// ** Work out average ** //
average= readingSum/totalReadings
// ** Put average into a category and display everything ** //
if(average<5)
{
catergory="dry"
countDry=countDry+1
}
else if(average>=5 && average<20)
{
catergory="normal"
countNormal= countNormal+1
}
else if(average>20)
{
catergory="wet"
countWet=countWet+1
}
alert("Location is " + region + "\nNumber of weakly readings taken is " + totalReadings + "\nTotal of readings is " + readingSum + "\nAverage is " + average + "\nLocation is " + catergory);
// ** Find Highest average ** //
if((average>maxAverage) || (totalReadings>maxReadings))
{
maxAverage=average
maxRegion=region
}
}
// ** Final Report ** //
alert("Number of locations is " + numLocations + "\nDry is " + countDry + "\nNormal is " + countNormal + "\nWet is " + countWet + "\nLocation with highest average reading is " + maxRegion + "\nHighest average is " + maxAverage);
Do i need a while loop? i am only allowed to use while, for and if statements Hi, I'm a retired social worker with beginner skills in scripting a web page and need some suggestions. I create eLearning materials which are given away as a communty service to help people improve their health. A typical eLearning project has a few educational screens (using a Learner Management System-LMS-template) and an interactive exercise (on an external web page-htm or html-usually accessed by button which navigates to the exercise's URL). The interactive exercise should only be accessed from inside the eLearning lesson using the button, because it requires understanding of the way it works plus important cautions to assure proper use. I need to prevent the use of the URL outside of taking the lesson (for example, someone taking the lesson acquires the exercise's URL from their browser history and then may give this to others who access the exercise directly-without necessary knowledge and cautions). I tried document.referrer, using JavaScript. Using the referrer URL from inside the lesson and adding the JavaScript to the exercise's htm code worked OK in FF, but not in IE 8. In FF, if the referrer was not the correct single URL from inside the lesson, then it redirected; if the correct URL, the exercise appears. The JS code follows: Code: <script language="JavaScript" type="text/javascript">
<!--
var oksite = "http://www.mysite.com/xyz/courseidxxxxx/yyyy/zzz.html";
var redirect = "http://mysite.com/error.html";
if (document.referrer != oksite)
{
location.replace(redirect);
}
//-->
</script>
In IE 8, I was not able to get it to work. Using an alert, I noticed that the referrer in IE 8 was blank. My web hosting (GoDaddy) is a shared Windows hosting. I would have to upgrade from IIS6 to IIS7 to use PHP. Bigger challenge: I've never used PHP. If possible, I would prefer to use JS. But, I am open to any suggestion that will help. I am also wondering if part of the IE 8 issue is that I am using IE 8 X 64? I'm stuck and hope someone can suggest a way to solve this access issue. Thanks for your help. Kind Regards, saratogacoach Please follow these steps in the jsfiddle 1. Click on open grid link and select option "3", buttons A,B and C would appear 2. Enter in number 2 in the number of Answers textbox. Then select buttons A and C 3. Now click on the open grid again and select option 6. 4. Now the number of Answers textbox is empty so type in 2 again in the text-box. So only 2 answers should be selected which is A and C. So if you click on another button the alert message should appear stating you are beyond limit, deselect another button. But this does not happen. Instead the user can select another 2 buttons and then the alert message would appear if another button is selected. This means that 4 buttons are selected which is incorrect, it should still be 2. So does anyone have an idea why it is doing this? Thanks Code is in jsfiddle, click [here][1] [1]: http://jsfiddle.net/C7vcQ/2/ Hey guys, I have a colour picker on my site, see it at http://www.ludatha.com Now I want to change the colour of the links on the page, don't worry I know how to do all this. It's just if someone chooses full black (#000000) the theme looks awesome, but the links on the dark background are invisible. Similarly if someone chooses full white (#ffffff) then you can't see the text on the white background. So I want to know if you geniuses can make it so when a variable containing a hex, like #000000 is set as the main colour, then the link colour is changed to #666666 so you can still see it, but I want it to work with colours, so if you had #360000 (dark red) then the link colour would be something like #a10000. I know this is possible, somehow... I hope I have explained it well enough for you to understand, here is my code to change the background: Code: onChange: function (hsb, hex, rgb) {
