I wanted to make a javascript loop in html like the following:
( if (var i=0; i<10; i++) { ) //<-- JAVASCRIPT
//HTML
( } ) //<-- JAVASCRIPT
I tried using the <% JAVASCRIPT %> but it won't work for me. Does anyone know who to solve this?
Thanks in advance.
This is not how javascript works. This is something you would do with PHP.
With javascript, you run it seperately from the html. Then, you create an element within your html as a wrapper to put the javascript generated html into. Like so:
HTML
<div id="myHTMLWrapper">
</div>
<script>
var wrapper = document.getElementById("myHTMLWrapper");
var myHTML = '<span class="test">Testing out my script!</span>';
wrapper.innerHTML = myHTML
</script>
See a working example here
Sorry I skipped over the for loop by the way. Let me fix it with this update... You could do it like this, you see:
<script>
var wrapper = document.getElementById("myHTMLWrapper");
var myHTML = '';
for (var i = 0; i < 10; i++) {
myHTML += '<span class="test">Testing out my script! loop #' + (i + 1) + '</span><br/><br/>';
}
wrapper.innerHTML = myHTML
</script>
for loops are control flow and thus cannot be inserted into a static context. Try mapping it, e.g.
`<html>` + data.map(function(a) { return `<div>${a}</div>` }).join('') + `</html>`
<script>
for(var i=0; i<10; i++) {
//Code here
}
</script>
https://www.w3schools.com/js/js_if_else.asp
https://www.w3schools.com/js/js_loop_for.asp
I'd suggest you read a bit before going straight into coding
Either way your script seems deficient and I cant make out what you are trying to do with it.
Check these links if you want to append elements:
https://www.w3schools.com/jquery/html_append.asp
https://www.w3schools.com/jsref/met_node_appendchild.asp
I apologize in advance, this is the first Stack Overflow question I've posted. I was tasked with creating a new ADA compliant website for my school district's technology helpdesk. I started with minimal knowledge of HTML and have been teaching myself through w3cschools. So here's my ordeal:
I need to create a page for all of our pdf and html guides. I'm trying to create a somewhat interactable menu that is very simple and will populate a link array from an onclick event, but the title="" text attribute drops everything after the first space and I've unsuccessfully tried using a replace() method since it's coming from an array and not static text.
I know I'm probably supposed to use an example, but my work day is coming to a close soon and I wanted to get this posted so I just copied a bit of my actual code.
So here's what's happening, in example 1 of var gmaildocAlt the tooltip will drop everything after Google, but will show the entire string properly with example 2. I was hoping to create a form input for the other helpdesk personnel to add links without knowing how to code, but was unable to resolve the issue of example 1 with a
var fix = gmaildocAlt.replace(/ /g, "&nb sp;")
//minus the space
//this also happens to break the entire function if I set it below the rest of the other variables
I'm sure there are a vast number of things I'm doing wrong, but I would really appreciate the smallest tip to make my tooltip display properly without requiring a replace method.
// GMAIL----------------------------
function gmailArray() {
var gmaildocLink = ['link1', 'link2'];
var gmaildocTitle = ["title1", "title2"];
var gmaildocAlt = ["Google Cheat Sheet For Gmail", "Google 10-Minute Training For Gmail"];
var gmailvidLink = [];
var gmailvidTitle = [];
var gmailvidAlt = [];
if (document.getElementById("gmailList").innerHTML == "") {
for (i = 0; i < gmaildocTitle.length; i++) {
arrayGmail = "" + gmaildocTitle[i] + "" + "<br>";
document.getElementById("gmailList").innerHTML += arrayGmail;
}
for (i = 0; i < gmailvidTitle.length; i++) {
arrayGmail1 = "";
document.getElementById("").innerHTML += arrayGmail1;
}
} else {
document.getElementById("gmailList").innerHTML = "";
}
}
<div class="fixed1">
<p id="gmail" onclick="gmailArray()" class="gl">Gmail</p>
<ul id="gmailList"></ul>
<p id="calendar" onclick="calendarArray()" class="gl">Calendar</p>
<ul id="calendarList"></ul>
</div>
Building HTML manually with strings can cause issues like this. It's better to build them one step at a time, and let the framework handle quoting and special characters - if you're using jQuery, it could be:
var $link = jQuery("<a></a>")
.attr("href", gmaildocLink[i])
.attr("title", gmaildocAlt[i])
.html(gmaildocTitle[i]);
jQuery("#gmailList").append($link).append("<br>");
Without jQuery, something like:
var link = document.createElement("a");
link.setAttribute("href", gmaildocLink[i]);
link.setAttribute("title", gmaildocAlt[i]);
link.innerHTML = gmaildocTitle[i];
document.getElementById("gmailList").innerHTML += link.outerHTML + "<br>";
If it matters to your audience, setAttribute doesn't work in IE7, and you have to access the attributes as properties of the element: link.href = "something";.
