Objective Crip all-Selected Learning notes

Last Update:2017-01-13 Source: Internet

Author: User

Tags php tutorial

Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

Document. getElementById ('') is the id feature of an element to obtain a specified element. An object is returned. Document. getElementById ('') obtains the control object based on the control TAG (type attribute) and returns an array of objects;

To achieve a full-selection effect, you must define a set of options first.

The code is as follows:	Copy code
<Body> <P id = "btn"> <input id = "hk" type = "checkbox"/> select all </p> <Input type = "checkbox"/> <br/> <Input type = "checkbox"/> <br/> <Input type = "checkbox"/> <br/> <Input type = "checkbox"/> <br/> <Input type = "checkbox"/> <br/> <Input type = "checkbox"/> <br/> <Input type = "checkbox"/> <br/> </Body>

Next, use Javascript to achieve the effect. The effect in the tutorial is that you can only select all selected items when you click all. If you click all selected items, you cannot select all items. Here, I have added this function through my understanding.

The code is as follows:

Copy code

<Script type = "text/javascript">
Window. onload = function (){

Var oInput = document. getElementsByTagName ('input ')
Var ohk = document. getElementById ('HK ')
Ohk. onclick = function (){
Var I = 0;
If (ohk. checked = true ){
For (I = 0; I <oInput. length; I ++)
         {
OInput [I]. checked = true;
             }
         }
Else
         {
For (I = 0; I <oInput. length; I ++)
         {
OInput [I]. checked = false;

         }

         }
};
};
</Script>

I personally feel that this method is still lacking. He will select all the types on the page as input. Now we have written a click event to select all.

The code is as follows:

Copy code

<Meta charset = "utf-8">
<Script language = "javascript">
Function selectAll ()
{
Obj = document. getElementsByName ('range ');
For (var I = 0; I <obj. length; I ++)
{
// Document. form1.range [I]. checked = true;
Obj. item (I). checked = true;

}
}
Function unSelect ()
{
Obj = document. getElementsByName ('range ');
For (var I = 0; I <obj. length; I ++)
{
If (obj. item (I). checked)
{
Obj. item (I). checked = false;
}
Else
{
Obj. item (I). checked = true;
}
}
}
</Script>
<Form name = "form1">
<Input type = "checkbox" value = "1" name = "range"> 1 <br>

<! --
<Input type = "checkbox" value = "3" name = "range"> 3 <br>
<Input type = "checkbox" value = "4" name = "range"> 4 <br>
<Input type = "checkbox" value = "5" name = "range"> 5 <br> -->
<Input type = "button" value = "select all" onclick = "selectAll ();">
<Input type = "button" value = "invert" onclick = "unSelect ();">
</Form>

In this way, if the deletion function is also implemented in combination with the php program, we only need to provide the obtained string in post or get mode. The following describes how to provide the get method.

The code is as follows:

Copy code

// Batch delete
// Na is name
Function checkSubmit (na, url)
{

Var str = '';
For (var I = 0; I <document. getElementsByName (na). length; I ++)
    {
If (document. getElementsByName (na) [I]. checked ){
If (str = '') str + = document. getElementsByName (na) [I]. value;
Else str + = ',' + document. getElementsByName (na) [I]. value;
          }
    }
If (str = '')
    {
Alert ('you didn't select any content! ');
Return false;
    }
Else
    {
Location = url + "? Id = "+ str +" & action = delall ";
    }
}

In the php program

The code is as follows:	Copy code
$ A = $ _ GET ['id'];

Then, you can use where id in ($ a) to delete it. This is also a simple php Tutorial. If you need it, you can learn and communicate with others.

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

Sales Support

1 on 1 presale consultation

Chat Contact Sales
After-Sales Support

24/7 Technical Support 6 Free Tickets per Quarter Faster Response

Open a Ticket
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

Learn More