$('.colour-picker-colour').css('backgroundColor', '#' + hex);
$('.background').css('backgroundColor', '#' + hex);
$('.colour').css('backgroundColor', '#' + hex);
$('.colour-text').css('color', '#' + hex);
$('a .colour-text').css('color', '#' + hex);
$('.colour-text-hover:hover').css('color', '#' + hex);
$('.tabs a:hover').css('color', '#' + hex);
$('.seperator').css('backgroundColor', '#' + hex);
$.cookie('ludatha_colour', hex, { expires: 365 });
}
P.S. My site may not look right for a few hours as the images and CSS is updating. How can I go about making it so JavaScript will not let a form submit unless a number entered into a field matches a pre-specified number? A guess.. Code: function validateForm() {
if (document.forms["form"]["number"].value=="123") {
submit} else {alert ("Cant submit because the number doesn't match.");
return false;
}
}
I'm trying to create a modulus function that will redirect users who input certain values to a secondary page. I've searched google and found a way to validate when users input a multiple of x, but I need to take it one step further and only allow values within a certain range. In full, I need to validate multiples of 7 starting at 7007 and ending on 15673 (so validate on 7007, 7014, 7021, etc.). Right now I'm looking at this code: Code: $(document).ready(function(){
$(".sub").click(function(){
if (!(($(".txt").val() % 7 == 0) || ($(".txt").val()==1)))
{
alert("Not interval of 7 or value of 1");
}
else {
alert("Interval of 7 or value of 1!");
}
});
});
Which I found here. I also need to remove the "value of 1". I'm new to JS, so when I tried, I broke the code. Any help would be much appreciated. Thank you! I have an onfocus event that makes a textarea large and then an onblur event that sets it back to a smaller textarea. If I click the textarea the onfocus event is triggered but if I go straight to submit the form the onblur event is triggered and the form is not submitted unless i hit submit twice. How can i get the form to submit? Can i put an "if" statement in the onblur event to see if the form is being submitted then just submit the form otherwise run the onblur event? Code: <style type="text/css">
.textarea {
background-color: #ffffff;
color: black;
font-family: Arial, sans-serif;
font-size: 8pt;
font-weight: normal;
border-style: solid;
border-width: 1px;
border-color: aaaaaa;
height: 18px;
width: 50%;
overflow: hidden;
}
.textarea2 {
background-color: #ffffff;
color: black;
font-family: Arial, sans-serif;
font-size: 8pt;
font-weight: normal;
border-style: solid;
border-width: 1px;
border-color: aaaaaa;
height: 100px;
width: 50%;
overflow: auto;
}
</style>
</head>
<body>
<script>
function enlargeBox(v,n,c){
document.theForm.elements[n].className='textarea2';
}
</script>
<form method="POST" name="theForm" action="newProcess.php">
site<br>
<textarea
class = "textarea"
name = "site"
onblur = "this.className='textarea'"
onfocus = 'enlargeBox(this.value,this.name,this.className)' rows="1" cols="20"> this is a test for this new texfield to textareathis is a test for this new texfield to textareathis is a test for this new texfield to textareathis is a test for this new texfield to textareathis is a test for this new texfield to textareathis is a test for this new texfield to textareathis is a test for this new texfield to textarea</textarea>
<br>
Contact:<br>
<input type="text" onclick="this.select();" name="contact" value="" class="textfieldlp" size="50">
<p> </p>
<p><input type="submit" value="submit" name="B1"></p>
</form>