If you add ' to either side of the variable strings then it will ensure that the whole value is read as a single string. Initially, it was assuming that the space was exiting the Title attribute.
Hope the below helps!
UPDATE: If you're worried about using apostrophes in the title strings, you can use " by escaping them using a . This forces JS to read it as a character and not as part of the code structure. See the example below.
Thanks for pointing this one out guys! Sloppy code on my part.
// GMAIL----------------------------
function gmailArray() {
var gmaildocLink = ['link1', 'link2'];
var gmaildocTitle = ["title1", "title2"];
var gmaildocAlt = ["Google's Cheat Sheet For Gmail", "Google 10-Minute Training For Gmail"];
var gmailvidLink = [];
var gmailvidTitle = [];
var gmailvidAlt = [];
if (document.getElementById("gmailList").innerHTML == "") {
for (i = 0; i < gmaildocTitle.length; i++) {
var arrayGmail = "" + gmaildocTitle[i] + "" + "<br>";
document.getElementById("gmailList").innerHTML += arrayGmail;
}
for (var i = 0; i < gmailvidTitle.length; i++) {
var arrayGmail1 = "";
document.getElementById("").innerHTML += arrayGmail1;
}
} else {
document.getElementById("gmailList").innerHTML = "";
}
}
<div class="fixed1">
<p id="gmail" onclick="gmailArray()" class="gl">Gmail</p>
<ul id="gmailList"></ul>
<p id="calendar" onclick="calendarArray()" class="gl">Calendar</p>
<ul id="calendarList"></ul>
</div>
MyServlet forwards to Mypage.jsp as
request.getRequestDispatcher("/pages_homepage.jsp?value="+count).forward(request, response);
where count is an integer value generated
Below is my JSP code(Mypage.jsp),
<body onload="getPage('<%request.getParameter("value");%>')">
<div id="app"></div>
</body>
Below is my javascript code,
function getPage(match){
var arr = new Array();
var ele = document.getElementById('app');
for(var i=0;i<match;i++){
var newdiv = document.createElement("label");
newdiv.id = arr[i];
newdiv.value="Page";
ele.appendChild(newdiv);
}
}
What I want is that, I want 'Page' to be displayed 'match' number of times. But I'm not being able to do so by the above code. Their might be something wrong with my js code. Can anyone suggest me any corrections?
Thanks in advance.
LIVE DEMO
Taking in consideration that your page has something like:
<body onload="getPage(5)">
function getPage(n) {
var ele = $('#app');
var labels = ""; // An empty string will be populated with labels elements:
for(var i=0; i<n; i++){
labels += '<label id="'+ i +'"> Page </label>'
}
ele.append( labels ); // append only once outside the loop!
}
The result will be:
<label id="0"></label>
<label id="1"></label>
<label id="2"></label>
<label id="3"></label>
<label id="4"></label>
If you want to start from 1 instead of 0 use:
labels += '<label id="'+ (i+1) +'"> Page </label>'
Note: ID starting with (/ containing only) a number - is only valid in HTML5
Your Code is working and i have tested it
Since you don't have any content in the label tag hence it is not visible in browser
Secondly a small error
in 6th line of js code
newdiv.id = arr[i];
arr[i] is not given any value hence change it with
newdiv.id = i;
enjoy your code
Thanks everyone for their help but I think I got the answer,
Instead of
<body onload="getPage('<%request.getParameter("value");%>')">
I wrote,
<body onload="getPage('<%=Integer.parseInt(request.getParameter("value"))%>')">
But thanks everyone again for their useful pointers.
<html>
<body>
<script type="text/javascript">
var key = [["q","w","e","r","t","y","u","i","o","p"], ["a","s","d","f","g","h","j","k","l"], ["z","x","c","v","b","n","m"]];
</script>
<table>
<tr>
<td><input type = 'button' value = "key[0][1]" /></td>;
</tr>
</table>
</body>
</html>
This is a small example above, but I'm basically making an onscreen keyboard and I already have the loop which positions the buttons, however in my loop I try to assign the value of each key similarly to the code above, but instead of printing q w e r t y for each key, it prints key[row][col] for each button. How do I get the letters to appear on the button using a similar method to the above?
The below code generates the keyboard kind of layout that you are expecting:
<html>
<head>
<script type="text/javascript">
var key = [["q","w","e","r","t","y","u","i","o","p"], ["a","s","d","f","g","h","j","k","l"], ["z","x","c","v","b","n","m"]];
</script>
<body>
<script type="text/javascript">
for(var i = 0; i < key.length; i++)
{
document.write("<div>");
for(var j = 0; j < key[i].length; j++)
{
document.write("<input type='button' value='" + key[i][j] + "'/>");
}
document.write("</div>");
}
</script>
</body>
</html>
The only thing the second and third row should move right a little bit to look like real keyboard. For this we can do padding for the div tags. Hope this helps you.
Something like this?
HTML:
<input id="myInput" type="button" />
JavaScript:
var key = [["q","w","e","r","t","y","u","i","o","p"], ["a","s","d","f","g","h","j","k","l"], ["z","x","c","v","b","n","m"]];
var input = document.getElementById('myInput');
input.value = key[0][1];
That's the basic idea. You already have a loop to work with. The javascript should be after the HTML on the page. Your elements need to exist before you can grab them. Not sure if this is your precise confusion, though.
You can use javascript to create the elements, but unless there's a reason to do so, you might as well write HTML. If you're using a javascript function to generate the elements as well as fill their values in, you'll need javascript's document.createElement:
var keysArr = [["q","w","e","r","t","y","u","i","o","p"], ["a","s","d","f","g","h","j","k","l"], ["z","x","c","v","b","n","m"]];
var generateKeys = function(keys) {
for (var i = 0 ; i < keys.length ; i++) {
for (var j = 0 ; j < keys[i].length ; j++) {
var input = document.createElement('input');
input.value = key[i][j];
document.appendChild(input); // or put it wherever you need to.
}
}
}
generateKeys(keysArr);
Wrapping it in a function will also allow you to re-use the code with different keyboard layouts if you wanted to, say, let the user choose a different layout on the fly.
You will need to set them programmatically, rather than in the value attribute.
You will also need to create the tr/td/input elements within your loop programmatically, for example:
http://www.dustindiaz.com/add-and-remove-html-elements-dynamically-with-javascript/
When you create the input tag programmatically, you can set the value attribute using javascript - eg.
newInput.setAttribute("value", key[rowIndex, cellindex]);
I'm using a Google Apps Script Web App and HtmlService to serve the content and I'm trying to dynamically add input elements to a form with appendChild. It works in Chrome 24 and IE 10, but Firefox 19.0.2 doesn't update the elements listing for the form.
So, it displays correctly on the webpage, but in Firefox, any input elements added with appendChild to the form aren't part of the form.elements collection. It's worth noting this issue only appears when the HTML is sanitized with Caja, if I use the same code in jsfiddle it works fine.
The issue can be seen here, which is just the following code:
<html>
<head>
<title>Test</title>
<script type="text/javascript">
function print(form)
{
var str = "";
for(var v = 0; v < form.length; v++)
{
str += "<br>" + form[v].nodeName + "." + form[v].id + ": ";
if(form[v].elements != undefined)
for(var w = 0; w < form[v].elements.length; w++)
{
str += form[v].elements[w].name + ", ";
}
}
return str;
}
function submitForm()
{
document.getElementById("nameLookupHelp").innerHTML = (print(document.forms)) + "<br>Total Elements:" + document.forms[0].elements.length;
return;
}
function onLoad()
{
var name = document.getElementById("nameForm");
var t = document.createElement("input");
t.name = "TestInput";
//t.id = "TestInput";
name.appendChild(t);
}
</script>
</head>
<body onload="onLoad()">
<form name="nameForm" id="nameForm">
<input name="nameLookup" id="nameLookup">
<input type="button" id="bntNameForm" onclick="submitForm(this)" value="Lookup">
<div class="" id="nameLookupHelp">Please enter your name.</div>
</form>
</body>
</html>
From what I've found on the subject, Firefox doesn't like invalid HTML; however, from what I can tell, the HTML output is perfectly valid. More over, since it works on jsfiddle, I assume the issue has to be with the way Caja is interacting with my HTML and Firefox.
Also, one last thing, if I inspect the form element in Firefox and double click on the form tag in the markup panel, then click off (cancel editing), Firefox then detects all of the elements and everything works fine. What Firefox displays as the HTML doesn't change though.
Thank you in advanced for your help.
Congratulations, you found a bug; a form's .elements never updates after the first time it is accessed. I have fixed it in Caja r5321.