If you're using JQuery you can do:
$('#elementid').click();
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Once you have selected an element you can call click()
document.getElementById('link').click();
see: https://developer.mozilla.org/En/DOM/Element.click
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var oElement = document.getElementById('elementId'); // get a reference to your element
oElement.onclick = clickHandler; // assign its click function a function reference
function clickHandler() {
// this function will be called whenever the element is clicked
// and can also be called from the context of other functions
}
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<div id="c" onclick="alert('hello')">Click me!</div>
<div onclick="document.getElementById('c').onclick()">Fake click the previous link!</div>
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val(document.getElementById('elementId').getAttribute('onclick'));
Reference: