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JavaScript - Enable Link/button When User Scrolls To Bottom Of Page (or Element)
I've been handed an html document that contains a centered, scrollable <iframe> element with a static height and width. This iframe element displays a simple html document that houses the 'terms of service' text.
Their goal is to have it to where the <a href> link at the bottom that is shown to the user as 'next' is disabled until the user scrolls to the bottom of the terms of agreement box. The clickable link could be a button, image or text (no preference). They have to have it this way for legal reasons and radio buttons or checkboxes will not suffice unfortunately. Question: What is the best way to go about doing this that seems to be cross-browser friendly (especially IE7). I offer $10 via paypal for well commented method/script. Similar TutorialsHi, Can anyone please tell me that " how to write a JavaScript function to pop up an alert() if a user scrolls down the webpage faster than a certain speed" Looking forward for a urgent reply Thanks I already asked that question on Stack Overflow, however so far I haven't gotten any answers there, so I thought maybe somebody here could help me. Below is the question, copied from Stack Overflow. I've got this problem that I've been trying to solve for a week and I'm at wit's end (which, well, most likely means my wit's not so great, since it doesn't seem to be a very hard problem; nonetheless I'm very new to Javascript and am trying to look at this as a learning experience). I wanted to have a fixed position element that would rotate as a user scrolls the page. Doing so in CSS is trivially easy, however it doesn't work all that great, especially across browsers (works fine in Chrome, but is janky in Firefox) and under stress (when I turn on FPS meter or some other stuff in Chrome Developer Tools it stops working correctly ― I assume it would also behave similarly if there was another CPU-extensive app open etc.). So I figured that animating in the canvas would be a more stable technique. Doing the basic animation in the canvas is, again, rather easy. However I started having problems while trying to emulate the CSS transition effect. In short, I'm trying to emulate a code like this: Code: <!DOCTYPE html>
<html>
<head>
<title>Page Title</title>
<style>
body {
height: 3000px;
}
#square {
margin: 50px;
width: 150px;
height: 150px;
position: fixed;
background-color: black;
transition: transform linear 0.3s;
}
</style>
<script>
window.onload = function() {
var deg = 0;
var pos = window.pageYOffset;
var square = document.getElementById('square');
window.onscroll = function() {
var npos = window.pageYOffset;
deg += (npos - pos) / 10;
pos = npos;
square.style.transform = 'rotate(' + deg + 'deg)';
}
}
</script>
</head>
<body>
<div id='square'></div>
</body>
</html>
And what I've got currently is below. This is, like, fifteenth try, and if you run it, you'll see that it kind of works but is very ugly and totally not how it should look. I have had better results before, but still not what I was looking for. Code: <!DOCTYPE html>
<html>
<head>
<title>Page Title</title>
<style>
body {
height: 3000px;
}
canvas {
position: fixed;
}
</style>
</head>
<body>
<canvas id='canvas' width='250' height='250'></canvas>
<script>
window.onload = function() {
// some canvas geometry stuff
var canvas = document.getElementById('canvas');
var c = canvas.getContext('2d');
c.translate(125,125);
var deg = Math.PI / 180;
// initializing variables
var request = null;
var deg = 0;
var ndeg = 0;
var base_degree;
var pos = window.pageYOffset;
var time = 0;
var duration = 300; // in milliseconds
draw();
document.addEventListener('scroll', rotateStart, false);
function rotateStart() {
// at the beggining of the scroll, set the time variable and start the loop.
// if scroll continues, only set the time (thus resetting the animation),
// but don't call loop, since it's already set as a callback to requestAnimationFrame.
if (request == null) {
time = (new Date()).getTime();
loop();
}
else {
time = (new Date()).getTime();
}
}
function loop() {
// time passed as a fraction of total duration of animation. Describes our progress
var fraction = ((new Date()).getTime() - time) / duration;
if (fraction == 0) {
// if current time and old time are the same, skip this frame
request = window.requestAnimationFrame(loop);
}
else if (fraction < 1) {
base_degree = (window.pageYOffset - pos) / 10;
ndeg = deg + base_degree * fraction;
// we operate on ndeg, and preserve deg as a reference point
request = window.requestAnimationFrame(loop);
draw();
}
else {
// clean up code.
