I am encountering an issue with attaching a click event to a button with the class "nextPage". I have provided the code below for reference.
function myContent() {
}
myContent.prototype.clickNext = function() {
alert("clicked");
};
var objMyContent = new myContent();
var el = document.getElementsByClassName('nextPage');
el.onclick=objMyContent.clickNext();
Your insights on where I may have gone wrong would be greatly appreciated. Thank you.
When setting a click handler, it's important to reference the function rather than execute it.
Instead of:
el.onclick = objMyContent.clickNext();
Use this:
el.onclick = objMyContent.clickNext;
The first example executes the clickNext function and assigns its return value to el.onclick.
The second method assigns a reference to the clickNext function to el.onclick, which is the correct approach.
Additionally, keep in mind that getElementsByClassName returns an HTMLCollection, which is essentially an array of HTML elements.
You will need to assign the click handler to each element within that collection:
for(var i = 0; i < el.length; i++){
el[i].onclick = objMyContent.clickNext;
}
Loop through the array and set up the click event
let myData = new Data();
let elements = document.querySelectorAll('.nextPage'); for(let i=0;i<elements.length;i++) elements[i].onclick=myData.handleClick;
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