JavaScript avoids multiple submissions and saves of forms

Friends who have used forms to submit data and save it should have encountered multiple submission forms that refresh once and submit once. This article introduces a method to avoid the form being submitted and saved multiple times.

1. javascript, set up a Variables are only allowed to be submitted once.

method="post" onsubmit="return checkSubmit();">

2. javascript, will Set the submit button or image to disable

method="post"
　onsubmit="getElById('submitInput')
.disabled = true;
return true;
"> ;
　
　　styleId="submitInput"
　src="images/ok_b.gif"
　border="0" />
　
　

After using the above method, You will find that after you submit the form, you will refresh it multiple times. There is only one entry in the database and it will not be saved multiple times.

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