How to read line by line of a text area HTML tag

Question

I have a text area where each line contains Integer value like follows        1234       4321      123445   I want to check if the user has really enetered valid values and not some funny values like follows        1234        987l    For that I need to read line by line of text area and validate that  How can i read line by line of a text area using javascript

User · Answer

This would give you all valid numeric values in lines  You can change the loop to validate  strip out invalid characters  etc - whichever you want   var lines           my textarea selector   val   split   n   each function          if  parseInt   this      NaN           lines     parseInt   this

User · Answer

This works without needing jQuery   var textArea   document getElementById  my-text-area    var arrayOfLines   textArea value split   n       arrayOfLines is array where every element is string of one line

User · Answer

Try this   var lines      textarea   val   split   n    for var i   0 i  lt  lines length i           code here using lines i  which will give you each line

User · Answer

Two options  no JQuery required  or JQuery version  No JQuery  or anything else required   var textArea   document getElementById  myTextAreaId    var lines   textArea value split   n          lines is an array of strings     Loop through all lines for  var j   0  j  lt  lines length  j        console log  Line     j     is     lines j       JQuery version  var lines       myTextAreaId   val   split   n         lines is an array of strings     Loop through all lines for  var j   0  j  lt  lines length  j        console log  Line     j     is     lines j         Side note  if you prefer forEach a sample loop is  lines forEach function line      console log  Line is     line

User · Answer

A simple regex should be efficent to check your textarea     s  d  s  n g test text     OK     KO

[javascript] How to read line by line of a text area HTML tag

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