// we draw one last time at a definitive degree of rotation because
// in my experience with similar scripts it sometimes doesn't go all the way there,
// e.g. maybe it stops at fraction == 0.95 or something like that.
ndeg = deg + base_degree;
draw();
deg = ndeg;
pos = window.pageYOffset;
request = null;
}
}
function draw() {
c.save();
c.clearRect(-125,-125,250,250);
c.rotate(ndeg * deg);
c.fillRect(-75,-75,150,150);
c.restore();
}
};
</script>
</body>
</html>
Could somebody point out errors in what I'm doing, post a solution, give a hint as to what method would be preferred here, whatever? Ok so im new to javascript and I have a button in an interface for an app. It's like drag and drop and i want this button to link you to a certain website searching for what the user types in the searchField1 box. The button is button16. Such as you type dogs into the text box and you click the google button among other search engines and it will redirect you to a google search doing a search for dogs. But how do I make this button search google and search for whats in searchField1. I would really appreciate the help. Im looking everywhere to learn this but just cant find it. If you could tell me how or send me a link to a tutorial that would be great. Thanks! Here is the code: I don't know where and what to add to do that. Please help. I am trying to make it so if a PHP session entity exists, then JavaScript will enable a button. I am having trouble getting this to work and wondering if anyone knows what I am doing wrong? Code: function purchaseEnable() {
if ($_SESSION['order']['paymentmethod']) {
document.getElementById("purchase").disabled = false;
}
}
Code: <INPUT disabled id="purchase" type="submit" value="PURCHASE"> Is there anyway to make a text area scroll down with the page? Code: <textarea name = "scrollBox" rows = "1" cols = "10">A B C D </textarea> Hi I have a form where I want to force users to accept terms and conditions before they can move on to the next page (submit form). Code: <input tabindex="2" name="agreement" id="agreement" type="checkbox" value="N" onchange="checkAgreement()" />
<label class="checking" for="agreement">I accept the <a tabindex="1" href="?page_id=292" title="read this before you continue" class="popmeup">terms and conditions</a>.</label>
<!-- the button to be enabled -->
<input tabindex="3" type="button" name="confirmer" value="Confirm" onclick="confirmOrder()" disabled="disabled" />
and the JS that works fine in Firefox. IE enables the button, but it still "looks" disabled, hence it is unlikely that anyone clicks it. Code: function checkAgreement()
{
if(document.order_form.agreement.checked)
{
document.order_form.confirmer.disabled = false;
//document.order_form.submit.disabled = false;
document.order_form.agreement0.value = "Y";
//for testing
//document.order_form.confirmer.value = document.order_form.agreement0.value;
}
else
{ document.order_form.confirmer.disabled = true;
//document.order_form.submit.disabled = true;
document.order_form.agreement0.value = "N";
//document.order_form.confirmer.value = document.order_form.agreement0.value;
}
}
any ideas? Hi, I have two buttons save and finish. I want to enable the button finish whenever I click the save button. page1.jsp. <script> InitialLoad() { document.getElementById('finish').disabled = true; } save(){ document.getElementById('finish').disabled = false; } </script> <html> <body onload= "InitialLoad()"> <input type="submit" name="finish" id=="finish" value="finish"> <input type="submit" name="save" value="save" onclick= save();> </body> </html> strutsconfig.xml <forward name="success" path="atre.dodUpgrade.show.page1"/> Using the above I can enable it temporarly. But whenever I call the forward page it on action class forward = mapping.findForward("success"); The Problem is page Refresh again and it shows disabled button for finish. what could be the solution for this? Thanks hello, i have this script that doesn't work exactly right yet. but i can't figure it out what i need to chance to let it work. in the script i want the button to be enabled when both text boxes are filled, atm when i fill in 1 it will already enable the button and thats exactly what i don't want. im quite a nooby in this so could some1 help me ? tyvm in advance code___________________ <html> </head> <script type="text/javascript"> function ButtonDisable1(text) { if (text.length > 0) document.getElementById("submit_button").disabled = false; else document.getElementById("submit_button").disabled = true; } </script> </head> <body> <input type="text" id="search_text" onchange="ButtonDisable1(this.value)"> <input type="text" id="search2_text" onchange="ButtonDisable1(this.value)"> <input type="submit" id="submit_button" value="Search" disabled="true"> </body> </html> So it took me forever but I finally found a floating menu that works with a horizontally scrolling page - but of course, there's still a little bug. View the page he http://uconn.kappaphilambda.org/sisters.shtml As you can see, the more you scroll right, the more the menu "compacts" itself, eventually disappearing altogether. Any ideas as to how to fix it? You can view the code & script codes by viewing the source of the page. Thanks in advance :] Hello, I have a script that enables a certain button when some conditions are met. I'm having an issue with it, so I made a simple script to get to the core of what I'm trying to do. This is the script that I'm using: Code: function disable()
{
document.form.button2.disabled='false';
}
Code: <form name="form"> <input type="button" name="button1" value="Enable Button 2" onclick="disable()" /> <input type="button" name="button2" value="Button 2" disabled="true" /></form> Basically when you press button 1, button 2 enables. If I reverse it (button 2 enabled by default, pressing button 1 enables it) it is fine. But for some reason this way round nothing happens when I press button 1. What am I doing wrong? I'm having trouble programming a radio button to enable a group of checkbox options. I want the group to be disabled unless the radio is selected. Can I use: Code: document.getElementById("").disabled=true/false
for a <div> section? Here's what I have so far. function: Code: function disableSection() {
if (document.forms.radio.checked)
document.getElementById("optionalinfo").disabled = false;
else
document.getELementById("optionalinfo").disabled = true;
}
HTML: Code: <input type="radio" name="additionalinfo" value="yes"/>Yes! Please sign me up for the following items:<br/> <div><blockquote><input id="optionalinfo" type="checkbox" name="additional" value="newsletter"/> I wish to receive <font color="ff69b4"><i>AMT</i></font>'s monthly E-Zine, <b>"Glorious Morning Muffins"</b>.</br> <input id="optionalinfo" type="checkbox" name="additional" value="Updates"/> I wish to receive <font color="ff69b4"><i>AMT</i></font> updates.</br> <input id="optionalinfo" type="checkbox" name="additional" value="future"/> Keep me posted about future offerings at <font color="ff69b4"><i>AMT</i></font>.<br/> <input id="optionalinfo" type="checkbox" name="additional" value="userRegister"/>I need to register to log in</blockquote></div> In addition to this, I would like the section to fade when disabled. Thanks for any help... again! This is my table which the user will see. When the user select a category, the table will show the result. Therefore the number of row of details that will be shown is uncertain. Over here i show 3 example. ------------------------- Edit | Name | Number | ------------------------- radbtn | John | 123456 | radbtn | MJ | 654321 | radbtn | JP | 443224 | I have a edit button. Once i click on it all my N amount of radio button will be enable. How can i do it? the problem is i have to hard code it [0] [1] [2], how can i change it to N? document.formname.btnname[0].disabled=false; thanks for helping anyone! Hi, I am having a problem with my script used to disable my submit button. I want the button to disable upon correct submission of the form, and the button to be kept enabled if the required fields are not filled in. I have the following code at the moment (which only does the first if statement). Code: SCRIPT CODE:
<script type="text/javascript" >
function validateForm()
{
var amount=document.forms["expenserecord"]["amount"].value;
var picker=document.forms["expenserecord"]["picker"].value;
var desc=document.forms["expenserecord"]["description"].value;
if (amount==null || amount=="" || picker==null || picker=="" || desc==null || desc=="") {
alert("All required fields must be filled out.");
document.getElementById("sub").disabled = false;
return false;
}
else {
document.getElementByID("sub").disabled = true;
}
}
</script>
BUTTON CODE:
<p><input type="submit" value="Submit" onClick="return validateForm()" id="sub"></p>
I thought this would have been fairly simple but it appears the onchange event isn't triggered when a hidden field is populated by other javascript without user input. I have a simple search box and autocomplete/suggestion ajax thingie going on. What I want to do is have my "Go" submit button disbled until AFTER a user has populated the hidden field "cid". A user populates this field automatically when they click on a suggested option from the ajax autocomplete doofer. Here's what I've tried at the moment but failed on. Code: <form action="index.php" method="GET" name="qsform" id="qsform">
