Wie es ohne Inline-JavaScript geht
Es wird allgemein empfohlen, Inline-JavaScript zu vermeiden, aber es gibt selten ein Beispiel dafür.
Hier ist meine Art, Ereignisse an Schaltflächen anzuhängen.
Ich bin nicht ganz zufrieden damit, wie lange die empfohlene Methode mit einer einfachen Methode verglichen wirdonClick Attribut wird.
Nur Browser 2014
<button class="btn">Button</button>
<script>
let OnEvent = (doc) => {
return {
on: (event, className, callback) => {
doc.addEventListener('click', (event)=>{
if(!event.target.classList.contains(className)) return;
callback.call(event.target, event);
}, false);
}
}
};
OnEvent(document).on('click', 'btn', function (e) {
window.console.log(this, e);
});
</script>
Nur 2013 Browser
<!DOCTYPE html>
<html>
<head>
<script>
(function(doc){
var hasClass = function(el,className) {
return el.classList.contains(className);
}
doc.addEventListener('click', function(e){
if(hasClass(e.target, 'click-me')){
e.preventDefault();
doSomething.call(e.target, e);
}
});
})(document);
function insertHTML(str){
var s = document.getElementsByTagName('script'), lastScript = s[s.length-1];
lastScript.insertAdjacentHTML("beforebegin", str);
}
function doSomething(event){
console.log(this.id); // this will be the clicked element
}
</script>
<!--... other head stuff ...-->
</head>
<body>
<!--Best if you inject the button element with javascript if you plan to support users with javascript disabled-->
<script>
insertHTML('<button class="click-me" id="btn1">Button 1</button>');
</script>
<!--Use this when you don't care about broken buttons when javascript is disabled.-->
<!--buttons can be used outside of forms https://stackoverflow.com/a/14461672/175071 -->
<button class="click-me" id="btn2">Button 2</button>
<input class="click-me" type="button" value="Button 3" id="btn3">
<!--Use this when you want to lead the user somewhere when javascript is disabled-->
<a class="click-me" href="/path/to/non-js/action" id="btn4">Button 4</a>
</body>
</html>
Browserübergreifend
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
(function(doc){
var cb_addEventListener = function(obj, evt, fnc) {
// W3C model
if (obj.addEventListener) {
obj.addEventListener(evt, fnc, false);
return true;
}
// Microsoft model
else if (obj.attachEvent) {
return obj.attachEvent('on' + evt, fnc);
}
// Browser don't support W3C or MSFT model, go on with traditional
else {
evt = 'on'+evt;
if(typeof obj[evt] === 'function'){
// Object already has a function on traditional
// Let's wrap it with our own function inside another function
fnc = (function(f1,f2){
return function(){
f1.apply(this,arguments);
f2.apply(this,arguments);
}
})(obj[evt], fnc);
}
obj[evt] = fnc;
return true;
}
return false;
};
var hasClass = function(el,className) {
return (' ' + el.className + ' ').indexOf(' ' + className + ' ') > -1;
}
cb_addEventListener(doc, 'click', function(e){
if(hasClass(e.target, 'click-me')){
e.preventDefault ? e.preventDefault() : e.returnValue = false;
doSomething.call(e.target, e);
}
});
})(document);
function insertHTML(str){
var s = document.getElementsByTagName('script'), lastScript = s[s.length-1];
lastScript.insertAdjacentHTML("beforebegin", str);
}
function doSomething(event){
console.log(this.id); // this will be the clicked element
}
</script>
<!--... other head stuff ...-->
</head>
<body>
<!--Best if you inject the button element with javascript if you plan to support users with javascript disabled-->
<script type="text/javascript">
insertHTML('<button class="click-me" id="btn1">Button 1</button>');
</script>
<!--Use this when you don't care about broken buttons when javascript is disabled.-->
<!--buttons can be used outside of forms https://stackoverflow.com/a/14461672/175071 -->
<button class="click-me" id="btn2">Button 2</button>
<input class="click-me" type="button" value="Button 3" id="btn3">
<!--Use this when you want to lead the user somewhere when javascript is disabled-->
<a class="click-me" href="/path/to/non-js/action" id="btn4">Button 4</a>
</body>
</html>
Browserübergreifend mit jQuery
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
(function($){
$(document).on('click', '.click-me', function(e){
doSomething.call(this, e);
});
})(jQuery);
function insertHTML(str){
var s = document.getElementsByTagName('script'), lastScript = s[s.length-1];
lastScript.insertAdjacentHTML("beforebegin", str);
}
function doSomething(event){
console.log(this.id); // this will be the clicked element
}
</script>
<!--... other head stuff ...-->
</head>
<body>
<!--Best if you inject the button element with javascript if you plan to support users with javascript disabled-->
<script type="text/javascript">
insertHTML('<button class="click-me" id="btn1">Button 1</button>');
</script>
<!--Use this when you don't care about broken buttons when javascript is disabled.-->
<!--buttons can be used outside of forms https://stackoverflow.com/a/14461672/175071 -->
<button class="click-me" id="btn2">Button 2</button>
<input class="click-me" type="button" value="Button 3" id="btn3">
<!--Use this when you want to lead the user somewhere when javascript is disabled-->
<a class="click-me" href="/path/to/non-js/action" id="btn4">Button 4</a>
</body>
</html>
Sie können dies ausführen, bevor das Dokument fertig ist. Wenn Sie auf die Schaltflächen klicken, funktioniert dies, da das Ereignis an das Dokument angehängt wird.
Hier ist eine jsfiddle
Aus irgendeinem seltsamen Grund dieinsertHTML funktioniert Funktion nicht, obwohl sie in allen meinen Browsern funktioniert.
Sie können immer ersetzen insertHTMLmit , document.writewenn Sie nichts dagegen ist es nicht Nachteile
<script>
document.write('<button class="click-me" id="btn1">Button 1</button>');
</script>
Quellen: