Exploring the nuances of various browsers in JavaScript

I am facing an issue where my JavaScript code functions correctly in Internet Explorer, but not in Firefox or Safari. I have a loop that goes through each element and, depending on the variable inside a text box, triggers an alert message. The code snippet is as follows:

Here is an example of a text box: 

<asp:TextBox ID="txtMac" runat="server" req="yes" errMessage="Mac"/>

for (a = 0; a < theForm.elements.length; a++) {
  if (theForm.elements[a].type == "text" && theForm.elements[a].req == "yes") {
    alert("Made it here")
  }
}
javascriptasp.netvb.net

Answer №1

For retrieving custom attributes, it is recommended to utilize the getAttribute method. You can refer to this example at http://jsfiddle.net/8EWQr/.

Instead of checking for

(theForm.elements[a].type == "text" && theForm.elements[a].req == "yes")

You should check by using

(theForm.elements[a].getAttribute('type') == "text" && theForm.elements[a].getAttribute('req') == "yes")

Answer №2

Unfamiliar with asp tags, I believe "req" is an attribute so this snippet will alert only if the attributes match your requirements. Utilizing a shortcut array for holding elements found by tag name, following James' advice for better cross-browser compatibility.


var a = [];
a = document.getElementsByTagName("input");
for(var i=0; i < a.length; i++){

if (theForm.elements[i].getAttribute('type') == "text" && theForm.elements[i].getAttribute('req') == "yes"){
alert("Reached this point with" + theForm.elements[i]);
}
}

Answer №3

Consider utilizing document.getElementsByTagName for a browser-compatible solution.

var hyperlinks = document.getElementsByTagName("a");

Answer №5

It is recommended to utilize 

var theForm = getElementById("theForm")
instead of directly calling theForm. The elements ids are only added to the javascript global scope by Chrome and IE.

Additionally, it is preferable to use getAttribute() when retrieving the value of an attribute as this shortcut is only available in IE.

Feel free to test out this example.

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