InnerHTML is not standard, and its a String. The DOM is not, and although innerHTML is faster and less verbose, its better to use the DOM methods like appendChild(), firstChild.nodeValue, etc to alter innerHTML content.
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Number, String, Undefined, null, Boolean
document.getElementById(“myText”).style.fontSize = “20″;
-or- document.getElementById(“myText”).className = “anyclass”; undefined means a variable has been declared but has not yet been assigned a value. On the other hand, null is an assignment value. It can be assigned to a variable as a representation of no value.
Also, undefined and null are two distinct types: undefined is a type itself (undefined) while null is an object. Unassigned variables are initialized by JavaScript with a default value of undefined. JavaScript never sets a value to null. That must be done programmatically. Since 1 is a string, everything is a string, so the First one result is 124.
In the second case, its 93. The == checks for value equality, but === checks for both type and value.
The onload event does not fire until every last piece of the page is loaded, this includes css and images, which means there’s a huge delay before any code is executed.
That isnt what we want. We just want to wait until the DOM is loaded and is able to be manipulated. onDocumentReady allows the programmer to do that. document.getElementById(id).options.length = 0;
(or) document.forms[FormName].elements[SelectName].options.length = 0; FormName :- Name of the Form SelectName:- Name of the Select Box var t=setTimeout("javascript statement",milliseconds);
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