Someone please point me in the right direction. Basically what i'm trying to do is, Post up a nice image map up top of a page with several diff images (all same dimensions), and when the user clicks on one of the images, it loads down in a section below, without reloading the page. I have drawn a small diagram to show you guys what i'm talking about. So far, all I've found, are scripts that use some sort of lightbox that covers the entire page. I would like to try to stay away from flash if I can. The main browser, does'nt necessarily have to be one big image with a map, but it would make it look so much better if it looked matched the games menu. I'm trying to replicate a stats game menu, inside my webpage, so ppl can browse just like they do in game. Example: What I'm trying to replicate: When a weapon on this menu is clicked, it loads up on the right, and gives a brief description. I"m just trying to replicate the functionality of this menu really. So are there any kind of scripts out there that already exist, where I could accomplish this? or how would i go about this. just need someone to point me in the right direction. Thanks a million Hi, i feel kinda stupid asking this, but im kinda lost. I want to add up multiple values of groups of checkboxes. I managed to add up the values, but making it so that only one checkbox per group can be enabled at any time gives me a headache. Here is what i got so far, any hints to how to make it work would be really cool. Code: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=windows-1250">
<meta name="generator" content="PSPad editor, www.pspad.com">
<title></title>
</head>
<body>
<script type="text/javascript">
function Summe()
{
sum = 0;
if(document.Formular.m1.checked)
{
sum = sum + (1 * document.Formular.m1.value);
}
if(document.Formular.m2.checked)
{
sum = sum + (1 * document.Formular.m2.value);
}
if(document.Formular.m3.checked)
{
sum = sum + (1 * document.Formular.m3.value);
}
if(document.Formular.m4.checked)
{
sum = sum + (1 * document.Formular.m4.value);
}
if(document.Formular.m5.checked)
{
sum = sum + (1 * document.Formular.m5.value);
}
if(document.Formular.m6.checked)
{
sum = sum + (1 * document.Formular.m6.value);
}
if(document.Formular.m7.checked)
{
sum = sum + (1 * document.Formular.m7.value);
}
if(document.Formular.m8.checked)
{
sum = sum + (1 * document.Formular.m8.value);
}
document.Formular.black.value = sum;
}
</script>
<form name="Formular">
<INPUT TYPE="TEXTBOX" NAME="black" VALUE="" SIZE="3"> <br>
grp1<br>
<input type="checkbox" Name="m1" Value="411" id="411" onClick="javascript:Summe()"> <br>
<input type="checkbox" Name="m2" Value="412" id="412" onClick="javascript:Summe()"> <br><br>
grp2<br>
<input type="checkbox" Name="m3" Value="421" id="421"onClick="javascript:Summe()"> <br>
<input type="checkbox" Name="m4" Value="422" id="422"onClick="javascript:Summe()"> <br>
<input type="checkbox" Name="m5" Value="423" id="423" onClick="javascript:Summe()"> <br> <br>
grp3 <br>
<input type="checkbox" Name="m6" Value="431" id="431" onClick="javascript:Summe()"> <br>
<input type="checkbox" Name="m7" Value="432" id="432" onClick="javascript:Summe()"> <br>
<input type="checkbox" Name="m8" Value="433" id="433" onClick="javascript:Summe()"> <br> <br>
</form>
</body>
</html>
Basically, i have an image that i want it to be resized when i maximize and change browser size, so it is always centered. I have to use only javascript. I tried many window.resize functions but nothing works. Lets say the image is called 0000.jpg. Anyone has any ideas how to make this? Thank you in advance. Just curious if anyone has a crossbrowser version of the Popup Image Viewer script that's in the Post a JavaScript section. Seems that all of the ones in there (original and modifications) are browser specific, whereas I need something that will work for all browsers, or at least IE and firefox.
My question is twofold. First, is there a way to have a javascript file display an externally hosted image when opened with a browser? I mean such a way where the URL of the javascript file can be referenced by an html document and display an image? Furthermore, is there a way to have this be a different image depending on the time of day and timezone of the user, specifically one image in the morning and a different image in the evening? I apologize if I posted this in the wrong section, but I wasn't sure where else this could go. |
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