JS implements a simple shopping cart with pictures and code
As shown in the picture:
The implementation of the select all button is:
<input type="checkbox" name="all" onclick="checkAll()" />全选<br /> <input type="checkbox" name="item" value="3000" />笔记本电脑：3000元<br /> <input type="checkbox" name="item" value="3000" />笔记本电脑：3000元<br /> <input type="checkbox" name="item" value="3000" />笔记本电脑：3000元<br /> <input type="checkbox" name="item" value="3000" />笔记本电脑：3000元<br /> <input type="checkbox" name="item" value="3000" />笔记本电脑：3000元<br /> <input type="checkbox" name="item" value="3000" />笔记本电脑：3000元<br /> <input type="checkbox" name="item" value="3000" />笔记本电脑：3000元<br /> <input type="checkbox" name="item" value="3000" />笔记本电脑：3000元<br /> <input type="checkbox" name="item" value="3000" />笔记本电脑：3000元<br /> <input type="checkbox" name="item" value="3000" />笔记本电脑：3000元<br /> <input type="checkbox" name="all" onclick="checkAll()" />全选<br /> <input type="button" value="获取总金额" onclick="getSum()" /> <span id="sum"></span>
The last span tag is used to store the area that displays the total amount.
The code to implement the two "select all" functions is:
function checkAll()
{
//var allNode = document.getElementsByName("all")[0];
//获取被点击的元素
var allNode = event.srcElement;
var item = document.getElementsByName("item");
for(var x=0;x<item.length;x++)
{
item[x].checked = allNode.checked;
}
}event.srcElement implements the acquisition of the response event button.
The for loop modifies the checked attribute of each multi-select box.
The method for calculating the total amount is:
function getSum()
{
var item = document.getElementsByName("item");
var sum = 0;
for(var x=0;x<item.length;x++)
{
if(item[x].checked)
{
sum+=parseInt(item[x].value);
}
}
var spanNode = document.getElementById("sum");
spanNode.innerHTML = (sum+"元").fontsize(7);
}Add the values of all selected check boxes.
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