getelementsbyname | 易学教程

Javascript: setAttribute() v.s. element.attribute = value to set “name” attribute

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问题 So I'm learning to manipulate the DOM and I noticed one interesting thing: Let's say I want to set the name attribute of an element by using the "." dot notation: element.name = "someName"; console.log(document.getElementsByName("someName")[0]); // returns "undefined"?? However if I use the document.setAttribute() method, it works fine: element.setAttribute("name", "someName"); console.log(document.getElementsByName("someName")[0]); // returns the element like it should. Not sure why the dot

getElementsByName() not working?

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I have a Javascript function which should update a hidden input field in my form with a number that increments every time the function is called. It worked originally with getElementById() however because I had to redesign my form I cannot use the php function to assign an individual ID to the element so all I have is a unique name for that element. So instead I decided to use getElementsByName() from Javascript to modify the element. Here is the HTML of that element <input type="hidden" value="" name="staff_counter"> This is my Javascript code: window.onload=function() { //function is

Get attribute by name

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问题 I have a struct definition with about 25 elements struct X { field 1; field 2; .. }; and I\'m trying to fill it with some map values Map<String,String> A and it appears to be very annoying to do such thing n times X->xx = A[\"aaa\"] every time that I want to fill my message struct. Is it possible to access the members by name, e.g. X->get_instance_of(\"xx\").set(A[\"aaa\"]); and put it into a loop? 回答1: C++ lacks built-in reflection capabilities of more dynamic languages, so you cannot do

getElementsByName() not working?

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问题 I have a Javascript function which should update a hidden input field in my form with a number that increments every time the function is called. It worked originally with getElementById() however because I had to redesign my form I cannot use the php function to assign an individual ID to the element so all I have is a unique name for that element. So instead I decided to use getElementsByName() from Javascript to modify the element. Here is the HTML of that element <input type=\"hidden\"