Passing variables in nested functions between scripts
Question
I am a newbie to jQuery and am trying to make a variable within a nested function available between scripts. However, I am unsure of how to do so (I am pretty bad at understanding scope). Here is the code (note: I copy-pasted this from jsFiddle, hence some tags are purposefully missing).
<body>
<h1>Hello</h1>
<button id="btn">click</button>
<script>
var x;
$(document).ready(function() {
$(document).on("click", "#btn", function() {
x = "hello world";
});
});
</script>
<script>
alert(x);
</script>
</body>
Any help is appreciated!
2 answers
solution1
1 2013-09-05 15:54:56
for that alert to alert Hello World you need to add it inside the click function... since x is redeclare inside the click event . and you don't have to seperate your <script> .
<script>
var x;
$(document).ready(function() {
$(document).on("click", "#btn", function() {
x = "hello world";
alert(x); //alerts hello world
});
alert(x); //alerts undefined since x is not set as this is executed before the click event as soon as document is ready
});
alert(x); //alerts undefined since x is not set
</script>
solution2
1 2013-09-05 15:57:21
You are doing correctly, in your code <script> alert(x);</script> when you are using alert x value is not set.
HTML:
<button id="set">set</button>
<button id="get">get</button>
JS:
var x;
$(document).ready(function () {
$(document).on("click", "#set", function () {
x = "hello world";
});
$(document).on("click", "#get", function () {
alert(x);
});
});
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