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Js click the text box to pop up the selectable checkbox check box,

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Js click the text box to pop up the selectable checkbox check box,

This article shares a code example. When you click the text box, the checkbox check box in the drop-down box is displayed. You can select the check box to write the value to the text box, it may not be so straightforward and simple in practical application, but it can be demonstrated as an example to facilitate the learner's understanding and expansion.
The Code is as follows:

<Html> 

The above Code meets our requirements. Next we will introduce its implementation process.
Code comment:
1. $ (function (){}),After the document structure is fully loaded, execute the code in the function.
2. var position = $ ("# xx"). offset (),Get the offset of the text box relative to the document. The offset () function returns an object that contains the left and top attributes, indicating the horizontal and vertical offset relative to the document, respectively.
3. $ ("# div1"). offset ({top: position. top + 22, left: position. left }),Set the Relative document offset of the pop-up drop-down menu container. The first plus 22 is used to display it under the text box.
4. $ ("# xx"). click (function () {$ ("# NG"). toggleClass ("open ");}),Register the click event handler for the text box. click it to switch to the style class open Delete and add, that is, set the display and hide of the drop-down menu.
5. $ ("# div1 input [name = ng]"). click (function (){}),Register the click event handler function for the text box whose value is ng.
6. var arr = new Array (),Create an array to store the value of the checkbox check box.
7. $ ("input [name = ng]: checked "). each (function (key, value) {arr [key] = $ (value ). val ();}),Store the value of the selected check box to an array.
8. $ ("# xx"). val (arr. join (","));,Concatenates array elements into strings and writes them into the text box.


I hope this article will help you learn about javascript programming.

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