This is a javascript function
<script>
function func1(var g){
alert(document.getElementsByTagName('p')[0].innerHTML);
}
</script>
how to pass value 0 from function call to function definition above.
<p onmouseover="func1(0)";>First para</p>
2 Answers
Change it to
<script>
function func1(g){
alert(document.getElementsByTagName('p')[0].innerHTML);
}
</script>
You need to see console log for relevant errors that pop up.
In this case you are declaring variable in function arguments which is not allowed, you can find out more about function here.
4 Comments
Andy
The question remains - why pass in that parameter if it's not going to be used unless
g is meant to replace the index.
Rayon
Though it will work for sure.. You must have valid description which will make OP understand things! Change it/Try this will not help the cause...
Andy
No - he's clearly targeting the "First para" which is index 0.
Jagdish Idhate
We can create lots of use cases, OP should answer that.
Since you're using [0] to target the first paragraph when you mouseover it your function should be;
function func1(g){
alert(document.getElementsByTagName('p')[g].innerHTML);
}
A more canonical JS approach is to attach an event listener to your elements with JavaScript instead of inlining the code:
var paras = document.getElementsByTagName('p');
[].slice.call(paras).forEach(function (el, i) {
el.addEventListener('mouseover', func1.bind(func1, i), false);
});
function func1(g){
console.log(paras[g].innerHTML);
}
But perhaps the best way is to use event delegation so that you're not adding listeners to all the elements. Add an event listener to a parent element and catch the events from the paras as they bubble up the DOM:
var div = document.getElementById('paras');
div.addEventListener('mouseover', func1, false);
function func1(e) {
var el = e.target;
if (el.nodeType === 1 && el.nodeName === 'P') {
console.log(el.innerHTML);
}
}
varkeyword in the formal parameter list. Keep your browser's developer console open so that you can see error messages.gmeant to be doing in that function? At the moment it seems irrelevant.