<input type="hidden" name="p" id="p" value="compdetails" style="border:1px solid #000000;" />
<input type="text" name="quicksearch" id="quicksearch" value="Find Company" style="border:1px solid #000000;" onFocus="clearText(this)" onBlur="clearText(this)" />
<input type="hidden" name="cid" id="cid" value="" style="border:1px solid #000000;" />
<input type="submit" name="go" id="go" value="Go" disabled="true" onmouseover="if (document.qsform.cid.value!='') { document.qsform.go.disabled=false; }" />
</form>
Hi, I'm relativly new to JS and brand new to the forum so you might need to dumb down your replys for my slightly lacking knowledge. That being said I do have a very solid grasp of html, css and am getting there with JS and its various frameworks. I'm integrating wordpress into an existing site for a friend and currently have the main blog page appear in a DIV. This is the best way to integrate in this case due to many reasons mostly of way the site is constructed. Code: <div class="scroll-pane" id="scrollbox"> WORDPRESS BLOG </div> My issue is that links within that DIV, in the blog, when clicked redirect the page. The simple answer to this would be to have them just open in a new page, which I can easily do with the below code. Code: function Init()
{
// Grab the appropriate div
theDiv = document.getElementById('scrollbox');
// Grab all of the links inside the div
links = theDiv.getElementsByTagName('a');
// Loop through those links and attach the target attribute
for (var i=0, len=links.length; i < len; i++) {
// the _blank will make the link open in new window
links[i].setAttribute('target', '_blank');
}
}
window.onload = Init;
But what I'd rather it do is have any link clicked inside the DIV to reload in that same DIV, similar to an iframe, but obviously without using an iframe, due to it's compatibility issues. Is this possible by editing the above code? If not what do I need? Thanks in advance for any help! Hello All, I am fairly new to javascript. I need to access a button on a form and perform task using onclick. When I view the source of the page, the id of the button seems to be dynamic with a 'Link' suffix. (ex. xtydLink). How can I access this button if I cannot use getelementbyid because the ID changes? Thanks in advance Hi i have 2 radios : what i need is once i choose the 1st radio i will get 1st DDL with folollwing element : Orange Apple Kiwi if i chose the 2nd radio i should have the 2nd DDL with : Potato Tomato legume ? thanks I was wondering if there was any way I can give a child element, preferably the first one, a link through a parent element with an ID. An example: Code: <div id="parent"> <a href="/">Name</a> <-! start message -> <b>child element text</b> <-! end message -> </div> I want the bold tag to have the link, basically. But through javascript. Hello. My goal is to load the JS for a specific element before displaying that element. I integrated a third part script, and it works well. I set the timer he The JS is in my heading as <script type="text/javascript" src="countdownpro.js"></script> About mid-body I have: <span id="countdown1">2010-07-20 00:00:00 GMT+00:00</span> which allows for the setting of a target date to countdown to. When the page first loads it shows the above long format target time, until the js/meta tags kick in to modify it to just show the actual countdown as 00:00:00. I have attached countdownpro.js to this post. I tried shifting the function CD_Init() to the top of the script, and also appended it inline with the .html. I tried setting the big external script to "defer", but neither arrangement worked. I also tried placing the src file right at the top. I appreciate your help. Hello Basically I have found and adapted the code: Code: alreadyloading = false;
nextpage = 2;
$(window).scroll(function() {
if ($('body').height() <= ($(window).height() + $(window).scrollTop())) {
if (alreadyloading == false) {
var url = "page"+nextpage+".html";
alreadyloading = true;
$.post(url, function(data) {
$('#projectscontainer').children().last().after(data);
alreadyloading = false;
nextpage++;
});
}
}
});
I want when the user scrolls to the bottom of the page for content in a new page to load under the div "#projectscontainer". So in the new page 'Page2.html" I have put 5 divs going down with content in... I want the new content to appear below "#projectscontainer'" Why won't this work? Anyone know? Thanks |
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