The activeElement returns the currently focused element in the document. The following example demonstrates how you can use the activeElement property to check if the element with class name .name has focus: const elem = document.querySelector('.name'); if (elem === document.activeElement...
}// create the new html list itemvarnode =document.createElement("li");varlabel = coffee.name+' '+ size;vartextnode =document.createTextNode(label+' price: $'+price); node.appendChild(textnode);document.getElementById('products').appendChild(node); }// now all we need to do is call...
window.onload = function() { // Look up a element let form = document.querySelector("form#shipping"); // Register an event handler function on the form that will be invoked // before the form is submitted. Assume isFormValid() is defined elsewhere. form.onsubmit = function(event) {...
constcastArray=val=>(Array.isArray(val)?val:[val]);castArray('foo');// ['foo']castArray([1]);// [1]castArray(1);// [1] 10. `compact`:去除数组中的无效/无用值 代码语言:javascript 复制 constcompact=arr=>arr.filter(Boolean);compact([0,1,false,2,'',3,'a','e'*23,NaN,'s...
const focused = document.hasFocus(); 示例:检测页面是否获得焦点 functioncheckPageFocus() { const info= document.getElementById('message');if(document.hasFocus()) { info.innerHTML= '该页面获得了焦点'; }else{ info.innerHTML= '该页面没有获得焦点'; ...
activeElement Returns the currently focused element in the document Document addEventListener() Attaches an event handler to the document Document, Element adoptNode() Adopts a node from another document Document alert() Displays an alert box with a message and an OK button Window altKey Returns whet...
First things first. You canât get very far with JavaScript if you donât know how to get it into a page. So, how do you do that? Using theelement of course! Letâs take a boring old, garden-variety web page and add some dynamic behavior using aelement. ...
Before, for some common style settings of the same child element of multiple different parent containers, the following CSS code may appear: header p:hover, main p:hover, footer p:hover { color: red; cursor: pointer; } And now with the:is()pseudo-class, the above code can be rewritten...
Configuration element is not declared Confirm Message Box with OK or Cancel option in C# confirmation alert box in c# on condition check Content controls have to be top-level controls in a content page or a nested master page that references a master page Content pages not Showing MasterPage ...
Make focus re-triggering not focus the original element back (#4382, dbcffb39) Don’t crash if an element is removed on blur (#4417, 5c2d0870) Remove the event.which shim (#3235, 1a5fff4c) remove jQuery.event.global (18db8717) Only attach events to objects that accept data – for ...