I am writing a JavaScript function that when the user clicks a link from one page, it goes to this page. When the page loads, it should open up a popup box. The problem is I don't know how to tell it in the function to open up onload if the user is coming from a certain link. Otherwise the page should act normal without a popup onload.
window.onload = function() {
var opened = window.open('', 'height = 500, width = 500');
opened.document.write('Open');
}
You can add a hash fragment, then check for that hash fragment in the url. If it is there call the function. :)
<a href="your_page.html#dothething">Click me</a>
window.onload = function() {
if (window.location.hash === "#dothething") {
//Call your functions
}
}
When you redirect your user you should add a QueryString parameter, in the onload of your 2nd page you can then test on this QueryString.
var url = "http://google.com?parameter1=value1¶meter2=value2";
window.open(url, 'height = 500, width = 500');
Building on what Hatsjoem answered first you would put the variable in the request coming from the link. Like so : http://www.Blah.com/NeatoPage.aspx?YourVariable=X.
Then in the Page_Load code behind of the popup page check the value of the querystring variable.
Request.QueryString["YourVariable"].toString() or Request.QueryString["YourVariable"] != null
Put the result in a hiddenfield or something.
Then just have your javascript check the hiddenfield for decision making.
document.getElementById("hdnVariable").value
Make sense?
You can use document.referrer http://www.w3schools.com/jsref/prop_doc_referrer.asp.
window.onload = function() {
if(document.referrer.indexOf("keySubstringOfReferrerUrl")!== -1){
/*Do something*/
}else{
/*Do the other thing*/
}
}
This works with normal links (anchor tags with href). If you did the links with javascript you may need to use this function in order to work with older versions of IE:
function navigateWithReferrer(url) {
var fakeLink = document.createElement("a");
if (document.createEvent) {
location.href = url
} else {
fakeLink.href = url;
document.body.appendChild(fakeLink);
fakeLink.click()
}
}
