Can I create a javascript variable and increment that variable when I press a button (not submit the form). Thanks!
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javascript
Use type = "button" instead of "submit", then add an onClick handler for it.
For example:
<input type="button" value="Increment" onClick="myVar++;" />
I believe you need something similar to the following:
<script type="text/javascript">
var count;
function increment(){
count++;
}
</script>
...
and
<input type="button" onClick="increment()" value="Increment"/>
or
<input type="button" onClick="count++" value="Increment"/>
I needed to see the results of this script and was able to do so by incorporating the below:
var i=0;
function increase()
{
i++;
document.getElementById('boldstuff').innerHTML= +i;
}
<p>var = <b id="boldstuff">0</b></p>
<input type="button" onclick="increase();">
add the "script" tag above all and a closing script tag below the function end curly brace. Returning false caused firefox to hang when I tried it. All other solutions didn't show the result of the increment, in my experience.
Had a similar problem. Needed to append as many text inputs as the user wanted, to a form. The functionality of it using jQuery was the answer to the question:
<div id='inputdiv'>
<button id='mybutton'>add an input</button>
</div>
<script>
var thecounter=0; //declare and initialize the counter outside of the function
$('#mybutton').on('click', function(){
thecounter++;
$('#inputdiv').append('<input id="input'+thecounter+'" type="text/>);
});
</script>
Adding the count to each new input id resulted in unique ids which lets you get all the values using the jQuery serialize() function.
yes, supposing your variable is in the global namespace:
<button onclick="myVar += 1;alert('myVar now equals ' + myVar)">Increment!!</button>
The purist way to do this would be to add event handlers to the button, instead of mixing behavior with the content (LSM, Layered Semantic Markup)
<input type="button" value="Increment" id="increment"/>
<script type="text/javascript">
var count = 0;
// JQuery way
$('#increment').click(function (e) {
e.preventDefault();
count++;
});
// YUI way
YAHOO.util.Event.on('increment', 'click', function (e) {
YAHOO.util.Event.preventDefault(e);
count++;
});
// Simple way
document.getElementById('increment').onclick = function (e) {
count++;
if (e.preventDefault) {
e.preventDefault();
}
e.returnValue = false;
};
</script>
<script type="text/javascript">
var i=0;
function increase()
{
i++;
return false;
}</script><input type="button" onclick="increase();">
Yes.
<head>
<script type='javascript'>
var x = 0;
</script>
</head>
<body>
<input type='button' onclick='x++;'/>
</body>
[Psuedo code, god I hope this is right.]
Source: Stackoverflow.com