Add my own window.onload safely without overwriting old ones
Posted on In QAMy webpage has one existing window.onload javascript function defined by a javascript plugin in the <head> section. Now, I defined a new one and add it to the end of the HTML page:
<script type="text/javascript">
window.onload = function () {
// great work here
}
</script>
I find the new one overwrites the old one in the plugin and the old one is not executed at all.
How to add my onw window.onload functions without overwriting old ones?
I find this little trick by rewriting the javascript as follows:
<script type="text/javascript">
var oldOnload = window.onload;
window.onload = function () {
if (typeof oldOnload == 'function') {
oldOnload();
}
// great work here
}
</script>
